
918496/GP0313 161
Travel drive system noisy Hydraulic oil viscosity too
heavy
Allow longer warm-up
See “Fluid
Capacities/Lubricants”
on page 31 for proper oil
grade
Low hydraulic oil level Add oil
AL 100 Series hydraulic
tanks not evenly filled
See “Checking Hydraulic
Oil Level” on page 122
Air in hydraulic system Cycle lift and tilt
cylinders to maximum
stroke and maintain
pressure for short time to
clear from system
Drive motor(s) or hydrostatic
pump(s) internal damage/
leakage
Contact dealer
Sluggish travel drive
acceleration
Low hydraulic oil level Add oil
Low hydrostatic system
charge pressure
Contact dealer
Drive motor or hydrostatic
pump internal damage/
leakage
Contact dealer
Brake/inch or throttle pedal
applied, stuck or
malfunctioning
Release/repair the
brake/inch pedal
(AL 400/500 Series only)
Force pedal calibration,
if necessary
Engine running rough Poor fuel quality or
incorrect grade—See
“Fluid
Capacities/Lubricants”
on page 31 for proper
fuel grade
Sticking flushing valve
(AL100/200/300 series)
Repair/replace flushing
valve
AL 100 Series hydraulic
tanks not evenly filled
See “Checking Hydraulic
Oil Level” on page 122
Hydrostatic Drive System Troubleshooting
Problem Possible Cause Corrective Action
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