Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors


SunStar PS cylinder rebuild

Recommended Posts


Saw this on another tractor forum --thought I would give it a try since I have two cylinders laying around

that leak and a new one is priced at $600 sm00 I have all done except the welding and I don't trust my welding so

I'm waiting for my welding buddy to return to town. BTW I found a used cylinder on Ebay for $150 that should be here next week--hope it doesn't leak--the pictures are self explanatory - I got the O rings from my local Hydraulic supply for no chargesm03  the two on top are new and the bottom ones are the old ones and you can see why the cylinder was leaking - the bottom cyl is the original one that is 29 years old and was replaced about 15 years ago with the top one which has been leaking for a few months. Did the cut with a Metabo 6" grinder with a cutoff wheel. Only thing I would do different is make the cut about a 1/4" toward the rod end of the cyl. I cut in the middle of the weld and that actually cut into the solid end piece where the fitting screws in. Will report back when I finish. 101_2016.JPG    101_2014.JPG101_2015.JPG101_2017.JPG

  • Like 1

Share this post

Link to post
Share on other sites

Bill: Do you have any pics of the rod assembly by it self ...out of the housing? Would like to see what the piston looks like. Also are there seals on the end where the rod exits the cylinder or is the what you are showing. They look like what would be on the piston. I just got done rebuilding a 3 inch by 30 inch stroke cylinder on my backhoe...which I have mounted on a Ford 861 tractor. Bit of a story but the place I took it to wanted over $500 to replace the rod and seals!!! The rod looked fine to me. I ended up picking it up and going to a REAL hydraulic shop and got all the seals and the shop guy looked at it and said it looked fine. He threw it into one huge lathe and polished it..no charge! Got it back together and it's working great. Oh .. he quoted me $165 for a new chrome rod ,threaded on the one end and my old end welded on the new rod. But he said you won't have any problems with the one I had. 

Never liked the fact that these cylinders are welded.


Share this post

Link to post
Share on other sites

Harry--here are a couple of pictures of the piston with the O ring sandwiched between two plastic washers--

as for the seal at the exit end of the cyl those are the O ring and small plastic washer in the first set of pictures-

there is also a wiper at the exit but it was not damaged and the guy at the hydraulic shop said it would be OK.101_2019.JPG101_2021.JPG

Share this post

Link to post
Share on other sites

Finished up with the cylinder rebuild along with new spindle and bushings on the SunStar--turned out very good with no leaks--

I also have another cylinder from ebay and another to be rebuilt so I should be good for awhile. 101_2026.JPG101_2027.JPG101_2029.JPG

Share this post

Link to post
Share on other sites

I'm a bit surprised the hydraulic shop didn't have you upgrade to something more like a square section synthetic seal for the piston. The cylinder on my old John Deere crawler originally had O-rings. I replaced them with better ones that had a square cross-section along with what I think is a Teflon layer around it.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Who's Online (See full list)

    There are no registered users currently online

  • Today's Birthdays

    1. gwiseman
      (66 years old)
  • Recent Status Updates

    • Paul M.Murphy

      Paul M.Murphy

      Hello glad I got on this site. I hope to upload a couple of photos of my Simplicity Broadmoor 
      Model 707 Tractor. I have replaced all the belts on it and installed a new ignition switch.
      Have a mower deck which was in poor shape , repaced a couple of bushings and welded the
      deck where there was some holes. The tractor and mower deck came from a friend and the 
      mower deck metal was getting pretty thin. Some new metal was put in it and we also undercoated the underside of the deck. This was done by my friend Greg Toulman.
      I have not put the mower deck on the tractor yet, waiting for Greg to come home and give me a hand. Can you please tell me if there is a manual for the mower deck and where I could get one.
      I would also like to get some moon wheel discs as well.
      I will try and down load some photos of the tractor when my wife shows me how to. 
      I really love driving this tractor and also how well it is made compare today's tractors, especially the flexible rear end and the rollers.
      Tell the next time 
      · 8 replies
    • jbrooks

      jbrooks  »  Talntedmrgreen

      folowing  this from a link at the downloads.  I just rescued an AC 920 with the lambodini diesel. I can' t download  yet .  Where did you find the PDF copy you posted. . I would like to figure out how to adjust the injection pump. 
      I assume it's a bosche, correct
      · 0 replies
  • Adverts