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Honda pressure washer model # exhp3640-1 3600psi 0=13hp has low water pressure out of triggers motor does not engage for higher pressure

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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stug_57u
  • 99 Answers

SOURCE: No pressure in the pressure washer

Leaving the hose on shouldn't cause a problem so don't panic. It sounds like you could just have a dirty nozzle. Try sticking a pin or something in the end of the nozzle (machine not running) and giving it a clear out. also if it is a two peice gun, split it and tap the squirting part on something clean like a workbench to clear any debris that might have got in there.

Posted on Nov 01, 2008

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  • 615 Answers

SOURCE: I have a Honda 3500 pressure washer. The motor

You need to start the unit and let it run for few minutes to get worm, make sure the water is fully open and the unit is fully cleaned. Push on the trigger on and off for few times not letting the unit shutdown, then start increasing the fuel mixture ¼ turn and push on the trigger again and see…this could be that the unit need service or the governor springs getting week if you got one on your unit…let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

Posted on Sep 20, 2009

Testimonial: "The problem was the governor spring. Thanks"

  • 1 Answer

SOURCE: pressure washer not working

OK here is the solution. There are six plastic vaules inside the pump if you have any mechanical skills you can fix this.
These plastic valves melt when you leave your pressure washer running for a short period when you are not pressure washing. once this happens the pump becomes cloged and does not function. I spent alot of time and research on finding the parts for replacement. I called the main company of this washer pump and here is the toll free number
800-999-2245 and the web sight www.pressureparts.com but to save time just call and talk to the service tech tell him you model number and he will give you the part number.
I only paid $13.75 plus shipping around $5.50 I do not work or have any intrest in this comapny but I tell you after all the frustration and run around I had trying to fix this Home depot power washer I deesided to help eveyone else out
I can be reached at atidavid@aol.com if you have any other questions

Posted on Oct 02, 2009

  • 10 Answers

SOURCE: Craftsman pressure washer with honda engine. low pressure

Sounds like pump is not making pressure. Thats why you get flow, but no pressure.
If it sat for awhile, check shaft connection to pump. Sometimes the impeller or shaft will shear partially due to corrosion when stored. Seals on pump valves could be gone too. Get an exploded diagram, usually from owners manual, easily found for this model. Parts list should have "pump repair kit" with everything needed to bring it back to life.
You and a friend put it on the bench to work on it and save your back. The pumps are pretty easy to take apart and put back in working order.

Posted on Oct 26, 2009

Testimonial: "Thanks, I think seals are the answer as it sometimes makes pressure for a minute then goes away. Jerry"

  • 92 Answers

SOURCE: Turn water on then actuate wand trigger. Pressure

You gave a very close solution yourself for the problem. But other leakages can cause such symtoms.Forexample a leaking head or a leaking chemical inlet. These can be caused because the spill valve (pressure control valve) is stuck. When this valve stucks it will leave a micro switch ON. So the machine keeps working with the gun closed. This will in turn creat internal pressure and damages the head, valves and chemical non-return and even damage outlet hose. So besides fixing the leakages you must check and service the spill valve. I often replace the spill valve. One must also checks if the micro switch is faulty. Now very important that what you mentioned that the machine cycles at one minute intervals, with trigger closed...this is most probably always the spill valve fault. If you open machine you see a place where there is a wire..this belongs to the micro switch...under you find the spill valve. Intake and suction valves may now also have a fault. Also there are systems with non-return valves at the machine outlet. You have to tackle by elimination. Fix the leakage..then tackle spill valve and micro switch.
Fulltech.

Posted on Aug 04, 2010

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1 Answer

I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

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Water comes out the nozzle, but low pressure? ( more than when the motor is not running)
I would check the check valves and the unloader.
If the amount of water coming out the nozzle is the same when the motor is running or not running.
Either the key that connects the motor shaft to the pump shaft is sheared, or the pump is trash.
No water comes out the nozzle would indicate a clogged inlet filter or blockage at the gun valve or nozzle.

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Most small pressure washers do not have an automatic throttle control to increase engine speed on demand (activated by trigger on wand). You must set the governor/throttle to about max. to get the rated pressure. A honda motor produces 5 hp when it is turning about 3600 rpm. To increase the life of the pump, use about 80 % of capacity of the pump and increase only for stubborn debris.

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This happens when air gets inside the hose. An air bubble of sorts is in the hose and will not build pressure until you blow the air out of the line. Start the pressure washer, turn on the water. pull the trigger on the gun. It will spitter and spatter and come to a trickle. release the trigger on the wand. Pull the trigger again and it will eventually work it self out.

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Pressure washer when you first try to start them that stop underload. We had the same type of problem with 11 hp Honda if you hold the trigger open the motor will be under less load we found by running the motor for about a minute it would work normally. Remember to make sure the water hose is turned on pull the trigger on, until water is coming out of the wand , now try and start the motor but also hold the trigger open, now you will not be building maximum pressure, after about a minute release the trigger and see if it keeps running.

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I have a Honda 3500 pressure washer. The motor


You need to start the unit and let it run for few minutes to get worm, make sure the water is fully open and the unit is fully cleaned. Push on the trigger on and off for few times not letting the unit shutdown, then start increasing the fuel mixture ¼ turn and push on the trigger again and see…this could be that the unit need service or the governor springs getting week if you got one on your unit…let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

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Sounds like the governor is stuck. My pressure washer speeds up when it has to pump. Don't know if yours uses vacuum to trigger governor or direct linkage. Good Luck.

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When trigger is engaged under pressure nothing happens.


Make sure all of the water is bleed out of it buy holding trigger down with motor not running until theres is not more bubbles or air that comes out..Make sure where the inlet for waters screen is not plugged..You may have to back flush washer to clean out or to unstick the pressure valve..Hope this helps you and have a great day

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