put gun head screw (29) thru gun handle (36) and
screw gun head (31) down tight.
d. Place gasket (28) into gun head (31). Screw
fluid nozzle (27) into gun head (31) and tighten.
Screw air nozzle assembly (28) onto gun head (31).
e. Assemble fluid control assembly (20) by in-
serting packing (23) into fan control body (22),
turning fan control screw (24) two or three turns
into fan control body (22), sliding three parts to-
gether (22,23 & 24) over fan rod assembly (25) and
screwing fan control needle (21) onto end of fan rod
assembly (25).
f. Insert fan control assembly (20) into gun han-
dle (36) and tighten in place with fan control body
(22).
g. Assemble air valve assembly (12) by placing
packing (14) into air valve body (15), screw packing
nut (13) into air valve body (15), slide air valve stem
(16) thru air valve body (15), packing (14) and pack-
ing nut (13), slide air valve (17) over end of air
valve stem (16), slide gasket (19) over air valve
body (15), and place end of air valve spring (18) over
air valve (17).
TM 5-4940-228-14
h. Insert air valve assembly (12) into gun handle
(36) and screw in place with air valve body (15).
i. Position trigger assembly (11) over handle
(36), insert trigger stud (10) thru trigger assembly
(11) and gun handle (36) and screw in place with
trigger screw (9).
j. Place fluid control gasket (8) over end of fluid
control housing (7) and screw fluid control housing
(7) into gun handle (36).
k. Insert needle assembly (3) into fluid control
housing (7), place fluid control spring (2) over end
of needle assembly (3) and screw in place with fluid
control screw (1).
l. Tighten packing nuts one quarter of a turn at
a time. Actuate trigger after each adjustment. As
soon as a binding or stiffness is felt, loosen packing
nuts 1/8 turn. Adjustment is complete.
m. Connect spray gun to the Paint Spray Outfit
as described in Chapter 2. You can use water or
paint thinner instead of paint for testing. Point
spray gun into waste container while you spray.
Check for an even spray pattern and look carefully
for any leaks.
Section IX. MAINTENANCE OF PRESSURE TANKS
4-18. General
The pressure tanks are five gallon, dual regu-
lated type, with air motor agitators. They are
equipped with separate air and fluid regulators,
gages and valves. The pressure tanks assure con-
stant and uniform flow of fluid to the spray gun by
automatically maintaining regulated air pressure.
An air motor agitator provides means by which the
fluid can be mixed inside each pressure tank, speed
of mixing is controlled by a needle valve.
4-19. Operational Checkout.
Use Figure 4-2 as a guide and proceed as follows:
WARNING
Before attempting any repairs, re-
move all air pressure from the tank.
An attempt to remove parts while
tank is pressurized could cause those
parts to be blown free and inflict in-
jury.
a. Visually inspect all parts of the pressure tank
for damage, cracks or breaks. Replace damaged
parts before proceeding. Check operation of all six
clamps and screws (Refer to para 4-6).
b. Loosen six clamp screws (55) and remove con-
trol head assembly (1) from tank (52). Inspect gas-
ket (49) carefully, replace if any signs of damage
are observed.
c. Remove insert pail (51) from tank (52) since it
will not be needed while servicing.
d. Place control head assembly (1) on tank (52)
and clamp with six clamp screws (55) (hand tighten,
do not use wrenches).
e. Prepare the pressure tank for operational
check out as follows:
(1) Finger tighten needle valve (14) on air
motor (15).
(2) Unscrew (counterclockwise) both air regu-
lator handles all the way out, then screw in five
turns.
(3) Close both shut off cocks (23 and 24).
(4) Push slide valve (35) towards fluid pres-
sure air regulator (33).
(5) Apply air pressure of 60 to 80 psi to the air
inlet connection (7).
4-5
