Donnell hydraulic cylinder rebuild
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=181264
Printed Date: 19 Jul 2025 at 5:21pm
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Topic: Donnell hydraulic cylinder rebuild
Posted By: Ssimmons
Subject: Donnell hydraulic cylinder rebuild
Date Posted: 18 Jun 2021 at 6:21pm
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I am rebuilding a Donnell hydraulic cylinder for the loader on my WD 45. I have removed the packing nut and pulled the ram out as far as I can. There are some seals etc that came out, but the ram will not come clear out. Seems to have hit a hard stop. Should it come all the way out? Any suggestions would be appreciated! Thanks! |
Replies:
Posted By: MACK
Date Posted: 18 Jun 2021 at 9:13pm
| Will not come out without removing snapring. Dig packing out and replace. MACK |
Posted By: Ssimmons
Date Posted: 02 Jul 2021 at 3:27pm
| Just the packing on top, or is there packing on the bottom of the ram as well? |
Posted By: steve(ill)
Date Posted: 02 Jul 2021 at 5:50pm
Scott, i have never disassemble that Brand of cylinder... but basically you should have a PACKING/ O ring set on the INSIDE the HEAD to keep the oil from leaking around the rod to head fitting... You might have a set of seals on the OUTSIDE of the HEAD to seal the head to the cylinder tube... Then you have a THIRD set of seals on the PISTON to seal it to the walls of the cylinder... When you remove the HEAD, you will see the OUTER seals that seal it to the cylinder.. You need to remove the rod from the cylinder to see the PISTON seals, then pull the rod out off the HEAD to see the INTERNAL ROD seals. ------------- Like them all, but love the "B"s. |
Posted By: MACK
Date Posted: 02 Jul 2021 at 8:57pm
| Most, only a snapring on bottom and packing at top. To get rod out, unscrew cylinder and hope it don't leak at threads when screwed back together. MACK |
Posted By: Jim.ME
Date Posted: 02 Jul 2021 at 9:31pm
| You don't say what brand/model loader or if it is a single or double acting cylinder. Single acting cylinders were common on the old loaders and as Mack said those often only had a snap ring to keep the rod from coming out. There was no piston on the rod end, just a packing where the rod exited the barrel. I agree with Mack based on guessing at what the loader and cylinder on your WD would be ( High pressure low volume). A picture might help clear things up. |