Once connected to water supply and the power is switched on, it makes a loud pulsing sound. As soon as I pull the trigger on the lance the noise stops and seems to workOK, until I release the trigger and the noise returns.
Sounds like your unit has a bypass problem either needs adjustment or replaced
If your pressure hose or gun has a small leak in it is is common for the unit to keep kicing back into pressure mode....as the pressure in the line drops due to the leak. the unit will try to compensate by returning to the pressure mode. Fix the leak and the pulsing will stop. These leaks are usually caused by carcked or broken o-rings at the connection. These connectors seal on the inside diameter and sealing the outside threads will not eaily solve a leak.
SOURCE: honda pressure washer cuts out when lance trigger released.
You most likely need to set your valve clearances. If it is hard to
pull over or the recoil snaps back after starting your valves need to
be set for sure. This may not be the entire problem but it is a good
start. Also change the spark plug, a bad plug will cause odd problems
and is too cheap not to eliminate as a source. In addition check your
fuel, pour a little out into a white container (I like spray paint can
caps for this) and look at the color. If it is yellow to orange it is
bad. You can pour it into you car, the car electronic sensors will
compinsate for it quality but a small engine can't. Use a NGK BP6ES or
BPR6ES plug.
You need:
Feeler gages
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet
Remove
the spark plug and the valve cover. Pull the recoil over slowly until
the intake valve opens (intake is closes to the carb and it will go
down when it opens). Now put your long screwdrive down the spark plug
hole. Slow pull the engine over until the screwdriver handle is at it
highest point, this is top dead center. It may take a few attempts. Now
check your valve clearance between the rockers and the top of the
valve. The intake should be .006 and the exhaust .008, both can be +/-
.001. To adjust: hold the large nut with the 14mm then loosen the small
one with the 10mm. Lefty loosey. Now turn your large nut until you get
the correct setting and then tighten the small one the lock it in. It
may take a few attempts and alway reverify your setting after you lock
it down. Once done, find top dead center again and reverify. Now your
valves are set.
SOURCE: Loud repeating noise until the water trigger is pressed
Check the pressure washer for leaks. That sound is probably the unloader valve recycling as the machine slowly looses pressure and needs to build it up again to max pressure.
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Thanks for replying, is it easy to confirm the problem once I open up the unit?
yes if that unit has a pressure gauge on it adjust it slowly then let go of the trigger for just a second if it rises more than 200 -400 psi it is defective and need to be replaced. another way to test it is to remove the unloader plumb your pressure washer hose where that unloader was DO NOT!!! RELEASE THE TRIGGER. turn it on if it runs like a dream replace the unloader
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