75
MAINTENANCE
CONDITION
POSSIBLE CAUSES
HOW TO CHECK
1. Valve wont open
No electrical power to valve
Manually activate valve with
ignition switch OFF. If stem
moves freely, check and
clean electrical connections.
Inspect Electrical system.
The two-pin connector at
each valve should have 12
volts with the ignition switch
and the Master ON/OFF Foot
Switch ON. Moving the Indi-
vidual Boom Valve Switch
should reverse the polarity.
2. Valve wont shut off
Valve Cone deteriorated
Pull fork under Individual
Boom Valve motor housing.
Pull motor and stem out of
the base. Inspect and make
repairs as necessary.
3. Leakage around bottom
of motor housing
O-Ring deteriorated
4. Blowing fuses
Short circuit in power
Disassemble valve and re-
place O-Ring's.
Inspect wires for worn insu-
lation and check connec-
tions.
5. Valve operating properly,
but pressure drop too high.
Obstruction in valve body Remove inlet and outlet con-
nections and inspect body.
TROUBLESHOOTING THE BOOM CONTROL VALVE
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