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 TM 55-1905-217-34
plate with arrow pointing in direction of shaft rotation. Lubricate rotor and ring with clean hydraulic oil.
(5) If wear plate bushing was removed, press a new bushing into wear plate bore. Install plate on
locating pin against ring. Install two screws and tighten.
f. Cover End Reassembly.
(1) Carefully install pump cartridge on drive shaft and seat it firmly in place in the body.
(2) Install the cover making certain that the two locating pins fit into the holes inside the cover. Seat the
cover firmly and secure in place with four cover bolts. The threads of the bolts should be oiled lightly and
torqued to 85-95 ft. lbs.
(3) After the unit has been completely reassembled, pour a small quantity of clean hydraulic oil into the
cover inlet port. Rotate drive shaft several turns by hand to check for free rotation and to make sure of
complete lubrication of the cartridge parts. Cap the pump inlet and outlet ports to prevent entrance of foreign
materials.
g. Installation. Install the pump (para 4-11 d).
4-19. Ramp Hoist Control Valve.
a. General. The control valve is a four-way directional valve with an inlet port, two motor ports, and an
outlet port. The valve consists of a body incorporating a sliding spool, centering springs, and check valves.
The inlet section contains a relief valve assembly which is set at 2000 psi. The control valve used on hull
number 8500 thru 8519 is a Vickers CM2-NO2-R20B-L30 and the control valve used on hull number 8520 thru
8560 and 8580 thru 8619 is a Vickers CM3N02R20-BL-30. The two valves are similar except for size.
Instructions in following paragraphs apply to both.
b. Removal. Remove the control valve (TM 55-1905-217-12, para 4-89).
c. Disassembly. See figure 4-48.
4-76
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