Hydrostatic Drive System Troubleshooting

Table 27: Hydrostatic Drive System Troubleshooting

Problem Possible Cause

Parking brake is applied. Release parking brake.

Low hydraulic oil level.

Travel drive does not operate in either direction

Right side drive doesn’t operate in either direction; left side operates normally

Right side drive doesn’t operate in one direction

Left side drive doesn’t operate in either direction; right side operates normally

Left side drive doesn’t operate in one direction

Travel drive system noisy

Sluggish travel drive acceleration

Travel drive overheating

Right side drive doesn’t operate in either direction. Left side operates normally.

Right side drive doesn’t operate in one direction.

Left side drive doesn’t operate in either direction. Right side operates normally.

Corrective Action

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page92. See “Fluid Capacities/Lubricants” on page115 for proper oil grade.

Low or no charge pressure. Contact dealer.

Hydrostatic pump(s) relief valve malfunction.

Restraint bar not lowered. Lower restraint bar.

Seat or restraint bar switch malfunction.Check switch electrical connections; repair as necessary.

Rear hydrostatic pump relief valve malfunction.Contact dealer.

Rear hydrostatic pump control rod linkage malfunction. Check linkage connection at control levers and neutral centering mechanisms. Adjust/repair as necessary. Contact dealer.

Rear hydrostatic pump relief valve malfunction. Contact dealer.

Rear hydrostatic pump malfunction.

Front hydrostatic pump relief valve malfunction.Contact dealer.

Linkage front hydrostatic pump control rod linkage malfunction. Check linkage connection at control levers and neutral centering mechanisms. Adjust/repair as necessary. Contact dealer.

Front hydrostatic pump relief valve malfunction. Contact dealer.

Front hydrostatic pump malfunction.

Hydraulic oil viscosity too heavy.

Low hydraulic oil level.

Air in hydraulic system.

Replace existing oil with proper viscosity oil. See “Fluid Capacities/ Lubricants” on page115. Allow longer warm-up.

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page92. See “Fluid Capacities/Lubricants” on page115 for proper oil grade.

Cycle lift and tilt cylinders to maximum stroke and maintain pressure for short time to clear air from system. Also check for low oil level in reservoir; top off as necessary.

Drive motor(s) or hydrostatic pump(s) internal damage/ leakage. Contact dealer.

Low hydraulic oil level.

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page92. See “Fluid Capacities/Lubricants” on page115 for proper oil grade.

Low hydrostatic system charge pressure. Contact dealer.

Drive motor or hydrostatic pump internal damage/ leakage.

Air in hydraulic system.

Cycle lift and tilt cylinders to maximum stroke and maintain pressure for short time to clear air from system. Also check for low oil level in reservoir; top off as necessary.

Drive system continuously overloaded. Improve operation procedure. Lift/tilt or auxiliary system continuously overloaded.

Drive motor(s) or hydrostatic pump(s) internal damage/ leakage. Contact dealer.

Low hydraulic oil level.

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page92. See “Fluid Capacities/Lubricants” on page115 for proper oil grade. Oil cooler fins restricted. Clean oil cooler fins.

Hydraulic oil filter restricted. Clean hydraulic oil cooler. See “Cleaning Radiator Fins” on page91.

Rear hydrostatic pump relief valve malfunction. Contact dealer.

Rear hydrostatic pump control rod linkage malfunction.

Rear hydrostatic pump relief valve malfunction. Contact dealer.

Rear hydrostatic pump malfunction.

Front hydrostatic pump relief valve malfunction. Contact dealer. Linkage front hydrostatic pump control rod linkage malfunction.

Problem Possible Cause

Left side drive doesn’t operate in one direction.

Front hydrostatic pump relief valve malfunction. Contact dealer. Front hydrostatic pump malfunction.

Electrical Troubleshooting

Table 28: Electrical Troubleshooting

Problem Possible Cause

Electrical system does not function

Control pad and information center display do not activate with ignition keyswitch in the ON/RUN position

Starter does not engage when ignition keyswitch turned to the START position

Fuel gauge inoperative

Corrective Action

Coolant temperature gauge inoperative

Hour meter inoperative

Work/road lights inoperative

Corrective Action

Battery disconnect switch is in OFF position. Turn battery disconnect switch to the ON position. See “Battery Disconnect Switch” on page52.

Battery terminals or cables loose or corroded.Clean battery terminals and cables and retighten.

Battery malfunction. Test battery. Recharge/ replace as necessary.

Blown main fuse. Correct over-current problem and replace main fuse. See “Fuses, Relays and Diodes” on page97.

Main wiring harness connectors at rear of ROPS/FOPS not properly plugged in. Check main harness connectors. Reconnect/repair as needed.

Blown fuse. Check circuit and replace fuse. See “Fuses, Relays and Diodes” on page97.

Battery terminals/cables loose/corroded.Clean battery terminals and cables and tighten.

Main wiring harness connectors at rear of ROPS/FOPS not properly plugged in. Check main harness connectors. Reconnect/repair as needed.

Poor electrical connections in start circuit.Check connections repair as necessary.

Battery terminals/cables loose/corroded.Clean battery terminals and cables and tighten.

Starter relay malfunction. Test relay; replace if necessary. Contact dealer.

Battery discharged/malfunctioning. Test battery. Recharge/ replace if necessary.

Starter solenoid malfunction. Contact dealer.

Starter or pinion malfunctioning. Repair/replace as needed.

Ignition wiring, seat switch, restraint bar switch, etc. loose or disconnected.

Check wiring for poor connections, broken leads; repair wiring or connection.

Restraint bar raised. Lower restraint bar. Engine fault code(s). Contact dealer.

Fuel level sender malfunction. Replace fuel level sender. Loose wiring/terminal connections. Check wiring connections.

Blown fuse. Check circuit and replace fuse. See “Fuses, Relays and Diodes” on page97.

Fuel gage malfunction. Replace gauge.

Temperature sender malfunction. Replace temperature sender. Loose wiring/terminal connections. Check wiring connections.

Blown fuse. Check circuit and replace fuse. See “Fuses, Relays and Diodes” on page97.

Coolant temperature gage malfunction.Replace gauge.

Loose wiring/terminal connections. Check wiring/connections. Alternator malfunction. Repair/replace alternator. Hour meter malfunction. Replace information center electronic display.

Single light not working— light bulb burned out, faulty wiring. Check and replace light bulb as needed, check wiring connections. No lights—blown fuse. Check circuit and replace fuse. See “Fuses, Relays and Diodes” on page97.

Light switch malfunction, poor ground or other wiring connection. Check ground/wire connections, replace light switch.

Table 28: Electrical Troubleshooting Problem

Solenoid wiring disconnected or faulty.Check circuit; repair as necessary.

Lift/tilt and/or drive lock solenoid malfunction

Error Codes

Seat or restraint bar switch malfunction. Contact dealer.

Solenoid valve coil malfunction.

Instrument panel hydraulic solenoid relay malfunction.

The tables in this section describe error codes which may be reported on the information center electronic display screen. More than one error can be reported at one time and may be display on more than one screen. See page38.

Engine Diagnostic Trouble Codes (DTC)

failure (foot pedal in open position)

1P1125Acceleration Sensor 3 Sensor failure (foot pedal in closed position)

2P0224Acceleration Sensor 3 Intermittent fault

3P0223Acceleration Sensor 2 Acceleration sensor 2 fault (high voltage)

4P0222Acceleration Sensor 2 Acceleration sensor 2 fault (low voltage)

0P1226Accelerator Pedal Position Sensor "B"Above normal operation range

1P1225Accelerator Pedal Position Sensor "B"Below normal operation range

P0228Acceleration Sensor 3 sensor 3 fault (high voltage) sensor 3 fault (high voltage)