JLG 40RTS ANSI Service Manual - Manual (Page 67)

SECTION 3 - TROUBLESHOOTING
3120691 – JLG Sizzor –
3-3
Platform raises and lowers erratically
Hydraulic system low Replenish hydraulic oil as required
Restricted or broken hydraulic line or fitting Clean, repair or replace line or fitting
Lack of lubricant on lift cylinder attach pins Lubricate as required (Refer to lubrication chart)
Counterbalance valve on lift cylinder improperly
adjusted or not functioning properly Replace valve
Control valve not functioning properly Repair or replace valve
Sizzor arm pins not properly lubricated Lubricate as necessary
Worn seals in lift cylinder Replace seals
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 functioning prop-
erly Repair or replace holding valve
High drive does not operate below set height
Damaged wiring on limit switch Repair or replace wiring
Damage limit switch Replace limit switch
Flow control valve not functioning properly Repair or replace flow control valve
Flow control valve not properly set Reset flow control valve
Table 3-1. Platform Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY