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Start Up and Adjust Pump
14 312376L
4. For L20c Air Controls:
a. Close elevator director valve. The ram will
slowly drop.
b. If necessary, press blowoff push button to pause
elevator descent.
5. Reduce the air motor regulator pressure and open
the air motor valve.
6. Adjust air motor regulator until the pump starts.
7. Cycle the pump slowly until all air is pushed out and
the pump and hoses are fully primed.
8. Release the gun/valve trigger and lock the trigger
safety. The pump should stall against pressure.
9. If the pump fails to prime properly, open the pump
bleed valve (P) slightly. Use the bleed hole, on the
underside of the valve, as a priming valve until the
fluid appears at the hole. Close the plug.
10. With the pump and lines primed, and with adequate
air pressure and volume supplied, the pump will
start and stop as you open and close the gun/valve.
In a circulating system, the pump will speed up or
slow down on demand, until the air supply is shut
off.
11. Use the air motor regulator (see FIG. 10) to control
the pump speed and the fluid pressure. Always use
the lowest air pressure necessary to get the desired
results. Higher pressures cause premature tip/noz-
zle and pump wear.
FIG. 10: L20c Air Controls
To reduce the risk of fluid injection, do not use your
hand or fingers to cover the bleed hole on the under-
side of the bleed valve body (P) when priming the
pump. Use the handle or a crescent wrench to open
and close the bleed plug. Keep your hands away from
the bleed hole.
Always use lowest possible fluid pressure to bleed
air out of pump.
Air Motor Regulator
Elevator Director
Valve
Air Motor Valve
r_257302_312376_2e
Blowoff Push Button
F
IG. 11
When changing fluid containers with the hose and
gun/valve already primed, open the pump bleed
valve (P), to help prime the pump and vent air
before it enters the hose. Close the valve when all
air is eliminated.
CAUTION
Do not allow the pump to run dry. It will quickly accel-
erate to a high speed, causing damage. If your pump
is running too fast, stop it immediately and check the
fluid supply. If the container is empty and air has been
pumped into the lines, refill the container and prime
the pump and the lines, or flush and leave it filled with
a compatible solvent. Eliminate all air from the fluid
system.
ti10420a
P