JLG E45A_AJ ANSI Service Manual - Manual (Page 102)

SECTION 3 - TROUBLESHOOTING
3-6 – JLG Lift – 3120765
Function Speed and Drive Speed does not operate below horizontal.
Damaged wiring on level limit switch. Repair or replace wiring/Run System Test
Creep Switch Open. Replace switch/Run System Test
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.
Telescope function not activated within 7 sec-
onds after footswitch was depressed. Recycle footswitch.
Telescope 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 Test
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 Test.
Telescope cylinder not functioning properly. Repair or replace cylinder.
Hydraulic pump not functioning properly. Repair or replace pump/Run System Test.
Boom will not extend.
Telescope 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.
Telescope 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