SECTION 3 – TROUBLESHOOTING
3120933 Rev. 0 USTC 3-11
TROUBLE PROBABLE CAUSE REMEDY
Table 3-4. Hydraulic Components (continued)
Worn control valve.
Hydraulic lines incorrectly
connected at control valve.
Holding valve in telescope
cylinder stuck in open position.
Relief valve in telescope section
of control valve set too low.
Malfunctioning holding valve.
Defective cylinder packing.
Worn control valve spool.
Hydraulic oil level low.
Restricted or broken supply line.
Malfunctioning hydraulic pump
section.
Worn control valve spool.
Extend and retract cables
require adjustment.
Cable nylon collar locking nuts
or threaded end of cables
stripped.
Cable sheave bushings defective
because of cable overtightening.
Lack of lubricant on boom
sections.
Wear pads out of adjustment or
worn.
One or more boom sections
distorted.
Check pressure delivery from
control valve and repair or
replace valve.
Connect hydraulic lines properly.
Check for presence of pilot
pressure at return valve and
repair or replace.
Adjust or replace relief valve.
Remove and repair telescope
cylinder.
Remove and repair cylinder.
Repair or replace valve section.
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.
Adjust cables.
Replace nuts and applicable
cables. Adjust cables.
Replace sheaves and lubricate.
Adjust cables.
Lubricate boom sections.
Adjust or replace wear pads.
Repair or replace boom sections.
Boom will not telescope in
(continued).
Boom retracts with control lever
in neutral.
Boom telescoping action erratic.
Courtesy of Crane.Market
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