1
Check the operation of
actuators other than of
the arm 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 arm cylinder.
Faulty
Repair or inspect the arm cyl-
inder
1. Check the operation of actuators other than of the
arm cylinder
the operation of actuators for the devices listed in the
If it is faulty, check the main relief valve and the hydrau-
2. Check the pilot valve
normal.
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