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TM 10-4320-311-14
REMOVAL: Refer to Figure 5-1.
a.
Remove impeller locking bolt (1) and teflon washer (2).
b.
Unscrew impeller (3) in a counterclockwise direction.
NOTE
It may be necessary to use a small wood block and rubber mallet to tap the Impeller vanes so
Impeller breaks loose.
c.
Remove shims (4) and spring and spring seat [part of seal assembly (5); the seal will remain in the shaft
adapter].
d.
Remove wear plate (6) by removing bolts (7). Remove and discard O-ring (8).
e.
Remove shaft adapter (9) and seal; discard shaft seal.
INSPECTION:
a.
Inspect impeller for damage or wear.
b.
Inspect wear plate for damage or wear.
INSTALLATION:
a.
Install wear plate (6) with screws (7).
b.
Install new O-ring (8) between pump casing (10) and wear plate (6).
CAUTION
Insure that the stationary seal is Installed with the polished surface facing the impeller.
c.
Install new seal assembly (5) on shaft (9).
d.
Install shims (4) onto shaft (9).
e.
Install impeller (3) onto shaft (9) by turning clockwise.
f.
Position slot of shaft adapter (9) onto shaft key and push shaft adapter onto engine shaft.
g.
Secure with teflon seal (2) and impeller locking bolt (1).
NOTE
When replacing seal, also replace volute O-ring (refer to item 7, Figure 4-26), wear plate O-ring (8,
Figure 5-1), and four self-sealing screws (6, Figure 5-2).
h.
If a new Impeller and/or wear plate is installed or if the impeller clearance is to be changed, determine the shim
thickness required to obtain a clearance of 0.010 to 0.015 Inch (0.254 to 0.381 mm) by the following procedure:
5-6
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