Hi and welcome to FixYa, I am Kelly.
Not sure if anyone has responded to you but.... This is a symptom of the unloader
/ bypass valve sticking. The unloader
bypass valve is located on the output side of the pump either under a brass cap or an extended stem with a knob on it for pressure adjustment.
- Lay the unit down so that the water supply connection fitting is facing up. Leave the high pressure hose connected with wand. (Power to the unit)
- First inspect the inlet screen for debris.
- Next pour about 3 oz of regular automotive engine oil in the water supply fitting. Take your time... do momentary on / off cycles of the switch (bump the pump.... on / off) You are trying to get oil to the outlet fitting (No more than 1 second on off cycles)
- Check for evidence of oil at outlet fitting
- Leave it set overnight with oil in the unit. (Water supply and outlet fittings up.)
NEXT DAY.... add 2 oz more oil and connect water supply. (PURGE HOSE of ALL air before connecting)
This procedure does not always work
- Do not pull wand trigger yet
- Cycle unit on and off about 10 times slowly... don't ruin the switch then let sit 10 mins.
- Turn unit on without triggering and let run for about 2 minutes.
- NEXT STEP be advised your going to shoot out OIL
- Begin triggering the wand on 1 sec off 3 seconds for at least 2 minutes (your trying to get the unloader bypass spring / plunger and seals to start moving inside the pump high pressure area.)
- If your wand has a soap application function make sure the wand is in the HIGH PRESSURE position. (Closed CCW)
but, I have revived about 70 % of the pressure washers I worked on by just doing these steps. If the procedure does not work... you will have to disassemble the unloader
/ bypass valve by pulling it out of the housing and then cleaning up the inside of the pump housing and wiping the seals
clean. IMPORTANT STEP here: Before inserting the valve back into the pump housing you MUST lubricate it with #105 white grease. Housing and unloader
/ bypass valve parts. (white grease in small tubes at any automotive parts source.
Thanks for choosing FixYa,