Reassembly and Installation

d . Reassembly and Installation. Pump reassembly

properly seated stationary ring will result

and installation are essentially the reverse of the

in a leak when the pump is restored to

disassembly sequence. Refer to figures 3-13 and 3-14

service.

and to torque values in paragraph 1-3b(3). Give

(7) Lubricate the bore of the seal plate (32) with a

p a r t i c u l a r attention to the following:

light coat of oil, MIL-L-2104, grade 10. Install

(1) Install the splined coupling (53) on the engine

the O-ring on the stationary ring of the seal

with four capscrews (51).

assembly in the seal plate. Position the seal

plate on the intermediate bracket and secure

(2) Press the oil seal (50) in the seal seat of the

with eight nuts (19). Take care not to dislodge

intermediate bracket (42) so that the lip faces

the stationary ring during installation.

the bearing bore.

(8) Lubricate the internal diameter of the rubber

(3) Pack the ball bearing (48) with grease per MIL-

sleeve of the rotary portion of the seal with oil,

G-23827. Install the retaining ring (49) in the

MIL-L-2104, grade 10. One end of shaft sleeve

groove of the impeller shaft (44). Press the

(34) has a bevel on the internal diameter. Insert

ball bearing (48) into the shaft until it engages

the shaft sleeve into the rubber sleeve so that

the retaining ring. Install the second retaining

the beveled end is on the same end as the lapped

ring to retain the bearing.

seal face and approximately flush with the lapped

face of the rotating element.

(4) The bearing (48), pressed on the impeller shaft,

is a light push fit into the intermediate bracket

(9) Install the assembled shaft sleeve and rotary

(42). Install the assembled bearing and impeller

element of the shaft seal on the impeller shaft

shaft in the bracket. Press the seal (46) in the

so that the lapped surface of the rotary seal

bearing retainer (45) and position the assembled

faces the engine. Push the shaft sleeve onto the

shaft until it seats against the shaft shoulder.

seal and retainer in the bearing bore of the

intermediate bracket with the lip of the seal

Caution. Make sure that no dust or foreign material

facing the bearing. Retain the assembled parts

with the retaining ring (43).

is on the lapped surfaces of the seal ele-

ments as the lapped surfaces engage.

(5) Position the assembled intermediate bracket and

(10) If no parts except seal (33) have been replaced,

shaft, hoisting bracket (41 ) and guard (40) on the

the thickness of shims (28) which had been used

engine. Secure with eight capscrews (36 and 38)

between the shaft sleeve and impeller may be

and lockwashers (37 and 39). Tighten the cap-

reinstalled. If the impeller shaft, intermediate

screws to 15-20 ft-lbs.

bracket, seal plate, or impeller was replaced,

add shims between the impeller and shaft sleeve

(6) The shaft seal assembly (33) consists of sta-

to provide clearance between the impeller and

tionary ring and a rotary element as shown in

seal plate and equalize the distance between the

figure 3-14. The stationary ring uses an O-ring

impeller and housing parts. Refer to figure 3-14.

around its circumference to seal the stationary

Shims are provided in thicknesses of 0.005,

ring in the seat of the seal plate. The one face

0.010, and 0.030.

of the stationary ring is lapped and must face

outward so that it can be engaged by the mating

(11) Install the volute casing (21) and gasket (22).

face of the rotary seal. The rotary element of

Secure with eight nuts and torque to 15-20 ft-

the seal is held into engagement with the sta-

l b s . Make sure no rubbing occurs between

tionary ring by a spring which is part of the

the impeller and casing. If necessary, remove

seal assembly.

some of the shims that were installed between

the impeller and shaft sleeve.

Caution: Take care during the installation

of the

stationary ring so that the lapped

face is

(12) Refer to figure 3-13 and complete reassembly

not marred. Install the ring until it

bottoms

of the pump.

in the bore. A marred face or

an im-

3-14