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I was recently mowing with my rotary cutter and noticed a clanking sound. I stopped the machine and noticed that one of the snap rings was missing on the rockshaft that controls the lift arms on the 3PH. The missing snap ring allowed slack from side to side that was causing the clanking sound. An O-Ring also had come out of place because of the slack. I pushed the O-ring back in place and installed a new snap ring. There seems to still be a small amount of slack but i think that is normal. My question is could this have affected anything else internally? it seems to work fine. What is the purpose of the O-ring? I could never figure out what actually engages the Rockshaft that makes it rotate and lift.

thanks
 

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Are we talking about a 1 series tractor?
 

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The rockshaft snap ring groove on my 1026R is about 1/8" from the end of the rockshaft, judging from your #2 picture it appears that the lift arm is not on the rockshaft all the way and the snap ring is not seated in the snap ring groove. Compare the right side lift arm to the left side and you should see the difference.
 

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I'd have to agree with Vern. In looking at your #2 picture, it doesn't appear that the snap ring is seated in it's groove. I wonder if applying pressure to the opposite side would push the rockshaft over far enough to allow the clip to engage the groove. Or, if maybe the arm pictured needs to be pressed onto the rockshaft further.
 

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There was another thread about this problem...can't find it right now however.
 

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There was another thread about this problem...can't find it right now however.
That would of been mine, I agree the #2 picture doesn't look correct. You can't compare sides they are both different one side has two snap ring grooves in case you decide to add the mechanical lift for a mmm.
 

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That would of been mine, I agree the #2 picture doesn't look correct. You can't compare sides they are both different one side has two snap ring grooves in case you decide to add the mechanical lift for a mmm.
Do you have a link for us?
 

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Here's a picture I had posted in another thread that may help.

This is the left side of the rockshaft. There are two sets of grooves for the snap ring. The inner groove (where the snap ring is currently installed) is used when you do not have a mechanical lift installed. The outer groove is where the snap ring locks when you have a mechanical lift kit installed.



Here is the thread : http://www.greentractortalk.com/forums/sub-compact-utility-tractors-scut/13713-more-deck-problems.html
Here's my actual reply: http://www.greentractortalk.com/forums/sub-compact-utility-tractors-scut/13713-more-deck-problems-3.html#post132914

While the thread was about deck height adjustment, we had gotten side-tracked a bit with a possible snap ring issue late in the thread. On my tractor, there is absolutely no side to side movement of the rockshaft arms (no side to side sliding slop). As I don't have a mechanical lift, I cannot say whether side to side sliding of the rockshaft arms is normal. I actually doubt it is normal and would have to agree that the snap ring is not seating correctly. Could there be some foreign material lodged between one of the rockshaft arm joints that is preventing a tight fit?
 

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I had problems with my snap rings after the dealer installed my new rockshaft in January. Had to make 4 trips to the dealer (about 140 miles round trip) before they got it right. I had them install my 60" mmm this summer with the mechanical lift and low and behold snap ring came off again. I All I can say is these things are a pain in the a** and I hope you the best of luck with yours.
 

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What did the dealer do to resolve the problem
Don't want to hijack the thread but all he did was ask if he should order a new rockshaft. He said he would bring this problem up to deere also. I just ended up putting the snap ring back on and all is good. I think it is a cheesy design how these scut lift arms are held on but I did notice the kubotas are the same way so who knows.
 

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Discussion Starter #15
one other thing, what were you doing with it or had you done when it came off. i was using my rotary cutter, it is pretty heavy at about 500lbs. but i have used it before with no problems
 

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Just a few notes about snap rings. There is a square side and a rounded side to them. You want to install them with the square sided shoulder to the outside so the ring has a better "bite." The other thing I'd like to mention is to make sure they aren't bent, but still flat and perfectly round as they are when new. If they aren't, they'll have a tendency to want to come off because they are deformed. Proper installation tools like snap ring pliers of the correct size will prevent damage when removing or installing them.

Snap rings have been used for a long time with great amounts of success. A root cause failure analysis would hopefully find the real reason of failure. Perhaps it was a bad ring or an improperly machined groove on the rockshaft.
 

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Just a few notes about snap rings. There is a square side and a rounded side to them. You want to install them with the square sided shoulder to the outside so the ring has a better "bite." The other thing I'd like to mention is to make sure they aren't bent, but still flat and perfectly round as they are when new. If they aren't, they'll have a tendency to want to come off because they are deformed. Proper installation tools like snap ring pliers of the correct size will prevent damage when removing or installing them.

Snap rings have been used for a long time with great amounts of success. A root cause failure analysis would hopefully find the real reason of failure. Perhaps it was a bad ring or an improperly machined groove on the rockshaft.
I can't say I knew that or maybe I just didn't remember it. Thanks:thumbup1gif:
IMO, You're lookin pretty smart today. :lol:
 

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I can't say I knew that or maybe I just didn't remember it. Thanks:thumbup1gif:
IMO, You're lookin pretty smart today. :lol:
The day ain't over yet......:lol:
 

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Since this was first posted back in Jan, 14, Deere has said there maybe an issue with the snap ring groove not being deep enough.
Here are the dimensions Measure diameter of snap ring groove. If snap ring groove diameter exceeds 28.6 mm machine groove down to 28.6 mm.
And I would also replace the snap ring. Also make sure you are getting an OEM JD snap ring, not one that "matches" out of a box.
 

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Since this was first posted back in Jan, 14, Deere has said there maybe an issue with the snap ring groove not being deep enough.
Here are the dimensions Measure diameter of snap ring groove. If snap ring groove diameter exceeds 28.6 mm machine groove down to 28.6 mm.
And I would also replace the snap ring. Also make sure you are getting an OEM JD snap ring, not one that "matches" out of a box.
I assume a thin file or dremel tool should be used? Obviously no one is going to remove the shaft and chuck it in a lathe.
 
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