1
Is the speed of the arm
cylinder within spec?
Within spec
Normal
Out-of-spec
2 Check the pilot valve
Faulty
Repair or replace the pilot
valve.
Normal
Check the spool opera-
tion
Faulty
block.
Normal
4
Test the port relief valve
with a replacement valve
The port relief valve faulty
Repair or replace the port re-
lief valve.
5
Check for leak inside the
arm cylinder
Faulty
Repair or replace the arm cyl-
inder.
1. Is the speed of the arm cylinder within spec?
2. Check the pilot valve.
“Arm cylinder does not move, 2. Check the pilot
valve”
3. Check the spool operation.
operation”
4. Test the port relief valve with a replacement valve.
the port relief valve”