Reassembly - TM-5-4320-258-340067

TM 5-4320-258-34

the shaft lightly with oil and slide the seal rotating

rough, catching, or binding operation; replace damaged

member (20) in place on the shaft.

bearings.

(5) If the same impeller (15) and wear plate

(11) Inspect the impeller shaft for distortion

(11) are reassembled and no clearance change is

and damaged retaining ring grooves, keyways, and

indicated, make sure that the same thickness of shims '

threads. Clean up damaged retaining ring grooves or

(17 and 18) is used. If a new impeller and / or wear

keyways with a fine stone. Repair damaged threads

plate is to be installed, or if the impeller clearance is to

with a thread chaser. Replace the shaft if it is damaged

be changed, determine the shim thickness required to

beyond repair.

obtain a clearance of 0.010 to 0.020 inch between the

(12) Inspect the bearing housing for cracks,

impeller and wear plate as follows:

distortion, or scored or burred bearing seats. Remove

(a) Install impeller (15) on shaft (39)

nicks or burrs from the bearing seats with a fine stone.

Clean up damaged threads with a thread die. Replace a

without shims. Be sure that it is seated firmly against

damaged bearing housing.

the shaft shoulder.

c. Reassembly. Reassemble the pump by

(b) Install volute (12), with wear plate

reversing the disassembly sequence. Refer to figures 5-

( 11 ) assembled, and secure with screws (6) and lock

1 and 5-2. Note the following:

washers (7).

(1) Press bearings (36 and 38, fig. 5-2)

onto the impeller shaft (39). If bearings slide onto the

impeller (15) to the face of the wear plate ( 11) using a

shaft by hand, they are too loose and the bearings and /

feeler gage.

(d) Select shims (17 and 18) to equal

or shaft must be replaced. Secure bearings to the shaft

with retaining rings (35 and 37).

the dimension obtained less 0.010 to 0.020 inch for

(2) Pack the bearings, bearing cap, and the

clearance.

area between the bearings in the bearing housing with

(6) After assembly, check the impeller

MIL-G-10924 grease.

shaft for free rotation. It must turn freely without

(3) Press grease seal (41) into the bearing

catching or binding. If binding is evident, disassemble

housing (40) and grease seal (33) into the bearing cap

and correct the condition upon reassembly.

(32) before installing the shaft and bearings in the

(7) Install the pump on the engine and skid

bearing housing.

(TM 5-4320-258-12).

(4) Press the seal stationary member (23)

into seal plate (24) before installing the plate. Lubricate

5-6