Operation/Maintenance
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 12.
Starting and Adjusting the Pump
1.See Fig. 2. Connect the suction kit (T) to the pump’s fluid inlet. Place the tube into the fluid supply.
CAUTION
To prevent intake valve damage, always apply PTFE tape to the female threads of the intake valve before connecting a suction hose or fitting to the intake.
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.
FOR MODEL 686615 ONLY
If the pump fails to prime properly, open the bleeder valve plug (113) slightly. Use the bleed hole on the underside of the valve body (112), as a priming valve until the fluid appears at the hole, see parts page 22. Close the plug.
WARNING
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 (112) when priming the pump. Use a crescent wrench to open and close the bleeder plug (113). Keep your hands away from the bleed hole.
NOTE: When changing fluid containers with the hose and gun already primed, open the drain valve (M), or the bleeder valve plug (113) for model 686615 to help prime the pump and vent air before it enters the hose. Close the drain valve or the plug for model 686615 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 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.
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, page 25).
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.