SECTION 3 - TROUBLESHOOTING
3-6
31215808
Table 3-1. AC Unit - Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
Outrigger LED light does not turn on.
Outriggers are not properly inserted in outrigger sock-
ets.
Check all outriggers for proper installation 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 out-
rigger sockets (causing an open circuit).
Properly reinstall wire to contactor screw per Figure 3-5.
and instructions in Section 3.6, Outrigger Interlock Con-
tacts.
Contactor damaged.
Replace contactor.
LED burnt out.
Replace LED.
Pull pin on outrigger socket is damaged.
Replace pull pin.
Platform does not rise when the four LED’s are ON and motor does not start
.
Red emergency stop 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 functioning.
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.
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