TM 5-4940-228-14
Key to Figure 4-2:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
Control head assembly
Fluid post
Propeller screw
Propeller
Pressure hose assembly
Coupling
Fitting (3)
Muffler
Cup
Screen (2)
Felt (2)
Base
Nipple
Needle valve
Air motor
Housing
Nut
Packing washer
Packing
Propeller shaft
Adapter
Fluid strainer
Shut off cock
Shut off cock
Pressure gage (2)
Air filter
Nipple
Tee
NOTE
If air supply is not available to you,
connect pressure tank to compressor
assembly. Follow operation pro-
cedures of Chapter 2 but, do not con-
nect spray guns or use any paint.
(6) Listen carefully for any air leakage. Obvi-
ous air leaks must be repaired before proceeding
(Fig. 4-2).
WARNING
Before attempting any repairs, re-
move all air pressure from the tank.
An attempt to remove parts while the
tank is pressurized could cause those
parts to be blown free and inflict in-
jury.
(7) Look at both pressure gages. Both gages
should indicate zero pressure. If not, the air regu-
lator next to that pressure gage is damaged and re-
quires replacement (Fig. 4-2). Pressure gage can be
removed directly from pressure tank if defective.
(8) Slowly open needle valve (14) ; watch cou-
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
Nipple
Union
Nipple
Street elbow
Regulator
Nipple
Slide valve
Tee
Nipple
Nipple
Tee
Nipple
Street elbow
Regulator
Nipple
Cross
Nipple
Elbow
Nipple
Safety valve
Gasket
Tank head
Insert pail
Tank
Clamp (6)
Pin (6)
Clamp screw (6)
pling (6) thru slots in housing (16). If coupling (6)
does not rotate, or if motor suddenly rotates rapidly,
air motor is damaged and requires replacement
(para 4-26).
(9) Observe pressure gage next to spraying
pressure air regulator (42) while tightening
spraying pressure air regulator (42) adjusting
screw slowly until a 20 psi reading is reached.
Watch pressure gage for two or three minutes. Pres-
sure should not change more than 2 psi, if it does,
spraying pressure air regulator (42) is defective and
must be replaced (para 4-20).
(10) Move slide valve towards fluid pressure
gage. Observe fluid regulator handle, adjust until
10 psi is reached. Open slide valve (push toward reg-
ulator); air should be released from the tank and
pressure gage should read zero. Failure to reach 10
psi or return to zero, indicates a defective slide
valve which requires replacement (Fig. 4-2).
(11) Move slide valve towards fluid pressure
gage. Observe fluid pressure gage while tightening
fluid regulator handle to 40 psi. Watch gage for two
to three minutes, pressure should remain constant.
If 40 psi could not be reached, listen for air leak
4 -7
