Erratic or accelerated pump speed.

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

Fluid supply is exhausted

Refill the fluid supply and prime the pump.

Clogged suction

Clean the suction tube.

Open or worn piston valve packings

Clear the piston valve.
Replace the packings.

Open or worn intake valve

Clear or service the intake valve.

Clogged gun, hose, outlet, etc

Clear the gun, hose, outlet, etc.

Open or worn outlet check valve

Clear or service the outlet check valve.