DISASSEMBLY (cont) - TM-55-1905-223-24-70150

TM 55-1905-223-24-7

NOTE

When removing manifold, be careful of loose parts.

(2)

Lift manifold (13) off pump and set aside.

(3)

Lift valve plate (21) off pump and set aside.

d. Perform the following steps to replace each of three preformed packings (23, 34, and 38).

(1)

Rotate pump shaft to position where one of the flat valve diaphragms (25) is at its highest point.

(2)

Lift side of diaphragm (25) to expose the drilled crosshole on the valve plunger (36).

(3)

Remove machine screw (22), preformed packing (23), follower (24), flat valve diaphragm (25), and pump

plunger (26). Discard preformed packing (23).

(4)

Replace machine screw (22) in valve plunger (36).

(5)

Tap machine screw (22) lightly with hammer. This will permit removal of the piston set by lifting machine

screw.

(6)

Lift up on machine screw (22) and remove helical compression spring (40), helical compression spring seat

(39), preformed packing (38), helical compression spring (37), valve plunger (36), valve cylinder (35),

preformed packing (34), ring spacer (33), ball bearing (32), pump piston (31), foot (30), and foot retainer (29).

Discard preformed packings (38 and 34).

(7)

Assemble foot retainer (29), foot (30), pump piston (31), ball bearing (32), ring spacer (33), new preformed

packing (34), valve cylinder (35), valve plunger (36), helical compression spring (37), new preformed packing

(38), helical compression spring seat (39), helical compression spring (40), and insert machine screw (22)

into valve plunger (36) threads.

(8)

Install piston set and remove machine screw (22).

(9)

Install pump plunger (26), flat valve diaphragm (25), follower (24), and new preformed packing (23).

(10) Lightly coat machine screw (22) with Loctite and install.

e. Turn axial pistons pump over and lay down on cylinder housing (28) face.

Place cellophane tape over shaft keyway to prevent keyway from scarring plain seals (51).

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