
918496/GP0313 159
Lift arm does not maintain
raised position with multi-
purpose joystick centered
(neutral)
Oil leaking past lift cylinder
seals (internal or external)
Contact dealer
Oil leaking past lift spool in
control valve
Contact dealer
Leaking hydraulic hoses,
tubes or fittings between
control valve and cylinders
Contact dealer
Auxiliary hydraulics do not
function
Spool in control valve not
actuated or leaking
Contact dealer
Hydraulic oil leaking past
seals
Contact dealer
Auxiliary hydraulic
connections improperly
connected
Correct hydraulic
connections
Auxiliary hydraulics
connections difficult to
connect/disconnect
Auxiliary hydraulics circuit
under pressure
Relieve auxiliary
hydraulics circuit
pressure—see “Auxiliary
Circuit Pressure Relief”
on page 86
Hydrostatic Drive System Troubleshooting
Problem Possible Cause Corrective Action
No response from either
hydrostatic drive or the
lift/tilt systems
Hydraulic oil viscosity too
heavy
Allow longer warm-up
Replace with proper
grade hydraulic oil—see
“Fluid
Capacities/Lubricants”
on page 31 for proper oil
grade
Dynamic braking not
effective when drive pedal
in neutral
Sticking flushing valve
(AL100/200/300 series)
Repair/replace flushing
valve
Hydraulic System Troubleshooting
Problem Possible Cause Corrective Action
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