Hydraulic Cylinder

10-3990-203-13&P

v. Place screen (26, Fig. 5-11) and retaining ring

f. Coat o-rings (8, 9, and 10) on spool (7) with

(27) in the port on pump body. Place hydraulic hose

light grease and install in pump body (1).

coupling (9, Fig. 5-10) into the same hole and thread

it into place by hand. Tighten the coupling in place

g. Place lever (6) through hole in the top of spool

with a 3/4 inch open end wrench.

(7) and install setscrew (5) into very top of spool.

Tighten setscrew with a 1/8 inch allen wrench.

w. Remove breather plug (13, Fig. 5-11) and fill

reservoir with hydraulic fluid, Military Specification

h. Insert capscrew (28) through washer (29) and

MIL-H-5606C, NSN-9150-00-252-6383, or equiva-

install in pump body (1). Tighten screw with a 9/64

lent. Reinstall breather plug and tighten with a 7/16

inch allen wrench.

inch box wrench.

i. Install breather plug (13) into top of body (l).

NOTE

Do not tighten plug.

Reservoir should be filled to the bottom of

j. Insert plug (16) through gasket (17) and install

plug opening. The ramp should be in the

in pump body. Tighten plug with 4 ft lbs torque.

lower position.

k. Replace gasket (15) over relief valve (14) and

install to pump body. Tighten with 5 ft lbs torque.

5.5.9.2 Hydraulic Cylinder (Fig. 5-12)

5.5.9.2.1

Disassembly

l. Replace o-rings (23 and 22) on outlet seat (21).

Replace ball (20) in outlet seat. Reinstall spring (19)

a. The hydraulic cylinder must be removed from

and plug (18). Plug can be tightened with a 5/32 inch

the f ram e before it can be disassembled. To remove

allen wrench.

the cylinder, straighten and remove cotter pins (8

m. Reinstall outlet seat (21) and torque to 19-21

and 10) from clevis pins (7 and 9). Slide the clevis

pins out fo the frame (refer to Fig. 5-6).

ft lbs.

b. Disconnect hose (5 or 2, Fig. 5-10) from

cylinder (6).

c. The cylinder can now be removed and disas-

It is necessary, when reinstalling the outlet

sembled.

seat, to take care not to cut the o-rings.

d. With the cylinder fully retracted, push a small

screwdriver through port (2, Fig. 5-12). Using the

n. Clean or replace screen (25) in inlet adapter

screwdriver, unseat and shift lock ring (3) to the

(24) and install in pump body (1).

lower groove on rod (6).

o. Replace gasket (3) in reservoir (2) and install

reservoir to pump body (1) with four capscrews (4).

e. Slide the body assembly (6) apart from barren

assembly (l).

Tighten cap screws with a 3/16 inch allen wrench.

f. Remove lock ring (3), rod wiper (4), and rod

p. Place link (42) into slot in the top of pump body

(l) and place wave washers (43) in the same slot, one

seal (5).

on each side of the link. Align the hole in the link

NOTE

with the hole in pump body and insert pin (32).

Replacement parts are included in the hydrau-

q. Insert screw (30) through washer (31) and

lic cylinder repair kit no. 55559.

install in pump body. Tighten screw with a 1/4 inch

box wrench. Washer (31) will hold pin (32) in place.

5.5.9.2.2

Reassembly

r. Align holes in back of beam (34) with the hole

in the top of link (42). Slide wave washers (41) in

a. Replace seal (5) and wiper (4) over rod (6).

position on each side of the link.

b. Replace lock ring (3) over rod (6). Do not seat

s. Insert clevis pin (37) through the holes and

the lock ring in the upper groove.

place washer (39) over the end of clevis pin and push

c. Insert rod (6) into barrel (1) to the fully col-

cotter pin (38) through hole in clevis pin. Secure

lapsed position.

cotter pin.

t. Place assembled pump back on mounting plate

d. Push lock ring (3) until it seats into place on

rod (6) in upper groove.

(11, Fig. 5-10).

u. Align the holes in mounting plate (11) with the

e. Place the barrel assembly in place in the top

mounting holes in the pump and insert pump mounting

hydraulic cylinder bracket. Align the holes and

insert clevis pin (9) through the holes. Insert cotter

bolts (10). Tighten bolts with a 9/16 inch socket with

ratchet.

pin (10) through the hole at the end of the clevis pin.

5-17