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TM 5-4210-220-12
4-18. PUMP, PIPING, AND VALVES - Continued
(21)
Attach gasket (35) and mounting plate (8) to base using capscrews (33) and lockwashers (34). Tighten
capscrews to 14 ft lb (19 Nm).
(22)
Install O-rings (30) into grooves of the rotation bearing (32).
(23)
Install rotation bearing (32) into base (26) and push in until it contacts the bearing shoulder.
(24)
Install O-ring (31) on chamfered edge of base (26).
(25)
Assemble the base (26) and body (29) together. Be sure O-ring (31) is in place.
(26)
Slide O-ring (27) onto threaded end of rotation tube (17), past first O-ring groove and up to the collar.
(27)
Install rotation tube (17) through body hole (29), rotation bearing, and the base hole (26). Align rotation
tube collar to mounting hole and install screw (28).
(28) Invert the turret and balance on body end of rotation tube (17).
(29)
Install O-ring (25) into the rotation tube groove from the threaded end of the rotation tube.
(30)
Install O-ring in seal bearing groove (24).
(31)
Install seal bearing (24) and ball bearing (22) into base (26).
(32)
Install bearing retainer (21) using four screws (19) and lockwashers (20). Tighten screws firmly.
(33)
Set key (10) into keyway on rotation tube (17). Align keyways and slide link mount (14) onto rotation
tube.
(34)
Install rotation nut (16) and tighten until body cannot be turned Unscrew rotation nut about 1/4 turn or
until body can be rotated freely. Tighten setscrew (15) firmly.
(35)
Apply white grease (item 34, Appendix E) to the entire length of the elevation shaft (1) and install it into
the rotation tube (17) from the base end. Use care not to damage the bushing in the body end of the
rotation tube.
(36)
Install column link (11) into link mount (14) using stud (12) and new locknuts (13).
(37)
Install cable (9) through mounting plate (8) and retain using conduit clamp (7), capscrew (4), and
lockwasher (5).
(38)
Install head (6) as detailed in Head Repair, steps 10 thru 26.
(39)
Attach elevation link (3) to elevation shaft (1) using roll pin (2).
(40)
Install bumper turret as detailed in INSTALLATION preceding.
4-287
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