Jlg 40H Service Manual User Manual Page 115

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SECTION 3 - TROUBLESHOOTING
3120240 – JLG Lift – 3-3
Table 3-2. Boom Assembly Troubleshooting.
TROUBLE PROBABLE CAUSE REMEDY
BOOM ELEVATION SYSTEM.
No response to control. Lift control inoperative.
Lift cylinder holding valve inoperative.
Dump valve (bypass) not operating.
Electrical malfunction.
Hydraulic system oil low.
Restricted or broken supply line on valve bank or
hydraulic pump.
Control valve not functioning properly.
Lift cylinder not functioning properly.
Hydraulic pump not functioning properly.
Repair or replace control lever.
Repair or replace holding valve.
Determine cause and repair or replace valve.
See wiring diagram.
Replenish oil as necessary.
Clean or replace line.
Repair or replace valve.
Repair or replace cylinder.
Repair or replace pump.
Boom will not raise. Load capacity exceeded (personnel or equipment
on platform).
Hydraulic system oil low.
Electrical failure to valves.
Restricted or broken supply line on fitting.
Control valve not functioning properly.
Pressure relief valve not functioning properly.
Bypass valve (dump) not functioning.
Lift cylinder not functioning properly.
Binding lift cylinder or boom pivot pin.
Reduce load. (Refer to capacity placard.)
Replenish oil as necessary.
See wiring diagram.
Clean, repair, or replace line or fitting.
Repair or replace valve.
Re-adjust or replace valve.
Repair or replace valve.
Repair or replace cylinder.
Repair or replace cylinder or pin.
Boom will not lower. See: Boom will not raise.
Pressure relief valve not functioning properly.
Holding valve not functioning properly.
Re-adjust or replace valve.
Re-adjust or replace valve.
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