Professional Series Pressure Washer 4000 PSI

I own a 157471 North Star pressure washer. When I hook up the garden hose to the pressure washer, attach the high pressure hose to the gun, I don’t get water out of the gun. I can feel the pressure washer buidling up pressure but no water. Do I need a new pressure hose and maybe a new gun assy? I like to think the engine and water pump are fine. The engine starts up right away and runs like a champ. Please advise. I would like to hear some troubleshooting ideas on my problem.
thanks.

Paul

Experienced gardeners share their insights in answering this question :
HI it sounds like you may just have a blocked jet on the end of your lance. Please remove and clean.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

No water jet from the nozzle of the pressure washer > check if the nozzle itself is not clogged – if this is the case, clean or replace it. Also check if the water mains tap is correctly opened and that there is no problem in the flow of the suction hose.
There could be small leaks, holes, or tears in your garden hose or high-pressure hose that are causing your pressure washer to lose pressure when you pull the trigger. If you find leaks, plug the holes or replace the hose, which should solve your pressure issues.
How Do I Tell If My Unloader Valve is Bad? In most occurrences, the first symptom of an unloader valve going bad is no pressure from the wand when the trigger is pressed. This happens when the unloader valve gets stuck open and does not allow water to enter the hose and trigger.
Surging Pressure Washer Troubleshooting Tips

This can be confirmed when the trigger is released and the pressure builds back up to a normal level. It is telling the operator that the water supply does not meet the pump`s recommended flow rate. Check that the water supply and inlet screen are unrestricted.

Essentially, an unloader valve is a safety switch. It sends pressurized water into a by-pass by cycling it from the outlet side of the pump to an inlet or water tank. This process depressurizes the water and prevents pressure from building up while the pressure washer machine is idling.
Once your pressure washer and water source are turned OFF and you are unable to disconnect your hoses from the pump and gun it is generally due to the pressure that is still inside of the machine. To relieve this pressure simply squeeze the trigger to release any water and then try disconnecting hoses again.
DON`T Let the Machine Run Too Long Without Pulling the Trigger. Pressure washers operate under pressure, and that pressure needs to be released by pulling the trigger. If you let the machine run for two minutes or longer without spraying water, then you could damage the pump.
Pressure Wash Nozzle Function

When the gun`s trigger is squeezed, a pin pushes the ball aside, and the water shoots through the valve, through the lance, and out through the nozzle. Squeezing the trigger also activates the motor, pressurizing more water and ensuring an even, steady stream.

Will an airlock clear itself. Even if you run out of water, air should automatically clear in a well-constructed low-pressure water pipe system. The air should naturally climb to the top and discharge as the pipe system fills up.
Manually push the material out of the nozzle, once it has fully heated up. The material should slowly protrude out of the nozzle. If it doesn`t, this means your nozzle is clogged.
For most units, open the water pressure relief valve by simply lifting the valve up until the attached brass stem rises. When you do this, hot water will rush out of the pipe near the bottom of the water tank. Then, push the lever back down to close the valve and stop the water flow.
HOW DO THEY WORK? Automatic air release valves are installed at the highest points in a pipeline where air naturally collects. Air bubbles enter the valve and displace the liquid inside, lowering the liquid level. When the level drops to where it no longer buoys the float, the float drops.
FAQ for a Bad Water Pump

Leaking or residue from the front of the engine, overheating, and whining or squealing noises from the engine can indicate a bad water pump.

With no nozzle, only inlet water pressure (approximately 50 psi) will flow through the spray gun. Also, if a nozzle is sized too small, the machine will create more pressure—and if too large, less pressure.
Stuck valves are usually caused by a build-up of deposits and/orcorrosion on the valve stem. Because the fit of the stem in theguide is so snug, it doesn`t take much build-up on the valve stemto interfere with free movement of the valve within the guide.
The difference between regulator and unloader occurs when flow downstream is stopped. A regulator redirects flow through the bypass port, maintaining full system pressure. An unloader valve closes the fluid passageway and traps pressure in the discharge line.
An unloading valve is a pressure control valve that works on the principle of the hydraulic force as opposed to a spring force. When pressure builds to the point, where hydraulic force is greater than that of the spring force, then the valve spool is shifted.
If your pressure relief valve has no pressure, it`s likely that the balance hole has become plugged, the spring is broken, or the valve simply has a loose fit. In the case of a loose fit or broken spring, replacement is a must.
The “blowdown” is usually somewhere between 2 and 20%. Once the pressure has reached the “blowdown” amount, the pressure relief valve will close again so that you can use the water heater as intended.
Give Your Pressure Washer a Break

No matter how powerful your pressure washer might be, it`s never a good idea to leave your machine running for too long because doing so will increase the risk that it will overheat. Instead, most professionals suggest using a pressure washer in intervals of three to five minutes.

A clogged carburetor is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to run stall.
If the pull rope doesn`t retract, it`s likely that the spring inside the recoil starter is broken. The recoil starter can also fail to engage the engine when the rope is pulled. Replace the recoil starter if the spring breaks or if the recoil starter won`t engage the engine.
Little Or No Water Pressure

Begin isolating the problem by hooking a water hose to the washer`s inlet and turning it on. If water flows out the outlet, you know water is cycling through. If not, chances are your inlet filter is clogged. Remove and clean it, and you should be good to go.

Water leaks and inconsistent behavior are also signs of a potential failure in the near future. González: The typical signal when there is an unloader malfunction is a reduction of flow through the nozzle, which results in pressure loss. Dean: Typical symptom of an unloader failure is a sudden smooth pressure loss.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Water stopped coming out while using it. viewing port on right side shows a red dot in center.
ANSWER : The most common cause of this is the pressure regulating spool valve sticks in the bore. As the pressure builds with the wand closed, the spool moves against a spring to block additional water from entering. When wand is triggered, pressure drops and more water is admitted. Remove the spool and clean the bore with crocus cloth on a dowel rod. Replace the O Rings on the spool and lube with a bit of plumber’s grease and re-assemble. Often you can get a kit of O Rings for the washer or you can get EXACT replacements at a supplier… they MUST be the exact size as the originals.

Water will not come out of sprayer – Karcher G 2600 VH Gas Pressure Washer
ANSWER : Either the checkvalves closed on the inlet or the chemical injector on the output may be clogged they will have to be removed for inspection.

I bought a honda pressure washer power boss 3000. I load the gasoline, start the machine, but pressure water is not coming out
from the trigger. i tried so many things , but can t get started.
ANSWER : If you are using a water tank for water supply, remove the water supply line from the pressure washer and connect a water hose from a faucet. Turn the water on, then crank the engine. Pull the trigger of the spray gun until water comes out. When then water starts to spray properly the release the trigger, shut engine down with pressure on the line then reconnect the water supply from the tank to the pressure washer. If this fixes the problem then the problem was “air-locked”! Happens alot with new pressure washers that have never been run. If you need any other help, please email me @ [email protected]

I have a Northstar pressure washer powered by a honda GC160 engine. The last time i used it, water leaks from the bottom of the unit, whether it is running or not. When running, the pressure is fine. I have felt underneath and it appears that the water is coming from the second opening from the rear. Is there a pressure relief valve there. I have a manual but cannot find any descriptors for underneath the motor.
ANSWER : This is a piston seal issue. You can get a kit to rebuild the pump.

Culligan water filter is leaking – Culligan HF-365 Whole House Water Filter Housing
ANSWER : Turn off water
Remove filter and seal ring.
Look at mating surfaces.
Usually the cast metal has eroded away.
If it is the sealing ring , replace it. If it is the casting , replace the whole thing. Other brands may be an option.

Couple of guys tried to help me on this, perhaps you guys could come back. I forgot to mention there is a pressure tank bladder type on the discharge side. Could the air in this tank be messing with the prime. I checked the intake. It has water in it after bleeding air from the discharge system where before it was dry before purging air. I think there is air in the system and wonder if it is coming from the pressure tank?. i open up one of the discharge valves and a lot of air comes out. Should I put a valve on the pressure tank to take it off line until I get water from the well?

Mar 12, 2010 – Could it be the check valve? I took it off and the flap appears to be working correctly. This well has been here a long time. Never given me any problems. I do have galvenized couplers on the discharge and intake sides. Old. Could these be leaking even though they show no sign of water? The discharge is able to hold 30 pounds easily overnight. I do not hear any vacuum in the intake when I take it off. Could the pipe to the well have a leak? I know I would have to insert a sleeve but I do not want to go through the hassle if I do not have to. I had put on a brand new pump from the hardware store that did the same thing so I think that would elliminate the pump as being the problem.
I disconnected it for the winter and rehooked it up. The galvanized couplers on the discharge and pump side are old but do not appear to be leakeing as I taped them well. The check valve seems to be functioning well as I took it off and the flap works correctly. The well is not pulling water. there does not appear to be a vacuum on the check vale when I losen it. could the check valve be bad? I am aware I might have to resleeve the well, but do not want to hassle with this if I do not have to. I want to eliminate everything else first. i put another brand new pump on it to see if it was that. That partiuclar pump which was the same thng did not work either.
I took the pump nose off and looked at it. The one way valve appears to be working fine. The impeller is working fine also evidenced by when I turn it on witht the discharge cap off, water shoots out. When I open one of the discharge valves and turn it on, the pressure drops to 10lbs. At this point the prime water has moved through the pipe and and the pump does not soound like it has any water in it. I pull the cap off and have to “reprime it again.” It again goes back to the pressure gauage rapidly fluctuating while pump on. I disconnect pump on intake side I hear no vacuum. The guage is on the discharge side. The seals on the pump nose do not look frayed or damaged. The pump is not leaking water in any of the joints. The pipes on discharge and well side do not appear to be leaking.

ANSWER : My friend, please boil your question down. Your title has to do with riding mowers but the leaking, bladder, impeller, air bubbles, pressure tank, check valve comments seem to be migrating toward a pump of some kind – well? spa? pool? irrigation?

Briefly, any system that involves a water source, a water moving device, water storage device and ultimate useage is subject to leaks … into the system and out of the system. If this is a well and you have air in your system, your pump may be sucking air at the well or any loose connection between the tip of the pipe and the inlet to the pump. Your bladder could have failed but from what I can get from your comments, this is not the case. On the pressure side, neither air nor water will leak in … only out.

Please recheck all connections. Make sure your check valve is installed correctly and not leaking. The check valve assists the foot valve, which may have failed.

I am more inclined to think your well may be at the end of its useful life. To prove or disprove, you could have a plumber put a vacuum gage on your pump. He or she can answer this question is about 90 seconds based on this test. Expect to pay for one hour of time, which will be less than the time you have already invested in your project.

I have a K3.68m. I hook up the water turn, on the unit, the hose pressurizes but when I pull the trigger nothing happens. This unit is only about a year old and only used twice. It did the same thing intermittently before. The trigger has a different feel like a switch is not actuating or something when it does this. Please advise. Reg
ANSWER : Sounds to me like you have a partially blocked jet on the end os the lance. If this is not clear then the machine will not start correctly.

Has no pressure, builds up when not holding trigger on gun, but when i press trigger shoots of with pressure the nothing just water comes out.
ANSWER : Bad pump