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 TM 55-1905-223-24-18-2
1. Remove shoulder shaft (3) from motor shaft.
REPAIR
Repair of reduction gear cooling water centrifugal pump consist of replacing gasket (6), centrifugal pump
impeller (12), shaft seal assembly (13), and shoulder shaft (5).
ASSEMBLY
a. Position support head (6) on electric motor (1). Install four hex head capscrews (5). Tighten to 10 to
15 ft-lb torque (13.6 to 20.3 Nm).
b. Install shoulder shaft (3) onto motor shaft.
c. Install setscrew (2) in shoulder shaft (3) but do not tighten at this time.
d. Place shaft seal assembly (7) onto shoulder shaft (3) followed by impeller (13). Attach with machine
bolt (11) and flat washer (12).
e. Tighten machine bolt to 2 to 4 ft-lb torque (2.7 to 5.4 Nm).
f. Position gasket (10) on support head (6) and attach casing (9) with four hex head capscrews (14).
Tighten to 25 ft-lb torque (33.9 Nm).
g. Replace two plugs (8).
h. Adjust impeller running clearance.
(1) Move shoulder shaft (3) forward (towards casing) until impeller (13) is touching casing (9).
(2) Insert feeler gauge between shoulder on shaft and nose of support head (6) Measure gap.
(3) Add 0.010 inch to feeler gauge and move shoulder shaft back (toward motor) until feeler
goes in between shoulder on shaft and nose of support head.
(4) Tighten setscrew (2) to 5 to 6 ft-lb torque (6.8 to 8.1 Nm).
(5) Remove feeler gauge.
(6) Pump replaced as specified in paragraph 2-110 .
3-404
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