167
50940193/DP0415
Hydrostatic Drive System Troubleshooting
Table 27: Hydrostatic Drive System Troubleshooting
Problem
Possible Cause
Corrective Action
Travel drive does
not operate in either
direction
Parking brake is applied.
Release parking brake.
Low hydraulic oil level.
Top off hydraulic oil. See “Checking Hydraulic
Oil Level” on page 143. See “Fluid Capacities/
Lubricants” on page 183 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.
Right side drive
doesn’t operate in
either direction; left
side operates
normally
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.
Right side drive
doesn’t operate in
one direction
Rear hydrostatic pump relief
valve malfunction.
Contact dealer.
Rear hydrostatic pump
malfunction.
Left side drive
doesn’t operate in
either direction; right
side operates
normally
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.
Left side drive
doesn’t operate in
one direction
Front hydrostatic pump relief
valve malfunction.
Contact dealer.
Front hydrostatic pump
malfunction.
Travel drive system
noisy
Hydraulic oil viscosity too
heavy.
Replace existing oil with proper viscosity oil.
See “Fluid Capacities/Lubricants” on page 183.
Allow longer warm-up.
Low hydraulic oil level.
Top off hydraulic oil. See “Checking Hydraulic
Oil Level” on page 143. See “Fluid Capacities/
Lubricants” on page 183 for proper oil grade.
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 motor(s) or hydrostatic
pump(s) internal damage/
leakage.
Contact dealer.
Summary of Contents for R135
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