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Helpful ReplyHot!CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE

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pd94007@yahoo.com
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2018/08/26 13:46:04 (permalink)
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CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE

My Craftsman Power washer model 580.752630 is making a grinding noise when it starts and is running, the noise stops when I engage the spray gun and use it. 
The  water pressure when the gun is engaged appears to be fine during use.  
MdStamen
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2018/08/26 15:30:31 (permalink) ☄ Helpfulby pd94007@yahoo.com 2018/09/12 21:16:20
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Sounds like  the  UNLOADER VALVE part number AR42118 or 1000.9856
doogie
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/04/29 18:10:31 (permalink)
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Were you able to fix it with part listed above? I have same pressure washer. Googling some say the unloader is built in the pump and you can not replace it. Sears parts don't show an unloader valve replacement. But some site show that AR42118 part for the pump. I don't want to order unless I'm sure it will work.
 
Thanks.
doogie
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/05 19:31:19 (permalink)
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Well I went ahead and order AR42118 and it worked. Pressure washer working. Now I just need to go to work washing the house and drive way.
MdStamen
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/05 21:07:07 (permalink)
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That's great news.
doogie
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/06 17:39:35 (permalink)
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Well spoke too soon. It runs for about 10-15 mins then shuts off. Easy to start back up but then runs less time about 5 mins, Then shuts off again. easy to start again but then run less time and shuts off again. Then it would not start again. Waited about 10 to 15 mins started up but would die about 5 mins later. 
 
I have replaced 208673GS Thermal Relief Valve and AR42118 unload. Not sure what else it could be wrong with it. About ready to buy an electric power washer.
 
oh the little nut on the screw thing sticking out of the AR42118 about vibrate off, what is that for anyways?
post edited by doogie - 2019/05/06 17:42:21
MdStamen
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/06 17:50:45 (permalink)
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The un-loader needs to be adjusted. Does it shut off while you are spraying? The unloader takes over when you are not spraying and allows the water to bypass.I assume you are locking up the pump.
doogie
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/06 19:03:48 (permalink)
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I tried to just run it without spraying water but it does shut off after awhile too. But easy to start back up not like before where very hard to pull start unless I held sprayer on which was releasing pressure. Which is why I replaced the unloader. So It will shut off while spraying and not spraying.
 
Been thinking about it and it did shut off quicker when I was not spraying. So maybe unloader does need to be adjusted.
post edited by doogie - 2019/05/06 22:05:26
doogie
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Re: CRAFTSMAN POWER WASHER MODEL 580.752630 MAKING GRINDING NOISE 2019/05/06 22:08:07 (permalink)
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How do you adjust this type of unloader? Most video I watched all have handle you turn to adjust pressure. I take it now once I get it adjusted right I tighten the little screw on top.
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