USTC 2500 jbt - Page 32

SECTION 3 – TROUBLESHOOTING
3-10 USTC January 15, 2001
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.
Repair or replace motor.
Adjust or replace relief valve.
Repair or replace sticking valve.
Repair or replace control cable.
Add oil.
Repair or replace pump.
Check pressure delivery from
control valve and repair or
replace valve.
Connect hydraulic lines properly.
Repair or replace cylinder.
Repair or replace valve.
Adjust or replace relief valve.
Replace valve or switch.
Repair or replace sticking valve.
Repair or replace control cable.
Add oil.
Remove line and clear
obstruction or replace line.
Repair or replace pump.
Repair or replace cylinder.
Hydraulic oil level low.
Restricted or broken supply line.
Malfunctioning hydraulic pump.
Worn control valve spool.
Worn or defective swing motor.
Swing circuit relief vale set too
low.
Check valve in telescope section
stuck in closed position.
Control cable broken, kinked or
disconnected.
Hydraulic oil level low.
Malfunctioning hydraulic pump.
Worn control valve spool.
Hydraulic lines incorrectly
connected at control valve.
Excessive oil leaking past
cylinder piston seal.
Check valve in telescope
cylinder stuck in closed position.
Main relief valve set too low.
Anti-two-block valve defective or
switch stuck.
Check valve in telescope section
stuck in closed position.
Control cable broken, kinked or
disconnected.
Hydraulic oil level low.
Restricted or broken supply line.
Malfunctioning hydraulic pump.
Excessive oil leak past cylinder
piston seal.
Swing motor operation slow.
TROUBLE PROBABLE CAUSE REMEDY
Table 3-4. Hydraulic Components (continued)
Boom will not telescope out.
Boom will not telescope in.
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