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SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3-14
– JLG Lift –
3121801
.
Table 3-1. Elevation System Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
Platform Elevation System
No Response to LIft Control
Lift not performed within three seconds after lift
function switch is selected.
Reselect lift function switch, then activate joystick
within three seconds.
Enable circuit not functioning properly.
Replace enable circuit card.
Lift control switch inoperative.
Repair or replace control switch.
Hydraulic system oil low.
Replenish oil as necessary.
Restricted or broken supply line on valve
bank or pump.
Clean, repair or replace line.
Control valve not functioning properly.
Repair or replace valve.
Lift cylinder not functioning properly.
Repair or replace cylinder.
Hydraulic pump not functioning properly. Repair or replace pump.
Platform will not raise.
Joystick not activated within three sec-
onds after lift switch is activated.
Activate lift switch, then activate joystick
within three seconds.
Enable circuit not functioning properly.
Replace enable circuit card.
Load capacity exceeded. (Personnel
and/or equipment on platform).
Reduce load. (Refer to capacity placard).
Hydraulic system oil low.
Replenish oil as necessary.
Restricted or broken hydraulic line or fit-
ting.
Clean, repair, or replace line or fitting.
Control valve not functioning properly.
Repair or replace valve.
Lift cylinder not functioning properly.
Repair or replace lift cylinder.
Engine does not respond when lift control
switch is moved to up position.
Refer to Electrical System Troubleshoot-
ing - No response to control switch.
No electrical signal being sent to lift up control valve
cartridge.
Refer to Electrical System Troubleshooting - No
response to control switch.
Platform will not lower
Joystick not activated within three sec.
after lift switch is activated.
Depress lift switch, then activate control-
ler within three seconds.
Enable circuit not functioning properly.
Replace enable circuit card.
No electrical signal sent to lift down con-
trol valve cartridge.
Refer to Electrical System Troubleshoot-
ing - No response to control switch.
Lift down control valve cartridge not functioning
properly.
Repair or replace lift down control valve
cartridge.
Lift cylinder not functioning properly.
Repair or replace lift cylinder.
Engine does not respond when lift switch
is moved to down position.
Refer to Electrical System Troubleshoot
ing - No response to control switch.
No electrical signal being sent to lift down
control valve.
Refer to Electrical System Troubleshoot
ing - No response to control switch.
Summary of Contents for JLG 260MRT
Page 1: ...Service Maintenance Manual Model 260MRT 3121801 April 19 2013...
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Page 22: ...SECTION 1 SPECIFICATIONS 1 14 JLG Lift 3121801 NOTES...
Page 66: ...SECTION 2 PROCEDURES 2 44 JLG Lift 3121801 NOTES...
Page 91: ...SECTION 3 GENERAL ELECTRICAL INFORMATION SCHEMATICS 3121801 JLG Lift 3 25 NOTES...
Page 95: ...SECTION 3 GENERAL ELECTRICAL INFORMATION SCHEMATICS 3121801 JLG Lift 3 29 NOTES...
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