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TM 5-4210-220-12
4-18. PUMP, PIPING, AND VALVES - Continued
(6)
While supporting the head assembly, carefully pull elevation bearing (18) out of head (6). Use extreme
care so as not to damage four O-rings (16) during removal of elevation bearing.
(7) Separate head (6) from body (17).
(8)
Remove O-rings (16) from elevation bearing (18).
(9)
Discard all O-rings.
(10)
Clean all parts using a brass bristle brush and wipe off using a clean, dry, lint-free cloth.
(11)
Inspect head (6) and body (17) sealing surfaces for scratches, corrosion or dirt that may cause a leak.
(12) Inspect elevation bearing, for being worn or out of round. Check O-ring grooves are free of indentations
or projection.
(13) Evidence of damage of any kind is cause for rejection. Replace component or assembly as required.
(14) Lubricate four O-rings (16) using silicone grease (item 27, Appendix E) and install into elevation bearing
grooves (18).
(15)
Lightly lubricate the elevation bearing (18) outside diameter, and the head (6) and body (17) inside
diameters using silicone grease (item 27, Appendix E).
(16)
Lift the head (6) and position between the lugs of the body (17).
(17)
Carefully slide elevation bearing into body (17) and through the head (6). Be sure to align the hole in the
head with the hole in the elevation bearing.
(18)
Install jam nut (7) and seal washer (8) onto bearing screw (9).
(19)
Install bearing screw (9) into head (6) until it seats. Tighten jam nut (7) onto seal washer (8) until snug.
(20)
Lubricate O-ring (15) using silicone grease (item 27, Appendix E) and install into end cap groove (13).
(21)
Install end cap (13) into body (17) and lock in place using retaining ring (14).
(22)
Raise cable mounting plate (5) into position. Align the mounting holes and install capscrews (4). Tighten
firmly.
(23)
Attach water sleeve link (3) to water sleeve (11) using capscrew (2) and nut (1). Tighten nut firmly.
(24) Set control handle of bumper turret to 'FOG' Cable adjustment is satisfactory. If water sleeve (11) is fully
retracted on the water tip (19).
(25)
Adjust control cable as detailed in steps 15 thru 18 of Control Cable Repair preceding.
4-283
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