TM 9-2350-256-34
0050 00
With the APU emergency winch control valve in the CLOSED position, and the system selector valve in the AUXILIARY
position, the pressure is directed to the spade combination control valve and the boom combination control valve (port no. 33) is
blocked. The oil then flows over the relief valve in the system selector valve and returns to the reservoir (port no. 236). With the
spade combination control valve placed in the LOWER position, pump pressure is directed to the back end of the spade cylinder
(port no. 60). The opposite end is ported to the tank return (port no. 235). The differential across the piston causes the rod to
extend, lowering the spade.
With the APU emergency winch control valve in the CLOSED position, the impact wrench disconnected, and the system
selector valve placed in the REFUEL position, pump pressure is directed to the adjustable flow regulator (port IN) and the
four-way selector valve. The flow of the hydraulic pressure to the pressure side of the four-way selector valve can be varied by
the adjustable flow regulator. Placing the four-way selector valve in the REFUEL position, directs the auxiliary pump pressure
to the gear-type refuel pump motor (port no. 65), which is coupled to and drives the refuel pump. The hydraulic oil (port no. 66)
returns to the tank after passing through the refuel pump motor. Placing the four-way selector valve in the DEFUEL position
causes the opposite motor and pump rotation.
With the impact wrench hoses connected, the APU emergency winch control valve in the CLOSED position, and the system
selector valve in the REFUEL position, the hydraulic pressure is directed to the adjustable flow regulator and is blocked at the
four-way selector valve, which is in the closed position. Pressure is then directed through the impact wrench and returns to the
reservoir (port no. 245).
END OF WORK PACKAGE
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