OIL PUMP, SIGHT INDICATOR AND RESERVOIR

compressed air. Be sure all drilled passages are clean

b. Slowly increase air pressure applied to strainer

and unobstructed. Inspect parts for scoring, scratches,

and relief valve assembly until valve opens, allowing air to

corrosion, wear and other signs of damage. Refer to

escape to atmosphere through holes drilled in adjusting

Table 5 for allowable wear. Discard all damaged, worn or

plug.

questionable parts, and install new items during

c. Place a collector cup over seat housing end of

reassembly.

assembly. Connect a 1/4-inch inner diameter hose to

4.14.7.3

REASSEMBLY. Reassemble the oil pump,

collector cup and immerse opposite end of hose about one

sight indicator and oil reservoir by performing the removal

inch in a container of water.

procedure in reverse sequence. Be sure all gaskets are in

d. Shut off air pressure applied to strainer and relief

good condition and properly installed, and that all screws

valve assembly. As applied pressure decreases, observe

and nuts are tightened sufficiently to eliminate oil leaks.

pressure gage and note pressure at which valve closes

Install safety wire as in the original equipment

(i.e., leakage rate as indicated by escaping air bubbles is

configuration.

one bubble per second or less).

4.14.8

INSTALLING

AIR

COMPRESSOR

(See

e. Second stage strainer and relief valve should

Figure 5-11.

close before applied pressure drops below 100 PSIG.

a. Align air compressor (3) with shaft of gasoline

Third stage strainer and valve should close before applied

engine (20) and carefully mate units. Engage draw bolt

pressure drops below 700 PSIG.

(11, Figure 5-12) with tapped hole in engine crankshaft but

f. If necessary, readjust sprig adjusting plug to

do not tighten. Install cap screws (4) and lock washers (5)

obtain required operation of strainer and relief valve

attaching compressor to engine, but do not tighten.

assembly. Turn plug clockwise to increase pressure,

b. Slip spacers (6) between mating surfaces of

counterclockwise to lower closing pressure.

compressor and engine. Tighten cap screws (4) as

g. Repeat alternate tests and adjustments until

necessary to hold spacers in place. Tighten draw bolt with

strainer and relief valve functions as specified. Safety

a torque of 125 to 150 pound-inches, then loosen cap

wire adjusting plug to seat housing with 0.025 inch

screws and remove spacers. Retighten cap screws.

diameter stainless steel wire.

c. Attach nameplate (4, Figure 5-12) to compressor

4.14.6.6 INSTALLATION. Refer to paragraph 4.14.4.3,

fan guard with screws and lock washers (5 and 6, Figure

step f.

5-12).

4.14.7 OIL

PUMP,

SIGHT

INDICATOR

AND

d. Reconnect aftercooler-to-separator connecting

RESERVOIR

tube (22, Figure 5-3) to union installed in compressor

aftercooler.

4.1.7.1 REMOVAL (See Figure 5-12).

e. Reconnect first-stage-to-filter connecting tube (17,

a. Make certain all lubricating oil is drained from

Figure 5-3) to the installed in compressor first stage

crankcase. Remove drain cock and elbows (1 and 2,

cylinder head.

Figure 5-11) from drain hole in oil reservoir.

f. Replace housing on compressor end of cart (refer

b. Remove eight screws and lift sight glass cup (35),

to paragraph 4.17).

gaskets (38 and 39) and sight indicator(37)from side of oil

reservoir (46).

4.14.9

COMPRESSOR

PRELIMINARY

LUBRICATION RUN

c. Remove four screws (41) and carefully slip oil

pump housing (40) and gasket (42) from bottom of oil

4.14.9.1

During normal compressor operation, the

reservoir (46).

small quantity of oil vapor that passes from the first stage

d. Remove two screws (44) and pull oil pump

cylinder to the second and third stage cylinders along with

cylinder (43) and packing (45) from oil pump housing (45).

the compressed air provides the necessary piston to

cylinder lubrication. However, following overhaul of the

e. Remove fasteners (47) and pull oil reservoir (46)

air compressor assembly or replacement of any part of the

from compressor crankcase (117). Remove and discard

assembly, the compressor must operate for an

oil reservoir gasket (48).

appreciable time before the lubricant is thoroughly

circulated in this manner. To prevent damage to the

f. Cut safety wire and unscrew oil pump piston

second and third stage cylinder and piston assemblies

retainer (50) from master rod (113). Remove shims (51),

during this initial period of operation, all repaired and/or

oil pump piston (49), ball retainer (53) and master rod

overhauled air compressor assemblies first must be

socket (54).

operated in accordance with the following instructions:

4.14.7.2

CLEANING AND INSPECTION. Clean all

a. Disconnect first-to-second-stage connecting tube

parts by washing In dry -cleaning solvent (Federal

at second stage strainer and relief valve assembly.

Specification PS-661). Dry parts with clean, lint-free

cloths and/or