Pump Dammage Causes
What causes Pump Dammage ?
1) Cavitation. The pump will starve of water and the air in the system will make tiny explosions in the head and will dammage packings, valves and, plungers. Check your filters regularly if you have them.
2) The unloader is set too high. The unloader will spike if set too high. The pressure should be only about 400 psi higher on the spike. When the unloader is set too high it will cause the same dammage as Cavitation.
3) No inlet screen. If you don't have some kind of filter on the input side of the pump trash can get in the pump and do dammage. Sand is the most common thing to find inside of a broken pump.
4) Running the water from the bypass back into the inlet of the pump. The longer you run your machine with out pulling the trigger the hotter the water becomes. This is caused by friction. The Molecules moving in a constant circle builds up heat and will dammage your pump. If you have a tank available Run your bypass into the tank. Also as a general rule If you don't pull the trigger for 3 min or more Shut the machine down to save your pump.