JLG 45e ANSI Service Manual - Manual (Page 85)

SECTION 3 - TROUBLESHOOTING
3120743 – JLG Lift – 3-9
Table 3-3.Turntable Assembly - Troubleshooting
TROUBLESHOOTING CHART
TROUBLE PROBABLE CAUSE REMEDY
CONTROL VALVE.
Valve spool sticking.
Dirt in oil causing excessive temperature built-up. Change oil using recommended viscosity and flush
system.
Incorrect valve mounting causing warping of the
unit. Loosen valve and check mounting
Repair as necessary.
Valve spool scored. Remove valve and repair or replace as necessary.
Return spring weak or broken. Remove valve and repair or replace as necessary.
Relief valve malfunctioning causing excessive
pressure within valve. Check pressure delivery to and from valve and
repair or replace as necessary.
Valve leaking.
Dirt or other foreign material under seal. Remove and replace valve as necessary.
Valve spool scored. Repair or replace valve.
Excessive back pressure caused by restricted
return line to reservoir. Remove line and clear obstruction or replace line as
necessary.
Damaged valve seals. Repair or replace valve as necessary.
Is the main relief valve, of the brake / steer valve set
too low? Check settings.
Is the pressure filter, of the brake / steer valve
clogged? Check filter.