User Manual

SECTION 3 - TROUBLESHOOTING
3-6 – JLG Lift – 3120884
Function Speed and Drive Speed does not operate below horizontal.
Damaged wiring on level limit switch. Repair or replace wiring/Run System T est
Creep Switch Open. Replace switch/Run System T est
Machine Tilted Level machine.
Speed Sensor Failure. Replace Sensor.
LOWER LIFT FUNCTION.
If the boom assembly does not fully lower.
The Mid and Lower Booms are out of synchroni-
zation.
Refer to synchronize procedure.
MAIN TELESCOPE SYSTEM.
No response to telescope control.
T elescope function not activated within 7 sec-
onds after footswitch was depressed.
Recycle footswitch.
T elescope control switch inoperative. Repair or replace control switch/Run System
Test
Hydraulic system oil low. Replenish oil as necessary.
Damaged wiring on control switch or solenoid
valve.
Repair or replace wiring/Run System T est
Directional valve not functioning properly . Repair or replace valve.
Restricted or broken supply line on valve bank or
hydraulic pump.
Clean or replace line.
Proportional Flow Regulator Not Powered. Check wiring/Run System T est.
T elescope cylinder not functioning properly . Repair or replace cylinder.
Hydraulic pump not functioning properly. Repair or replace pump/Run System T est.
Boom will not extend.
T elescope function not activated within 7 sec-
onds after footswitch was depressed.
Recycle footswitch.
Directional 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 .
T elescope cylinder not functioning properly . Repair or replace cylinder.
Personality Setting incorrect. Set to Factory Default.
Table 3-2.Boom Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY