Three-way Selector Valve Leak

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tractorfan
Posts: 79
Joined: Wed Aug 13, 2014 8:25 am
Location: Ceredigion

Three-way Selector Valve Leak

Post by tractorfan » Mon Mar 11, 2019 3:40 pm

I have an oil leak coming up the spindle when the valve's open, so I suspect the o-ring needs replacing, but will I have to drain the hydraulic oil before removing the spindle? I have a vision of the plunger flying out under pressure!

Thanks.
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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Three-way Selector Valve Leak

Post by ollek » Mon Mar 11, 2019 3:53 pm

The 3-way valve is higher up than the hydraulic oil level, as you can see if you look at the tractor. It is obvious that You will get pressure at the 3-way valve only when the 3-point hitch is lifting. There is no oil pressure if the engine is switched off. However, there will be some oil in the lift cylinder and therefor it is best to lower the link completely before removing parts.

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tractorfan
Posts: 79
Joined: Wed Aug 13, 2014 8:25 am
Location: Ceredigion

Re: Three-way Selector Valve Leak

Post by tractorfan » Mon Mar 11, 2019 3:57 pm

Will do! Thank-you!

dbdgc
Posts: 9
Joined: Mon Jan 28, 2019 1:24 am
Location: New Zealand

Re: Three-way Selector Valve Leak

Post by dbdgc » Mon Mar 18, 2019 10:31 pm

I haven't much experience, but have just changed all the seals in my 3 way valve and it was very easy to do.
I took the complete unit off and there wasn't much oil that leaked while doing so.

You can change that single seal by just removing the stem and next no oil will leak out while doing so.

I got the complete seal kit for about 7 pounds (13 NZD)

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tractorfan
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Location: Ceredigion

Re: Three-way Selector Valve Leak

Post by tractorfan » Sun Mar 24, 2019 5:55 pm

Thanks for the replies. Where should that particular o-ring fit? I've removed the screwed bush and then the mills pin followed by the spindle, but there's no sign of the original o-ring, and I can't see where the new one should go.

Thanks.

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ollek
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Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Three-way Selector Valve Leak

Post by ollek » Sun Mar 24, 2019 6:13 pm

The following is a link to the parts catalogue page for the valve https://partstore.caseih.com/us/parts-s ... 85ar351388 Have a look inside the screwed bushing (ref 6). You may find a groove for a O-ring (ref 3) that seals the spindle to the bushing.

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tractorfan
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Joined: Wed Aug 13, 2014 8:25 am
Location: Ceredigion

Re: Three-way Selector Valve Leak

Post by tractorfan » Mon Mar 25, 2019 3:45 pm

The plot thickens - I've now dismantled three spindles and have found no o-rings in any of them. So the mystery of how to stop the original leak remains. I think I'm missing something here...

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tractorfan
Posts: 79
Joined: Wed Aug 13, 2014 8:25 am
Location: Ceredigion

Re: Three-way Selector Valve Leak

Post by tractorfan » Mon Mar 25, 2019 4:33 pm

Solved! The o-ring was on the plunger.

Thank for your replies.

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