STARTUP
Use this procedure whenever starting the pressure washer to help insure that the unit is ready to operate and starting is done safely.
1. Turn on the water supply.
CAUTION
Never run the unit dry. Costly damage to the pump will result. Always be sure the water supply is completely turned on before operating.
2.Turn on the air supply.
3.Trigger the gun to start.
4. ALWAYS engage the gun’ s trigger safety latch whenever you stop spraying, even for a moment, to reduce the risk of fluid injection or splashing in the
OPERATION
Two factors control the flowrate and spray pressure of Graco
Adjustable Nozzle (800–412 & 800–413)
Insert the chemical filter (attached with the clear tubing to the chemical injector) into the container of chemical. Turn the control ring on the adjustable nozzle clockwise. This causes a drop in pressure that actuates the chemical injector. Closing the adjustable nozzle deactivates the chemical injector and produces high pressure for rinsing. The flow rate of the chemical may be regulated by turning the chemical adjustment knob on the injector. Maximum chemical flow is at a full two turns counterclockwise from the closed (clockwise) position.
WARNING
DO NOT attempt to open or close the adjustable nozzle when the spray gun is in use. BE SURE that the trigger safety latch on the gun is in the “ON” position before adjusting to avoid serious bodily injury or fluid injection.
Changeable Spray Tips (800–295 only)
Insert the chemical filter (attached with the clear tubing to the chemical injector) into the container of chemical. Install the large orifice chemical tip (see Installing and
eyes or on the skin if the gun is bumped or triggered accidentally.
5.ALWAYS observe the following CAUTIONS to avoid costly damage to the pressure washer.
CAUTION
DO NOT run the pump dry , which will quickly damage the pump. Be sure the water supply is fully turned on before starting the pump.
DO NOT operate the pressure washer with the inlet water screen removed. This screen helps keep abrasive sediment out of the pump, which could clog or scratch the pump. Keep this screen clean.
DO NOT pump caustic materials; such materials may corrode the pump components.
Changing Spray Tips). This causes a drop in pressure that actuates the chemical injector. Changing back to a small diameter spray tip deactivates the chemical injector and produces high pressure for rinsing. The flow rate of the chemical may be regulated by turning the chemical adjustment knob on the injector. Maximum chemical flow is at a full two turns counterclockwise from the closed (clockwise) position.
Cleaning
No more than 100 feet (30 m) of spray hose may be used between the chemical injector and the spray gun when the operator is at the same level as the chemical injector. If the operator is over 25 feet above the chemical injector, no more than 50 feet (15 m) may be used.
Check the distance that you will need to hold the spray nozzle from the surface by test spraying on a scrap of similar material. For soft surfaces, such as wood, hold the nozzle about 3 ft (1 m) from the surface and gradually bring it closer, checking to see if the high pressure spray is damaging the surface.
Mist wet the surface with cleaning solution, moving from bottom to top. Let it soak briefly , then use the high pressure rinse to “chisel” off the soil, moving from top to bottom. Keep the nozzle angled to the surface and at a distance determined to be best for the surface. If some soil remains, repeat the procedure, letting the chemical soak a little longer. Stubborn soil can be cleaned off better with a stronger, heated cleaning solution.
Protect surfaces that might be damaged by the cleaning solution or high pressure spray. Rinse the solution before it dries.