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TM 5-4210-220-12
4-18. PUMP, PIPING, AND VALVES-Continued
(5)
Inspect piston (25), connector plates (19), and driver arm (20) pivot holes for being out-of-round.
Replace as necessary
(6)
Inspect piston pin (26) and pivot pin (21) for grooves, bends, or damage that will not allow the valve
to operate properly.
(7)
Install driver arm (20) onto driver (17). Apply an opposing to and fro twisting action to the driver arm
while holding the driver. If the driver arm twists more than 0.125 in. (3.175 mm) replace both components.
(8)
Inspect transfer tube (31) for corrosion, dents, or for being out-of-round. Replace transfer tube if
any damage is found.
ASSEMBLY
(1)
Lubricate the upper drive seal (13) with silicone grease (item 27, Appendix E) and insert the seal into
the driver hole of the cylinder body (3).
(2)
Lubricate the pivot pin (21) with silicone grease (item 27, Appendix E). Install one connector plate
(19), driver arm (20), the second connector plate (19), and the pivot pin washer (22) on pivot pin
(21). Install the pivot pin retainer (23) into the pivot pin (21) and spread the prongs apart.
(3)
Lubricate the driver (17) and seals using silicone grease (item 27, Appendix E). Install the lower drive
seal (14), drive seal retainer (15) and back-up washer (16) onto the driver (17).
(4)
Install retaining ring (18) onto driver (17).
(5)
Insert the driver arm/connector plate assembly into the cylinder body (3) opening and center it with
the driver hole in the cylinder body. Be sure recess on connection plates faces the stop screw side of
the body as shown.
(6)
Install the driver (17) into the cylinder body (3). Engage the square drive of the driver (17) with the
square hole in the driver arm (20).
(7)
Install the pointer bearing (12) and indicator pointer (11).
(8)
Install the retainer ring (10) onto the driver (17).
(9)
Lubricate gasket (30) and install into cylinder body (3) groove.
(10)
Assemble piston end of connecting plates insert the connector plate spacer (24) between the
connector plates (19).
(11)
Carefully slide piston (25) onto connector plates (19). Aline the holes and install the piston pin
(26). Lubricate the piston bearings (27 and 29) and seal (28) with silicone grease (item 27, Appendix
E) and install on the piston.
(12)
Lubricate the cylinder (9) inner bore with silicone grease (item 27, Appendix E) and install the
piston assembly. Slide the cylinder until it contacts the cylinder body (3).
4-251
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