TABLE OF CONTENTS. Tow Behind Bulk Bin Brake Release Procedure... H-3. General Hydraulic Repair Procedure... H-4

Transcription

1 TABLE OF CONTENTS Tow Behind Bulk Bin Brake Release Procedure... H-3 General Hydraulic Repair Procedure... H-4 Hydraulic Component Maintenance Schedule... H-5 Pressure Settings... H-6 Hydraulic Power Pack Components... H-7 Hydraulic Reservoir / Oil Level... H-8 Suction Line Filter... H-9 Replacing the Hydraulic Pump...H Volt DC Hydraulic Power Unit Pressure Relief Valve...H-13 Bulk Bin DOWN Flow Control Valve...H-15 Bulk Bin Tilt Check Valve Pilot Operated...H-16 Wedge Check Valve Pilot Operated...H-17 Troubleshooting General...H-18 Troubleshooting Guide...H-20 Post Troubleshooting...H-21 DRAWINGS (In order of appearance) FUNCTIONAL SCHEMATICS S/N and Above DWG JUNE/2013 ( ) H-1

2 Tow Behind Bulk Bin Release/Revisions Release/Rev Date Change Description Rev. A 6/15/2013 First Release Section H-2 JUNE/2013 ( )

3 Tow Behind Bulk Bin Brake Release Procedure CX Hammer to Tow Behind Bulk Bin Quick Connect Location The spring applied/hydraulic released brakes on the tow behind bulk bin are operated by the operators via the spike machine s brake hydraulic circuit. There is a hydraulic quick disconnect hose connecting the two machines brake circuits. If towing the Tow Behind Bulk Bin machine with another machine other than a Nordco Spike machine use the following procedure to release the spring applied brakes. Install a tow bar between the towing machine to the front of tow behind bulk bin and apply parking brakes on the towing machine. Turn off engine/hydraulic pump (towing machine). Chock wheels to prevent movement. Using hydraulic fittings and/or hoses connect the Tow Behind Bulk Bin quick connect brake hydraulic hose to a hydraulic pressure port on the tow machine. Start the tow machine and engaged the hydraulic pump until the hydraulic brake cylinders have collapsed and the brakes are released enough to insert the brake lock pins. Have someone install two brake lock pins (1) and hair pin cotters (2) on the two brake cylinder assemblies. Turn the brake lock-off valve to the OPEN position and verify that the brake shoes are locked OFF with pins inserted on 2 wheels (only one axle has brakes). If any of the brake shoes stay in contact with a wheel, the cage bolt needs to be adjusted. Follow the procedure listed in Nordco Spiker / Hammer Operation & Maintenance Manual emergency brake release. JUNE/2013 ( ) H-3

4 Tow Behind Bulk Bin GENERAL REPAIR PROCEDURES Follow the procedures established for your company s lockout/tagout procedures of energy isolating devices whenever maintenance is done. It has to be done before performing any repairs where release of pressurized hydraulic oil or unexpected start-up of the machine could cause injury. See LOCKOUT/TAGOUT REQUIREMENTS in the Safety Section of the Operating Maintenance Manual for a chart on energy sources located on this machine. Only trained and authorized personnel should be allowed to operate and / or repair of the tow behind bulk bin. If you are unsure of any of the tasks listed in this document, consult your Supervisor and always refer to the Operating and Maintenance Manual for the tow behind bulk bin. For tasks beyond a machine operator s knowledge, experience and training, the machine operator must seek assistance from a supervisor, a trained mechanic, or other qualified person. Prior to performing any maintenance conduct a job briefings with any additional persons involved including those on adjacent equipment. There is a danger of scalding when working with hydraulic oil that has reached operating temperature. Serious personal injury or death may result if hydraulic oil penetrates the skin. Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. All hydraulic circuit repairs should be performed with the machine s cylinders retracted and the wheels chocked. Always turn off the 24 volt hydraulic power unit when performing maintenance, making adjustments, or whenever unintended movement of machine could occur; unless directed otherwise. Tighten all connections before applying pressure. Protect hands and body from high pressure fluids. If an accident occurs, see a doctor immediately. The following procedure is designed to lead the operator / mechanic through the steps required to shut the machine down and prepare it for performing mechanical maintenance work. This procedure is intended to release stored hydraulic pressure to make the machine safe to begin repairs. 1. Lower the bulk bin cylinder. 2. Turn the battery disconnect switch to the OFF position and close, secure and tag the battery box. 3. Manually shift the hydraulic directional control valve for each circuit that is to be worked on to relieve the trapped hydraulic oil pressure! 4. Use caution and crack each hose fittings (1/8 1/4) of a turn (CCW) at the hydraulic cylinder or motor (being worked on) to allow any pressurized oil to bleed off slowly before removing hose. Section H-4 JUNE/2013 ( )

5 COMPONENT MAINTENANCE SCHEDULE Hydraulic Component Maintenance Schedule Item 10 Hours (Day) 50 Hours (Week) 150 Hours (Month) 500 Hours (3 Months) 2000 Hours (6 Months) Hydraulic Oil Level I/F Oil Cleanliness I I/T Check hoses & fittings for leaks I I I Test hydraulic oil cleanliness I/R Replace tank breather I/R Drain & replace oil in hydraulic tank I/R Inspect suction strainer element I/R Key: Some maintenance requires that a two step procedure be performed. For example, I/F require inspection and Filling. A = Adjust C = Change CL = Clean I = Inspect L = Lube R = Replace S = Service T = Test F = Fill Hydraulic filters require inspection during the first 40 hours of service and at designated Intervals thereafter. Monthly pressure checks are recommended. Fluctuation of hydraulic power may require more frequent checks. JUNE/2013 ( ) H-5

6 Tow Behind Bulk Bin Pressure Settings GENERAL Pressure to the various devices in the tow behind bulk bin hydraulic system is controlled by the pressure relief valve. It is important for the proper operation of the machine that the pressure is maintained at the correct level as shown below. Adjustments may also be necessary anytime the machine is not operating normally. Test and adjust pressure as shown on the following page. PRESSURE SETTINGS & LOCATION SETTING LOCATION Pump Pressure Relief Valve: 2750 psi 24 Volt Hydraulic Power Unit Power Unit Pressure Relief Valve Section H-6 JUNE/2013 ( )

7 Hydraulic Power Pack Components JUNE/2013 ( ) H-7

8 Tow Behind Bulk Bin Hydraulic Reservoir - Oil Level Both cylinder rods must be fully retracted BEFORE checking and or adding hydraulic oil to the hydraulic reservoir. Topping off the hydraulic reservoir with cylinder rods EXTENDED will cause oil to flow out of the fill hole. At full level, the hydraulic oil should be ½ inch from the top to the top of the reservoir. Filler/Breather Check the hydraulic oil level, potential equipment failures are prevented by avoiding low or nonexistent oil level. Inspect the oil level on a daily basis (or every 10 hours of operation) by removing the filler / breather cap from the top of the reservoir. Check that the hydraulic oil is not contaminated with water or other materials. The Tow Behind Bulk Bin hydraulic system uses SAE-20 (ISO 46) oil (UNLESS OTHERWISE STENCILLED ON THE TANK). See recommend lubricants in the maintenance section of this manual. Before filling the system oil, be sure that the fluid is as specified and that it is clean. Do not use cloth strainers or fluid that has been stored in contaminated containers. Mixing hydraulic oils with different additive packages is never recommended. Doing so could compromise the additive performance of both constituents, cause corrosion of component surfaces and lead to increased mechanical wear. Care should be taken to keep the hydraulic oil free of dust, water, sealing compounds and other foreign matter. If oil becomes dark or milky colored, it should be changed as soon as possible. After filling the reservoir to ½ from the top of the reservoir, operate both directional control valves and extend the cylinder rods and then retract to bleed any air from the circuits. With both cylinder rods fully retracted and oil 1/2 from top of reservoir, install the reservoir filler/breather cap Do not replace the filler/breather cap with a solid plug or a fill cap without a breather element DO NOT OVERFILL THE RESERVOIR. Section H-8 JUNE/2013 ( )

9 Suction Line Filter Page 1 of 2 Reservoir O-Ring The procedures required when servicing a filter located inside the reservoir is a common reason why suction strainers go unserviced until the hydraulic pump fails. Follow the procedures established for your company s lock out/tag out procedures and lock out the 24 volt battery shut off switch in the OFF. Remove the filter / breather cap filter from the reservoir. Remove the drain plug at the bottom of the reservoir and drain the hydraulic oil into a container for proper disposal. Do NOT reuse this hydraulic oil! Hydraulic Oil Return Suction Line Screen & Tube Remove the six reservoir collar screws and remove the reservoir from the pump / 24 volt motor assembly. Note the orientation of the pump suction line screen / tube and hydraulic oil return line. Remove the pump suction line screen / tube from the pump suction plate. Wash the suction filter in a cleaning solvent and blow dry with compressed air. Inspect the cleaned suction filter mesh for any holes, perforation, rust or tears. If the suction filter looks out of shape or damaged, replace it. Clean-out the hydraulic reservoir with clean lint free cloths of hydraulic oil, residue, rust, flaking pain, and any other contaminates. Inspect the hydraulic reservoir both on the inside and outside for damage, rust, loose paint, other contaminates. If this is not done, when new hydraulic oil is added to the reservoir it will be contaminated immediately defeating the purpose of the fluid change. Install the suction filter inlet so that is facing the bottom of the reservoir. Check that the hydraulic oil return line is pointing toward the side wall of the reservoir (oil should not return directly toward bottom of reservoir). Check that the reservoir o-ring is not damage before applying a light coat of oil to it. JUNE/2013 ( ) H-9

10 Tow Behind Bulk Bin Suction Line Filter Page 2 of 2 Slide the pump assembly back into the reservoir being careful not to deform the reservoir o-ring. Align the reservoir with the six reservoir collar screws making sure the suction filter is facing the bottom of the reservoir. Install the six reservoir collar screws. Follow the procedures listed in the proceeding section (Hydraulic Reservoir Oil Level) when filling the reservoir with SAE-20 (ISO 46) oil thru the filler cap on the reservoir. Fill reservoir with oil to ½ inch on top of reservoir. Install the filler breather cap. Section H-10 JUNE/2013 ( )

11 Replacing the Hydraulic Pump Page 1 of 2 Follow the procedures established for your company s lock out/tag out procedures and lock out the 24 volt battery shut off switch in the OFF. Remove the filter / breather cap filter from the reservoir. Remove the drain plug at the bottom of the reservoir. Drain the oil from the hydraulic reservoir into a container for proper disposal. Do NOT reuse this hydraulic oil! Hydraulic Oil Return Suction Line Screen & Tube Remove the six reservoir collar screws and remove the reservoir and note the orientation of the pump suction line screen and tube and hydraulic oil return line. Remove the four pump screws and pull off the old pump. Remove the old pump shaft o-ring and wipe the pump base surface clean with a clean lint free cloth. Drive Shaft O- Drive Shaft Reservoir O-Ring Lightly coat the pump shaft o-ring supplied in the pump kit and install it into the pump base. Remove the old reservoir o-ring and wipe the pump base reservoir o-ring surface clean with a clean lint free cloth. Lightly coat the reservoir o-ring supplied in the pump kit and install it onto the pump base.. Coat the pump shaft with a small amount of grease so that the shaft will not damage the pump base shaft seal. Slowly slide the pump into place onto the pump base and align the 4 pump through holes with the 4 screw holes in the pump base. Install the 4 screws in the pump kit and tighten by hand, then torque to 130 inch pounds. Do NOT use air tools. Align Screw Holes Pump Screws Do not over tighten the four screws provided in the pump kit. Do NOT tighten any other screws in the pump assembly. Remove the pump suction line screen and tube from the old pump suction plate and install on the new pump suction plate with the same orientation. Suction filter inlet should be facing the bottom of the reservoir. JUNE/2013 ( ) H-11

12 Tow Behind Bulk Bin Replacing the Hydraulic Pump Page 2 of 2 Check that the hydraulic oil return line is pointing toward the side wall of the reservoir (oil should not return directly toward bottom of reservoir). Slide the pump assembly back into the reservoir being careful not to deform the reservoir o-ring. Align the reservoir with the six reservoir collar screws making sure the suction filter is facing the bottom of the reservoir. Install the six reservoir collar screws. Follow the procedures listed in the proceeding section (Hydraulic Reservoir Oil Level) when filling the reservoir with SAE-20 (ISO 46) oil thru the filler cap on the reservoir. Fill reservoir with oil to ½ inch on top of reservoir. Install the filler breather cap. Section H-12 JUNE/2013 ( )

13 24 Volt D C Hydraulic Power Unit Pressure Relief Valve Page 1 of 2 Wedge Retract Connection Tee in a hydraulic pressure gage in the wedge retract hose connection. Turn the battery disconnect switch to the ON Pull the hydraulic power pack switch to the ACTIVATE Turn the wedge directional control to the right (retract) position and read the maximum hydraulic pressure on the gauge. If the pump pressure is HIGHER than 2750 psi. Return the wedge directional control to the center (neutral) Push the hydraulic power pack switch to the CHARGE Battery Shut Off Switch Loosen the lock nut to the power unit pressure relief valve adjusting screw. Pull the hydraulic power pack switch to the ACTIVATE Turn the wedge directional control to the right (retract) position and turn the power unit pressure relief valve adjusting screw clockwise (CW) until pressure reads 2750 psi. Return the wedge directional control to the center (neutral) Push the hydraulic power pack switch to the CHARGE Turn the battery disconnect switch OFF. Tighten the hydraulic power unit pressure relief valve adjusting screw lock nut at new location. Remove the hydraulic pressure gage. Hydraulic Power Pack ON/OFF Switch If the pump differential pressure is LOWER than 2750 psi. Return the wedge directional control to the center (neutral) Push the hydraulic power pack switch to the CHARGE Loosen the lock nut to the power unit pressure relief valve adjusting screw. Pull the hydraulic power pack switch to the ACTIVATE JUNE/2013 ( ) H-13

14 Tow Behind Bulk Bin 24 Volt D C Hydraulic Power Unit Pressure Relief Valve Page 2 of 2 Turn the wedge directional control to the right (retract) position and turn the power unit pressure relief valve adjusting screw counterclockwise (CCW) until pressure reads 2750 psi. Wedge Cylinder Retract Control Return the wedge directional control to the center (neutral) Push the hydraulic power pack switch to the CHARGE Turn the battery disconnect switch OFF. Tighten the hydraulic power unit pressure relief valve adjusting screw lock nut at new location. Remove the hydraulic pressure gage. Power Unit Pressure Relief Valve Section H-14 JUNE/2013 ( )

15 Bulk Bin DOWN Flow Control Valve A pilot operated check valve allows free flow to the blind end of the cylinder (RAISE) when the bin tilt cylinder is extending. The flow back to tank from the rod end of the cylinder is checked. Bulk Bin DOWN Flow Control Valve As the bin tilt LOWER directional control valve is engage to the DOWN position, when sufficient hydraulic pressure in the pilot line is reached the check valve opens allowing flow back through the bin tilt directional control valve back to the reservoir. When the hydraulic pressure required to raise the bulk bin with heavy spike loads is near the amount of back pressure in the bulk bin down pilot line, the poppet will chatter on/off the check valve seat. The bulk bin flow control valve is installed to allow the operator to eliminate chattering. To reset to the factory setting: Loosen the Allen set screw on the bulk bin flow control knurled knob. Turn IN clockwise (CW) the bulk bin flow control knurled knob all the way (closed). Turn OUT counterclockwise (CCW).4 of a turn (From the closed position). Use the numbered scale on the flow control valve knurled knob (0 10). Tighten the Allen set screw on the bulk bin flow control knurled knob. JUNE/2013 ( ) H-15

16 Tow Behind Bulk Bin Bin Tilt Check Valve Pilot Operated Bin Tilt Check Valve The pilot-operated check valve assures that the bulk bin cylinder will stay where it stops in an extending position (unless the bin tilt cylinder piston seals leak). When the bin tilt cylinder is lowered, the hydraulic oil flows to the rod end of the cylinder. The flow of oil out of the blind end of the bin tilt cylinder is blocked by the bin tilt check valve until the pilot pressure is reached. If the bin tilt cylinder drifts down: Lower the bulk bin cylinder onto travel pads. Turn the battery disconnect switch to the OFF position and close, secure and lock out the battery box. Manually shift the bin tilt directional control valve in both directions to release hydraulic oil pressure! Bin Tilt Cylinder Bin Tilt Check Valve Use caution and crack both hose fittings (1/8 1/4) of a turn (CCW) at the bin tilt cylinder to allow any pressurized oil to bleed off slowly before removing a hose. Slowly remove the bin tilt check valve. Clean the pilot operated check by blowing compressed air through it. Replace the check valve if air does not dislodge the debris or if here is damage to the check valve seat. Lubricate the o-rings & back up washers with clean oil before installing the check valve back into the manifold. Section H-16 JUNE/2013 ( )

17 Wedge Check Valve Pilot Operated The pilot-operated check valve assures that the wedge cylinder will stay where it stops in an extending position (unless the bin tilt cylinder piston seals leak). When the wedge cylinder is retracted, the hydraulic oil flows to the rod end of the cylinder. The flow of oil out of the blind end of the wedge cylinder is blocked by the wedge check valve until the pilot pressure is reached. Wedge Check Valve Wedge Cylinder Wedge Check Valve If the wedge cylinder drifts down: Retract the bulk bin cylinder. Turn the battery disconnect switch to the OFF position and close, secure and lock out the battery box. Manually shift the bin tilt directional control valve in both directions to release hydraulic oil pressure! Use caution and crack both hose fittings (1/8 1/4) of a turn (CCW) at the wedge cylinder to allow any pressurized oil to bleed off slowly before removing a hose. Slowly remove the wedge cylinder check valve. Clean the pilot operated check by blowing compressed through it. Replace the check valves if air does not dislodge the debris or if here is damage to the check valve seat. Lubricate the o-rings & back up washers with clean oil before installing the check valve back into the manifold. JUNE/2013 ( ) H-17

18 Tow Behind Bulk Bin TROUBLESHOOTING - GENERAL Troubleshooting is a matter of quickly and logically isolating the cause of a problem and taking corrective action. Operating experience, a thorough understanding of the information in this manual, and accurate maintenance and operation records are the best troubleshooting tools an operator can have. The Tow Behind Bulk Bin is a group of rather simple systems. If you understand the basic workings of these systems individually and how they relate to each other, troubleshooting becomes a relatively simple task. This is intended to give you basic troubleshooting guidelines for the hydraulic systems on this machine. Local conditions and operating methods may result in problems, causes and remedies not covered in this guide. To use the guide most efficiently, locate a problem that matches the one being experience and, in a step-by-step method, check the causes listed until the correct remedy is found and the problem solved. Always turn off the battery disconnect switch on the Tow Behind Bulk Bin when performing maintenance, making adjustments, or whenever unintended movement of machine could occur; unless directed otherwise. Failure to comply could result in personal injury and/or damage to the machine. INSPECTION Inspect the hydraulic system for clues to the malfunction. Check to see if the unit can be operated without further damage. If not, shut down machine immediately. Always check these items before starting the machine: 1. Check hydraulic oil level. 2. Look for loose or disconnected hoses. An oil spot below the machine is a good indication of a loose hose or hydraulic component. 3. Inspect all vital hose connections, especially at the 24 volt dc hydraulic power unit. Loosen fittings only when system is not pressurized. High pressure leaks can cause personal injury. 5. Look for cover damage and/or indications of twisted, worn, crimped, brittle, cracked, or leaking hoses. Hoses with their outer cover worn through or otherwise damages should be considered unfit for further service. 6. While the tow behind bulk bin is running, and before going to work, inspect machine for leaks. Section H-18 JUNE/2013 ( )

19 FLUID CONTAMINATION The Tow Behind Bulk Bin utilizes high pressures up to 2750 psi; contamination is an extreme issue that must always be addressed. Contamination comes in many forms. It may be air, water and cutting oils, rust, chips and grit. It is usually easier to keep contaminants out of a system rather than remove them after they are in the system. Bulk handling and the re-use of oil containers almost guarantees you that "new" oil will be dirty. LOCATING LEAK SOURCES Petroleum oils are used in most hydraulic application to lubricate parts as well as transmit power. As oil temperature increases and as the hydraulic pressure rises, the lubricating film thins out. The result is rubbing parts supported by the oil film move closer together; friction and wear increase; seal materials age more quickly, become stiff and hard, and may readily permit leakage. The first step in locating leaks is to eliminate the possibility that an over-filled reservoir or spill created the "suspected" leak. The next step would be to clean the suspected area and watch. Leaks usually occur in fittings, hoses, O-rings, and other seals. Most leaks occur at fittings, but too often, finding the fitting that is leaking is difficult because the fluid runs along the hose and drips off at some other point. Leaks in high pressure lines sometimes are difficult to pin-point because the fluid comes out as a mist. Once you find the location of a leak, the specific cause has to be determined before it can be corrected. A scratch in a fitting seat or a cut in a seal lip that is big enough to leak excessively can still be too small to find with the naked eye. The use of a magnifying glass would assist you. HOSE LIFE Hose leakage or failure many times occurs where the end fitting grips the hose. Check the system for pressure spikes or surge. If bulges or bubbles occur on a flexible hose, a leak is taking place within the layers. The hose should be replaced. High oil temperatures (over 200 degrees Fahrenheit, 93 degrees Celsius) quickly harden or stiffen a rubber hose. When pressure pulses flex a hardened hose, it fails by cracking. Every increase of 25 F (14 C) cuts hose life in half. Use a replacement hose rated for actual fluid temperatures. Keep a log of hose use so replacement can be made before failure occurs. If a hose is installed with a twist in it, high operating pressures tend to force it straight. This can loosen the fitting or even burst the hose at the point of the strain. The number one cause of hose failure is abrasion due to lack of protection, and/or hoses not secured where possible. JUNE/2013 ( ) H-19

20 Tow Behind Bulk Bin SYSTEM TROUBLESHOOTING GUIDE PROBLEM POSSIBLE CAUSE SOLUTION Hydraulic power unit does not run 24 volt battery disconnect switch not turn to ON Hydraulic power pack button not pulled OUT. Problem with batteries 24 Volt electric motor windings burned out. Wiring problems Turn clockwise to ON Pull the hydraulic power pack button OUT to the Pull TO Activate Position. Check batteries for 24 volts at the electric motor connection Replace 24 volt electric motor Inspect all wiring connections & switches repair Hydraulic power unit pump runs but does move cylinders Low or no oil level in reservoir Suction strainer is clogged Filler/breather cap is dirty/clogged Hydraulic Pressure relief valve set too low or failing Hydraulic pump is worn out. Hydraulic pump to electric motor coupling disengaged. Check oil level, refill Clean suction strainer Clean the filler/breather cap Install a pressure gauge in one of the hydraulic circuits & check. Repair or replace pump. Inspect coupling for proper engagement. Hydraulic power unit pump is noisy Low oil level in reservoir Air in hydraulic circuit Suction strainer is clogged Check oil level, refill Bleed air out at cylinders (full stroke out) Clean suction strainer Hydraulic cylinders move slowly when hydraulic directional valves are fully engaged. Low oil level in reservoir Suction strainer is clogged Filler/breather cap is dirty/clogged Hydraulic Pressure relief valve set too low or failing Hydraulic pump is worn out. Check oil level, refill Clean suction strainer Clean the filler/breather cap Install a pressure gauge in one of the hydraulic circuits & check. Repair or replace pump. Hydraulic pump to electric motor coupling disengaged. Inspect coupling for proper engagement. Section H-20 JUNE/2013 ( )

21 PROBLEM POSSIBLE CAUSE SOLUTION A hydraulic cylinder drifts down Debris in pilot operated check valve Hydraulic cylinder piston seals leaking Clean out or replace pilot operated check valve Repair or replace cylinder Oil blowing out reservoir filler/breather cap Reservoir overfilled Reservoir filled with cylinder(s) rods extended Fill reservoir ½ below top of reservoir Cylinder rods must be fully retracted when checking or adding hydraulic oil to reservoir Hydraulic cylinder fails to fully extend. Hydraulic oil level is low Check hydraulic reservoir oil level with hydraulic cylinders retracted Foamy oil flowing out of reservoir filler/breather cap Air is present in the hydraulic circuit The hydraulic oil return line (tube) in reservoir malfunction Suction tube is loose Bleed the air out of the cylinder Position return line so oil is not returning to the bottom of reservoir Repair Post-Troubleshooting After troubleshooting and eliminating the problems, be sure to follow correct procedures in restarting the machine. The items to be checked include the following: check to ensure replaced components are the correct units, ensure hydraulic connections are correct and tightened, ensure electrical connections are correct and tight, be sure pump and hydraulic motor housing cases are filled with clean oil (if required), properly set adjustable components, remove electrical interlocks, alert personnel to stand clear before starting the machine, and after the system is running, bleed the air and set the pressures to the proper settings. Effective hydraulic system maintenance and troubleshooting is critical to reducing your hydraulic system downtime. While these guidelines do not address every possible problem, they offer a basic day-to-day approach to troubleshooting your hydraulic system. JUNE/2013 ( ) H-21