PWR55 PRO USER 2,200 Psi Pressure Washer Pump Face PW5522PF - NEW
Pump face for Munro PW55 pressure washer HPPW552200.
These pump faces crack for 3 reasons.
1. The pump if left running for more than two minutes without the lance being used heats the water inside the pump to boiling point. If the lance is then released the hot water that was in the pump chamber leaves through the lance and replaced by cold water. This cold water cools the pump body to quickly and causes the aluminium pump to contract to quickly against the brass Allen bolts and can cause this cracking.
2. Pressure relief valve faulty. Either the top seal on the pressure has come out of it groove causing the valve to stuck and not working. This excess pressure can also crack the pump body. (The seal can come away from its groove when the engine is over revved).
3. A pressure relief valve fault due to over revving of the engine. The valve can be twisted and not in true straight line causing it to stick and not operate.
If changing the pump face it is also recommended to change the pressure relief valve at the same time.
RRP - £69.99
