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Hydraulic piston damaged

B

Boskomj

New User
Per the shop manual, I removed the top cover of the hydraulics. The lift arms have been slowing when raised for a few months until they finally barely lifted the blade while blading snow
yesterday. I opened the fluid fill and peeked inside - I noticed the leather piston ring hanging from the rod. It seemed to have slipped out its slot. Reading the manual, it seems the A-type
piston had this problem? With the top off, I do have the A-piston. When I removed the housing and removed the piston I noticed it appears to have been dented -- The rod doesn't connect to
the piston and so appears that the two slammed together. I have the new piston and gaskets ordered - but I fear this is a symptom, not the cause. Any thoughts as to what might have caused
the rod and piston to slam together hard enough to cause this damage?

Thanks, -Mike



If I knew how to post a picture, I would.
 
Hope this worked - picture of the piston attached.


cvphoto142623.jpg
 
Yes, the rod isn't connected to the piston other than via the force of gravity pushing down on the external lift arms. It's possible that someone lifted the external lift arms which caused the rod to pull out of the cup in the end of the piston where it should normally sit and ended up off to the side, or more likely, down toward the bottom, edge of the piston, and the next time the lift was used on a heavy implement it dented the edge of the piston.
 
The connecting shaft should not have caused that damage as it has a ball on the end to slide over the lip of the piston skirt 360 degrees. Is your shaft damaged on the ball end that engages the piston?
 
The shaft and ball end look to be in perfect condition, very smooth. The chamber wall too, clean and smooth. I've run the shaft in when the piston is installed and yes, it slips over the edge of
the piston. I'm really not sure what would have caused it but it sure looks like it had been hit with a blunt object.



Maybe was like this before I owned and and the prior owner fixed something and didn't change out the piston - no idea - and I can't figure out what would/could have caused this.
 
Slight possibilty lift arms where raised hi enough for dog bone to come out of cyl, Then made lift with touch control lever which pushed piston to far out then broke dog bone or pin in rocker then PO replaced dog bone or pin with out looking at piston. Have seen on Ns several times. Last one was on a 3000. Arms down but wood not raise.
 
Hmm, that would explain it. Quite possible. When the parts arrive, I'll feel better about getting it put back together, closing er up, and seeing what happens. Hoping for the best.
That top cover is far heavier than I had imagined - it's going to be a fun one to get back on the tractor cleanly without a hoist of some sort. Here's to not breaking anything (fingers included).
Thanks all !
Mike
 

My guess.

Your lower lift arms are hitting the tires that causes the lift arms to be lifted then they slam down. Let see a pix of the check chains are they to long and does it have oversized tires. Do you use stabilizer bars ?

I try my best to stay away from leather backers this This what I use for a -330 O-ring

5288T359
 
I think you should drain the rear end and see what pieces are down there. I doubt very much that dent was caused by the link. Thats what the chamfer on the inside of the piston is for .... to guide the link back into the socket. Whatever happened to that piston happened more than once... and the mushrooming on the edge of the piston, something was banging around in there. I also dont understand how, with a piston/cylinder clearance of a few thousandths, how that leather ring got out of the piston groove intact enough to hang on the link.
 
(quoted from post at 13:10:30 12/12/22) I think you should drain the rear end and see what pieces are down there. I doubt very much that dent was caused by the link. Thats what the chamfer on the inside of the piston is for .... to guide the link back into the socket. Whatever happened to that piston happened more than once... and the mushrooming on the edge of the piston, something was banging around in there. I also dont understand how, with a piston/cylinder clearance of a few thousandths, how that leather ring got out of the piston groove intact enough to hang on the link.
Click to expand...

Thanks Fritz - that's what I'm thinking too. On the leather ring escaping its slot though, in the shop manual something was mentioned about the ring slot being moved on the B-type pistons (this one is an A-type) for what I read as a preventative measure for this similar issue. (maybe confirmation bias though).

As for the mushrooming on the piston, I can't figure it out either except for what the other folks mentioned here. This tractor hasn't seen keeper chains on the arms since I've owned it - so it very well could have been kicked up by the tires and allowing the piston to slip out further than it should - then getting wacked by the rod. Maybe. Regardles, I'll be adding a set of chains too. Didn't even think they had more function than to just keep the arms from flopping around.'

Too, I have the hydraulic fluid completely drained from the chamber - no metal pieces at all in the bottom. This must have happened before and was never fixed (as was mentioned by someone earlier). I think you all nailed it here.

This post was edited by Boskomj on 12/14/2022 at 11:15 am.
 
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