JLG 41EL Service Manual - Manual (Page 53)

SECTION 3 - TROUBLESHOOTING
3120782 – JLG Lift – 3-3
Table 3-2. DC Unit - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Outrigger LED light does not turn on.
Outriggers are not properly inserted in
outrigger sockets. Check all outriggers for proper instal-
lation in outrigger sockets
Power source is OFF. Check power source.
Fuse(s) blown. Check all insulating grommets on
inter-lock contactors in base frame
outrigger sockets and contactor
plates on outrigger beams. Replace
damaged grommet(s) and replace
blown fuse.
Check for loose wire(s) on contactor
screws under outrigger sockets (caus-
ing an open circuit). Properly reinstall wire to contactor
screw per Figure 3-1. and instructions
in Section 3.4, Outrigger Interlock
Contacts."
Contactor damaged. Replace contactor.
LED burnt out. Replace LED.
Pull pin on outrigger socket is dam-
aged. Replace pull pin.
Platform does not rise when the four LED’s are ON and motor does not start.
Red emergency button is engaged
(PUSHED IN) on either ground control
station or on platform. Disengage (TURN CLOCKWISE) red
emergency button until it pops out.
Control relay not functioning. Replace control relay.
Motor start relay not functioning. Replace motor start relay.
Unit wiring not properly grounded. Check all grounds in the wiring.
Unit lowers by itself.
Manual descent valve open. Close manual descent valve.
Hydraulic hose and/or fittings loose
causing a hydraulic pressure leak. Tighten hydraulic hose and/or fittings.
Lift DOWN solenoid valve not function-
ing. Replace Lift DOWN solenoid valve.
Unit leaking hydraulic oil.
Hydraulic hose and/or fittings loose. Tighten hydraulic hose and/or fittings.
Valve and/or plug loose. Tighten valve and/or plug.
Breather cap on tank is saturated or
clogged with oil. Replace breather cap on tank.
Hydraulic oil tank over-filled. Lower oil level to full mark on dipstick.
Unit lowers very slowly.
Flow control valve not functioning. Replace flow control valve.