Section XIV. MAINTENANCE OF PUMP - TM-5-4320-234-120082

b. Cleaning and Inspection.

movement, illegible dial faces, evidence of water entry,

and other damage. If possible, check the operation

WARNING

against master gages to ensure the accuracy of the

Clean all parts in a well-ventilated

indication. Replace damaged gages.

area. Avoid inhalation of solvent

(4) Inspect the lines for cuts, abrasions, leaks,

damaged threads, and other damage. Blow through

fumes and prolonged exposure of

lines with compressed air to ensure that they are open.

skin to cleaning solvent.

Wash

Replace damaged lines.

exposed skin thoroughly.

Dry

(5) Inspect the valves for cracks, damaged

cleaning solvent (fed. spec. P-D-680)

threads, and for catching or binding of the valve stem.

used to clean parts is potentially

Replace damaged valves.

dangerous

personnel

and

(6) Inspect all other parts for cracks, distortion,

property. Do not use near open

damaged threads, and other damage; replace damaged

flame or excessive heat. Flash point

parts.

of solvent is 100 to 138F (38 to

c. Reassembly and Installation. Install the suction

59C).

and discharge gages, lines, and fittings as shown in

(1) Clean the suction and discharge gages with

figure 4-30. After assembly, start the pump and check

a cloth dampened with dry cleaning solvent (fed. spec.

for leaks. Correct any leaks noted.

P-D-680); dry thoroughly.

(2) Clean all lines and fittings by washing in

cleaning solvent. Shake off excessive solvent.

(3) Inspect the suction and pressure gages for

cracked dial glass, binding or sticking needle

Section XIV. MAINTENANCE OF PUMP

4-48. Description

priming only at initial startup or after the pump has lost

a. The centrifugal pump has a discharge elbow

its priming fluid through evaporation or draining.

Otherwise, it will self-prime using the fluid which is

secured to the top of the pump housing with studs and

retained in the pump body.

nuts. The straight suction inlet is in the front center of

c. Both suction and discharge ports have screw-in

the pump housing. Both suction and discharge ports are

caps which protect the pump from the entry of foreign

provided with threaded flanges having 6-inch female

matter when the suction and/or discharge lines are

NPT threads. The suction inlet incorporates a flapper-

disconnected.

type check valve which prevents reverse flow of fluid

through the pump when the unit is shut down. The

4-49. Suction and Discharge Assemblies

check valve also helps retain fluid in the pump housing

a. Removal.

to facilitate the self-priming action.

b. This self-priming pump requires manual

(1) Remove the two primer plugs (1, fig. 4-31)

and the drain plug (2) from the pump casting.

4-52