Operation/Maintenance
3.Push in on the air valve knob to lower the elevator, so the cover (A) rests on the top lip of the drum. The support clamp (K) recesses must be tight against the elevator riser tube. The pump intake valve feet (B) must contact and support the perfo- rated plate (9) as shown in Fig. 2.
4.Raise the elevator 1/4” (6.4 mm), then tighten the support clamp screws. This ensures that the cover rests on the drum lip when the elevator is in the lowered position.
5.Adjust the restrictor valve screw to control the speed of raising and lowering the unit. Turn the restrictor screw clockwise to decrease the air pressure and counterclockwise to increase air pressure to the elevator. Lock the screw’s position with the locknut when the adjustment is completed.
6.Unscrew the filter bowl and remove the filter screen. Replace the bowl. Flush the unit until clear solvent comes from the gun, then reinstall the filter screen.
7.Before operation, ensure that all fasteners and tube connections are tightened securely.
Starting and Adjusting the Pump
1.Lower the pump into the fluid supply drum.
2.Close the air regulator (F).
3.Open the pump’s
4.Hold a metal part of the gun (S) firmly to the side of a grounded metal pail and hold the trigger open.
5.Slowly open the regulator until the pump starts.
6.Cycle the pump slowly until all air is pushed out and the pump and hoses are fully primed.
7.Release the gun trigger and lock the trigger safety. The pump should stall against pressure.
8.If the pump fails to prime properly, open the drain valve (M). Use the drain valve as a priming valve until the fluid flows from the valve. Close the valve.
NOTE: When changing fluid containers with the hose and gun already primed, open the drain valve (M) to help prime the pump and vent air before it enters the hose. Close the drain valve when all air is eliminated.
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 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.
9.With the pump and lines primed, and with ade- quate air pressure and volume supplied, the pump will start and stop as you open and close the gun. In a circulating system, the pump will speed up or slow down on demand, until the air supply is shut off.
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 Technical Data on
page 13.)
10.Use the air regulator (F) to control pump speed and fluid pressure. Always use the lowest air pressure necessary to get the desired results. Higher pressures cause premature tip and pump wear.
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 8.
For overnight shutdown, stop the pump at the bottom of its stroke to prevent fluid from drying on the ex- posed displacement rod and damaging the throat packings. Relieve the pressure.
Always flush the pump before the fluid dries on the displacement rod. See Flushing on page 8.
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