Takeuchi TB 250, Руководство по ремонту

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5-36
5
BUCKET
TROUBLESHOOTING
BUCKET
Bucket cylinder does not move or lacks force
1
Check the operation of
actuators other than of
the bucket 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
Test 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 bucket cylin-
der.
Faulty
Repair or replace the bucket
cylinder
1. Check the operation of actuators other than of the
bucket cylinder
Determine if only the bucket 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”
2. Check the pilot valve
Disconnect the hose connecting the pilot valve and the
control valve (bucket block) from the control valve. Fit
the pressure gauge to the hose just disconnected.
• Operate the lever (bucket) and measure the pres-
sure.
• If the pressure is between 0 and 3.4 MPa depending
on the lever angle, the pilot valve is normal.
3. Check the spool operation
“5-32”
Lever to operate
Device to check
Relief valve Pump
Right travel
TB228, 235: R2 TB228, 235: P2
TB250: R1 TB250: P1
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