JLG 45e Service Manual - Manual (Page 81)

SECTION 3 - TROUBLESHOOTING
3120861 – JLG Lift – 3-7
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.