Troubleshooting Guide - PDF Free Download

Troubleshooting Guide P/N 0153180 July 1999 P.O. Box 1160 St. Joseph, MO 64502-1160 1-800-255-0317 Fax: 816-360-9379 www.snorkelusa.com

GENERAL INFORMATION This manual contains procedures for locating and correcting the majority of problems which may develop on the Snorkelift UNO 33 and 41 4x4 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 twelve distinct groups with each group covered by an individual section. The Sections are as follows: 1.) Engine Diagnostics 7.) Boom Functions 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.) Fuel System Diagnostics 6.) Swing System Diagnostics 12.) Accessories 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. 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) 364-0317 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. 1

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. 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. Example: Problem Solving Procedure Problem Example: Flowchart Procedure 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 0-1000 psi. A pressure gauge rated for 0-5000 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. 2

SYMPTOM PAGE NUMBER Section One - Engine Diagnostics Engine starter fails to operate (No Electrical) 9 Starter disengages before engine starts (Ford only) 10 Engine cranks over but will not start 10 Engine starts then shuts down after 30 seconds 11 Engine will not accelerate (Ford only) 11 Engine will not accelerate (Kubota only) 11 Engine over accelerates (Ford only) 12 Engine will not start from platform control 12 Engine starts while cranking, then dies when key switch is released 13 Section Two - Hydraulic Diagnostics Hydraulic system functions on emergency power only 39 Hydraulic pump stays on stroke 39 Hydraulic functions are sluggish 39 Hydraulic pump will not build pressure 39 Hydraulic pump will not build enough pressure 40 Flow from hydraulic pump is too low 40 Flow from hydraulic pump is too high (kills engine) 40 Section Three - Steering System Diagnostics Machine will not steer 51 3

SYMPTOM PAGE NUMBER Section Four - Drive System Diagnostics Drive system is not operational with controller in either direction 57 No forward drive (reverse ok) 58 No reverse drive (forward ok) 58 Drive high range not operating (mid speed ok) 59 Drive mid range not operating (low speed ok) 59 Wheel on one side rotate faster than wheels on other side 59 One wheel rotates slower than others 60 Brakes will not release 60 Section Five - Emergency Power System Diagnostics Emergency pump motor non-operational 83 No functions when on emergency power 83 Section Six - Swing System Diagnostics Swings only in one direction 89 No response from swing when platform controls are activated (ground controls ok) 89 No response from swing when ground controls are activated (platform controls ok) 89 Swings erratically in either direction 90 Swings faster one way than other 90 Swing brake will not hold 90 Swings too slow 91 Section Seven - Boom Functions Diagnostics No boom functions from ground control 107 No boom functions from platform control 107 4

SYMPTOM PAGE NUMBER Section Eight - Platform Leveling System Diagnostics Platform will not maintain level as boom raises or lowers 115 Platform will not maintain level with machine off 115 Platform level will not work from ground control (platform control ok) 115 Platform level will not work from platform control (ground control ok) 115 Platform level up function is inoperative 116 Platform level down function is inoperative 116 Section Nine - Boom Elevation System Diagnostics Boom raises but will not stay elevated (Bottom/Middle/Top) 127 Bottom boom will not raise from platform control (ground control ok) 127 Middle boom will not raise from platform control (ground control ok) (Uno 41 only) 127 Top boom will not raise from platform control (ground control ok) 127 Bottom boom will not raise from ground control 128 Middle boom will not raise from ground control (Uno 41 only) 128 Top boom will not raise from ground control 128 Section Ten - Telescope System Diagnostics Boom will not retract from ground control 143 Boom will not retract from platform control (ground control ok) 143 Boom will not extend from ground control 144 Boom will not extend from platform control (ground control ok) 144 Boom drifts in 144 Section Eleven - Fuel System Diagnostics Engine will not start on gasoline, but will start on L.P. 159 Engine will not start on L.P., but will start on gasoline 159 5

SYMPTOM PAGE NUMBER Section Twelve - Accessories Diagnostics AC Generator will not function 167 AC Generator has low voltage 167 Machine will not steer 167 6

SECTION ONE: ENGINE DIAGNOSTICS

SECTION ONE ENGINE DIAGNOSTICS Chart 1 Engine starter fails to operate (No Electrical) Battery and Cable Connections Power Cables and Battery Disconnect Switch 13 13 Step 3 Ammeter 14 Step 4 Ground Control Circuit Breaker (25 Amp) Step 5 Step 6 Emergency Stop Switch Ground Master (Key) Switch 14 15 15 Step 7 Step 8 Ignition/Emergency Power Switch Ground/Platform Selector Switch 16 16 Step 9 Engine Anti-Restart Relay (Ford Only) 0 Engine Starter Relay 17 17 1 Starter Solenoid 18 Troubleshooting Guide 9 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Chart 2 Starter disengages before engine starts (Ford Only) Engine Anti-Restart Relay Starter Solenoid 19 19 Chart 3 Engine cranks over but will not start Ground Master (Key) Switch Ground/Platform Selector Switch Step 3 Ignition/Emergency Power Switch 20 20 21 Step 4 Run Relay 21 Step 5 Magnetic Switch (Ford only) 22 Step 6 Magnetic Switch (Kubota only) 22 Step 7 Run Solenoid (Kubota only) 23 Troubleshooting Guide 10 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Chart 4 Engine starts then shuts down after 30 seconds Engine Temperature Gauge Engine Oil Pressure Switch (Ford Only) Step 3 Engine Oil Pressure Switch (Kubota Only) 24 24 25 Chart 5 Engine will not accelerate (Ford Only) Throttle Circuit Breaker (15 Amp) Medium Throttle Relay 26 26 Step 3 High Throttle Relay 27 Step 4 Throttle Governor or Controller 27 Step 5 Actuator 28 Chart 6 Engine will not accelerate (Kubota Only) Step 6 Fuse (10 Amp) 29 Throttle Relay 29 Step 7 Throttle Solenoid 30 Troubleshooting Guide 11 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Chart 7 Engine over accelerates (Ford Only) Governor 31 Actuator 31 Chart 8 Engine will not start from platform control Ground/Platform Selector Switch Platform Control Circuit Breaker (20 Amp) Step 3 Emergency Stop Switch 32 32 33 Step 4 Foot Switch 33 Step 5 Step 6 Platform Start Switch Ignition/Emergency Power Switch 34 34 Chart 9 Engine starts while cranking, then dies when key switch is released Run Solenoid 35 Run Relay 35 Troubleshooting Guide 12 UNO 33/ 41 4X4

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) low or no voltage Using a meter set to read voltage, check each battery for 12 volts while under load 12V corroded Check battery connections loose Power Cables and Battery Disconnect Switch Battery Disconnect Switch in Off Position Then Reset Battery Disconnect Switch to On Position Go to step 3 Clean all connections 12-12.7V Using a meter set to read voltage, measure voltage entering Battery Disconnect Switch Should read 12-12.7 volts 12-12.7V Using a meter set to read voltage, turn Battery Disconnect Switch to On position, measure voltage coming out of Battery Disconnect Switch Should read 12-12.7 volts low or no reading Tighten all connections Battery Disconnect Switch and/or Battery Disconnect Switch wiring Troubleshooting Guide 13 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Ammeter 12-12.7V Using a meter set to read voltage, measure voltage between 1.Battery Disconnect Switch and Ammeter (+) on wire # 57 2.Ammeter (-) and Circuit Breaker on wire #1A Should read 12-12.7 volts low or no reading Step 3 Step 4 Go to step 4 Ground Control Circuit Breaker (25 Amp) Circuit breaker is open Circuit Breaker and/or Circuit Breaker wiring Using a meter set to read voltage, turn Battery Disconnect Switch to On position, measure voltage entering Emergency Stop Switch Should read 10-12 volts low or no reading Then Reset Circuit breaker 10-12V Check for voltage between Circuit Breaker and Emergency Stop Switch on wire #1A Should read 12 volts Go to step 5 low or no reading Circuit Breaker and/or Circuit Breaker wiring Troubleshooting Guide 14 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Emergency Stop Switch Emergency Stop Switch is off (pushed in) Then Pull Emergency Stop Switch (out) to the On position Go to step 6 10-12V Using a meter set to read voltage, pull Emergency Stop Switch out and measure voltage between Emergency Stop Switch and Battery side of Ground Master (Key) Switch. Should read 10-12 volts low or no reading Replace Emergency Stop Switch and/or Emergency Stop Switch wiring Step 5 Step 6 Ground Master (Key) Switch Ford Go to step 7 Kubota Go to step 8 10-12V Using a meter set to read voltage, activate engine starter and measure voltage between Battery post side of Ground Master Switch and start side of Ground Master Switch. Should read 10-12 volts low or no reading Ground Master Switch and/or Ground Master Switch wiring Troubleshooting Guide 15 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Ignition/Emergency Power Switch Ford Go to step 8 Kubota Go to step 10 10-12V Using a meter set to read voltage, activate engine starter and measure voltage between Ground Master Switch and Ignition/Emergency Power Switch Should read 10-12 volts low or no reading Step 7 Step 8 Ground/Platform Selector Switch Ground/Platform Selector Switch is in Platform position Then Replace Ignition/Emergency Power Switch and/or Ignition/Emergency Power Switch wiring Set Selector Switch to Ground position. Using a meter set to read voltage, activate starter and measure voltage between Ignition/Emergency Power Switch and Ground/ Platform Selector Switch Should read 10-12 volts Return Ground/ Platform Selector Switch to Ground position Ford Go to step 9 Kubota Go to step 7 10-12V low or no reading Replace Ground/Platform Selector Switch and/or Ground/Platform Selector Switch wiring Troubleshooting Guide 16 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine Anti- Restart Relay (Ford only) Replace wiring to Engine Anti Restart Relay low or no reading Using a meter set to read voltage, activate engine starter and measure voltage between Ground Control Switch and Anti-Restart Relay on wire #5C. Should read 10-12 volts 10-12v Go to step 10 10-12v Measure voltage at wire #5B. Should read 10-12 volts low or no reading Step 9 Replace Engine Anti- Restart Relay still does not engage Check Adjustable Resistor between Terminal 164 and 164B. Adjust as needed for starter to engage. 0 Continuity Engine Starter Relay Check ground continuity No continuity Replace Engine Starter Relay 10-12V Using a meter set to read voltage, activate engine starter and measure voltage from 1. Ford: wire #5B to Starter Relay. Kubota: wire #5A to Starter Relay. 2. wire from Starter Relay to Ground Should read 10-12 volts Go to step 11 low or no reading Replace Engine Starter Relay wiring Troubleshooting Guide 17 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Continuity Starter Solenoid Check ground continuity No continuity Replace Starter Solenoid 10-12V Using a meter set to read voltage, activate engine starter and measure voltage from 1. Ford: wire #5A to Starter Solenoid Kubota: wire #165 to Starter Solenoid 2. Starter Solenoid to Ground Should read 10-12 volts low or no reading 1 Return to step 1 Replace Starter Solenoid wiring Troubleshooting Guide 18 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Starter disengages before engine starts (Ford only) Engine Anti- Restart Relay Open field in alternator Continuity Adjust resistor for longer cranking time, until engine starts and alarm shuts off. (approx. 30 seconds) Continuity Disconnect wire 164B from Alternator. Check continuity between post and alternator case. No continuity Alternator Starter Solenoid Check ground continuity No continuity Replace Starter Solenoid Return to step 1 10-12V Locate the adjustable resistor between terminals #164 and #164B, remove the plastic covering. While activating the starter, slowly slide adjuster until cranking time is sufficient for starting engine. Replace the plastic covering. Using a meter set to read voltage, activate engine starter and measure voltage from 1. wire #5A to Starter Solenoid 2. Starter Solenoid to Ground Should read 10-12 volts low or no reading Replace Starter Solenoid wiring Troubleshooting Guide 19 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine cranks over but will not start Ground Master (Key) Switch Go to step 2 10-12V Using a meter set to read voltage, activate engine starter and measure voltage between Battery post side of Ground Master Switch and ignition side of Ground Master Switch. Should read 10-12 volts No reading Ground Master Switch and/or Ground Master Switch wiring reading is low Check Battery Ground/Platform Selector Switch Ground/Platform Selector Switch is in Platform position Then Return Ground/ Platform Selector Switch to Ground position 10-12V Set Selector Switch to Ground position. Using a meter set to read voltage, activate starter and measure voltage between Ignition/Emergency Power Switch and Ground/ Platform Selector Switch Should read 10-12 volts No reading Replace Ground/Platform Selector Switch and/or Ground/Platform Selector Switch wiring reading is low Go to step 3 Check Battery Troubleshooting Guide 20 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Ignition/ Emergency Power Switch Go to step 4 10-12V Using a meter set to read voltage, measure voltage entering Ignition/ Emergency Power Switch Should read 10-12 volts low or no reading Step 3 Replace Ignition/Emergency Power Switch and/ or Ignition/Emergency Power Switch wiring low or no reading Check voltage on diode wire between Ignition/ Emergency Power Switch and Ground/Platform Switch. Replace diode wire if faulty. Measure voltage entering Run Relay (wire #4A) Should read 10-12 volts Step 4 Run Relay Go to step 5 (Ford) Go to step 6 (Kubota) 10-12V Using a meter set to read voltage, measure voltage between Run Relay and Murphy Switch (B Post) wire #164 Should read 10-12 volts low or no reading Replace Ground/Platform Selector Switch and/or Ground/Platform Selector Switch wiring Troubleshooting Guide 21 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Magnetic Switch ( Ford only) Using a meter set to read voltage, measure voltage on wire 1. at post NC of Magnetic Switch 2. on wire 80A between Magnetic Switch and Governor Should read 10-12 volts Step 5 Step 6 Magnetic Switch ( Kubota only) low or no reading Replace Magnetic Switch and/or Magnetic Switch wiring Using a meter set to read voltage, measure voltage on wire #8D at post NC of Magnetic Switch Should read 10-12 volts low or no reading Replace Magnetic Switch and/or Magnetic Switch wiring Troubleshooting Guide 22 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Run Solenoid ( Kubota only) Using a meter set to read voltage, measure voltage at wire #8D to Run Solenoid Should read 10-12 volts Note: Check continuity to ground on white jumper wire low or no reading Step 7 Replace Run Solenoid Troubleshooting Guide 23 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine starts then shuts down after 30 seconds Engine Temp. Gauge Ford Go to step 2 Kubota Go to step 3 oil level is adequate Using a meter set to read ohms, Check continuity on wire between Murphy Switch (Black wire at S post) and Chassis ground resistance is shown Allow time for Engine to cool down Then Replace Murphy Engine Temperature Gauge Engine Oil Pressure Switch (Ford only) Engine oil pressure is due to inadequate oil level Then oil level is adequate no resistance is shown With the engine off, use a meter set to read ohms, check continuity between wire #3C and Ground wire at Engine Oil Pressure Switch resistance is shown Replace Engine Oil Pressure Switch Fill to proper level with oil Return to step 1 Troubleshooting Guide 24 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine Oil Pressure Switch (Kubota only) Engine oil pressure is due to inadequate oil level Then oil level is adequate engine does not start Jump wire #3A from Engine Oil Pressure Switch to ground, start engine engine starts and stay running Replace Engine Oil Pressure Switch Step 3 Fill to proper level with oil Return to step 1 Troubleshooting Guide 25 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine will not accelerate (Ford only) Throttle Circuit Breaker (15 Amp) Circuit breaker is open Then Reset Circuit breaker Using meter set to read voltage, measure voltage Ford: entering either Medium Throttle Relay wire #55A or High Throttle Relay wire #55B Deutz: on wire #55A between Throttle Relay and Throttle Solenoid Should read 10-12 volts low or no reading Go to step 2 (Ford) Go to step 6 (Deutz) continuity does exists Check continuity on wire #55 between Throttle Circuit Breaker and Medium Throttle Relay or High Throttle Relay continuity does not exists Circuit Breaker and/or Circuit Breaker wiring Medium Throttle Relay (Ford only) Go to step 3 10-12V Using a meter set to read voltage, measure voltage on wire #55A to Throttle Controller Should read 10-12 volts low or no reading Check continuity on wire between Medium Throttle Relay and Throttle Controller Then wiring from Medium Throttle Relay to Throttle Controller Troubleshooting Guide 26 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS High Throttle Relay (Ford only) Go to step 4 10-12V Using meter set to read voltage, measure voltage on wire #55B to Throttle Controller Should read 10-12 volts low or no reading Check continuity on wire between High Throttle Relay and Throttle Controller Then Step 3 wiring from High Throttle Relay to Throttle Controller Step 4 Electronic Governor (Ford only) Go to step 5 10-12V Using a meter set to read voltage, measure voltage on wire #55A and #55B going into the Electronic Governor Should read 10-12 volts low or no reading wiring to Electronic Governor Troubleshooting Guide 27 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Actuator Electronic Governor 10-12V Using a meter set to read voltage, measure voltage, on wire #A1 and #A2 between the Electronic Governor and Solenoid Should read 10-12 volts low or no reading Step 5 Electronic Governor and/or wiring Troubleshooting Guide 28 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine will not accelerate (Kubota only) Fuse (10 Amp) Go to step 2 10-12V Verify if fuse is blown blown Replace Fuse Throttle Relay (Kubota only) wiring between Fuse and Throttle Relay Replace Relay low or no reading low or no reading Using a meter set to read voltage, measure voltage on wire #13D between Fuse and Throttle Relay Should read 10-12 volts 10-12V Activate Ground Control Switch and measure voltage on wire #140 to Throttle Solenoid Should read 10-12 volts Ok Go to step 3 Troubleshooting Guide 29 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Throttle Solenoid Using a meter set to read voltage, measure voltage on wire #14D into Throttle Solenoid Should read 10-12 volts low or no reading Step 3 Throttle Solenoid and/or Throttle Solenoid wiring Troubleshooting Guide 30 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine over accelerates (Ford only) Electronic Governor Go to step 2 10-12V Using a meter set to read voltage, measure voltage, on wire #55A and #55B going into the Electronic Governor Should read 10-12 volts low or no reading Actuator Electronic Governor 10-12V Ford: wiring to Electronic Governor Using a meter set to read voltage, measure voltage on wire #A1 and #A2 between the Electronic Governor and Actuator Should read 10-12 volts low or no reading Electronic Governor and/or wiring Troubleshooting Guide 31 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine will not start from platform control Ground/Platform Selector Switch Ground/Platform Selector Switch is in Ground position Then Set Selector Switch to Platform position. Using a meter set to read voltage, activate starter and measure voltage between Ignition/Emergency Power Switch and Ground/ Platform Selector Switch Should read 10-12 volts Return Ground/ Platform Selector Switch to Platform position Go to step 2 Platform Control Circuit Breaker (20 Amp) Circuit Breaker is open 10-12V low or no reading Replace Ground/Platform Selector Switch and/or Ground/Platform Selector Switch wiring Using a meter set to read voltage, turn Ground/ Platform Switch to Platform position, measure voltage on wire #1 and #2 entering Platform Control Circuit Breaker Should read 10-12 volts Then Reset Circuit Breaker Go to step 3 Replace Circuit Breaker 10-12V low or no reading 10-12V Check for voltage on wire #1B to Emergency Stop Switch Should read 10-12 volts Wire #1 and/or #2 low or no reading Troubleshooting Guide 32 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Emergency Stop Switch Emergency Stop Switch is off (pushed in) 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 10-12 volts Then low or no reading Step 3 Pull Emergency Stop Switch (out) to the on position Go to step 4 10-12V Replace Emergency Stop Switch and/or Emergency Stop Switch wiring Step 4 Foot Switch and Wiring Make sure Foot Switch is not activated activated Go to step 5 not activated 10-12V Deactivate Foot Switch 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 10-12 volts low or no voltage Foot Switch and/or wiring Troubleshooting Guide 33 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Platform Start Switch Go to step 6 10-12V Using a meter set to read voltage, activate Platform Start Switch and measure voltage on wire #5 between Platform Start Switch and Platform Emergency Power Switch Should read 10-12 volts low or no reading Replace Platform Start Switch and/or Platform Start Switch wiring Step 5 Step 6 Ignition/Emergency Power Switch Return to step 1 10-12V Using a meter set to read voltage, activate engine starter and measure voltage on wire #5 between Platform Master Switch and Ignition/Emergency Power Switch Should read 10-12 volts low or no reading Replace Ignition/Emergency Power Switch and/or Ignition/Emergency Power Switch wiring Troubleshooting Guide 34 UNO 33/ 41 4X4

SECTION ONE ENGINE DIAGNOSTICS Engine starts while cranking, then dies when key switch is released Run Relay Go to step 2 10-12V Using a meter set to read voltage, measure voltage at Murphy Switch wire #164, B post of Murphy Switch Should read 10-12 volts low or no reading Run Solenoid Run Relay and/or Run Relay wiring Using a meter set to read voltage, measure voltage on wire #8D between Run Solenoid Murphy Switch Should read 10-12 volts Note: Check continuity to ground on white jumper wire low or no reading Replace Run Solenoid and/or Run Solenoid wiring Troubleshooting Guide 35 UNO 33/ 41 4X4

SECTION TWO: HYDRAULIC DIAGNOSTICS

SECTION TWO HYDRAULICS DIAGNOSTICS Chart 1 Hydraulic system functions on emergency power only Main Hydraulic Pump Sense Line Dump Valve 41 41 Chart 2 Hydraulic pump stays on stroke Pump Compensator 42 Chart 3 Hydraulic functions are sluggish Engine RPM 43 Pump Pressure 43 Step 3 Accumulator 44 Step 4 Flow from Pump 44 Chart 4 Hydraulic pump will not build pressure Pump Compensator Valve Pump Coupling 45 45 Troubleshooting Guide 39 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Chart 5 Hydraulic pump will not build enough pressure Pump Compensator Valve Senseline Dump Valve 46 46 Chart 6 Flow from hydraulic pump is too low Flow Adjustment on Main Hydraulic Pump 47 Chart 7 Flow from hydraulic pump is too high (kills engine) Flow Adjustment on Main Hydraulic Pump 47 Troubleshooting Guide 40 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic system functions on emergency power only Main Hydraulic Pump Remove gauge and Go to step 2 250-300 psi Install 1000 psi pressure gauge to hydraulic pump test plug. Set engine for idle and measure differential/standby pressure. Should read 250-300 psi Ok Replace Main Hydraulic Pump and/or Pump Coupling and/or Pump Compensator Sense Line Dump Valve Check seals on Sense Line Dump Valve bad Sense Line Dump Valve Go to step 3 malfunctioning 10-12V reading is abnormal Check Main Hydraulic Pump, Pump Coupling and Pump Compensator Using a meter set to read voltage, activate Ground Control Switch and measure voltage 1.on wire #28B between Terminal Strip in Junction Box and Sense Line Dump Valve 2.on wire # 28B at Sense Line Dump Valve Should read 10-12 volts low or no reading Sense Line Dump Valve and/or wiring Troubleshooting Guide 41 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic pump stays on stroke Pump Compensator Valve Check seals on Sense Line Dump Valve bad goes off stroke Remove hose from compensator. Recheck pressure on Pump. stays on stroke Pump Compensator Sense Line Dump Valve Troubleshooting Guide 42 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic functions are sluggish Engine RPM Go to step 2 correct RPM Use a Tachometer to measure Engine RPM Should read: Ford - 1050 RPM at Low 2100 RPM at Mid 2800 RPM at High Kubota -1500-1800 RPM at Low 3200 RPM at High not Adjust Throttle Actuator or Solenoid Pump Pressure Remove gauge and Go to step 3 300 psi Install 1000 psi pressure gauge at Test Port. Set engine for idle and measure standby pressure. Should read 250-300 psi low or no reading Adjust Pump Compensator Troubleshooting Guide 43 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Accumulator Measure the charge on the Accumulator Should be 750 to 800 psi 750 to 800 psi low or no reading Step 3 Go to step 4 Recharge Accumulator Step 4 Flow from Pump Remove gauges and Return to step 1 12 to 14 gpm and 300 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 1000 psi pressure gauge at Test Port on Accumulator. Start engine and turn Throttle Switch to high. Activate drive function full on. Flowmeter should read 12 to 14 gpm and pressure gauge should read 300 psi low or no reading Adjust Flow Ajustment Troubleshooting Guide 44 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic pump will not build pressure Pump Compensator Valve Go to step 2 no reading Remove hoses from Sense Line Dump Valve to Compensator Valve and reattach to Pressure Line. Using a 5000 psi pressure gauge check pressure. Should read 2400 psi 2800 psi Remove gauge and check seals on Sense Line Dump Valve bad Pump Coupling Sense Line Dump Valve Remove Main Hydraulic Pump visually check Pump Coupling bad Ok Pump Coupling Compensator and/or Main Hydraulic Pump Troubleshooting Guide 45 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Hydraulic pump will not build enough pressure Pump Compensator Valve Go to step 2 Adjust Compensator Valve no reading low reading Remove hoses from Sense Line Dump Valve to Compensator Valve and reattach to Pressure Line. Using a 5000 psi pressure gauge check pressure. Should read 2800 psi 2800 psi Remove gauge and check seals on Sense Line Dump Valve bad Sense Line Dump Valve Sense Line Dump Valve Check seals on Sense Line Dump Valve bad Sense Line Dump Valve 10-12V Using meter set to read voltage, activate Ground Control Switch and measure voltage 1. On wire #28B between Terminal Strip in Junction Box and Sense Line Dump Valve 2. On wire # 28B at Sense Line Dump Valve Should read 10-12 volts low or no reading Sense Line Dump Valve wiring Troubleshooting Guide 46 UNO 33/ 41 4X4

SECTION TWO HYDRAULICS DIAGNOSTICS Flow from hydraulic pump is too low Flow Adjustment on Main Hydraulic Pump Visually check Flow Adjustment Screw on Main Hydraulic Pump Screw should extend between 3/4" and 7/8" from face of pump 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 between 3/4" and 7/8" from face of pump Reset Flow Adjustment on Main Hydraulic Pump Troubleshooting Guide 47 UNO 33/ 41 4X4

SECTION THREE: STEERING SYSTEM DIAGNOSTICS

SECTION THREE STEERING SYSTEM DIAGNOSTICS Chart 1 Machine will not steer Steer Switch 52 3 Way Valve 52 Step 3 Boom Speed Dial 53 Step 4 Steer Control Valve 53 Step 5 Center Post 54 Step 6 Tow Package Float Valve 54 Troubleshooting Guide 51 UNO 33/ 41 4X4

SECTION THREE STEERING SYSTEM DIAGNOSTICS Machine will not steer 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 Switch Go to step 2 10-12V Using a meter set to read voltage, activate Steer Right Switch and measure voltage on wire #20 between Steer Switch and Steer Control Valve. Activate Steer Left Switch and measure voltage on wire #19. Should read 10-12 volts low or no reading Replace Steer Switch and/or Steer Switch wiring Blocking Valve Switch and/or wiring low or no reading Using a meter set to read voltage, activate Steer function and measure voltage on wire #160 between Steer Switch and 3-Way Valve Should read 10-12 volts 10-12V Visually check Blocking Valve Cartridge for binding Ok Should normally be closed. stuck Go to step 3 Blocking Valve Cartridge Troubleshooting Guide 52 UNO 33/ 41 4X4

SECTION THREE STEERING SYSTEM DIAGNOSTICS Boom Speed Dial Turn to full speed not full speed Visually check Speed Dial for full speed full speed Note: At this point the manual override may also be use to isolate the solenoid, however use caution as the machine will be moving. Replace Speed Dial in Platform Replace Valve steer ok stuck Remove wire #16B from By-Pass Coil on Main Hydraulic Valve and retry function no change Remove By-Pass Valve from Main Valve and inspect. Valve is normally closed Ok Go to step 4 Ok Activate Manual Override on Valve while activating Steer function function does not operate Step 3 Step 4 Steer Control Valve approx. 2400 psi Go to step 5 Activating Manual Overrides and check pressure Should be 2400 psi Steer Control Valve or Solenoid Go to Step 5 lower than 2400 psi Troubleshooting Guide 53 UNO 33/ 41 4X4

SECTION THREE STEERING SYSTEM DIAGNOSTICS During activation of steering function the machine will be moving. Center Post Steer Cylinder Note: Machines with optional Tow Package go to step 6 reading is normal Remove hoses leading to Steer Cylinder Plug hoses and cap the Steer Cylinder. While activating steering function, check for 2400 psi at the pump pressure Test Port reading is abnormal Center Post Step 5 Step 6 Tow Package Float Valve Refer to Chapter 12 Accessories Diagnostics Troubleshooting Guide 54 UNO 33/ 41 4X4

SECTION FOUR: DRIVE SYSTEM DIAGNOSTICS

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 1 Drive system is not operational with controller in either direction Foot Switch 61 Drive Fuse 61 Step 3 Controller Circuit Board and S1 Micro Switch Wiring 62 Step 4 S1 Micro-Switch (in Controller) 62 Step 5 Controller Circuit Board 63 Step 6 Potentiometer 63 Step 7 S2 Micro-Switch (in Controller) 64 Step 8 Drive Solenoid 64 Step 9 Drive Control Valve 65 0 Center Post 65 1 Dual Counterbalance Valve 66 Troubleshooting Guide 57 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 2 No forward drive (reverse ok) S2 Micro-Switch (in Drive Controller) Drive Controller Circuit Board Step 3 Solenoid (Drive Forward on Control Valve) Step 4 Dual Counterbalance Cartridge 67 67 68 68 Chart 3 No reverse drive (forward ok) S2 Micro-Switch (in Drive Controller) Drive Controller Circuit Board Step 3 Solenoid Valve (Drive reverse on Control Valve) Step 4 Dual Counterbalance Cartridge 69 69 70 70 Troubleshooting Guide 58 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 4 Drive high range not operating (mid speed ok) Step 3 Drive Range Switch Boom Position and/or Boom Limit Switch 2 Wheel Motor Shift Valve Step 4 3-Way Cartridge Valves in Transmission Valve 71 71 72 72 Chart 5 Drive mid range not operating (low speed ok) Drive Range Switch 73 Boom Limit Switch 73 Step 3 Steer Limit Switches 74 Step 4 Left and Right Motor Shift Valves Step % Power to R Terminal on Controller 74 75 Chart 6 Wheels on one side rotate faster than on other side Drive Range Switch Boom Limit Switch 76 76 Troubleshooting Guide 59 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Chart 7 One wheel rotates slower than others 3-Way Cartridge Valves Flow Divider (spool type) 78 78 Wheel Motors 79 Chart 8 Brakes will not release Brake Pressure 80 Troubleshooting Guide 60 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive system is non-operational with controller in either direction Foot switch Go to step 2 10-12V Using a meter set to read voltage, activate Foot Switch and measure voltage 1. on wire #9 between Foot Switch and Drive Fuse 2. at 3 amp Drive Fuse Should read 10-12 volts Drive Fuse (3 amp) Go to step 3 10-12V low or no voltage Replace Foot Switch and/or Foot Switch wiring Using a meter set to read voltage, activate Foot Switch and measure voltage 1. on wire # between Drive Fuse and Drive Controller 2. at positive (+) post of Drive controller Should read 10-12 volts low or no voltage Replace Foot Switch and/or Foot Switch wiring Troubleshooting Guide 61 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Controller Circuit Board and S1 Micro-Switch Wiring Go to step 4 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 10-12 volts low or no voltage Step 3 Replace Circuit Board and/or S1 Micro-Switch wiring Step 4 S1 Micro-Switch (in Controller) lit Move controller handle in either direction and observe red LED on Circuit Board Controller Go to step 5 not lit Replace S1 Micro-Switch (in Controller) and/or S1 Micro-Switch wiring Go to step 5 low or no voltage 10-12V 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 10-12 volts Troubleshooting Guide 62 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Controller Circuit Board Go to step 6 10-12V Using a meter set to read voltage, 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 10-12 volts low or no voltage Step 5 Step 6 Potentiometer Go to step 7 continuity Replace Controller Circuit Board and/or Controller Circuit Board wiring 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 Replace Potentiometer and/or Potentiometer wiring No continuity no reading Check continuity on wire between Controller Circuit Board and Potentiometer Troubleshooting Guide 63 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Step 7 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 8 no reading Ok 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 Step 8 Drive Solenoid Go to step 9 functions are normal Push Manual Override while activating various controller functions and check operation. functions are abnormal or erratic Replace Drive Section Control Valve Troubleshooting Guide 64 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive Control Valve Remove gauge and Go to step 10 functions are normal Remove hoses from drive section of Control Valve. Plug the hoses and cap valve. Install a 5000 psi pressure gauge to Pump Test Port. While activating drive control function, check pressure. Should read 2400 psi (while activating function) functions are abnormal or erratic Step 9 Replace Valves on Drive Section of Control Valve 0 Center Post Remove gauge and Go to step 11 pressures are normal Remove hoses at V1 and V2 ports of Dual Counterbalance Valve. Plug hoses and cap valve. Install a 5000 psi pressure test gauge to Pump Test Port While activating drive control function, check pressure. Should read 2400 psi (while activating function) pressures are abnormal or erratic Center Post Troubleshooting Guide 65 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Dual Counterbalance Valve Replace Dual Counterbalance Valve, and retry function still no function 1 Return to step 1 Troubleshooting Guide 66 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS No forward drive (Reverse Ok) S2 Micro-Switch (in Drive Controller) Go to step 2 normal 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. Replace S2 Micro-Switch and/or S2 Micro-Switch wiring Drive Controller Circuit Board Go to step 3 no continuity normal low or no reading Check continuity on blue wire between S2 Micro- Switch and Controller Circuit Board 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. no or erratic reading Replace Drive Controller Circuit Board Troubleshooting Guide 67 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Solenoid Valve (Drive forward on Control Valve) Using a meter set to read voltage. While activating forward function, measure proportional voltage at wire #17 on Drive section of Control Valve. Reading should vary according to controller movement. no reading Try manual override Override allows operation Step 3 Go to step 4 Override does not allow operation Replace Drive Forward Solenoid Valve and/or Drive Forward Solenoid Valve wiring Step 4 Dual Counterbalance Valve Cartridge Return to step 1 0-500 psi Using a 5000 psi pressure test gauge activate drive function and check system pressure at hose entering port C2 on Counterbalance Valve Should read 0-500 psi pressure reading is high Replace the Dual Counterbalance Valve Cartridge tested Troubleshooting Guide 68 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS No reverse drive (Forward Ok) S2 Micro-Switch (in Drive Controller) Go to step 2 normal 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. Replace S2 Micro-Switch and/or S2 Micro-Switch wiring No continuity low or no reading Check continuity on white wire between S2 Micro- Switch and Controller Circuit Board Drive Controller Circuit Board Go to step 3 normal 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 no or erratic reading Replace Drive Controller Circuit Board Troubleshooting Guide 69 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Machine function will be moving when manual override is activated. Solenoid Valve (Drive reverse on Control Valve) Using a meter set to read voltage. While activating reverse function, measure proportional voltage at wire #18 on Drive section of Control Valve. Reading should vary according to controller movement. no reading Try manual override Step 3 Step 4 Go to step 4 Dual Counterbalance Valve Cartridge Return to step 1 Override does not allow operation 0-500 psi Override allows operation Replace Drive Reverse Solenoid Valve and/or Drive Reverse Solenoid Valve wiring Using a 5000 psi pressure test gauge activate drive function and check system pressure at hose entering port C1 on Counterbalance Valve Should read 0-500 psi pressure reading is high Replace the Dual Counterbalance Valve Cartridge tested Troubleshooting Guide 70 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive high range not operating (mid speed ok) Note: High speed only works in forward direction Drive Range Switch Go to step 2 Adjust Micro- Switch Measure voltage from Micro Switch to Drive Range Switch. should read 10-12 volts when driving full forward low or no reading not Ok 10-12V Using a meter set to read voltage, measure voltage on wire #70B going into the R Terminal of Drive Controller Should read 10-12 volts 10-12V Check Hi Speed Micro- Switch on controller. should trip at 80% forward movement. Measure voltage on wire #170 coming out of the Drive Range Switch. Should read 10-12 volts low or no reading 10-12V low or no reading Replace Switch Go to step 3 Replace Drive Range Switch and/or wiring Boom Position and/or Boom Limit Switch Booms are not positioned for High Range speed operations Boom Limit Switch are not Adjusted Position Booms to fully down position. Adjust Boom Retract/Down Limit Switch Boom Up Limit Switch and/or wiring no voltage still not operating Check for 10-12 volts on wire #70 at Boom Up Limit Switch 10-12V Wiring to R Terminal of Drive Controller Troubleshooting Guide 71 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS 2 Wheel Motor Shift Valve Using meter set to read voltage, measure voltage at 2 Wheel Motor Shift Coil wire #170. Should read 10-12 volts no reading 10-12V Wiring to Shift Coil Step 3 Remove valve and check for stuck Valve or blown O'Rings bad as needed pressure is high Using a 5000 psi pressure gauge, measure pressure on hose between 2 Wheel Motor Shift Valve and Center Post. Should read 0 psi Ok Go to step 4 Step 4 3-Way Cartridge Valve in Transmission Valve Go to step 5 Ok Verify that Valves are shifting by Removing valve and checking for movement. not moving 3-Way Cartridge Valve in Transmission Valve Troubleshooting Guide 72 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Drive mid range not operating (low speed ok) Drive Range Switch Go to step 2 0V Using a meter set to read voltage, measure voltage on wire #11 on Drive Range Switch Should read 0 volts with switch in Mid Speed voltage Replace Switch with Part # 302-0017 only Boom Limit Switch Go to step 3 0V With booms down, use a meter set to read voltage, measure voltage on wire #34 of Boom Limit Switch Should read 0 volts voltage Repair, replace or adjust Boom Limit Switch Troubleshooting Guide 73 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Steer Limit Switches Readjust Switches Go to step 4 activated activated With tires straight, check switches on steering to verify if activated or not activated Switches should not be activated not activated Using a meter set to read voltage, measure voltage on wire 34L on left Motor Shift Valve and on 34R on right Motor Shift Valve Should read 0 volts voltage Step 3 Steer Switches Step 4 Left and Right Motor Shift Valves Go to step 5 Ok Install a 5000 psi pressure gauge in line with Port B1 (for right) or B2 (for left) of Drive Shift Valve. Should read same pressure as on compensator of Pump or Drive Pressure low or no pressure Repair, replace Motor Shift Valves Troubleshooting Guide 74 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Power to R Terminal Check connection on Boom Wire between Boom Switches and Platform low With Boom retracted and lowered, use a meter set to read voltage, measure voltage at the R Terminal of Drive Controller Should read 10-12 volts no reading Return to step 1 10-12V Adjust High Speed Trim Pot on controller to get 3 mph = 100 ft in 22 sec. Step 5 Troubleshooting Guide 75 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Wheels on one side rotate faster than other side Note: In mid and high only. Steer Limit Switches Readjust Switches activated With tires straight, check switches on steering to verify if activated or not activated Switches should not be activated not activated Go to step 2 activated Using a meter set to read voltage, measure voltage on wire 34L on left Motor Shift Valve and on 34R on right Motor Shift Valve Should read 0 volts voltage Steer Switches Left and Right Motor Shift Valves Go to step 3 Ok Install a 5000 psi pressure gauge in line with Port B1 (for right) or B2 (for left) of Drive Shift Valve. Should read same pressure as on compensator of Pump or Drive Pressure low or no pressure Repair, replace Motor Shift Valves Troubleshooting Guide 76 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Step 3 Wheel Motor Go to Chart 8 less than.5 gpm Remove Case Drain Hose from slow motor, install flowmeter in line. Drive machine and read flowmeter. Should read less than.5 gpm more than.5 gpm Replace Motor Troubleshooting Guide 77 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS One wheel rotates slower than others Note: In mid range forward only. 3-Way Cartridge Valves Go to step 2 Ok Front Left Wheel or Rear Right Wheel Remove 3-way Cartridge Valves from Right Transmission Valve. for shifting or blown o'rings Front Right Wheel or Rear Left Wheel Remove 3-way Cartridge Valves from Left Transmission Valve. for shifting or blown o'rings bad as needed flow Divider (Spool type) Go to step 3 Ok Front Left Wheel or Rear Right Wheel, remove Flow Divider from right Transmission Valve. for broken springs or scratches on Valve Front Right Wheel or Rear Left Wheel, remove Flow Divider from left Transmission Valve. for broken springs or scratches on Valve bad as needed Troubleshooting Guide 78 UNO 33/ 41 4X4

SECTION FOUR DRIVE SYSTEM DIAGNOSTICS Brakes will not release Brake Pressure 1. Install a 5000 psi pressure gauge in Brake Port Drive Motor 2. Take pressure reading at Pump Compensator Readings should be similar Brake Orifice located in Bulk Head Fitting going to Brake Troubleshooting Guide 80 UNO 33/ 41 4X4