SECTION 4 - 830P - TROUBLESHOOTING AND SCHEMATICS
4-6 – JLG Lift – 3121741
Table 4-1. 830P - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Platform does not rise.
Red emergency stop button is engaged (PUSHED
IN) on control station.
Disengage (TURN CLOCKWISE) red emergency
button until it pops out.
Enable button on platform control not pressed in.
Press and hold Enable button while operating
platform up or down buttons.
Control relay not functioning. Replace control relay.
Motor start relay not functioning. Replace motor start relay.
Unit wiring not properly grounded. Check all ground connections 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 functioni ng. Re pl ace L if t D OWN s ol enoid v al ve .
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 lo wers ve ry slow ly.
Lift DOWN solenoid valve not functioning. Rep la ce Lift DO WN sole no id va lve.
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