CHAPTER 5. REPAIR OF CENTRIFUGAL PUMP ASSEMBLY

TM 5-4320-234-34

CHAPTER 5

REPAIR OF CENTRIFUGAL PUMP ASSEMBLY

5-1. Description

c. Repair consists primarily of replacing the shaft

a. The centrifugal pump assembly consists of the

seal and other damaged parts. Overhaul consists of

pump, bearing housing, and flexible coupling. The

complete teardown to allow inspection and, if necessary,

centrifugal pump is driven by the engine through a

replacement of all operating parts, including bearings,

coupling which is secured to the impeller shaft. The

impeller, and wear plate. Repair can be done without

impeller shaft is ball bearing mounted in the bearing

removal of the entire pump assembly from the engine

housing. The impeller shaft extends into the pump

and chassis. Overhaul requires removal of the unit to a

housing which is bolted to the bearing housing. The

workbench.

open-type impeller is keyed to this end of the shaft so

that it rotates with the shaft.

5-2. Shaft Seal Replacement

b. The impeller is enclosed in a close-fitting volute

Replace a leaking shaft seal as follows:

to provide efficient operation. The pump housing

a. Remove the drain plug (1, fig. 5-1), and drain all

provides the suction and discharge ports. The pump

fluid from the pump body.

housing has a replaceable wear plate. This wear plate

is subjected to most of the internal pump wear.

5-1