JLG 260MRT - Elevation System Troubleshooting

SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3-14 3121801
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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 seconds after lift switch is
activated.
Activate lift switch, then activate joystick within three sec-
onds.
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 fitting. 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.
E ng i ne do e s n ot re s po nd w he n li f t c on tr ol s wi tc h i s mo ve d t o
up position.
Refer to Electrical System Troubleshooting - No response to
control switch.
No el ec tr ica l s ign al be ing se nt t o li ft up c on trol val ve c ar -
tridge.
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 controller within three sec-
onds.
Enable circuit not functioning properly. Replace enable circuit card.
No el ec tr ica l s ign al se nt t o li ft dow n c ont ro l v alv e ca r tr idg e. 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.
En gi ne d oe s no t re sp on d wh en lif t s wit ch is m ove d to dow n
position.
Refer to Electrical System Troubleshoot ing - No response to
control switch.
No el ec tr ica l s ign al bei ng sen t to li ft d ow n co ntro l va lve . R efe r to Ele c tri ca l Sy ste m Tro ubl es ho ot i ng - No res pon se to
control switch.