5-30
5
BOOM
TROUBLESHOOTING
Spontaneous drop of the boom cylinder is too large
1
Is the spontaneous drop
of the boom cylinder with-
in specs?
W
ithin specs
Normal
Out-of-specs
2
Check
for leak inside the
boom cylinder
Faulty
Repair
or replace the boom
cylinder
Normal
3
T
est 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 Replace the housing block.
1. Is the spontaneous drop of the boom cylinder with-
in specs?
“2. Service data, Performance criteria”
2. Check for leak inside the boom cylinder
“5-27 and 28”
3. Test by replacing the port relief valve
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