Reassembly - TM-10-3930-624-340093

loose. If the flange is to be reused, hone in the same

(5) Place the bushing dowel (8) between the

manner as the body fare.

two front bushings. Hold the bushings together,

(6) Handle the pump gears carefully when

and insert them face down into the pump bores. Do

inspecting. The pump must be replaced if following

not force the bushings into position. They will slide

i n s m o o t h l y i f p r o p e r l y aligned. P l a c e t h e

measurements are less than that specified. The

journal diameter is 0.872 in.. the length of the gear

preformed packing (6) and backup rings (5) on the

is 1.319 in., and the gear OD is 1.754 in. Check the

bushing shoulders.

gear teeth ends and remove any burrs with a small,

Place the two preformed packings (29) in the

fine hone. If the journal surfaces are blackened and

two small recesses in the face of the body on the

can be scratched with a penknife, they have lost

inlet side of the pump and place the body

their casehardening and the pump must be

preformed packing (4) in its recess around the

replaced.

bushings.

(7) Handle bushings carefully. The bore of the

(7) Place the priority valve spring (18) in the

bushing. which will be worn slightly oval, must not

valve spool (17), coat the spool with nil, and install

measure over 0.882 in. at the largest reading. The

it spring first, into the valve bore.

length of the bushing must not measure under

(8) Install the preformed packing (16) on the

1.055 in. Remove minor cuts or scratches by

valve plug (15), coat with oil and insert the plug

honing in a circular motion with an extra fine stone.

into the valve bore with the threaded hole outward.

Be sure the sharp edge between the face of the

Push in until it is flush with the face of the body.

bushing and the OD is not broken. Erosion on the

(9) To replace the seals (3) in the mounting

face of the bushing near the rectangular land and in

flange (2), first press in the nil seal with the lip

the lube oil slot indicates air in the system. Check

pointed in, then press in the oil seal with the lip

for air leaks on the suction side of the pump.

pointed out. Install the mounting flange (2) on the

(8) Check the diameter of the valve spool lands

pump, taking care not to damage the seals on the

(22, fig. 5-8) and replace the spool if the diameter is

shaft. Before sliding the end plate all the way down,

less than 0.748 in. at any point. Check the balance

check to see that all seals and backup rings are still

and flow orifices and clear with a fine wire if

in place.

necessary.

(10) Tighten the countersunk capscrews (1) to

(9) Check the valve spool spring (21) to see

secure the flange to the pump body. To insure

that it is not bent or deformed. Replace the spring if

proper gear meshing, rotate the drive shaft using a

the length is less than 3 1/2 in.

maximum torque of eight ft. lbs.

(10) Inspect the cone (25) for wear and

(11) Install the cone (25) and spring (24) into

the spool (22). Secure the parts in position with one

erosion and replace if damaged.

setscrew (23). Turn the setscrew in the same

(11) Inspect the cone valve spring (24).

number of turns required for removal. Lock in

Replace if bent or deformed.

d. Reassembly. (fig. 5-8.)

place with the remaining setscrew (23).

(12) Install the spool assembly in the relief

(1) Place the pump face up and install the two

port of the pump. Place the preformed packing

body dowels (28). tapping them in place with a

(20) on the plug (19). Install the relief valve spring

plastic hammer. Coat the body bores with light oil.

( 2 ) P l a c e the bushings (11), preformed

(18) and plug (19).

e. Installation.

packing (13), and backup ring (14) on the shoulder

Caution: Do n o t f o r c e t h e p u m p i n t o

at the rear of the pump. Hold in place with grease,

position. This will damage the bushing faces

if necessary. Place the bushing dowel (12) in the

and result in poor operation and short pump

holes in the flat side of the bushings.

Caution : Do not tap or force the

life.

bushings into the bores. They should drop to

(1) Install the pump carefully, sliding the

the bottom by their own weight.

pump shaft into the engine coupling. If it binds,

(3) Holding the bushings together, carefully

remove the pump and inspect the coupling and the

shaft for burrs or other damage.

align them and slide them, with the packing side

down. into the bores. Coat the faces and bores of

(2) When the pump is in place, install the two

the bushing with light oil. Be sure the bushings

close-fitting capscrews which help align the pump

bottom in the housing and the backup rings do not

with the engine. Install the remaining capscrews

fall off.

and tighten.

(4) Turn the pump body so that the priority

(3) Install the pump inlet line and tighten just

valve (15 through 18) is to the left. Place the drive

enough so the backup washer is flat against the side

of the pump. Do not over-tighen as this will damage

gear (9) in the top bore and the idler gear (10) in

the lower bore. Coat the journals and the gear faces

the pump housing threads.

with a light coat of oil.

(4) Install the pump outlet lines and tighten.

5-9