d. Position respirator on face, fitting wide por-
tion under chin, and narrow portion over nose, wear-
ing as low as possible. Place upper band above ears
to top of head, lower band below ears to back of
neck, and adjust for tight seal.
e. Test for proper seal by removing exhalation
valve guard, remove exhalation valve guard close
exhalation valve with your thumb and exhale gen-
tly. If leakage is detected readjust head bands until
tight seal of facepiece is obtained.
f. Replace exhalation valve guard.
Start the unit as follows (Fig. 2-2):
a. Screw the manual unloading knob counter-
clockwise (Fig. 2-6).
The unloader pilot valve acts to pre-
vent the air pulsation chamber from
exceeding 80 psi or falling below 65
psi under normal operating condi-
tion. When the manual unloading
knob is turned counterclockwise the
unloader pilot valve directs air to
compressor unloaders which prevents
the compressor from pumping air into
the pulsation chamber. Thus, the com-
pressor is unloaded and allows you to
start the engine with less effort.
b. Open valve on fuel filter. (Refer to TM 5-2805-
257-14 operating procedures).
c. Set ignition switch to RUN.
d. Place throttle control approximately 1/4 inch
(0.6 cm) forward of idle position.
e. Set choke on carburetor to closed. Less
choking may be necessary due to variations in tem-
perature, grade of gasoline or altitude. Generally,
choking is not required when engine is warm.
f. Wind rope around pulley and give a quick
steady pull. Keep starter rope in a straight line with
pulley. If a second pull is necessary, move choke
back to middle position.
g. Return choke to open position after engine has
run for a few minutes, move throttle to full gov-
h. Screw the manual unloader knob clockwise.
This will allow compressor to pump air into the pul-
sation chamber (Fig. 2-6).
Operate the manual unloading knob
with your fingers only. Do not use
wrenches, pliers, or other tools as
they may damage or misadjust the un-
loader pilot valve.
i. Check pulsation chamber pressure gage, pres-
sure will rise slowly until a reading of 80 psi is
reached (Fig. 2-2).
While spraying, the normal gage read-
ing will vary between 65 psi and 80
2-6. Emergency Stopping.
Move engine ignition switch to OFF.
2-7. Operation of Paint Spray Outfit.
To operate the Paint Spray Outfit, proceed as fol-
a. Open air valves on pulsation chamber. This
will allow air to fill red air hoses to pressure (paint)
tank (Fig. 2-2).
b. Close the slide valve by pushing towards fluid
pressure air gage (Fig. 2-3) and allow pressure to
build up in pressure (paint) tank while adjusting
fluid pressure air regulator until fluid pressure air
gage indicates 10 psi (Fig. 2-3).
If you read higher than 10 psi on the
fluid pressure air gage, open the slide
valve to release tank pressure. Un-
screw handle on fluid pressure air reg-
ulator two turns. Close the slide valve
and try to adjust the fluid pressure
air regulator again.
c. Remove air nozzle by unscrewing lock ring
d. Place waste material container beneath spray
gun and test flow of fluid by pulling trigger all the
way back. When material flows steadily, release
This step is necessary to fill black
fluid hose and spray gun with paint
and remove trapped air.
Replace air nozzle.