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TM 10-4320-316-14
4-26.
PUMP ASSEMBLY REPAIR AND REPLACEMENT. - Continued.
b.
Inspection.
(1) Inspect all metal parts for cracks, corrosion, or broken fittings.
(2) Check all threaded parts for damaged threads.
(3) Inspect inside of cover plate for wear damage.
(4) Check impeller for damage or wear.
(5) Inspect wear plate for damage or wear.
(6) Inspect pump body for cracks, corrosion, and evidence of leaks.
c.
Repair. Repair is limited to replacement of parts found defective during inspection.
d.
Installation.
NOTE
Be careful not to damage rubber gasket of shaft seal during installation.
(1) Install shaft seal (23).
(2) Install three studs (22) into pump body (20).
(3) Apply silicone compound to plug (21) and install plug into pump body (20).
(4) Install pump body (20) onto engine with new three lock washers (19) and three screws (18).
(5) Apply silicone compound to shaft seal (23).
(6) Install wear plate (13) and three screws (12).
CAUTION
Failure to set the clearance between the wear plate and the impeller will cause
the pump to function badly or damage the pump. Be sure that the clearance
between the wear plate and the impeller is between 0.010 and 0.015 inches
(0.254 to 0.381 mm).
(7) Determine the shim thickness required to obtain a clearance of 0.010 to 0.015 inch (0.254 to 0.381 mm)
between impeller and wear plate by the following procedure:
(a) Install O-ring (16), key (15), adapter shaft (14), and screw (8) onto engine shaft.
CAUTION
Improper measurement of clearance will damage pump or reduce pump
capacity. To insure proper measurement, be sure that all shims are pressed
against adapter shaft during measurement.
4-56
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