Hydrostatic Drive System Troubleshooting Table 27: Hydrostatic Drive System Troubleshooting Problem
Possible Cause Parking brake is applied. 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.
106
Corrective Action Release parking brake. Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page 92. See “Fluid Capacities/Lubricants” on page 115 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 Check linkage connection at control levers and neutral centering malfunction. 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 Check linkage connection at control levers and neutral centering linkage malfunction. mechanisms. Adjust/repair as necessary. Contact dealer. Front hydrostatic pump relief valve malfunction. Contact dealer. Front hydrostatic pump malfunction. Replace existing oil with proper viscosity oil. See “Fluid Capacities/ Lubricants” on page 115. Hydraulic oil viscosity too heavy. Allow longer warm-up. Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page 92. Low hydraulic oil level. See “Fluid Capacities/Lubricants” on page 115 for proper oil grade. Cycle lift and tilt cylinders to maximum stroke and maintain pressure Air in hydraulic system. 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 Contact dealer. damage/ leakage. Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page 92. Low hydraulic oil level. See “Fluid Capacities/Lubricants” on page 115 for proper oil grade. Low hydrostatic system charge pressure. Contact dealer. Drive motor or hydrostatic pump internal damage/ leakage. Cycle lift and tilt cylinders to maximum stroke and maintain pressure Air in hydraulic system. 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 Contact dealer. damage/ leakage. Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page 92. Low hydraulic oil level. See “Fluid Capacities/Lubricants” on page 115 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 page 91. 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.
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