10 308017
Operation
Flush the Pump Before First Use
The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent. See Flushing on page 11.
Starting and Adjusting the Pump
WARNING
MOVING PARTS HAZARD
See Fig. 3. The priming piston (25) and
the air motor piston (located behind the
air motor plates, AA) move during opera-
tion.
Keep hands and fingers away from the priming
piston (25) during operation and whenever the
pump is charged with air. The priming piston ex-
tends beyond the intake cylinder (23) to pull materi-
al into the pump and can amputate a hand or finger
caught between it and the intake cylinder. Follow
the Pressure Relief Procedure on page 9,
before checking, clearing, or cleaning the priming
piston.
Never operate the pump with the air motor plates
(AA) removed.
1. Do not install the spray tip yet.
2. Supply fluid to the pump, per the requirements of
your system.
3. See Fig. 1. Close the pump air regulator (H).
4. Open the red-handled main air bleed valve (V) and
the pump’s bleed-type air valve (G).
5. Hold a metal part of the gun/valve (N) firmly to the
side of a grounded metal pail and hold the trigger
open.
6. Slowly open the air regulator (H) 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.
WARNING
SKIN INJECTION HAZARD
To reduce the risk of fluid injection, do not use
your hand or fingers to cover the bleed hole on the
underside of the bleeder valve body (43) when
priming the pump. Use a crescent wrench to open
and close the bleeder plug (35). Keep your hands
away from the bleed hole.
9. If the pump fails to prime properly, open the
bleeder valve plug (35) slightly. Use the bleed hole
on the underside of the valve body (43) as a
priming valve until the fluid appears at the hole.
See Fig. 3. Close the plug (35).
NOTE: When changing fluid containers with the hose
and gun/valve already primed, open the bleeder valve
plug (35) to help prime the pump and vent air before it
enters the hose. Close the plug when all air is elimi-
nated.
CAUTION
Do not allow the pump to run dry. It will quickly
accelerate 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 con-
tainer and prime the pump and the lines, or flush and
leave it filled with a compatible solvent. Eliminate all
air from the fluid system.
