Cleaning and Inspection - TM-5-4320-251-140033

g. Inspect the lower diaphragm plate and upper

KEY to fig. 4-4.

diaphragm plate for cracks and distortion. Inspect

14 Plunger nut

1. Plug

the studs on the upper diaphragm plate for

2. Nut

15. Spring

looseness and for damaged threads. Replace

16. Spring washer

3. Lock washer

damaged parts.

1 i. Lubrication fitting

4. U-bolt

h. I n s p e c t t h e p l u n g e r s p r i n g f o r c r a c k s ,

18. Upper diaphragm plate

5. Drawbar

19. Cap screw

6. Nut

distortion, and compression. Free length of the

20. Diaphragm ring

7. Leek washer

spring should be 8 inch. Replace a damaged

21. Protective cap

8. Ribbed bolt

spring.

22. Retaining ring

9. Diaphragm pot

i. Inspect the plunger rod for distortion and

23. Retaining ring

10. Nut

11. Lower diaphragm plate 24. Roller bearing

worn or damaged threads. Replace if damaged.

25. Lubrication fitting

12. Diaphragm

j. I n s p e c t t h e b e a r i n g h o u s i n g f o r c r a c k s ,

26. Bearing housing

13. Plunger rod

distortion, worn or damaged threads, and worn

b e a r i n g seating surfaces. Replace a damaged

c. To remove the bearing housing (26) and

bearing housing.

bearing (24), pry out the protective cap (21) to

k. Check the end of the crankshaft of the pump

provide access to the parts. Remove the retaining

gear case. If the bearing surface is damaged or if

ring (22), and pull the assembled bearing and

the end of the crankshaft is distorted or misalined,

housing from the end of the crankshaft with a

report the condition to direct support maintenance.

bearing puller.

4-20. Reassembly

d. Remove the retaining ring (23) and slip the

a. Reassemble the diaphragm a n d p l u n g e r

bearing (24) from the housing (26).

assembly as shown in figure 4-4.

4-19. Cleaning and Inspection

b. Pack the roller bearing( 24) with grease and

slip it into the bearing housing (26) until it is fully

a. Clean the bearing by placing it in a wire

basket and immersing it into a container of ap-

seated. Be sure to press against the outer race of the

proved cleaning solvent. Agitate it thoroughly. If

bearing only. Secure the bearing with a retaining

necessary to dislodge caked or hardened grease,

ring (23).

strike the flat of the bearing aginst a soft wooden

c. Drive the assembled bearing and housing onto

block. When the bearing is clean, blow it dry with

the end of the crankshaft. Secure by installing the

filtered compressed air. Do not allow bearing to

retaining ring (22).

spin. Dip it in light engine oil and wrap it in lint-

d. After the diaphragm ring (20) is installed on

free paper to protect it from dust and dirt.

the frame, position the upper diaphragm plate (18),

b. Wash the diaphragm with water and wipe

s p r i n g washer (16), plunger spring (15), and

dry.

plunger nut (14) on the plunger rod (13). During

c . Clean all remaining parts with approved

assembly, lubricate the lower end of the plunger rod

cleaning solvent; dry thoroughly.

with grease. Tighten the plunger nut onto the rod so

d. Inspect the bearing for rough, catching, and

that the spring is compressed to a length of 8 +

binding operation, excessive looseness between

1 / 32 inch.

balls and races, scoring, and other damage; replace

e. Turn the assembled plunger and spring into

a damaged bearing.

the threaded bore of the bearing housing (26) on

e. Inspect the diaphragm for wear, cracks,

t h e crankshaft. Tighten the plunger nut (14)

brittleness, deterioration, damage to seating sur-

against the bearing housing to lock the parts. Take

faces, cuts, bruises, and signs of leaking; replace a

care not to disrupt the length adjustment of the

dam aged diaphragm.

spring.

f. Inspect the diaphragm pot and diaphragm

f. Install the diaphragm on the pump as directed

ring for cracks, distortion, and damaged threads.

in paragraph 4-2.

Clean up slightly damaged threads. Replace

g. Refer t o current lubrication o r d e r a n d

damaged parts.

lubricate all lube fittings.

Section VIII. MAINTENANCE OF WHEELS AND AXLE

4 - 2 2 . Disassembly

4-21.

Description

a. Lift the pump assembly and place blocking

The pump wheels are mounted on a one-piece,

under the pump frame so that the pump wheels just

round, bar-stock axle which, in turn, is mounted on

clear the ground.

the pump frame with U-bolts. The wheels have

b. Disassemble the wheels and axle from the

semi-pneumatic tires. Each wheel, tire, and bearing

pump assembly as shown in figure 4-5.

unit is treated only as a complete assembly and

should not be disassembled for maintenance or

repair.

4-11