92 B7100HST- lift cylinder ring

hodge

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John Deere 790 John Deere 310 backhoe Bobcat 743
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I'm struggling to find a 3 point lift cylinder ring to order. A friend has a 92 B7100HST, and the 3 point won't stay up. It drifts down quickly, in a matter of a minute. Anybody have a part number?
 

hodge

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John Deere 790 John Deere 310 backhoe Bobcat 743
Nov 19, 2010
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Love, VA

TheOldHokie

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windyridgefarm.us
I found that diagram, as well as some on German-Blisse. When I look up the part numbers, they show as O-rings. Isn't the seal ring for the piston square? The one that I replaced on a Ford tractor was.

It looks like 190, part #67211-36420, would be it, but it's called a support or back up ring- and it doesn't look right.
This is a Kubota tractor not an old Ford and that is the Kubota parts diagram. The B7100 cylinder uses a standard rubber oring and a backup ring. You need both and they need to be installed in the correct order.

Dan
 
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hodge

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John Deere 790 John Deere 310 backhoe Bobcat 743
Nov 19, 2010
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Love, VA
Thank you.
 

Caden

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1979 B7100
Apr 16, 2026
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Virginia
Get the O ring that goes on the cap plate also. (plate with 4 bolts)

I did not buy one (ignorance) and found that it is an odd size. My O ring assortment did not have one that was quite right.

The cylinder ring is rounded, yes. A very thick O ring.
 
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