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TM 5-4210-220-12
4-18. PUMP, PIPING, AND VALVES - Continued
(1)
Remove bumper turret as detailed in REMOVAL preceding.
(2)
Remove roll pin (2) and pull elevation link (3) from elevation shaft (1).
(3)
Remove head (6) as detailed in step 1 thru 8 of Head Repair preceding.
(4)
Remove capscrew (4) and lockwasher (5) that retains conduit clamp (7) to the mounting plate (8) and pull
control cable through mounting plate.
(5)
Remove column link (11) from link mount (14) by removing stud (12) and locknuts (13).
(6)
Loosen setscrew (15) and remove rotation nut (16) from rotation tube (17).
(7)
Pry the link mount (14) and key (10) from rotation tube (17).
(8)
Remove four screws (19) and lockwashers (20) and slide bearing retainer (21) off shaft (1).
(9)
Pull elevation shaft (1) out through the top of the base (26). Use extreme care so as not to damage the
bushing in the top of the rotation tube.
(10)
Remove screw (28) that retains the rotation tube (17) to the body (29).
(11)
Pull the rotation tube assembly (17) out through the bottom of the body (29).
(12)
Remove O-rings (25 and 27) from rotation tube assembly (17).
(13)
Separate the body (29) from the base (26).
(14)
Remove the rotation bearing (32) and O-rings (30, 31) from the base (26).
(15)
Remove the ball bearing (22) and bearing seal (24) from the base (26). Remove O-ring (23) and discard.
(16)
Remove capscrews (33) and lockwashers (34). Remove mounting plate (8), and gasket (35) from the
base (26).
NOTE
Small lime deposits can be dissolved by soaking components in acetic acid (item 1, Appendix
E) and gently rubbing them with a brass bristle brush.
(17) Remove lime deposits, scale or corrosion from the body, base, head, rotation tube, and shaft using a
brass bristle brush.
(18)
Wipe all components using a clean, dry, lint free cloth.
(19) Inspect all components for excessive corrosion at sealing surfaces, cracks, or wear that may cause leaks.
(20)
Evidence of damage of any kind is cause for rejection. Replace components or assembly as required.
4-285
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