JLG 25RTS Service & Maintenance page 67

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