Generac 2700 psi pressure washer

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  #1  
Old 05-04-17, 03:05 PM
tpm
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Generac 2700 psi pressure washer

Hello
I was using my pressure washer for about an hour and a half, ran inside to get ear protection. When I came out I noticed water was coming out of the black relief valve and couldn't get any water out of the nozzle. Waited for it to cool down but still will not discharge water. Engine sounds fine and water supply was always on.
I can post pictures of it if needed

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  #2  
Old 05-04-17, 04:00 PM
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An hour and a half in you went for your ear plugs. I suppose better late than never.

I assume you left the engine running when you went inside. How long was the pressure washer left without someone pulling the trigger to get fresh water into the machine?
 
  #3  
Old 05-04-17, 04:17 PM
tpm
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5 minutes at most the trigger wasn't used. But the engine was running and the garden hose was on.
And I have bad hearing to begin with so I guess I sho have thought about hearing protection sooner.
 
  #4  
Old 05-04-17, 04:27 PM
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I called Generac support and they were of no help. Only gave me a number for a nearby service center
 
  #5  
Old 05-04-17, 05:56 PM
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5 minutes without the water going is enough to have overheated and melted the pump. Having the water on doesn't really make any difference because the water is not flowing, it's just sitting there in the pump without being able to provide any cooling action. Like having water in your radiator but no belt on your water pump to keep it circulating. You will overheat in no time. Maybe if you're lucky, the safety valve melted and blew out before the rest of the pump got damaged and this may be what you're seeing.
 
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Old 05-04-17, 06:08 PM
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You mean the relief valve right? After it cooled and I restarted it there was still no water through pressure hose and relief valve wasn't leaking
Guess I'll try it tomorrow when it had a chance to really cool down but thinking it's probably a paperweight now

Thank you
 
  #7  
Old 05-05-17, 05:11 AM
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It can be hard to understand but you need to think of the energy. All the power/energy the engine is producing is going into the pump and from there it has to go somewhere and the only place is into the water. If you aren't spraying the water in the pump isn't moving to be replenished with fresh, cold water. The same tiny bit of water in the pump keeps getting compressed (making heat) and recirculated through the pressure relief valve to be pressurized again making even more heat. Over and over again. Unlike water at sea level pressure that boils at 212f (100c) the water in the pump is under tremendous pressure so it can get much, much hotter. You could have water at 600f or more, hot enough to melt seals and plastic parts.
 
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Old 05-05-17, 05:44 AM
tpm
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Thank you. I do understand but I was thinking the relief valve was designed to prevent that by expelling hot water with cooler water. Guess I was wrong.
In the future I'll turn it off right away.
Trick now is to find one as everyone is back ordered. I really want to get a Generac as it was best reviewed in the 2800 psi range.
Thanks again
 
  #9  
Old 05-05-17, 11:59 AM
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Relief valves don't dump water out of the system. It opens a passage from the high to the low pressure side of the pump. So, when you let go of the trigger on the gun everything stays at full pressure and small amount of water at the pump goes in circles until you pull the trigger. If the relief valve expelled it would be dumping water every time you released the trigger on the wand.

You don't need a whole new pressure washer. You should be able to fix your pump or replace the whole pump assembly but the engine doesn't need to be replaced. And, a replacement pump should be easy to find. I did a Google search for "generac pressure washer replacement pumps" and many pumps and sites selling them popped-up.
 
  #10  
Old 05-05-17, 12:57 PM
tpm
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I found the cost of the pump to be half the cost of a new unit so I ordered a new one. It was 5 years old
Plus if the unloader valve is also bad it just wouldn't be worth it
 

Last edited by tpm; 05-05-17 at 01:11 PM. Reason: Adding content
  #11  
Old 08-13-17, 09:42 AM
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Wow I have same issues this year ,last year work OK, each year drain and used Pump Saver. Now this year went to use it and NO pressure out put. Pump is RMW2.5G28.brass head . NO pressure output - Eng off and no Hi side hose on it water will run through it ,start Eng water will Stop going through after 1 Min or so thermal valve will go off /on -off/on ..
I see No leaks , If I back off way off on the adjustment on the unloader water will start to go through but soon as you increase unloader adjustment water will stop going through .. Thinking its the unloader frozen ,removed- all is nice and clean and free moving and No rust on spring ,O ring have No marks or cuts all looks good .
Open for a Fix ??
 
  #12  
Old 08-13-17, 10:18 AM
tpm
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I wound up getting a new pump of eBay so my kids could use it. May be your only option
 
  #13  
Old 08-13-17, 11:01 AM
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If need be I will buy a New Pump but if this can be FIX for a dollar or two for O-Ring or seal why spend almost $100 or so for a clone pump from eBay and seller gone next week with your warranty !
I have NO corrosion build up as you see in some and I use Pump saver each year so do to that I am more inclined a seal or O-Ring ??
 
  #14  
Old 08-13-17, 11:24 AM
tpm
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I myself wouldn't be able to pinpoint what the problem is. Maybe you can try the cost effective fix first and see how it goes
 
  #15  
Old 08-18-17, 11:24 AM
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Detergent injector was lose .Per RMW2.5G28 Parts Breakdown #41,39 and 38 Going to replace the O-Ring for it and reinstall it and see if its a Go !
 

Last edited by Dan12; 08-18-17 at 11:40 AM. Reason: Photo
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