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
Check the spool opera-
tion
Faulty
block
Normal
4
relief valve
The port relief valve is
faulty
Repair or replace the port re-
lief valve
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-
2. Check the pilot valve
-
sure.
normal.
3. Check the spool operation
Disconnect the bucket hose connected to the pipe at
-
connected hose.
-
sure.
spool is normal.
Lever to operate
Device to check
Relief valve
R1
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