Section III. GENERAL MAINTENANCE - TM-5-4320-259-340012

Table

2-1.

Troubleshooting--Continued

Malfunction

Probable Cause

Corrective Action

f. Piston slap.

f. Replace worn pistons (para 4-8

4. Engine makes excessive noise--Cont.

through 4-10).

a. Impeller

broken,

worn,

5. Pump runs with no fluid

a. R e p l a c e i m p e l l e r ( p a r a 3 - 2

damaged.

discharger or with low discharge.

through 3-4).

b. Add or remove shims as required

b. Impeller-to-wear plate clearance

(para 3-2 through 3-4). -

incorrect.

c. Replace volute (para 3-2 through

c. Volute excessively worn.

3-4).

d. Shaft seal defective.

d. Replace

shaft

seal

(para

3-2

through 3-4).

a. Impeller loose.

a. T i g h t e n i m p e l l e r ( p a r a 3 - 2

6. Pump noisy

through 3-4).

b. D i s a s s e m b l e p u m p ; r e m o v e

b. Foreign matter in pump.

foreign matter (para 3-2 through

3-4).

GENERAL

MAINTENANCE

Section Ill.

d. Protect disassembled parts from blowing sand

2-5. General

and dust which could later cause rapid wear of the

This section contains general maintenance

gears, bearings, and machined surfaces.

procedures which are the responsibility of direct

support and general support maintenance per-

2-7. Care of Bearings

sonnel. The paragraphs contained here in describe

a. Clean all bearings by placing them in a wire

general practices applicable to several assemblies or

basket and immersing them into a container of

components of the pumping assembly which would

fresh cleaning solvent. Agitate the bearings in the

otherwise have to be repeated in each section of the

solvent to remove all traces of old lubricant.

manual assigned to those assemblies and com-

b. After the bearings are cleaned, dry them with

ponents.

clean, filtered compressed air. Take care to prevent

spinning the bearings with the compressed air jet.

2-6. Cleanliness

c. Dip the cleaned bearings in clean engine oil

a. Take care to assure that the work place is

and immediately wrap them in lint-free paper to

clean before starting to disassemble the engine or

prevent the entry of dust and dirt.

pump parts.

2-8. Seals and Gaskets

b. Steam-clean the exterior of the engine or

pump before starting disassembly to prevent the

Replace seals and gaskets of all components with

dirt from entering the bearings. Clean the exterior

each disassembly. The use of new gaskets and seals

of engine components with a cloth dampened with

will greatly reduce the possibility of leaking and

solvent.

will help prevent the entry of dust and dirt after

c. If compressed air is used to clean the parts,

reassembly.

make sure the compressed air is free from dirt and

contaminants.

Section IV. REMOVAL AND INSTALLATION OF MAJOR

C O M P O N E N T S AND AUXILIARIES

2-9. General

b. Removal of the pump from the engine

a. The pumping assembly is mounted on a frame

requires complete pump disassembly, since the

constructed of angular and tubular steel. The pump

pump impeller is screwed directly on the end of the

and engine assembly are mounted on a fabricated

crankshaft of the engine. The pump has n o

base which has handles for easy handling of the

bearings since the crankshaft rides in the engine

engine and pump assembly. An engine mounting

bearings. A seal is installed in the plate that adapts

plate on the pump and engine mounting base

the pump to the engine. This seal prevents leaking

adapts the engine for easy mounting.

around the rotating shaft.

2-2