SECTION 3 – TROUBLESHOOTING
3-6 USTC January 15, 2001
Outrigger cylinder retracts during
crane operation.
TROUBLE PROBABLE CAUSE REMEDY
Table 3-4. Hydraulic Components (continued)
Add oil.
Remove line and clear
obstruction or replace line.
Repair or replace pump.
Check pressure delivery from
control valve and repair or
replace valve.
Add oil.
Remove line and clear
obstruction or replace line.
Repair or replace pump.
Repair or replace control cable.
Check pressure delivery from
control valve and repair or
replace valve.
Repair or replace sticking valve.
Repair or replace hoist motor.
Disassemble hoist and check for
pressure of pilot pressure at
hoist brake. Repair, as
necessary.
Disassemble hoist and repair or
replace valve.
Disassemble hoist and repair or
replace primary drive.
Adjust or replace relief valve.
Reduce load. Refer to Load
Capacity Chart.
Repair or replace anti-two-block.
Add oil.
Remove line and clear
obstruction or replace lines.
Repair or replace pump.
Repair or replace control cable.
Check pressure delivery from
control valve and repair or
replace valve.
Low hydraulic oil level.
Restricted or broken supply line.
Malfunctioning hydraulic pump.
Worn valve spool.
Low hydraulic oil level.
Restricted or broken hydraulic
line.
Malfunctioning hydraulic pump.
Control cable broken, kinked or
disconnected.
Worn control valve spool.
Check valve in hoist sticking in
closed position.
Hoist drive motor defective.
Hoist brake not releasing.
Return relief valve in hoist stuck
in closed position.
Hoist primary drive assembly
damaged.
Relief valve in hoist control
valve inlet section set too low.
Load capacity exceeded.
Anti-two-block valve closed.
Low hydraulic oil level.
Restricted or broken hydraulic
line.
Malfunctioning hydraulic pump
section.
Control cable broken, kinked or
disconnected.
Worn control valve spool.
Cylinders extend or retract
erratically.
Hoist will not lower load or load
handling device.
Courtesy of Crane.Market
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