Section III. GENERAL MAINTENANCE - TM-5-4320-234-340039

TM 5-4320-234-34

Table 2-1. Troubleshooting -- Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

CENTRIFUGAL PUMP CONTINUED

Replace all bearings that are damaged.

(1)

Press bearings (8 and 10, fig. 2-20) onto the Impeller shaft (11). Secure bearings to the shaft with retaining ring (7 and 9).

(2)

Press grease seal (12) into the bearing housing (13) and grease seal (5) Into the bearing cap (4) before installing the shaft

and bearings in the bearing housing.

(3)

Pack the bearings and bearing cap with ML-G-10924 grease; pack the area between the bearings in the bearing housing

three-fourths full of the same grease.

(4)

Press the shaft and assembled bearings into the housing until the bearings are seated. Install the preformed packing (6) and

bearing cap (4). Secure the bearing cap with the capscrews (2) and lockwashers (3), tightening them evenly In increments

until all are secure.

(5)

Install coupling half (13, fig. 2-19) on the drive plate (11); secure with six capscrews (10) and lockwashers 1).

(6)

Install drive plate (12) on the engine flywheel and secure with capscrews (8) and lockwashers (9).

(7)

Install collar to coupling half and secure with retaining ring (5) and lockwire (4).

(8)

Install coupling half (7) and collar (6) on the end of the impeller shaft so that the keyway engages the key on the shaft.

Secure with setscrew (3).

(9)

Install three cushions (2) on each coupling half; secure each with sleeve (1).

(10)

Place a sling around the pump and install pump onhe chassis. Install shims (8. 9, and 10) having die same thickness as

the ones removed. Slide the pump into engagement with the engine so that the coupling halves are properly alined.

(11)

Secure the bearing housing to the flywheel housing with nuts (2) and lockwashers (3). Secure the pump feet to the chassis

frame with capscrews (6), lockwashers (5) and nuts (4).

Section III. GENERAL MAINTENANCE

2-5. General

Protect disassembled parts from blowing

sand 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 personnel.

The

2-7. Care of Bearings

paragraphs contained herein describe general practices

WARNING

you will find applicable to several assemblies or

Clean all parts in a well-ventilated area.

components of the pumping assembly which would

Avoid inhalation of solvent fumes and

otherwise have to be repeated in each section of the

prolonged exposure of skin to cleaning

manual assigned to those assemblies and components.

solvent. Wash exposed skin thoroughly.

WARNING

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

Clean all parts in a well-ventilated area.

used to clean parts is potentially

Avoid inhalation of solvent fumes and

dangerous to personnel and property. Do

prolonged exposure of skin to cleaning

not use near open flame or excessive heat.

solvent. Wash exposed skin thoroughly.

Flash point of solvent is 100 to 138 F (38 to

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

59 C).

used to clean parts is potentially

Clean ball and roller bearings by placing

dangerous to personnel and property. Do

them into a wire basket and then immersing them into a

not use near open flame or excessive heat.

container of fresh cleaning solvent (fed. spec. P-D-

Flash point of solvent is 100 to 138 F (38 to

680). Agitate the bearings in the solvent to remove all

59 C).

traces of old lubricants.

2-6. Cleanliness

After the bearings are cleaned, allow them to

Take care to ensure that your work area is

air dry.

clean before starting to disassemble the engine or pump

Dip the cleaned and dried bearings in clean

parts.

engine oil and immediately wrap them in lint-free paper

Clean the exterior of the engine or pump

to prevent the entry of dust and dirt.

before starting disassembly to prevent dirt from entering

2-8. Seals-and Gaskets

the bearings or the other critical contact surfaces. Clean

the exterior of engine components with a cloth

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

Replace seals and gaskets of all components you

disassemble. The use of new gaskets and seals will

If you clean the parts with compressed air,

greatly reduce the possibility of leaking and will help

make sure the air is free from dirt and contaminants.

prevent the entry of dust and dirt after reassembly.

2-28