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PostPosted: Wed Feb 13, 2019 10:25 pm 
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Joined: Tue Jan 01, 2019 2:26 pm
Posts: 26
Location: TO, ON.
I ordered a replacement seal kit for my old Powermaster 760 but my Canadian version had a second relief valve attached to keep the fps below 500.
The relief valve also anchors to a brass three way valve body inside the main valve body near midpoint, so my replacement front valve seal is useless for fitment.
These kits that are now standard 3 O-ring, spring, front seal, and rear seal don't come with any parts to reseal the relief valve.
There is a tiny o-ring that is on the base of the relief valve thread so it can seal to the main valve body and it is clearly deformed from time and pressure.
I'd like to know where members are getting o-rings for their guns, or if there are suppliers of o-rings around Toronto?
The local plumbing supplier by me just shrugged. Princess Auto has mega packs of o-rings but no guaranty the smallest in the kit will work.


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PostPosted: Thu Feb 14, 2019 6:24 am 
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Joined: Thu Sep 01, 2005 1:41 pm
Posts: 979
Location: GTA
It's been a long time since I've worked on one of those. I seem to recall one of the 13xx bolt orings fitting, 004, or 006, I think. But my memory is foggy.

Another fix I've used in a pinch is to wrap the part that inserts into the main valve with Teflon tape. Put the T-tape over the old oring.

Third fix, replace the valve.

Getting an oring kit isn't a bad idea. It's handy to have a few sizes on hand. Princess Auto puts them on sale for about $10. Can't beat that.


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PostPosted: Thu Feb 14, 2019 7:24 am 
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Joined: Thu Apr 16, 2015 6:49 pm
Posts: 138
Location: S-E New Brunswick forest
I have found that hydraulic repair shops have an incredible O ring inventory. The have bailed me out many times in the past for all sorts of machinery.


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PostPosted: Thu Feb 14, 2019 11:31 am 
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Joined: Tue Jan 01, 2019 2:26 pm
Posts: 26
Location: TO, ON.
Woody wrote:
It's been a long time since I've worked on one of those. I seem to recall one of the 13xx bolt orings fitting, 004, or 006, I think. But my memory is foggy.

Another fix I've used in a pinch is to wrap the part that inserts into the main valve with Teflon tape. Put the T-tape over the old oring.

Third fix, replace the valve.

Getting an oring kit isn't a bad idea. It's handy to have a few sizes on hand. Princess Auto puts them on sale for about $10. Can't beat that.


I was considering the teflon wrap idea but hoped to find an o-ring.
I'll look into the 13xx o-rings and hydraulic shops first.
Seems hard to find the valve complete, even the body shows unavailable many places.

If I could get a good seal on the connection point and the gun gets good pressure and like new function, I was considering blocking the exit of the relief valve and removing the internals to see if that "free" volume gives me any benefits.


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PostPosted: Sat Feb 16, 2019 12:58 pm 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2428
Location: Winnipeg, Canada
I've got one in one of my 7xx something or anothers here, and I soldered the hole closed, after threading out the useless mechanism.
Benefit of this is the volume is a bit of an increase over the current 7xx/13xx line... body on mine is brass, and I used an aluminum insert to keep the 60/40 solder from flowing into the valve.

-D.S.

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