Relief valve rebuild

Here is where we can talk about all things Cub and then some. Please follow the golden rule and respect others.
This is a free forum and all pictures posted here are for public consumption. They are free to be used as long as you are not using them in a for-profit manner. Also, any pictures subject to copyright or permissions will be removed.
Post Reply
User avatar
ksanders
Posts: 930
Joined: Mon Sep 06, 2010 2:56 pm
First and Last Name: Kevin Sanders
Location: Sellersburg, Indiana

Relief valve rebuild

Post by ksanders »

The relief valve on my 782 suddenly started seeping while not running. Didn't see anything while it was running. I turned it down on the lathe and took it apart. The small oring inside is a 3/16 x 5/16 x 1/16. I tried one from my kit and one from two different parts stores. The new ones just aren't as thick as the old one. The plunger will fall out if you beat the valve on a table or something with a new oring. Is this normal? I'm sure someone here has done this. I want to ask first because you have to weld it to try it so rather get it the first time. I could put a second small oring in there to make it tighter but that's risky too. It still has to release when not running.
From the first Original to the last x82 Series... you can't beat an IH Cub Cadet!!!

User avatar
Jeff in Pa
Posts: 665
Joined: Sun Sep 12, 2010 8:06 am
First and Last Name: Jeff Derstine
Location: Zionsville,PA

Re: Relief valve rebuild

Post by Jeff in Pa »

Maybe you need a different size O ring. What size is the groove and the bore?

You can also try http://www.mscdirect.com and http://www.mcmaster.com for O rings.
125 & 125 with hydraulic lift

User avatar
ksanders
Posts: 930
Joined: Mon Sep 06, 2010 2:56 pm
First and Last Name: Kevin Sanders
Location: Sellersburg, Indiana

Re: Relief valve rebuild

Post by ksanders »

Thanks to a member here and gentleman elsewhere that just did this same rebuild, it was confirmed the standard 008 oring was correct and doesn't have a lot of friction. I cleaned and reassembled and tack welded the valve back together. I ran around a while in forward and reverse, cycled the hydro lift, and shut It down. Two days later and valve is still dry on top. We'll see how it holds up. This job is much easier than everyone makes it out to be.
From the first Original to the last x82 Series... you can't beat an IH Cub Cadet!!!

User avatar
dag1450
Posts: 2356
Joined: Fri Apr 01, 2011 3:16 pm
First and Last Name: Dave Gibson
Location: Chalfont, Pa

Re: Relief valve rebuild

Post by dag1450 »

What....no pics? Still sounds like a job big Mike might get stumped on. Is a lathe a must to cut old welds? What kind of welder was used ....is it just tacked or does it need to be a solid weld that if it leaks it will cause trouble.....cause I have seen some of his welds :o
Great job!
127, 1650, 1572, 1872, 2072 . A mower, blower and blade for each.

User avatar
ksanders
Posts: 930
Joined: Mon Sep 06, 2010 2:56 pm
First and Last Name: Kevin Sanders
Location: Sellersburg, Indiana

Re: Relief valve rebuild

Post by ksanders »

It was about 30 degrees Friday when I did this and figured pics weren't a necessity even though I considered it. You had to bring it up Dave :lol:
There's a factory crimp on the bottom that I chucked in the lathe and couldn't have taken a couple minutes to have removed. It isn't big so an angle grinder or dremel tool could probably get the job done with a steady hand. Just clean out the metal dust good while apart. I wouldn't say a lathe is essential, just darn convenient.
Rewelding I just tacked 3 spots with the mig welder on the bottom cap. Two or 4 spots would work too, I just chose 3. There's a hole in the cap so leaking shouldn't matter if it did. I'd advise against welding all the way around because heat with the orings wouldn't be good. I just did one quick "tack" in the areas and chose against the Lincoln stick welder just so I could do that one quick tack and keep heat down. An experienced welder could stick weld it easily. I can weld either way decent but only had one shot and played it safe as I'm not a professional. I cleaned it up with a hand file but looks on removal and the weld back together are not important obviously. It looked nice when done but isn't seen.
Having done it once, i'll back off on my one hour completion time claim but doing this job in two hours from disassembly to cleanup and reassembly would be reasonable.
From the first Original to the last x82 Series... you can't beat an IH Cub Cadet!!!

Klapatta
Posts: 1352
Joined: Mon Sep 06, 2010 2:25 pm
First and Last Name: Kenneth LaPatta
Location: Rockingham VT.

Re: Relief valve rebuild

Post by Klapatta »

For what it may be worth, pretty sure I watched a very comprehensive video on You Tube about this some years ago.
No links to it though. It may be under Sunstrand 15U valves or something like that, I recall a parting tool used in the lathe being used and welding involved but little else.

User avatar
BigMike
Posts: 1351
Joined: Mon Sep 06, 2010 8:45 pm
First and Last Name: Mike Andrews
Location: Niles,Michigan

Re: Relief valve rebuild

Post by BigMike »

dag1450 wrote:What....no pics? Still sounds like a job big Mike might do :o
Great job!
Fixed it for ya there greasy fingers :D

User avatar
Jeff in Pa
Posts: 665
Joined: Sun Sep 12, 2010 8:06 am
First and Last Name: Jeff Derstine
Location: Zionsville,PA

Re: Relief valve rebuild

Post by Jeff in Pa »

BigMike wrote:
dag1450 wrote:What....no pics? Still sounds like a job big Mike might do :o
Great job!
Fixed it for ya there greasy fingers :D
Want to annoy your welder friends? Send them this pic :lol:

welds.jpg
welds.jpg (65.69 KiB) Viewed 5370 times
I sent that to one of the welders where I used to work and he was offended :o
Last edited by Jeff in Pa on Mon Dec 11, 2017 4:54 pm, edited 1 time in total.
125 & 125 with hydraulic lift

User avatar
dag1450
Posts: 2356
Joined: Fri Apr 01, 2011 3:16 pm
First and Last Name: Dave Gibson
Location: Chalfont, Pa

Re: Relief valve rebuild

Post by dag1450 »

Jeff in Pa wrote:when I used to work :o
.....man...I guess I'm the only one not retired around here :lol:
Yes Mike I do have greasy fingers....." It's the wood that makes it good". :lol:
127, 1650, 1572, 1872, 2072 . A mower, blower and blade for each.

User avatar
Jeff in Pa
Posts: 665
Joined: Sun Sep 12, 2010 8:06 am
First and Last Name: Jeff Derstine
Location: Zionsville,PA

Re: Relief valve rebuild

Post by Jeff in Pa »

dag1450 wrote:
Jeff in Pa wrote:when I used to work :o
.....man...I guess I'm the only one not retired around here :lol:
Yes Mike I do have greasy fingers....." It's the wood that makes it good". :lol:
I goofed, I edited it to read "where I used to work". Still working :beer:
125 & 125 with hydraulic lift

Post Reply