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TM 10-4930-250-13&P
(2)
Remove rotor cover gasket (3) and inspect for damage. Replace if damaged.
NOTE
A new pump rotor vane is 7/16 in. high. Replace vane if height is 9/32 in. or less. A vane
that does not make good contact with pump chamber will cause loss of suction.
(3)
Remove the five vanes (4) from rotor (5). Inspect vanes (4) for damage and wear.
(4)
Remove rotor key (6). Inspect for damage or deformation. Replace if damaged or deformed.
(5)
Remove rotor (5). Inspect for damage. Scratches will not affect the rotor; however, burrs should be removed.
NOTE
Carefully examine shaft seal assembly (7) for signs of fluid leakage at the shaft weep hole.
Note arrangement of components of the shaft seal assembly.
(6)
Remove snap ring (8) that secures seal assembly (7) to armature (9) shaft.
(7)
Remove shaft seal assembly (7), noting position of assembly components. Discard shaft seal assembly (7).
NOTE
If electrical disassembly procedures are to be performed refer to the procedures beginning
with paragraph c. of this repair procedure.
(8)
Inspect pump cavity for damage and foreign material. Clean cavity as required. Replace pump housing (10) if
cavity wall is damaged.
(9)
Remove bypass valve cap (11). Inspect valve cap gasket (12), replace if damaged.
(10)
Remove bypass spring (13) and bypass valve (14). Inspect bypass valve (14) seat for damage or deterioration.
Replace bypass valve (14) if damaged or wom.
(11)
Clean bypass valve cavity of pump housing (10).
(12)
Remove the four bolts (15) that attach inlet flange (16) to pump housing (10).
(13)
Remove and discard inlet flange gasket (17).
(14)
Remove and clean inlet screen (18).
(15)
Remove inlet check valve (19) from pump housing (10).
(16)
Operate the check valve (19) by hand to ensure freedom of movement. Inspect for wear or damage. If the check
valve (19) is worn or damaged or does not move freely, replace the check valve (19).
5-11
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