oubleshooting Guide diesel - gasoline - LPG electric P.O. Box 1160 St. Joseph, MO Fax:

Transcription

1 Troub oubleshooting Guide diesel - gasoline - LPG electric P/N October 2005 P.O. Box 1160 St. Joseph, MO Fax:

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3 GENERAL INFORMATION This manual contains procedures for locating and correcting the majority of problems which may develop on the Snorkelift ATB 46n and ATB 46e Aerial Platforms. Since the majority of malfunctions experienced on equipment in the aerial platform industry are associated with the hydraulic and electrical systems, great effort has been made to develop a guide which insures that procedures regarding these areas are given the fullest possible attention and detail. As a result of these efforts, the aerial platform has been divided into thirteen distinct groups (46n) and eleven groups (46e) with each group covered by an individual section. The Sections are as follows: PART 1 ATB 46n 1.) Engine Diagnostics 8.) Platform Leveling System Diagnostics 2.) Hydraulic Diagnostics 9.) Boom Elevation System Diagnostics 3.) Steering System Diagnostics 10.)Telescope System Diagnostics 4.) Drive System Diagnostics 11.) Fuel System Diagnostics 5.) Emergency Power System Diagnostics 12.) Accessories Diagnostics 6.) Swing System Diagnostics 13.) Pins and Functions List 7.) Platform Rotation System Diagnostics PART 2 ATB 46e 1.) System Required: Error Codes 7.) Platform Rotation System Diagnostics 2.) Hydraulic Diagnostics 8.) Platform Leveling System Diagnostics 3.) Steering System Diagnostics 9.) Boom Elevation System Diagnostics 4.) Drive System Diagnostics 10.) Telescope System Diagnostics 5.) Emergency Power System Diagnostics 11.) Pins and Functions List 6.) Swing System Diagnostics NOTES, CAUTIONS AND DANGERS The terms NOTE, CAUTION, and DANGER appear throughout this manual and have specific meanings. A NOTE provides additional or special information to make a step or procedure easier or clearer. Disregarding a NOTE might cause inconvenience, but would not cause equipment damage or personal injury. A is provided in a procedure wherever minor personal injury or equipment damage could result. Disregarding a CAUTION could cause damage to the machine; however serious personal injury is unlikely. is the most serious and emphasizes areas where personnel injury and even death could result from negligence. Permanent mechanical damage is also highly probable. DANGER signs are to be taken seriously. In some cases, serious injury or death has resulted from disregarding a DANGER. NOTE: Engine maintenance and troubleshooting information not contained in this manual may be found in the engine maintenance manual originally provided with the machine, or from the Engine Manufacture/Dealer Network. It should be recognized that every person who performs testing and diagnostic procedures and every person supervising any of these functions must be properly trained and qualified. If a problem should occur which is not covered by this manual or which cannot be corrected using the listed corrective actions, technically qualified guidance from the Service Department of Snorkel International Inc., should be obtained prior to proceeding further. Tel: (816) NOTE: Diagnostic procedures basically consist of a logical process of elimination. For this reason, it is very important that the steps be performed in the order in which they are presented. Always begin by localizing the problem and defining the symptoms as accurately as possible. When the problem has been localized, make sure to completely read and comprehend the appropriate flow chart. Do not attempt to make shortcuts. Troubleshooting Guide 1 ATB 46n/46e

4 MANUAL DESIGN Each symptom described is followed by a list of inspections to be performed. Each inspection is in the form of a flowchart. A set of detailed checks are then performed at the component and/or related areas which confirm or decline the outcome. If the inspection is declined the flowchart will refer to the next step to be performed until the problem is confirmed. The diagnosis then enables a determination of the appropriate action or remedy. Example: Problem Solving Procedure Problem Step 2 OK Example: Flowchart Procedure If Troubleshoot (Identify Problem) Yes Go to step no Replace or perform repair EQUIPMENT NEEDED: Multimeter: A meter designed to read voltage, amperage and resistance. Pressure Test Gauge: A pressure gauge rated for psi. A pressure gauge rated for psi. Tachometer: A meter designed to measure engine RPM on gas and/or diesel. (Photo Tachometer is recommended) Flowmeter: A meter designed to measure fluid flow. Stopwatch: A tool designed to measure time. Troubleshooting Guide 2 ATB 46n/46e

5 Part 1 ATB 46n SYMPTOM PAGE NUMBER Section One - Engine Diagnostics Engine starter fails to operate (No Electrical) 13 Starter disengages before engine starts 13 Engine starts then shuts down after 30 seconds 14 Engine cranks over but will not start 14 Engine will not accelerate 15 Engine will not start from platform control, but will start from ground control 15 Engine starts while cranking, then dies when key switch is released 14 Section Two - Hydraulic Diagnostics Hydraulic system functions on emergency power only 35 Hydraulic pump stays on stroke 35 Hydraulic functions are sluggish 35 Hydraulic pump will not build enough pressure 35 Flow from hydraulic pump is too low (slow functions) 36 Flow from hydraulic pump is too high (kills engine) 36 Section Three - Steering System Diagnostics Machine will not steer 45 Section Four - Drive System Diagnostics Drive system is non-operational with controller in either direction 51 No forward (reverse ok) 52 No reverse (forward ok) 52 Drive high range not operating 52 Machine drives at full speed with platform raised and/or extended 53 Brakes will not release 53 Only one wheel turns ro one wheel turns faster than other (2 wheel drive) 53 Troubleshooting Guide 3 ATB 46n/46e

6 SYMPTOM PAGE NUMBER Section Five - Emergency Power System Diagnostics Emergency pump motor non-operational 73 No functions when on emergency power (Emergency power unit is operating) 73 Section Six - Swing System Diagnostics Swings erratically in either direction 79 Swings faster one way than other 79 Swings too slow 79 Section Seven - Platform Rotation System Diagnostics Platform rotate does not operate 87 Platform rotates too slow 87 Platform rotates itself 87 Section Eight - Platform Leveling System Diagnostics Platform will not level as boom raises or lowers 93 Platform will not maintain level with machine off 93 Section Nine- Boom Elevation System Diagnostics Main boom raises but will not remain elevated 99 Riser boom raises but will not remain elevated 99 Jib boom raises but will not remain elevated 99 Jib boom raises but will not remain at vertical elevation 99 Section Ten- Telescope System Diagnostics Boom drifts in 105 Troubleshooting Guide 4 ATB 46n/46e

7 SYMPTOM PAGE NUMBER Section Eleven - Fuel System Diagnostics Engine will not start on gasoline, but will start on L.P. 109 Engine will not start on L.P., but will start on gasoline 109 Section Twelve- Accessories Diagnostics AC Generator will not function 117 AC Generator has low voltage 117 Section Thirteen- Pins and Functions List Wiring harness pin and function list Part 2 ATB 46e Section One - Error Codes Service required: Error Codes Digital display does not function 133 Section Two- Hydraulic Diagnostics Hydraulic system functions on emergency power only 147 Hydraulic pump continually runs when foot switch is depressed 147 Hydraulic functions are sluggish 147 Hydraulic pump will not build enough pressure 148 Flow from hydraulic pump is too low (slow functions) 148 Flow from hydraulic pump is too high 148 Section Three- Steering System Diagnostics Machine will not steer 161 Troubleshooting Guide 5 ATB 46n/46e

8 SYMPTOM PAGE NUMBER Section Four - Drive System Diagnostics Drive wheel speed is too slow 167 Machine drives only 1/2 normal speed in either high or low range 167 One wheel turns slower or faster than other 167 Battery charger needle does not register when plugged into 110 volt 167 No reverse (forward ok) 168 Drive wheels run in opposite direction 168 Section Five- Emergency Power System Diagnostics Emergency pump motor non-operational 177 Section Six - Swing System Diagnostics Swings erratically in either direction 183 Swings faster one way than other 183 Swings too slow 183 Section Seven - Platform Rotation System Diagnostics Platform rotate does not operate 191 Platform rotates too slow 191 Platform rotates itself 191 Section Eight - Platform Leveling System Diagnostics Platform will not level as boom raises or lowers 197 Platform will not maintain level with machine off 197 Section Nine - Boom Elevation System Diagnostics Main boom raises but will not remain elevated 203 Riser boom raises but will not remain elevated 203 Jib boom raises but will not remain elevated 203 Jib boom raises but will not remain at vertical elevation 203 Troubleshooting Guide 6 ATB 46n/46e

9 SYMPTOM PAGE NUMBER Section Ten - Telescope System Diagnostics Boom drifts in 209 Section Eleven- Pins and Functions List Wiring harness pin and function list Troubleshooting Guide 7 ATB 46n/46e

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11 Part 1

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13 SECTION ONE: ENGINE DIAGNOSTICS

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15 SECTION ONE ENGINE DIAGNOSTICS Chart 1 Engine starter fails to operate (No Electrical) Battery and Cable Connections OK Step 2 Power Cables and Battery Disconnect Switch OK Step 3 Ground Control Circuit Breaker (20 Amp) Step 4 Step 5 OK Emergency Stop Switch OK Keyed Ignition Switch Step 6 OK Platform/Base Selector Switch 18 Step 7 OK Engine Anti-Restart Relay OK Step 8 Engine Starter Relay Step 9 OK Starter Solenoid 20 Chart 2 Starter disengages before engine starts Step 2 Anti-Restart Circuit OK Anti-Restart Resistor Troubleshooting Guide 13 ATB 46n/46e

16 SECTION ONE ENGINE DIAGNOSTICS Chart 3 Engine starts then shuts down after 30 seconds Step 2 Engine Temperature Gauge OK Engine Oil Pressure Switch Step 3 OK Run Relay 23 Chart 4 Engine cranks over but will not start Step 2 Keyed Ignition Switch OK Platform/Base Selector Switch Step 3 Step 4 Step 5 Step 6 OK Run Relay OK Time Delay Module OK Fuel Pump OK Run Solenoid (Diesel only) Troubleshooting Guide 14 ATB 46n/46e

17 SECTION ONE ENGINE DIAGNOSTICS Chart 5 Engine will not accelerate Throttle Circuit Breaker (10 Amp) Step 2 OK Throttle Interlock Step 3 Step 4 OK Throttle Relay OK Throttle Solenoid Chart 6 Engine will not start from platform control, but will start from ground control Platform/Base Selector Switch OK Step 2 Platform Control Circuit Breaker (15 Amp) OK Step 3 Emergency Stop Switch at Platform Step 4 OK Foot Switch 30 Step 5 OK Platform Keyed Ignition Switch Step 6 OK Emergency Power Switch Chart 7 Engine starts while cranking, then dies when key switch is released Step 2 Keyed Ignition Switch OK Time Delay Module Troubleshooting Guide 15 ATB 46n/46e

18 SECTION ONE ENGINE DIAGNOSTICS Engine starter fails to operate (No Electrical) Batteries omit hydrogen and oxygen elements that can combine explosively. Do not smoke or permit open flames or sparks when checking batteries Batteries Recharge or replace battery(s) If low or no voltage Using a meter set to read voltage, check each battery for 12 volts while under load If 12V If corroded Check battery connections If loose Step 2 Power Cables and Battery Disconnect Switch Clean all connections Tighten all connections Using a meter set to read ohms, measure resistance to ground Should show no resistance If Battery Disconnect Switch in Off Position Then Reset Battery Disconnect Switch to On Position Go to step 3 If Ok If Ok If showing resistance Check connections to insure good ground If connections Ok Repair or replace Battery Disconnect Switch and/or Battery Disconnect Switch wiring Troubleshooting Guide 16 ATB 46n/46e

19 SECTION ONE ENGINE DIAGNOSTICS Ground Control Circuit Breaker (20 Amp) If Circuit Breaker is open Then Using a meter set to read voltage, turn Battery Disconnect Switch to On position, measure voltage input on Emergency Stop Switch Should read volts If low or no reading Replace Circuit Breaker If 10-12V Check for voltage between Circuit Breaker and Emergency Stop Switch on wire #1A Should read volts If low or no reading Step 3 Go to step 4 Replace Circuit Breaker and/or Circuit Breaker wiring Step 4 Emergency Stop Switch If Emergency Stop Switch is off (pushed in) Then Pull Emergency Stop Switch (out) to the On position Go to step 5 If 10-12V Using a meter set to read voltage, pull Emergency Stop Switch out and measure voltage to Emergency Stop Switch and to Battery side of Ground Master (Key) Switch. Should read volts If low or no reading at Key Switch Replace Emergency Stop Switch and/or Emergency Stop Switch wiring Troubleshooting Guide 17 ATB 46n/46e

20 SECTION ONE ENGINE DIAGNOSTICS Keyed Ignition Switch Go to step 6 If 10-12V Using a meter set to read voltage, activate engine starter and measure voltage to Battery post side of Keyed Ignition Switch and to start side of Keyed Ignition Switch. Should read volts If low or no reading Step 5 Step 6 Platform/Base Selector Switch If Platform/Base Selector Switch is in Platform position Then Return Platform/ Base Selector Switch to Ground position Go to step 7 If 10-12V Repair or replace Keyed Ignition Switch and/or Keyed Ignition Switch wiring Set Selector Switch to Ground position. Using a meter set to read voltage, activate starter and measure voltage to Platform/Base Selector Switch and Ignition/ Emergency Power Switch Should read volts If low or no reading Replace Platform/Base Selector Switch Troubleshooting Guide 18 ATB 46n/46e

21 SECTION ONE ENGINE DIAGNOSTICS Engine Anti- Restart Relay Replace Circuit Board If low or no reading Using a meter set to read voltage, activate engine starter and measure voltage on wire #5C Should read volts If 10-12V Measure voltage output from Anti-Restart Relay to Start Relay volts If 10-12V If low or no reading Go to step 8 Replace Engine Anti-Restart Relay Step 7 Step 8 Engine Starter Relay Go to step 9 If 10-12V Using a meter set to read voltage, activate engine starter and measure voltage on wire #5B from Starter Relay to Starter Solenoid Should read volts If low or no reading Replace Engine Starter Relay wiring Troubleshooting Guide 19 ATB 46n/46e

22 SECTION ONE ENGINE DIAGNOSTICS Starter Solenoid Repair or replace Starter If 10-12V Using a meter set to read voltage, activate engine starter and measure voltage from wire #5A to Starter Solenoid Should read volts If low or no reading Step 9 Replace Starter Solenoid wiring Troubleshooting Guide 20 ATB 46n/46e

23 SECTION ONE ENGINE DIAGNOSTICS Starter disengages before engine starts Step 2 Engine Anti- Restart Circuit Open field in alternator Disconnect wire #164B from Alternator. Check continuity between post and alternator case. No continuity Repair or replace Alternator Anti-Restart Resistor Continuity Adjust resistor for longer cranking time, until engine starts and alarm shuts off. (approx. 30 seconds) Locate the adjustable resistor between terminals on Circuit Board While activating the starter, slowly slide adjuster until cranking time is sufficient for starting engine. Using a meter set to read voltage, measure voltage output an Anti-Restart Resistor. Should read approx. 7.2 volts Using a meter set to read ohms, measure ohms across Resistor Should read approx. 68 ohms If abnormal readings Readjust Anti-Restart resistor Troubleshooting Guide 21 ATB 46n/46e

24 SECTION ONE ENGINE DIAGNOSTICS Engine starts then shuts down after 30 seconds Engine Temperature Gauge Allow time for Engine to cool down Then If continuity is shown Using a meter set to read ohms, Check continuity on S Post (6) of Time Delay Module Should not show continuity to ground If continuity is not shown Check Engine Temperature Gauge reading If less than 230 degrees Replace Engine Temperature Gauge Go to Step 2 If continuity If no continuity Check continuity on white wire on Temperature Gauge. With white wire unplugged, should not show continuity to ground Find source of Engine heating problem If greater than 230 degrees Step 2 Engine Oil Pressure Switch If Lack of engine oil pressure is due to inadequate oil level Then If oil level is adequate Using a meter set to read ohms, Check continuity between wire #3C and Ground wire at Engine Oil Pressure Switch If resistance is shown Replace Engine Oil Pressure Switch Fill to proper level with oil Troubleshooting Guide 22 ATB 46n/46e

25 SECTION ONE ENGINE DIAGNOSTICS Run Relay Observe LED L3 on Circuit Board If lit Using a meter set to read voltage, measure voltage input on at Circuit Breaker (10 amp), and voltage output B Post (1&2) of Time Delay Module Should read volts If low or no reading Step 3 Replace Run Relay Troubleshooting Guide 23 ATB 46n/46e

26 SECTION ONE ENGINE DIAGNOSTICS Engine cranks over but will not start Keyed Ignition Switch Go to step 2 If 10-12V Using a meter set to read voltage, activate engine starter and measure voltage to Battery post side of Keyed Ignition Switch and to ignition side of Keyed Ignition Switch. Should read volts No reading If reading is low Repair or replace Keyed Ignition Switch and/or Keyed Ignition Switch wiring Check Battery Step 2 Platform/Base Selector Switch If Platform/Base Selector Switch is in Platform position Then If 10-12V Using a meter set to read voltage, measure voltage on Center Pin Right side of Ground/Platform Selector Switch Should read volts No reading Replace Circuit Board Return Platform/ Base Selector Switch to Ground position Measure voltage on top right Pin of Ground/ Platform Selector Switch Should read volts No reading Go to step 3 Troubleshooting Guide 24 ATB 46n/46e

27 SECTION ONE ENGINE DIAGNOSTICS Run Relay Observe LED L3 on Circuit Board If lit Replace 10 amp Circuit Breaker If low or no reading Using a meter set to read voltage, measure voltage input on at Circuit Breaker (10 amp) Should read volts If 10-12V If not lit Measure voltage output B Post (1&2) of Time Delay Module Should read volts Go to Step 4 Step 3 Step 4 Time Delay Module Observe LED L3 on Circuit Board If lit Go to step 5 If 10-12V Using a meter set to read voltage, measure voltage at B Post (1&2) of Time Delay Module Should read volts If not lit If low or no reading Replace Time Delay Module Troubleshooting Guide 25 ATB 46n/46e

28 SECTION ONE ENGINE DIAGNOSTICS Fuel Pump Return to Replace Fuel pump Repair Jumper Time Delay Module Circuit If low or no reading If 10-12V If damaged If 10-12V Using a meter set to read voltage, measure voltage on Terminal 8 on Circuit Board Should read volts If 10-12V Measure voltage on wire #64 to Fuel Pump Should read volts If low or no reading Jumper S16 for damage If no damage Observe LED L19 If lit Step 5 Step 6 Run Solenoid (Diesel only) Replace Circuit Board Using a meter set to read voltage, measure voltage on wire #8 to Run Solenoid Should read volts If low or no voltage Measure voltage on wire #5A from Start Solenoid Should read volts If 10-12V Repair or replace Wiring Troubleshooting Guide 26 ATB 46n/46e

29 SECTION ONE ENGINE DIAGNOSTICS Engine will not accelerate Throttle Circuit Breaker (10 Amp) If Circuit breaker is open Then Reset Circuit Breaker If 10-12V Using meter set to read voltage, measure voltage input and output of Throttle Circuit Breaker Should read volts If low or no reading Step 2 Go to step 2 Throttle Relay Replace Circuit Breaker Observe LED L5 If lit If 10-12V Using a meter set to read voltage, measure voltage on wire #55A at Throttle Solenoid Should read volts If low or no reading Go to step 3 Repair or replace Throttle Relay Troubleshooting Guide 27 ATB 46n/46e

30 SECTION ONE ENGINE DIAGNOSTICS Throttle Interlock Switch Go to step 4 If Ok Using meter set to read voltage, measure voltage input on Throttle Interlock Center Post on Switch, hold switch up (in on position) and measure voltage output on Bottom Post Should read volts If low or no voltage Replace Throttle Interlock Switch Step 3 Step 4 Throttle Solenoid Harness If low or no voltage Using a meter set to read voltage, measure voltage on wire #55A at Throttle Solenoid Should read volts If 10-12V Replace Solenoid If continuity exists Check continuity to ground through Throttle Solenoid If no continuity exists Repair or replace Ground Wire Troubleshooting Guide 28 ATB 46n/46e

31 SECTION ONE ENGINE DIAGNOSTICS Engine will not start from platform control, but will from ground control Step 2 Platform/Base Selector Switch If Platform/Base Selector Switch is in Ground position Then Return Platform/ Base Selector Switch to Platform position Go to step 2 Platform Control Circuit Breaker (15 Amp) If Circuit Breaker is open Then Reset Circuit Breaker Go to step 3 If 10-12V If 10-12V Set Selector Switch to Platform position. Using a meter set to read voltage, activate starter and measure voltage to Ignition/Emergency Power Switch and Platform/Base Selector Switch Should read volts If low or no reading Replace Platform/Base Selector Switch Using a meter set to read voltage, turn Ground/Platform Switch to Platform position, measure voltage entering Platform Emergency Stop Switch Should read volts If low or no reading Repair or replace Circuit Breaker and/or Circuit Breaker wiring Troubleshooting Guide 29 ATB 46n/46e

32 SECTION ONE ENGINE DIAGNOSTICS Emergency Stop Switch at Platform If Using a meter set to read voltage, pull Emergency Stop Switch out and measure voltage between Emergency Stop Switch and Battery side of Platform Master Switch. Should read volts If low or no reading Step 3 Emergency Stop Switch is off (pushed in) Then Pull Emergency Stop Switch (out) to the on position Go to step 4 If 10-12V Check for voltage to Ribbon Cable and wire #1 to12v Power Supply to Platform Should read volts If low or no reading Replace Emergency Stop Switch and/or Emergency Stop Switch wiring Step 4 Foot Switch and Wiring Make sure Foot Switch is not activated Deactivate Foot Switch If activated If not activated Go to step 5 If 10-12V Using a meter set to read voltage, measure voltage on wire #10 going into Foot Switch and wire #8 coming out of Foot Switch Should be volts If low or no voltage Repair or replace Foot Switch and/or wiring Troubleshooting Guide 30 ATB 46n/46e

33 SECTION ONE ENGINE DIAGNOSTICS Platform Keyed Ignition Switch Go to step 6 If 10-12V Using a meter set to read voltage, activate Platform Keyed Ignition Switch and measure voltage to Post side of Platform Keyed Ignition Switch Should read volts If low or no reading Replace Platform Keyed Ignition Switch Step 5 Step 6 Emergency Power Switch Return to step 1 If no continuity exists Using a meter set to read ohms, check for continuity between Emergency Engine Cutout Relay (wire #45) and ground Should show continuity to ground If continuity exists Check for continuity at both sides of Platform Emergency Power Switch If continuity exists Repair or Replace Emergency Power Switch at Platform Troubleshooting Guide 31 ATB 46n/46e

34 SECTION ONE ENGINE DIAGNOSTICS Engine starts while cranking, then dies when key switch is released Keyed Ignition Switch Go to step 2 If 10-12V Using a meter set to read voltage, activate engine starter and measure voltage to Battery post side of Keyed Ignition Switch and to start side of Keyed Ignition Switch. Should read volts If low or no reading Repair or replace Keyed Ignition Switch and/or Keyed Ignition Switch wiring Step 2 Time Delay Module Using a meter set to read voltage, measure voltage 1. on B post (1 & 2) of Time Delay Module 2. on NC post (5) of Time Delay Module Should read volts If low or no reading Replace Time Delay Module Troubleshooting Guide 32 ATB 46n/46e

35 SECTION TWO: HYDRAULIC DIAGNOSTICS

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37 SECTION TWO HYDRAULICS DIAGNOSTICS Chart 1 Hydraulic system functions on emergency power only Step 2 Main Hydraulic Pump OK Sense Line Dump Cartridge Chart 2 Hydraulic pump stays on stroke Compensator Valve 38 Chart 3 Hydraulic functions are sluggish Engine RPM 39 Step 2 OK Pump Pressure 39 Step 3 OK Flow from Pump 40 Chart 4 Hydraulic pump will not build enough pressure Compensator Valve 41 Troubleshooting Guide 35 ATB 46n/46e

38 SECTION TWO HYDRAULICS DIAGNOSTICS Chart 5 Flow from hydraulic pump is too low (slow functions) Flow Adjustment on Main Hydraulic Pump 42 Chart 6 Flow from hydraulic pump is too high (kills engine) Flow Adjustment on Main Hydraulic Pump 42 Troubleshooting Guide 36 ATB 46n/46e

39 SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic system functions on emergency power only Main Hydraulic Pump Remove gauge and Go to step 2 If 275 to 300 psi Install 1000 psi pressure gauge to hydraulic pump test port on Emergency Power Unit. Set engine for idle and measure differential/ standby pressure. Should read 275 to 300 psi If reading is abnormal Adjust Standby pressure If malfunctioning Step 2 Dump Valve Cartridge Check seals on Dump Valve Cartridge If 10-12V Repair or replace Main Hydraulic Pump and/or Pump Coupling Using a meter set to read voltage, activate Ground Control Switch and measure voltage on wire # 28B at Sense Line Dump Valve Should read volts If bad If low or no reading Repair or replace Dump Valve Cartridge Repair or replace wiring to Sense Line Dump Valve Troubleshooting Guide 37 ATB 46n/46e

40 SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic pump stays on stroke Compensator Valve Check seals on Sense Line Dump Valve Cartridge If bad If goes off stroke Remove and plug hose to compensator from PLS Port of Station Valve. Recheck pressure on Pump If stays on stroke Repair or replace Compensator Repair or replace Sense Line Dump Valve Cartridge Troubleshooting Guide 38 ATB 46n/46e

41 SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic functions are sluggish Engine RPM Go to step 2 If correct RPM Use a Tachometer to measure Engine RPM's Should read: 1200 RPM at Low RPM at High If incorrect RPM Adjust Throttle Accuator Step 2 Pump Pressure Go to step 3 If 300 psi Install 5000 psi pressure gauge at Emergency Power Test Port. Set engine for idle and measure system pressure. Should read 3500 psi If low or no reading Adjust Pump Compensator Troubleshooting Guide 39 ATB 46n/46e

42 SECTION TWO HYDRAULICS DIAGNOSTICS Flow from Pump Remove gauges and Return to step 1 If 12 to 14 gpm and 1500 psi With chassis raised (all wheels off the ground) and adequately supported, 1.Install a Flowmeter on the discharge side of pump. 2.Install a 5000 psi pressure gauge at Pump Test Port. Start engine and activate drive function full on. Flowmeter should read 12 to14 gpm and pressure gauge should read 1500 psi in High Speed If low or no reading Step 3 Adjust Flow Ajustment Troubleshooting Guide 40 ATB 46n/46e

43 SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic pump will not build enough pressure Compensator Valve Remove gauge and check Seals on Dump Valve Cartridge If bad Repair or replace Dump Valve Cartridge If 3500 psi Remove hose from PLS Port on 3 Station Valve to Compensator and reattach to Pressure Line. Using a 5000 psi pressure guage check pressure Should read 3500 psi If low or no reading Adjust Pressure If still low Replace Compensator and/or Pump Troubleshooting Guide 41 ATB 46n/46e

44 SECTION TWO HYDRAULICS DIAGNOSTICS Flow from hydraulic pump is too low (slow or sluggish) Flow Adjustment on Main Hydraulic Pump Visually check Flow Adjustment Screw on Main Hydraulic Pump Screw should extend 1/4" beyond Jam Nut Flow from hydraulic pump is too high (kills engine) Flow Adjustment on Main Hydraulic Pump Reset Flow Adjustment on Main Hydraulic Pump Visually check Flow Adjustment Screw on Main Hydraulic Pump Screw should extend 1/4" beyond Jam Nut Reset Flow Adjustment on Main Hydraulic Pump Troubleshooting Guide 42 ATB 46n/46e

45 SECTION THREE: STEERING SYSTEM DIAGNOSTICS

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47 SECTION THREE STEERING SYSTEM DIAGNOSTICS Chart 1 Machine will not steer Step 2 3-Way S1 Micro-Switch Steer S2 Micro Switch (Right) Step 3 OK OK Steer S3 Micro Switch (Left) Step 4 OK Steer Control Valve 47 Troubleshooting Guide 45 ATB 46n/46e

48 SECTION THREE STEERING SYSTEM DIAGNOSTICS Machine will not steer During activation of steering function the machine will be moving. Note: At this point the manual override may also be use to isolate the solenoid, however use caution as the machine will be moving. 3-Way S1 Micro-Switch Go to step 2 If 12V Using a meter set to read voltage, while steering measure voltage to S1 Micro-Switch. Should read volts on normally open Terminal of Switch If low or no voltage Replace S1 Micro-Switch Step 2 Steer S2 Micro- Switch (Right) Go to step 3 If 10-12V Using a meter set to read voltage, activate Steer Right Switch and measure voltage 1. at Steer Right Post of Upper Circuit Board in Platform Control Box 2. on wire #20 at Steer Control Valve Should read volts If low or no reading Replace Steer S2 Micro-Switch (Solenoid) and/or Steer S2 Micro-Switch (Solenoid) wiring Troubleshooting Guide 46 ATB 46n/46e

49 SECTION THREE STEERING SYSTEM DIAGNOSTICS During activation of steering function the machine will be moving. Note: At this point the manual override may also be use to isolate the solenoid, however use caution as the machine will be moving. Steer S3 Micro- Switch (Left) Go to step 4 If 10-12V Using a meter set to read voltage, activate Steer Right Switch and measure voltage 1. at Steer Left Post of Upper Circuit Board in Platform Control Box 2. on wire #19 at Steer Control Valve Should read volts If low or no reading Step 3 Replace Steer S3 Micro-Switch (Solenoid) and/or Steer S3 Micro-Switch (Solenoid) wiring Step 4 Steer Control Valve Install 5000 psi pressure gauge at Three Station Valve and swap swing wiring with steer wiring. Activate swing function (this will activate steer function) Should read 2400 psi If lower than 2400 psi Reset Steer Pressure Troubleshooting Guide 47 ATB 46n/46e

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51 SECTION FOUR: DRIVE SYSTEM DIAGNOSTICS

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53 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 1 Drive system is not operational with controller in either direction Step 2 Ground PWM Relay OK Circuit Breaker (40 amp) Step 3 OK Step 4 Drive Circuit Breaker (4 amp) Platform PWM Relay OK Step 5 Controller Circuit Board and S1 Micro Switch Wiring OK Step 6 OK S1 Micro-Switch (in Controller) Step 7 OK Controller Circuit Board Step 8 OK Potentiometer 57 Step 9 OK S2 Micro-Switch (in Controller) 0 Apitech Drive Section Pulsar OK 1 Drive Section of Apitech Control Valve OK Troubleshooting Guide 51 ATB 46n/46e

54 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 2 No forward drive (reverse ok) Step 2 S2 Micro-Switch (in Drive Controller) Drive Controller Circuit Board OK Step 3 Pulsar Valve (Drive Forward on Apitech Control Valve) OK Chart 3 No reverse drive (forward ok) Step 2 S2 Micro-Switch (in Drive Controller) Drive Controller Circuit Board OK Step 3 Pulsar Valve (Drive reverse on Apitech Control Valve) OK Chart 4 Drive high range not operating Step 2 Boom Position and/or Boom Limits Switch OK Drive Low/High Range Switch Step 3 Step 4 OK Tilt Range Relay OK Range Valve OK Step 4 Selector Spool in Transmission Package 66 Troubleshooting Guide 52 ATB 46n/46e

55 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 5 Machine drives at full speed with platform raised and/or extended Step 2 Boom Limits Switch OK 67 Range Valve 67 Chart 6 Brakes will not release Brake Pressure 68 Chart 7 Only one wheel turns or one wheel turns faster (2 wheel drive) Step 2 Drive Circuit OK 69 Drive Valve 69 Step 3 OK Case Drain 70 Step 4 OK Dual Sequence Valves 70 Troubleshooting Guide 53 ATB 46n/46e

56 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive system is non-operational with controller in either direction Circuit Breaker (40 amp) Replace Circuit Breaker If 10-12V Using a meter set to read voltage, measure voltage from Battery positive (+) to Circuit Breaker Should read volts If low or no voltage Repair or replace Wiring Step 2 Drive Circuit Breaker (4 amp) Measure voltage on wire marked PWM Fuse Should read volts If 10-12V If 10-12V Using a meter set to read voltage, activate Foot Switch and measure voltage on wire #158 Should read volts If low or no voltage OK Go to step 3 Replace Circuit Breaker Repair or replace Cable Control wiring Troubleshooting Guide 54 ATB 46n/46e

57 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Platform PWM Relay Go to step 4 If 10-12V With Foot Switch activated and using a meter set to read voltage, measure voltage on Positive (+) Post of Drive Controller Should read volts If low or no voltage Replace Platform PWM Relay If 10-12V Measure voltage on Drive Positive (+) wire at PWM Relay Should read volts If low or no voltage Replace Circuit Board and/or Ribbon cable Step 3 Step 4 Ground PWM Relay Replace Ground PWM Relay If 10-12V Using a meter set to read voltage, on wire #158 from Ground PWM Relay Should read volts If low or no voltage Go to step 5 Troubleshooting Guide 55 ATB 46n/46e

58 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Controller Circuit Board and S1 Micro-Switch Wiring Go to step 6 If 10-12V Using a meter set to read voltage, activate Foot Switch and measure voltage 1. on red wire from Circuit Board to S1 Micro-Switch 2. at red wire of S1 Micro-Switch Should read volts If low or no voltage Step 5 Step 6 S1 Micro-Switch (in Controller) Replace Circuit Board and/or S1 Micro-Switch wiring Move controller handle in either direction and observe red LED on Circuit Board Controller If not lit Go to step 7 Replace S1 Micro-Switch (in Controller) and/or S1 Micro-Switch wiring If lit Using a meter set to read voltage, step on Foot Switch and activate Controller, measure voltage 1. on black wire between S1 Micro-Switch and Controller Circuit Board 2. at point where black wire from S1 Switch enters Controller Circuit Board Should read volts If low or no voltage Troubleshooting Guide 56 ATB 46n/46e

59 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Controller Circuit Board Using a meter set to read voltage, step on Foot Switch and activate Controller to forward position, measure voltage on Terminal A, forward of Controller Circuit Board Should read volts If low or no reading Step 7 Go to step 8 Replace Controller Circuit Board and/or Controller Circuit Board wiring If 10-12V If low or no reading Step on Foot Switch and activate Controller, measure voltage 1. on green wire to Potentiometer from Controller Circuit Board 2. on wire between Controller Circuit Board and Potentiometer Should read volts Step 8 Potentiometer Go to step 9 Replace Potentiometer and/or Potentiometer wiring continuity Using a meter set to ohms, measure reading across 1. green wire and purple wire between Controller Circuit Board and Potentiometer 2. green wire and orange wire between Controller Circuit Board and Potentiometer Reading should vary according to Controller movement If no reading Check continuity on wire between Controller Circuit Board and Potentiometer No continuity Troubleshooting Guide 57 ATB 46n/46e

60 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Step 9 0 Continuity S2 Micro-Switch (in Controller) Check continuity on blue wire and on white wire between Controller Circuit Board and S2 Micro-Switch No Continuity Replace S2 Micro-Switch and/or S2 Micro-Switch wiring Go to step 10 Apitech Drive Section, Pulsars If no reading Using a meter set to read voltage, step on Foot Switch and activate Controller, perform the following: 1. While activating controller in forward mode measure proportional voltage at Controller Circuit Board where white wire enters from S2 Micro-Switch 2. While activating Controller in reverse mode measure proportional voltage at Controller Circuit Board where blue wire enters from S2 Micro-Switch Reading should vary according to amount of reverse movement While activating Drive function, activate Overrides for each section of control Valve simultaneously If functions are normal If functions are abnormal or erratic Replace Drive Section of Apitech Control Valve Go to step 11 Troubleshooting Guide 58 ATB 46n/46e

61 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive Section of Apitech Control Valve With Drive Control activated, use a meter set to read voltage and measure voltage on 17 and 17A of Drive Pulsars Voltage will vary If low or no voltage Wiring Harness for faulty wiring 1 Repair or replace as needed Troubleshooting Guide 59 ATB 46n/46e

62 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS No forward drive (Reverse Ok) S2 Micro-Switch (in Drive Controller) Go to step 2 If normal reading Using a meter set to read voltage, activate function and measure proportional voltage at Controller Circuit Board at point where blue wire from S2 Micro-Switch enters. Reading should vary according to controller movement. If low or no reading Check continuity on blue wire between S2 Micro- Switch and Controller Circuit Board no continuity Step 2 Replace S2 Micro-Switch and/or S2 Micro-Switch wiring Drive Controller Circuit Board Go to step 3 normal reading Using a meter set to read voltage, activate drive function and measure proportional voltage at Terminal A of Circuit Board. Reading should vary according to controller movement. If no or erratic reading Replace Drive Controller Circuit Board Troubleshooting Guide 60 ATB 46n/46e

63 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Pulsar Valve (Drive forward on Apitech Control Valve) Using a meter set to read voltage. While activating forward function, measure proportional voltage at wire #17and 17A on Drive sections of Apitech Valve. Reading should vary according to controller movement. If no reading Try manual override Step 3 override allows operation Replace Drive Forward Pulsar Valve and/or Drive Forward Pulsar Valve wiring Troubleshooting Guide 61 ATB 46n/46e

64 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS No reverse drive (Forward Ok) S2 Micro-Switch (in Drive Controller) Go to step 2 normal reading Using a meter set to read voltage, activate reverse function and measure proportional voltage at Controller Circuit Board at point where white wire from S2 Micro- Switch enters. Reading should vary according to controller movement. If low or no reading Check continuity on white wire between S2 Micro- Switch and Controller Circuit Board no continuity Replace S2 Micro-Switch and/or S2 Micro-Switch wiring Step 2 Drive Controller Circuit Board Go to step 3 normal reading Using a meter set to read voltage, activate reverse function and measure proportional voltage at Terminal B of Controller Circuit Board Reading should vary according to controller movement If no or erratic reading Replace Drive Controller Circuit Board Troubleshooting Guide 62 ATB 46n/46e

65 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Pulsar Valve (Drive reverse on Apitech Control Valve) Using a meter set to read voltage. While activating reverse function, measure proportional voltage at wire #18 and 18A on Drive section of Apitech Valve. Reading should vary according to controller movement. If no reading Try manual override Step 3 override allows operation Replace Drive Reverse Pulsar Valve and/or Drive Reverse Pulsar Valve wiring Troubleshooting Guide 63 ATB 46n/46e

66 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive high range not operating Boom Position and/or Boom Limits Switch Booms are not positioned for High Range speed operations Boom Limits Switch are not Adjusted Go to step 2 still not operating Position Booms to fully retracted and down position Adjust Boom Retract/Down Limit Switch Step 2 Low/High Drive Range Switch Measure power on X Terminal of Circuit Board Should read volts If 10-12V Using a meter set to read voltage, measure voltage 1. on wire #70A going to the center terminal of the Low/High Drive Range Switch. 2. on wire #159 and #34 coming out of the Low/ High Drive Range Switch. Should read volts If low or no reading If 10-12V Go to step 3 Replace Circuit Board If low or no reading Replace Drive Low/High Range Switch and/or Drive Low/High Range Switch wiring Troubleshooting Guide 64 ATB 46n/46e

67 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Step 3 Step 4 Tilt Range Relay Go to step 4 Repair or replace Wiring Harness Range Relay Replace Time Delay Module If lit If 10-12V If low or no voltage on Terminal 1 Observe Tilt Range Relay LED L25 If not lit Using a meter set to read voltage, measure voltage on wire #73A at Tilt Alarm Sensor Should be volts If low or no voltage Replace Tilt Alarm Sensor Using a meter set to read voltage, measure voltage input on Terminal 4 and voltage output on Terminal 1 Should be volts If low or no voltage on Terminal 4 Replace Platform Control Panel Lower Circuit Board Troubleshooting Guide 65 ATB 46n/46e

68 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Range Valve Readjust Pressure Reducing Valve If low Using a 5000 psi pressure gauge, measure pressure on hose at Port A of Range Valve Should read 250 psi If no reading Repair or replace Range Valve If ok Measure pressure on hose at Port B of Range Valve Should read 250 psi If no reading Step 5 Repair or replace Range Valve Troubleshooting Guide 66 ATB 46n/46e

69 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine drives at full speed with platform raised and/or extended Boom Limits Switch Boom Limits Switch are sticking or not properly Adjusted Go to step 2 If problem still exists Repair, replace or readjust Boom Limits Switch Step 2 Range Valve Readjust Pressure Reducing Valve If low Using a 5000 psi pressure gauge, measure pressure on hose at Port A of Range Valve Should read 250 psi If no reading Repair or replace Range Valve If ok Measure pressure on hose at Port B of Range Valve Should read 250 psi If no reading Repair or replace Range Valve Troubleshooting Guide 67 ATB 46n/46e

70 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Brakes will not release Brake Pressure Install a 5000psi pressure gauge in LS Port of Drive Valve Should read Drive Pressure If not Repair or replace Brake Shuttle Valve Troubleshooting Guide 68 ATB 46n/46e

71 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Only one wheel turns (2 wheel drive) Drive Circuit Using a meter set to read voltage, measure voltage17 and 17A at Pulsar Should read same voltage If not for faulty wiring If wiring is not faulty Swap wires and measure voltage17 and 17A at Pulsar again Step 2 Drive Valve Replace Pulsar with lowest voltage reading While activating function, activate both sets of overrides. If problem quits Repair or replace Valve Section If problem does not switch to opposite wheel Swap Pulsar, activate function and observe location of problem If problem switches to opposite wheel Replace defective Pulsar Troubleshooting Guide 69 ATB 46n/46e

72 SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Case Drain If less than.5 gpm Disconnect existing hose, install a flowmeter between existing hose and Drive Motor. Should be no more than.5 gpm If more than.5 gpm Step 3 Step 4 Go to step 4 Dual Sequence Valves Repair or replace Drive Motor Identify if problem is the same in Forward Drive as in Reverse Drive Return to step 1 Repair or replace Valve Section If yes If problem does not change direction If not Swap Sequence Valves If problem changes direction Replace Drive Sequence Valve Troubleshooting Guide 70 ATB 46n/46e

73 SECTION FIVE: EMERGENCY POWER SYSTEM DIAGNOSTICS

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75 SECTION FIVE EMERGENCY POWER SYSTEM DIAGNOSTICS Chart 1 Emergency pump motor nonoperational Battery and Cable Connections Step 2 Step 3 OK Emergency Power Switch OK Emergency Engine Cutout Relay OK Step 4 Emergency Power Relay and Wiring Step 5 OK Emergency Power Unit Troubleshooting Guide 73 ATB 46n/46e

76 SECTION FIVE EMERGENCY POWER SYSTEM DIAGNOSTICS Emergency pump motor non-operational Recharge or replace battery If low or no voltage Go to step 2 Battery Using a meter set to read voltage, check battery for 12 volts while under load If 12V If corroded Check battery connections If loose If Ok Step 2 Emergency Power Switch Go to step 3 Clean all connections If continuity exists Tighten all connections Using a meter set to read continuity, activate Emergency Power Switch and check for continuity to ground across Emergency Power Switch Should show continuity to ground No continuity Repair or Replace Emergency Power Switch Troubleshooting Guide 74 ATB 46n/46e

77 SECTION FIVE EMERGENCY POWER SYSTEM DIAGNOSTICS Emergency Engine Cutout Relay Go to step 4 If continuity exists Using a meter set to read continuity, activate Emergency Power Switch and check for continuity to ground on wire #6 Should show continuity to ground If not Step 3 Step 4 Emergency Power Relay Go to step 5 If Battery voltage Repair or Replace Emergency Engine Cutout Relay Using a meter set to read voltage, activate Emergency Power Switch and measure Battery voltage at Emergency Pump Motor Should be Battery voltage If not Repair or Replace Emergency Power Relay Troubleshooting Guide 75 ATB 46n/46e

78 SECTION FIVE EMERGENCY POWER SYSTEM DIAGNOSTICS Emergency Power Unit If previous checks have been performed and found to be normal, check Emergency Pump Motor for internal grounding condition If internal grounding exists Step 5 Repair or Replace Emergency Pump Motor Troubleshooting Guide 76 ATB 46n/46e

79 SECTION SIX: SWING SYSTEM DIAGNOSTICS

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81 SECTION SIX SWING SYSTEM DIAGNOSTICS Chart 1 Swings erratically in either direction Activate Manual Overrides 80 Step 2 OK Swing Control Valve 80 Step 3 OK Swing Motor 81 Chart 2 Swings faster one way than other Pressure Relief Valves 82 Chart 3 Swings too slow Activate Manual Overrides 83 Step 2 OK Swing Control Valve 83 Troubleshooting Guide 79 ATB 46n/46e

82 SECTION SIX SWING SYSTEM DIAGNOSTICS Swings erratically in either direction When the turn table rotates clockwise (cw) it will be moving toward you. Make sure you have room to step backward. Activate Manual Override Push in on Manual Override and observe swing operation Machine function will be moving when manual override is activated. Step 2 Swing Control Valve If ok If 1100 psi If still swings erratically Go to step 2 Replace Swing Control Valve Coils Remove hose from A Port. Plug hose, attach a 5000 psi pressure gauge to A Port. While activating Counterclockwise function, check pressure Should read 1100 psi If not Go to step 3 Readjust Swing Relief Valve Troubleshooting Guide 80 ATB 46n/46e

83 SECTION SIX SWING SYSTEM DIAGNOSTICS Swing Motor Visually check Swing Motor for damage or wear Repair or replace as needed Step 3 Troubleshooting Guide 81 ATB 46n/46e

84 SECTION SIX SWING SYSTEM DIAGNOSTICS Swings faster one way than other Pressure Relief Valves Remove hose from A Port of Swing Valve, install a 5000 psi pressure gauge on test port of Section Valve. Activate swing function in both directions, adjust reliefs to read 1100 psi Troubleshooting Guide 82 ATB 46n/46e

85 SECTION SIX SWING SYSTEM DIAGNOSTICS Swings too slow When the turn table rotates clockwise (cw) it will be moving toward you. Make sure you have room to step backward. Machine function will be moving when manual override is activated. Activate Manual Override Push in on Manual Override and observe swing operation If still swings erratically If ok Go to step 2 Step 2 Swing Control Valve Replace Swing Control Valve Coils Remove hose from A Port. Plug hose, attach a 5000 psi pressure gauge to A Port. While activating Counterclockwise function, check pressure Should read 1100 psi If not Readjust Swing Relief Valve Troubleshooting Guide 83 ATB 46n/46e

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87 SECTION SEVEN: PLATFORM ROTATION SYSTEM DIAGNOSTICS

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89 SECTION SEVEN PLATFORM ROTATION SYSTEM DIAGNOSTICS Chart 1 The platform rotate does not operate Step 2 Rotation Control Valve OK Pressure Relief Valves Chart 2 Platform rotates too slow Pressure Relief Valves 89 Chart 3 Platform rotates itself Holding Valves 90 Step 2 OK Platform Rotator 90 Troubleshooting Guide 87 ATB 46n/46e

90 SECTION SEVEN PLATFORM ROTATION SYSTEM DIAGNOSTICS Platform does not rotate Machine function will be moving when manual override is activated. Rotation Control Valve While activating Platform Rotate function, depress Manual Override If platform does not rotates If platform rotates Go to Step 2 Repair or replace Solenoids on Rotation Control Valve Step 2 Pressure Relief Valves Repair or replace Platform Rotator If 1500 psi Remove hose from Rotator. Plug hoses and cap Rotator. Using 5000 psi pressure gauge, activate platform rotate function and test pressure at test port on 3 section Valve. System pressure should read 1500 psi (while activated) If reading is abnormal Readjust Reliefs Troubleshooting Guide 88 ATB 46n/46e

91 SECTION SEVEN PLATFORM ROTATION SYSTEM DIAGNOSTICS Platform rotates too slow Pressure Relief Valves Repair or replace Platform Rotator If 1500 psi Remove hose from Rotator. Plug hoses and cap Rotator. Using 5000 psi pressure gauge, activate platform rotate function and test pressure at test port on 3 section Valve. System pressure should read 1500 psi (while activated) If reading is abnormal Readjust Reliefs Troubleshooting Guide 89 ATB 46n/46e

92 SECTION SEVEN PLATFORM ROTATION SYSTEM DIAGNOSTICS Platform rotates itself Holding Valves Visually check for stuck Valve or blown O-Rings Step 2 Platform Rotator If stuck and/or blown Replace Holding Valve and/or O-Rings Visually check for blown O-Rings If blown Repair or replace as needed Troubleshooting Guide 90 ATB 46n/46e

93 SECTION EIGHT: PLATFORM LEVELING SYSTEM DIAGNOSTICS

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95 SECTION EIGHT PLATFORM LEVELING SYSTEM DIAGNOSTICS Chart 1 Platform will not level as boom raise or lowers Step 2 Hydraulic Oil Temp OK Five Section Control Valve Chart 2 Platform will not maintain level with machine off Holding Valves in Slave Level Cylinder 95 Troubleshooting Guide 93 ATB 46n/46e