TM 5-3805-281-24-1
Diagnostic Information
Part Name
Bucket Flow Control Valve
Arm Rod End Reduced
Arm Head End Reduced
Leakage Valve
Leakage Valve
Operational Function
To restrict oil flow to bucket circuit in
To reduce arm in drift caused by
To reduce arm drift caused by
combined operation of bucket, arm in,
leakage from the cylinder back
leakage from head end of
and boom up to ensure oil flows to
through control valve.
cylinder back through control
higher-loaded boom function to raise
valve.
boom.
Control Problems
Pilot valves and poppet valve sticking or
Sticking or stuck check valve or
Check valve does not open if
stuck.
pilot valve. No pilot pressure
pilot valve is seized.
signal to shift pilot spool.
Machine Symptoms
Bucket speed is slow if poppet valve is
If check valve does not open
If check valve does not open
stuck closed or pilot valve is stuck
fully, arm in speed is slow. Arm
fully, arm out speed decreases.
causing poppet valve to remain closed.
drifts down. Arm in speed is slow
If check valve seized open, arm
Boom is not raised in combined
or jerky if check valve sticking.
drift increases. Also inspect relief
operation with poppet valve stuck open
valve.
or pilot valves are stuck open keeping
Arm out speed becomes slow or
the poppet valve open.
jerky if check valve sticking.
Laptop Computer
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Self-Diagnostic Function
Laptop Computer
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Monitoring Function
Harness Check
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Notes
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Description of Operation
See Bucket Flow Control Valve
See Arm Rod End and Boom
See Arm Head End Reduced
Operation in Group 9025-05.
Reduced Leakage Valves
Leakage Valve Operation in
Operation in Group 9025-05.
Group 9025-05.
9025
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CED,TX08227,3177
1904JUN988/9
6-116
