Question about Northstar Professional Series Pressure Washer 4000 PSI

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I recently purchased a northstar 4000 psi pressure washer. I had the same series pressure washer for the past 6 years and used a downstream chemical unloader quick connect to pull chemical. I attached it to the pressure washer and it is not pulling. I havent modified anything and I dont want to pull chemical through my machine.

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The injector might be worn out or have something inside of the valve causing it not to ****. If you are using a new high pressure hose or a longer hose this may also have an effect over the injector not working.

Posted on Oct 25, 2010


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1 Answer

Why is my unloader valve opening and closing when I'm not squeezing the trigger\

thats exaclty what a unloader valve does it unloads the pump when the trigger on wand is not depressed , it should however reseat and close off when trigger is pressed giving full presure to wand tip

May 11, 2014 | Northstar Professional Series Pressure...

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I was able to use soap all last season, this year, i cannot get it to come thru, i know all about the low pressure deal, it seems to be clogged/ is there any way to specifically clean it where it enters...

Soap injectors are easily clogged or will not work because of design (air leaks will prevent chem from entering if chemical has to be drawn uphill) . They work with siphon action and will only work with very little pressure at the tip but good volume. If your siphon valve has the ball in place, however is missing the fine spring that holds the ball against seat (fine spring holds ball aginst intake fitting), the soap will not be sucked into stream. If ball and spring are in place, try elevating the soap container higher than the opening of the port (gravity feed may help to feed soap into system) . May be better to use an aftermarket downstream injector valve sold on ebay or many outlets. Cost about $20 but work better and are adjustable to save on soap. Search ebay for "Chemical Injector For Pressure Washers" or google "Pressure Washer Downstream Chemical Injectors" Various prices but lower price units work better than factory. Good luck

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1 Answer

Oil in sightglass on pump is low, what type of oil goes in it.

In the absence of any instruction manual, you can safely go with any good quality SAE 30 motor oil.

Jan 22, 2011 | Northstar Professional Series Pressure...

1 Answer

The water will not pressurize , why not

If the unit is running and there is a water supply, the relief valve is probably stuck open. Locate the valve, remove it, check the spring and ensure that the poppet moves freely in the housing. Reassemble the valve and try the machine.

Jan 15, 2011 | Northstar Professional Series Pressure...

1 Answer

I have a trailer northstar unit model# 66DX that looses pressure after you press the trigger. The pressue is great at first but dwindles from there. I have resealed the pump and replaced the spring valve...

Most likely problem is that the unloader is bypassing water. As unloader wears it will by pass at lower pressure. Try lowering the pressure at the regulator to lowest setting then raise pressure a little at a time untill unloader releases then lower to prevent unloading. Using a slighly larger tip will do the same thing. Using a larger tip size lowers pressure.

Sep 13, 2010 | Northstar Professional Series Pressure...

1 Answer

Have a northstar model 157182d with an electric motor and the suction tube that pickups soap or chemicals does not work. Not sure also what position it needs to be in when I want to use it.

Hi there PBM,

The siphon will only work at low pressure.
The wand should have several different nozzles. There is a specific low pressure nozzle.

If they are color coded, it is usually black, If nothing else, look for the one with the biggest opening. and attach it.

The siphon will work with it

Best regards

Apr 18, 2010 | Northstar Pressure Washer 3000 PSI

1 Answer

What is the red cap on the cat pump for? And why is oil or some type of redish colored fluid coming out of it?

The red cap is for adding lubricating oil for the crankcase in the pump. If oil is coming out of it while it is running a seal in the head wore out and water is getting into the crankcase and displacing the oil.

Mar 03, 2010 | Northstar Professional Series Pressure...

1 Answer

What type of fluid in adx 3030 pump/how much?

any good quality ANTIFOAMING OIL as for quantity I would be guessing but there should be a oil marker attached to the oil cap ---rule of thumb approx 1/2 way between 1/2 and 3/4 full .

Nov 06, 2009 | Northstar Professional Series Pressure...

2 Answers

Troy-bilt 2200 psi pressure washer

I have a Troybilt Model 2200 PSI Pressure Washer in which I have used only 2 times in the past 2 1/2 years. Went to use it this past weekend and the pump in not working. Water shoots out of the side. I bought this brand and model as I thought Troybilt was suppose to be so good. Went back to where it was purchased and had no success but to say I could buy another pump or take it in to be repaired. I believe that this power washer should be replaced at no charge. 2 uses does not constitute a few hundreds of dollars.
Have you to heard anything concerning pump problems on this particular model? Thanks for any advice. .

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