Takeuchi TB 250 User Manual

5-24
5
BOOM
TROUBLESHOOTING
BOOM
The boom cylinder does not move
1
Check the operation of
actuators other than of
the boom cylinder
Normal
2 Check the pilot valve
Faulty
Repair
or replace the pilot
valve
Normal
3
Check
the spool opera-
tion
Faulty
Repair
or replace the housing
block
Normal
4
T
est by replacing the port
relief valve
Problem solved
The port relief valve is
faulty
Repair
or replace the port re-
lief valve
No change
5 Check the boom cylinder
.
Faulty
Repair
or replace the boom
cylinder
1.Check the operation of actuators other than of the
boom cylinder
Determine if only the boom cylinder is faulty by check-
ing
the operation of actuators for the devices listed in
the table on the right. If one of them is faulty, check the
main relief valve and the hydraulic pump (main).
“5-5”
Lever to operate
Device to check
Relief valve Pump
Right travel
TB228,235: R2 TB228,235: P2
TB250: R1 TB250: P1

Takeuchi TB 250 Specifications

General

Brand	Takeuchi
Model	TB 250
Category	Compact Excavator
Language	English