JLG 260MRT Service Manual - Manual (Page 81)

SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3121801 – JLG Lift – 3-15
Platform raises and lowers erratically
Hydraulic system oil low. Replenish oil as necessary.
Restricted or broken hydraulic line or fit-
ting. Clean, repair or replace line.
Counterbalance valve on lift cyl. improp-
rely adjusted or not functioning properly. Replace valve.
Control valve not functioning properly. Repair or replace valve.
Worn seals in lift cylinder. Replace seals.
Lift cylinder not functioning properly. Repair or replace lift cylinder.
Platform drifts down
Manual lowering valve not functioning
properly. Repair or replace valve.
Worn seals in lift cylinder. Replace seals.
Holding valve on lift cylinder not function-
ing properly. Repair or replace valve.
High Drive does not operate below horizontal
Damaged wiring on limit switch. Repair or replace wiring.
Damaged limit switch. Replace limit switch
Table 3-1. Elevation System Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY