Gehl SL4635 - Hydraulic System Malfunctions

PRINTED IN USA 59 907808/CP0300
Hydraulic System
Problem Possible Cause Remedy
Lift/Tilt controls
fail to respond.
Hydraulic oil viscosity is too heavy.
Hydraulic oil level is low.
Solenoid valve(s) malfunctioning.
Restraint bar or seat switch malfunction.
Allow longer warm-up or replace with
proper viscosity oil.
Check oil level in reservoir. If oil is low,
check for an external leak. Repair and add
oil.
Check electrical connections to lift solenoid
and repair.
Check switches.
Hydraulic cylinder
action is slow for lift
and/or tilt functions.
Low engine speed.
Hydraulic oil viscosity is too heavy.
Control linkage is restricted.
Hydraulic oil leaking past cylinder
piston seals.
Worn gear pump.
Solenoid valve(s) could be malfunctioning.
Relief valve in control valve not functioning
correctly. Squealing noise should be
evident while operating.
Operate engine at higher speed.
Allow longer warm-up or replace existing
oil with proper viscosity oil.
Check for control linkage restriction and
adjust.
Contact your Gehl dealer for assistance.
Contact your Gehl dealer for assistance.
Check electrical connections to lift solenoid
and repair connections as needed. If lift
solenoid valve is still not functioning
properly, contact your Gehl dealer for
assistance.
Contact your Gehl dealer for assistance.
Jerky lift arm and
bucket action.
Seat or restraint bar switch malfunction.
Air in the hydraulic system.
Oil in hydraulic reservoir is low.
Check electrical connections to the
switches. Replace as needed.
Cycle lift and tilt cylinders to maximum
stroke and maintain pressure for short time
to clear air from system.
Check and add oil to reservoir as needed.
Bucket does not
level on the lift
cycle.
Self-leveling valve misadjusted or
malfunctioning.
Contact your Gehl dealer for assistance.
Bucket drifts
downward with tilt
control in neutral.
Oil leaking past tilt cylinder seals
(internal or external).
Self-leveling valve is malfunctioning.
Leaking hydraulic hoses, tubes, or fittings
between control valve and cylinders.
Contact your Gehl dealer for assistance.
Contact your Gehl dealer for assistance.
Inspect hoses and tubes, tighten fittings.
Replace hoses or tubes as needed.
No down pressure
on the bucket.
Control valve in “Float” position.
Tilt cylinders are malfunctioning.
Relief valve in control valve not functioning
properly. Squealing noise should be
evident while operating.
Take control out of “Float” position.
Contact your Gehl dealer for assistance.
Contact your Gehl dealer for assistance.