TROUBLESHOOTING
BOOM
7
5
BOOM 5G0AX001
Spontaneous drop of the boom cylinder is too large.
1. Is the spontaneous drop of the boom cylinder within
specs?
“2. Service data, Performance criteria”
2. Check for leak inside the boom cylinder.
“Boom cylinder operation is slow or lacks force,
5. Check the boom cylinder”
3. Test by replacing the port relief valve.
“The boom cylinder does not move, 4. Test by
replacing the port relief valve”
1
Is the spontaneous drop
of the boom cylinder with-
in specs?
Within specs
Normal
Out-of-specs
2
Check for leak inside the
boom cylinder.
Faulty
Repair or replace the boom
cylinder.
Normal
3
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
Oil leak inside the control
valve.
Faulty
Replace the housing block.