Question about Comet ZWD 4040 G-K Pressure Washer Pump With Built-In Unloader

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What grade of oil do i use in the zwd 4040 hi pressure pump

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30 weight NON DETERGENT. Autozone and other autoparts stores usually have it. It is often hard to find, so you might have to ask them where they hid it.

Posted on Dec 16, 2014

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Posted on Jan 02, 2017

kel1guy2002
  • 3740 Answers

SOURCE: I have a Pressure Washer

Derek, Hi and welcome to FixYa. I am Kelly.

I just now happened across your post and note it is 3 months old. Hopefully you already have the problem solved.

If not.. looking at the pump history of having the un-loader valve replaced it sure seems that the current un-loader valve is sticking. When an un-loader valve is removed the internal housing is sanded smooth and everything about the un-loader valve is coated with Lubriplate #105 White Grease. I get the feeling that who ever did the un-loader valve repair failed to sand / clean the housing and use White Grease for the final assembly.

You should remove the valve... Sand the housing and get some Lubriplate #105 white grease (auto parts store) in a tube. Lubricate it liberally and reassemble it. If should work fine after that.

Thanks for choosing FixYa,
Kelly

Posted on Dec 07, 2010

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The little jugs of pump oil at home improvement stores are usually SAE 30W (non-detergent) crankcase oil. 75W90 gear oil seems like a better choice; I personally use synthetic marine lower unit gear lube in my pressure washer pump. It's a little more expensive, but I think the formulation gives better moisture resistance. Besides, the pump takes a fairly small amount, and I don't change it very often at all.

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1 Answer

I have a Pressure Washer with a Comet ZWD 4040 Pump. It recently had a new Unloader Valve fitted. It has suddenly developed a problem, the pressure goes up to 3000psi and then drops back to 2000psi. I...


Derek, Hi and welcome to FixYa. I am Kelly.

I just now happened across your post and note it is 3 months old. Hopefully you already have the problem solved.

If not.. looking at the pump history of having the un-loader valve replaced it sure seems that the current un-loader valve is sticking. When an un-loader valve is removed the internal housing is sanded smooth and everything about the un-loader valve is coated with Lubriplate #105 White Grease. I get the feeling that who ever did the un-loader valve repair failed to sand / clean the housing and use White Grease for the final assembly.

You should remove the valve... Sand the housing and get some Lubriplate #105 white grease (auto parts store) in a tube. Lubricate it liberally and reassemble it. If should work fine after that.

Thanks for choosing FixYa,
Kelly

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