JLG 80HX, Service Maintenance Manual

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SECTION 3 - TROUBLESHOOTING
3120863 – JLG Lift – 3-5
Pump Volume, Wheel Motor Speed and High Engine does not operate below horizontal.
Damaged wiring on level limit switch. Repair or replace wiring.
Solenoid failure. Replace solenoid.
Tripped circuit breaker. Reset circuit breaker.
Damaged level limit switch. Replace switch, repair or replace holder.
Defective relay, main terminal box. Replace relay.
Defective platform switch. Replace switch.
TELESCOPE SYSTEM.
No response to telescope control.
Telescope function not activated within 7 sec-
onds after footswitch was depressed. Recycle footswitch.
Telescope control switch inoperative. Repair or replace control switch.
Hydraulic system oil low. Replenish oil as necessary.
Damaged wiring on control switch or solenoid
valve. Repair or replace wiring.
Control valve not functioning properly. Repair or replace valve.
Restricted or broken supply line on valve bank or
hydraulic pump. Clean or replace line.
Telescope cylinder not functioning properly. Repair or replace cylinder.
Hydraulic pump not functioning properly. Repair or replace pump.
Boom will not extend.
Telescope function not activated within 7 sec-
onds after footswitch was depressed. Recycle footswitch.
Control valve not functioning properly. Repair or replace control valve.
Restricted or broken hydraulic line or fitting. Clean, repair, or replace line or fitting.
Pressure setting incorrect. Check pressure/re-adjust as necessary.
Telescope cylinder not functioning properly. Repair or replace cylinder.
Table 3-2.Boom Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY