MF135 lift piston

rockepg

Member
Hey guys quick question. I have a replacement piston for the hydraulic lift cylinder and its different that original. There is an o-ring and a fiber ring. How do these assemble? Doesn't looks like there is enough room for them to sit side by side so assuming one goes on top of the other.
 
It's a PTFE seal, you can warm it up in oil to make it somewhat pliable to install. Once out of the oil you will need to work quick to get on so have everything clean, and ready. After it is on a piston ring compressor can be used to get it back into shape while it cools. If you don't feel confident in putting on a hydraulic shop can install it for a few $, or free since you have all the parts.
 
Ah ok was wondering about that. Probably what i'll do is have the cylinder handy and squeeze it all together and let the cylinder hold it to final shape.
 
(quoted from post at 17:20:49 10/28/16) O-ring on the bottom.

I just replaced the piston in my 8N with the NAA piston. The instructions said to put on the leather ring first, then the rubber O ring. So after doing this, when installing the piston, the O ring went into the cylinder before the leather ring.

So, technically my O ring was on the top. Is this different just because it's in an 8N?
 
The 8N/NAA piston seal is different.
This a MF piston with the o-ring under the PTFE seal.
42001.jpg
 
(quoted from post at 17:25:09 10/29/16) The 8N/NAA piston seal is different.
This a MF piston with the o-ring under the PTFE seal.
42001.jpg

Thanks, I was hoping I didn't screw it up. :wink:
 
Interesting your is white. The one i have is black and feels more like carbon fiber than teflon. Will give it a try this morning and see what happens.
 
Yes, that is the correct way to fit the rings on the new style piston. I just replaced mine a few years ago. Here is a pic of the old style
rings. Make sure that you do not lose the roller pin as you take it out. I put a wire around it first so that it does not fall into the
well. Good luck.
DSC05959_zps7ff64796.jpg

DSC05947_zpscd548ed7.jpg

DSC05952_zps524be8e8.jpg
 
Ok got it installed. Heated it up in some oil. Took two tries and needed the wifes help to stretch it before it cooled to much. Used the cylinder to evenly push the seal down into the groove and then a ring compressor to squeeze it back down. Installed it into the cylinder while it was still warm and has a nice tight fit. Got the seal started and removed the compressor to make sure things were lining up before pushing it in all the way. Did not leave any shaving in the cylinder so seems it's in there straight and even.
Now the new lift shaft and bushings is a whole different story. Guess i expected the bushing to be sized correctly for the new shaft. Boy was i wrong :/
 
You will have to hone, or ream the lift shaft bushings, and on any other bushings you replace on the tractor. It's like taxes, you know you are going to have to pay them every year.
 
Taxes and death are the only constants in this world! Started to hone the bushing already figuring that was only option. One sides needs much more than the other but i'll get there. Just lots of 4 letter words :) Something about an engineer, a dark alley and a rubber hose..
 

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