50950106/AP0313 99
Hydraulic System
Problem Possible Cause Remedy
Hydrostatic (drive)
system is noisy.
Hydraulic oil viscosity too
heavy.
Allow longer warm-up or
replace oil with proper
viscosity oil.
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, fill as needed.
Drive motor(s) or hydrostatic
pump(s) have internal
damage or leakage.
Contact your dealer.
Right side doesn’t
drive in either
direction. Left side
operates normally.
Relief valves on rear
hydrostatic pump
malfunctioning.
Rear hydrostatic pump arm
control lever loose.
Control rod linkage to rear
hydrostatic pump
disconnected.
Contact your dealer.
Tighten control lever.
Attach control rod linkage.
Right side doesn’t
drive in one
direction.
Relief valve on rear
hydrostatic pump
malfunctioning.
Contact your dealer.
Rear hydrostatic pump
malfunctioning.
Contact your dealer.
Left side doesn’t
drive in either
direction. Right side
operates normally.
Relief valves on front
hydrostatic pump
malfunctioning.
Front hydrostatic pump arm
control lever loose.
Control rod linkage to front
hydrostatic pump
disconnected.
Contact your dealer.
Tighten control lever.
Attach control rod linkage.
Left side doesn’t
drive in one
direction.
Relief valve on front
hydrostatic pump
malfunctioning.
Contact your dealer.
Front hydrostatic pump
malfunctioning.
Contact your dealer.
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