Figure 7-2. Pump tolerances and wear limits.

TM 5-4320-273-14

b. Disassembly.

(1) Remove impeller (24) by inserting a rod into

each side of impeller. Remove flywheel screen from

engine and hold crankshaft with a pipe wrench. Im-

peller can now be loosened by turning coun-

terclockwise. If impeller cannot be loosened by hand

tap rods with a plastic hammer.

(2) Remove the shaft sleeve (25) and seal (26).

Retain the shims as a set. You will want to reinsert

the same shim thickness at reassembly unless related

parts are replaced.

(3) Remove the screws (27 and 28) and lock-

washers (13), and remove the intermediate bracket

(23).

(4) You should not remove the studs (29, 30, and

31) from the pump casing unless they are damaged

and require replacement.

c. Cleaning and Inspection.

(1) You should replace the pump seal (26) at each

overhaul. Always replace the complete seal assembly,

not individual parts.

WARNING

DRY CLEANING SOLVENT, P-D-680

or P-S 661, used to clean parts is

potentially dangerous to personnel

and property. Avoid repeated and

prolonged skin contact. DO NOT use

near open flame or excessive heat.

Flash point of solvent is 100 to 138F

(38 to 60C).

(2) Clean all remaining parts with cleaning

solvent (fed. spec. P-D-680); dry thoroughly.

(3) Inspect the impeller (24) for cracks, wear,

broken vanes, chips, distortion, and damaged threads.

(4) Inspect the wear ring (32) in the pump casing

Figure 7-2. Pump tolerances and wear limits.

for wear, cracks, and other damage. If the inspection

indicates wear or damage, you must replace the wear

ring.

(4) Remove the nuts (2), washers (3 and 4), and

(5) Inspect the pump casing for cracks, distor-

screws (5) that secure the lifting bail (6) and support

(7) to the discharge elbow (8).

tion, damaged threads, or other damage. If studs are

damaged, replace them.

(5) Remove the nuts (9) and lockwasher (10) and

(6) Inspect the intermediate bracket (23) for

remove discharge elbow (8) and gasket (11).

(6) Remove the nuts (12), lockwashers (13), and

cracks, distortion, scoring, and other damage; replace

screws (14) securing the base of the pump casing (15)

a damaged intermediate bracket.

(7) Inspect the O.P.W. fitting (16, 17, and 18) for

to the frame.

cracks, damaged threads, distortion, or other damage.

(7) Remove O.P.W. dust cap (16), gasket (17), and

Replace damaged parts. Always replace gasket (17).

adapter (18) from pump casing.

(8) Inspect cleanout cover (19) for cracks, distor-

(8) Remove the nuts (2) and washers (3) that

tion, or other damage. Replace if damaged. Always

secure the cleanout cover (19) and gasket (20) to the

replace gasket (20).

pump casing (15).

(9) Remove the nuts (21) and lockwashers (22)

d. Reassembly and Installation.

(1) Install the wear ring (32) if

you had removed

that secure the intermediate bracket (23) and the

it.

pump casing (15).

(2) Coat the stationary members of the pump

(10) Insert hook of a hoist device into discharge

seal (26) sparingly with light engine oil. Install the

of pump casing (15) and slide pump away from the

stationary seal parts in the bore of the intermediate

engine, Remove from frame.

7-3