50950260/AP1216 93
Hydrostatic System
Problem Possible Cause Remedy
Hydrostatic (drive)
system is noisy.
Hydraulic oil viscosity is too
heavy.
Allow longer warm-up or
replace existing oil with the
proper viscosity oil.
Air in hydraulic system. Cycle lift and tilt cylinders to
maximum stroke and
maintain pressure for a 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.
Rear hydrostatic pump arm
control shaft key missing.
Contact your dealer.
Relief valves on rear
hydrostatic pump
malfunctioning.
Contact your dealer.
Control rod linkage to rear
hydrostatic pump
disconnected.
Attach control rod linkage.
Right side doesn’t
drive in forward
direction.
Relief valve on rear
hydrostatic pump is
malfunctioning.
Contact your dealer.
Rear hydrostatic pump
malfunctioning.
Contact your dealer.
Left side doesn’t
drive in either
direction. Right side
operates normally.
Key missing on front
hydrostatic pump arm control
shaft.
Contact your dealer.
Relief valves on front
hydrostatic pump
malfunctioning.
Contact your dealer.
Control rod linkage to front
hydrostatic pump
disconnected.
Attach control rod linkage.
Left side doesn’t
drive in one
direction.
Relief valve on front
hydrostatic pump is
malfunctioning.
Contact your dealer.
Front hydrostatic pump
malfunctioning.
Contact your dealer.
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