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13
Operation/Maintenance
(AIR-POWERED PUMPS)
Starting and Adjusting the Pump
1.
Refer to Fig. 3 on page 8. Connect the suction kit
(T) to the pump’s fluid inlet, and place the tube into
the fluid supply.
2.
Be sure the air regulator (F) is closed. Then open
the pump’s bleed-type master air valve (E). Hold a
metal part of the spray gun/dispensing valve (S)
firmly to the side of a grounded metal pail and hold
the trigger open. Now slowly open the air regulator
until the pump starts.
3.
Cycle the pump slowly until all air is pushed out
and the pump and hoses are fully primed. Release
the gun/valve trigger and lock the trigger safety
latch. The pump should stall against pressure
when the trigger is released.
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 (34) when
priming the pump. Use a crescent wrench to open
and close the bleeder plug (35). Keep your hands
away from the bleed hole.
4.
If the pump fails to prime properly, open the
bleeder valve (35) slightly. Use the bleed hole on
the underside of the valve body (34) as a priming
valve until the fluid appears at the hole. See Fig. 5.
Close the plug (35).
NOTE: When changing fluid containers with the hose
and gun already primed, open the bleeder valve plug
(35), to assist in priming the pump and venting air
before it enters the hose. Close the bleeder valve
when all air has been eliminated.
5.
With the pump and lines primed, and with ade-
quate air pressure and volume supplied, the pump
will start and stop as the gun/valve is opened and
closed. In a circulating system, the pump will
speed up or slow down on demand, until the air
supply is shut off.
6.
Use the air regulator 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/nozzle and
pump wear.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury, never
exceed the specified Maximum Incoming Air Pres-
sure to the pump (see the Technical Data on
pages 32–35).
7.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a
high speed, possibly damaging itself. A pump
runaway valve (C), which shuts off the air supply to
the pump if the pump accelerates beyond the
pre-set speed, is available. See Fig. 3 on page 8.
If your pump accelerates quickly, or is running too
fast, stop it immediately and check the fluid supply.
If the supply container is empty and air has been
pumped into the lines, refill the container and
prime the pump and the lines with fluid, or flush
and leave it filled with a compatible solvent. Be
sure to eliminate all air from the fluid system.
Shutdown and Care of the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
For overnight shutdown, relieve the pressure. Stop
the pump at the bottom of its stroke to prevent fluid
from drying on the exposed displacement rod and
damaging the throat packings.
Always flush the pump before the fluid dries on the
displacement rod. Never leave water or water-based
fluid in the pump overnight. First, flush with water or a
compatible solvent, then with mineral spirits. Relieve
the pressure, but leave the mineral spirits in the pump
to protect the parts from corrosion.
