5-19.1 CENTRIFUGAL PUMP (ELECTRIC MOTOR DRIVEN)
Disconnect intervehicle power cable from vehicle and close
tank dispensing valve before maintaining or replacing electrical
components otherwise, electrical sparks could occur, creating
a fire hazard.
The pump is a centrifugal-type unit that is directly coupled to the motor. The pump case houses the impeller, wear
plate, seal, and adapter shaft, and serves as a liquid chamber with suction and dispensing ports. The check valve
assembly consists of a large weight, gasket, and a small weight to prevent fluid backflow through the pump case
and thereby retain the prime. Repair of the pump consists primarily of replacing damaged or worn components.
a. Removal. Remove the Electric Motor Driven Pumping Assembly (para. 4-24.1).
b. Disassembly. (Figure 5-10.1)
(1) Remove pump drain plug (1) and drain into suitable container.
(2) Remove nuts (2) and washers (3) and remove volute (4) and O-Ring (5).
(3) Remove center screw (6) and seal (7).
(4) Remove impeller (8) by unscrewing counterclockwise while holding shaft stationary. Hold armature shaft
stationary with screwdriver in slot.
Remove shims (9), screws (10) and wear plate(11).
Remove O-Ring packing (12) and seal assembly (13).
Extract four screws (14) and compression inserts (15), remove pump from motor.
Remove adapter shaft (16) and Woodruff key (17) from engine shaft (18).
Remove nuts (26), suction flange (25), screw (24), small weight (23), gasket (22), large weight (21) and studs
27) from pump case (19).