a. Check if water pump is working normally
b. Check water supply to see if enough pressure
c. Check if need to replace orifice or water jet not focused
Check end bell to see if there is leak of oil or water. If leak water, It is time to
replace the HP seal. If leak oil, need to change the LP seal.
e. Check if inlet check valve working properly. If not working, water
will return to the low pressure side.
f. Check if outlet check valve is working properly, touch with
hand to see if it is hot .
Check HP plunger. Remove inlet/outlet check valve, Turn on the oil pump,
observe if the plunger is shifting normally.