TM 5-3810-305-23
0009
CORRECTIVE ACTION - Continued
5.
With hydraulic oil at a working temperature, elevate boom to a 60 degree angle and suspend a
5 ton (4.54 metric ton) load on a two-part line 1 ft (305 m) off ground. Extend telescoping section
approximately 1/2 of full extension. Shut engine off. Disconnect hose from tube on left side of
boom. Extend cylinder at boom base. Some hydraulic oil should run out, but will stop. Pull boom
extend lever to the retract position and hold. Boom should hold its position.
a.
If boom retracts and no hydraulic oil comes out of tube, counterbalance valve must
be replaced.
b.
If boom retracts and hydraulic oil comes out of tube, boom extend cylinder is bypassing and
should be replaced (WP 0150).
MALFUNCTION
Counterbalance Valve Not Seating Properly.
CORRECTIVE ACTION
Replace counterbalance valve (WP 0150).
MALFUNCTION
O-ring Around Counterbalance Valve Damaged.
CORRECTIVE ACTION
Replace counterbalance valve (WP 0150).
MALFUNCTION
Boom Extend Cylinder Bypassing.
CORRECTIVE ACTION
1.
Repair boom extend cylinder (WP 0150).
2.
Replace boom extend cylinder (WP 0150).
END OF WORK PACKAGE
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03/15/2011Rel(1.8)root(tswp)wpno(T00014)