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 TM 55-1905-217-34
(4) Remove oil inlet fitting (6) from end of pump housing. Inlet check valve (10) and spring (11) will drop out of
housing (1).
(5) Back out bleeder screw (4) and remove ball (2).
c. Cleaning, Inspection, and Repair.
(1) Clean all parts with solvent, (FED. SPEC. PD-680) and dry thoroughly.
(2) Pump housing.
(a) Check for cracks and other visible damage. Bore of cylinder must be smooth with no pitting or scoring. All
threads must be checked.
(b) It is not necessary to remove plug (7, figure 4-23) unless there has been leakage at threads.
(c) Check bleed ball valve (2) and its seat in the housing. Replace ball valve if damaged.
(d) Replace gasket (3).
(3) Inlet fitting (6).
(a) Examine internal and external threads. Inspect inlet check valve seat for nicks or scratches.
(b) Replace gaskets (5 and 9) and backup ring (8).
(c) Inspect inlet check valve ball (10) and spring (11). Replace if damaged.
(4) Plunger (22). Check plunger for scoring on large diameter and on plunger shank where it rides in gland (29). A
wear pattern may be evident but no scores or scratches should be present. Replace gaskets (13 and 15) and backup ring
(14). Examine discharge check valve (16), spring (17), and check valve seat (12). Replace any damaged parts.
(5) Plunger gland (29). With gasket (20) and backup ring (21) removed, check gland on plunger shank to be sure it
does not bind. Replace gaskets to be sure it does not bind. Replace gaskets (18 and 20) and backup rings (19 and 21).
d. Reassembly.
(1) Install inlet check valve spring (11, fig. 4-23) and ball (10) into housing (1). With gaskets (5 and 9) and back-
up ring (8) on inlet fitting (6), install fitting into housing. Tighten fitting securely being sure that inlet check valve (10)
seats properly in end of inlet fitting (6).
(2) Install discharge check valve spring (17) and ball (16) into plunger (22). With gasket (13) in place, thread
valve seat (12) into plunger and tighten securely.
(3) Insert plunger (22) into housing bottoming plunger bore. Install plunger gland (29) being sure that external
gasket (18) is closest to leading edge. Press gland (29) in until groove for retaining ring is uncovered, then insert ring
(28).
(4) Drop bleed ball valve (2) into place and with gasket (3) in position insert bleed screw (4). Tighten bleed screw
securely.
(5) Install link assembly (27) to plunger (22) and operating lever (30). Place operating lever (30) in position and
insert clevis pin (24) and retaining ring (23). Put other side of link on and secure with clip or cotter pin.
e. Installation. Install the hand pump (TM 55-1905-217-12, para 4-62).
Section III. HYDRAULIC STEERING SYSTEM
4-10. General
A description of the hydraulic steering system is included in the Operator and Organizational Maintenance Manual TM
55-1905-217-12.
4-11. Hydraulic Pump Drive
a. General. Steering hydraulic pumps are mounted aft on the outboard engine of each propulsion unit. Pump drive
components used on hull number 8500 thru 3519 are shown in figure 4- 24. Drive components used on hull
number 8520 thru 8560 and 8580 thru 8619 are similar.
4-37
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