Section III. WATER PUMP ASSEMBLY

Section III. WATER PUMP ASSEMBLY

48. General

50. Pump Gearbox, Cleaning, Inspection, and

Repair

The water pump assembly consists of a main

pump, drive unit and relief valve. The main pump

includes the impeller, main shaft, main bearings and

a. Cleaning.

Clean all parts in an approved

head, suction and discharge pipes, and the volute case.

cleaning solvent and dry thoroughly.

The drive unit contains driving gears and bearings for

the main pump, which is driven by the power takeoff unit

b. Inspection. Inspect all parts for wear, defects,

on the truck transmission. Series of vanes on the

and damage.

rapidly rotating impeller produce centrifugal force which

forces the water through the inside of the impeller, this

c. Repair. Replace or repair worn, defective, or

increases the pressure of the water and creates a

damaged parts as necessary.

vacuum which draws more water into the impeller. The

relief valve bypasses water within the pump to prevent

51. Pump Gearbox, Reassembly and Installation

pressure rise when the hose lines are shut off.

49. Pump Gearbox, Removal and Disassembly

a. Reassembly. Refer to figure 12 and reassemble

the pump gearbox in the reverse order.

a. Removal. Refer to figure 11 and remove the

pump gearbox from the pump assembly.

b. Installation. Refer to figure 11 and install the

pump gearbox on the pump assembly.

b. Disassembly.

Refer

and

disassemble the pump gearbox.

Figure 11. Pump gearbox, removal and installation.

TAGO 5947-A