Pressure washer over pressure and burst hose.

Reply

  #1  
Old 06-04-08, 10:38 PM
Member
Thread Starter
Join Date: Jun 2008
Posts: 12
Pressure washer over pressure and burst hose.

I have a Sears 3000 psi washer with a 9 hp Briggs engine. The pump model number is XMV 3G30.
The problem is that it went crazy and was stalling the engine until the pressure hose burst.The hose was in excellent condition until this happened.
I am ignorant of how these things work,however, but I read somewhere about an unloader valve that may be the problem. What do these things look like, where can I find it, and how can I check it?
I am mechanically proficient and have more that adequate tools to disassemble this thing. I just don't want to mess something up that will cost me lots of money.
Any help will be appreciated. Thanks in advance. Mike
P.S. This is my first post.
 
Sponsored Links
  #2  
Old 06-04-08, 11:06 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
Wow, there should have been a pressure relief valve that kept this from happening, but yes, the unloader valve apparently stuck. The unloader is different and looks different on different pumps. Go to sears website and look up your model number on partsdirect. You can view a diagram and parts list of your machine there.
 
  #3  
Old 06-07-08, 09:53 PM
Member
Thread Starter
Join Date: Jun 2008
Posts: 12
I went to the Sears website and found the parts list and(yikes!)price. They want $101.00 for that gold plated item. Mine bolts to the pump head and has the pressure regulator built in with it.
It doesn't appear like there is much to them. I tried to get the plunger out of it but it was not going to come out without applying some force. I don't know if it will come apart or not. Can these things be rebuilt by the average Joe, or must they be replaced? The reason I ask is Sears lists the part as an unloader "kit".
Thanks,
Mike
 
  #4  
Old 06-08-08, 08:39 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
Yes they can be rebuilt if they are in good enough shape to rebuild. If you can't get the valve out, or scratch/damage it or the valve body while trying, you'll need another.
 
  #5  
Old 06-11-08, 02:32 PM
Member
Thread Starter
Join Date: Jun 2008
Posts: 12
I found the manual for this thing!!!! Not much help beyond drawing of the pump.
Having read the manual, it has brought up a question. I want to change the pump oil while I am messing with this thing and the book says use non detergent 30 weight. On the pump sticker it says use 20w40. Which oil should I use or do you have a recommendation which you feel is better?

Thanks,
Mike
 
  #6  
Old 06-11-08, 07:43 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
I'd probably go with the 30weight myself...especially since you'll probably never find a 20-40 weight oil.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes