CHAPTER 2. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

CHAPTER 2

DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

Section I.

R E P A I R PARTS, SPECIAL TOOLS, AND EQUIPMENT

2-1. Special Tools and. Equipment

illustrated in the repair parts and special tools list

No special tools and equipment are required for the

covering d i r e c t support and general support

direct support and general support maintenance of

maintenance for this pumping assembly. Refer to

the pumping assembly.

T M 5-4320-259-34P

2 - 2 . Maintenance Repair Parts

R e p a i r parts a n d equipment are listed and

TROUBLESHOOTING

Section II.

2-3. General

and organizational

s c o p e of operator/crew

maintenance, refer to TM 5-4320-259-12.

This section describes troubles which might occur

during operation of the pumping assembly, along

2-4. Direct Support and General Support

with the probable causes and corrective actions re-

M a i n t e n a n c e Troubleshooting

lating to the troubles. Only those functions which

Refer to table 2-1 for troubleshooting which is

are solely within the scope of direct and general

allocated to direct support and general support

support

maintenance

listed.

are

For

maintenance levels.

troubleshooting procedures which are within the

Table 2-1. Troubleshooting

Corrective Action

Probable Cause

Malfunction

a. Disassemble pump and free

1. Engine

will not turn over.

a. Impeller binding in volute.

impeller (para 3-2).

b. Remove pump from engine (para

b. Engine seized.

3-2). Repair engine as necessary

(para 4-4 through 4-22).

Test engine to determine fault (TM

2. Engine

cranks but will not start.

Engine compression too low.

5-4320-259-12). Repair engine

as necessary (para 4-4 through 4-

22).

a. Free stuck valves. Replace or

a. One or both valves stuck open.

3. Engine lacks power, s m o k e s , or

regrind if burned (para 4-4

operates erratically.

through 4-6).

b. Replace valve springs (para 4-4

b. Valve springs weak.

through 4-6).

c. Replace defective piston (para 4-8

c. Defective piston.

through 4-10).

d. Replace piston rings (para 4-8

d. Piston rings worn.

through 4-10).

e. Correct engine timing (Para 4-14).

e. Crankshaft not timed to camshaft.

a. Main or connecting rod bearing

a. Replace defective bearing (para 4-

4. Engine makes excessive noise.

8 through 4-10 or 4-12 through 4-

defective.

14).

b. Aline blower housing (TM 5 -

o n blower

b. Flywheel rubbing

4320-259-12).

housing.

c. Replace pistons (para 4-8 through

C. Loose piston pins.

4-l0).

d. Excessive crankshaft end play.

d. Replace main bearings (para 4-12

through 4-14).

e. Loose camshaft bearings.

e. Replace camshaft or pin (para 4-

16 through 4-18).

2-1