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D-2) Impeller, Cutters and Volute Service

D-2.1) Disassembly and Inspection:

To obtain access to the impeller (23) or shredding ring (25),
first remove screw (35) and washer (34). Then holding the
motor shaft stationary with a screwdriver, tap the radial
cutter (32) loose in the counter-clockwise direction and
remove. (Heat may be needed to break the screw (35)
loose.)

Next remove nuts (30) and washers (11) from stud (31) and
pull the body (28) and square rings (29) on 2HP and (20)
on 3, 5, 7.5HP, from the rest of the pump. Remove shims
(33) from shaft, then impeller (23) can be removed by
turning it counter-clockwise while holding stationary the
motor shaft with a screwdriver.

NOTE:

With the impeller

(23) removed, the seal spring is relaxed and some oil may
seep from the seal cavity.

DO NOT

store this pump without

the impeller (23) in place to hold the seal shut.

To remove or reverse the shredding ring (25) first remove
the three flat head allen screws (27) and lift the throat (26)
out of the body (28). The shredding ring (25) is press fitted
in the body (28) and must be removed with an arbor press.

After a number of years of service or whenever the
shredding ring (25) cutting edges dull, the part can be
pressed out of the body (28) and reversed to utilize the
opposite cutting edges and then be replaced in the body
(28). To maintain efficient grinder pump operation, care
should be taken to keep both the radial cutter (32) and
shredding ring (25) cutting edges sharp. Neither part can
be sharpened to renew the cutting ability. The radial cutter
(32) must be replaced and the shredding ring either
reversed or replaced.

D-2.2) Reassembly:

To replace impeller (23) on shaft, turn clockwise while
holding shaft stationary with a screwdriver. Then replace
shims (33) on motor shaft. Important that the same quantity
be replaced as removed.

Next install shredding ring (25) by pressing into body (28)
with the use of an arbor press. Then insert throat (26) into
body (28) with three flat head allen screws (27). Apply a
thin coat of petroleum jelly to the square ring (29) on 2 HP
and (20) on 3, 5, 7-1/2 HP, and place on body (28). Place
motor assembly on body (28), being careful not to damage
square rings (20) & (29). Place washers (11) and nuts (30)
on studs (31) and tighten. Screw radial cutter (32) on shaft
clockwise. Hold motor shaft stationary with screwdriver and
tighten. Then replace washer (34) and screw (35). Radial
cutter (32) should be flush with shredding ring (25) on
suction side to within

.020.

D-3) OUTER SHAFT SEAL SERVICE:

CAUTION !

HANDLE SEAL PARTS WITH EXTREME CARE. DO

NOT SCRATCH OR MAR LAPPED SURFACES.

D-3.1) Disassembly and Inspection:
Outer Seal-

To expose shaft seal (21) for examination

disassemble volute, cutter and impeller as outlined in
paragraph D-2.1. Drain oil from seal cavity as outlined in
paragraph D-1.3. To inspect seal further, remove retaining
ring (21d), spring (21c) and rotating member (21b) from
shaft (see Figure 4).

PUMP END

(OUTBOARD END)

MOTOR END

(INBOARD END)

SEAL

ASSEMBLY (21)

Seal Plate (19)

Intermediate (6)

Spring (5c)

Rotating Member (5b)

Stationary (5a)

Fig. 4