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Allis Chalmers Discussion Forum
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Sticking Hyd. Cylinder on an Allis C

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Jim in NC

04-07-2008 05:31:39




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My C has a 5' belly mower on it. Often when I attempt to lower the mower after raising it, it will only go down if I get off the tractor and push it down with my weight. The cylinder dies not seem to release. Any suggestions are appreciated.




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DARDAN

04-09-2008 23:26:37




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Jim in NC, 04-07-2008 05:31:39  
I would check for binding of the pivots and linkage, they should move freely with the mower unhooked and the cylinder unpinned.
Check that the cylider rod is not bent.
IF I remember right, there is a thumb screw adjustment on the control linkage to the handle that varies the speed of lowering the implement. If the screw is adjusted to realy slow down lowering, that may be the problem.
Good luck.

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Ted in NE-OH

04-07-2008 20:23:18




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Jim in NC, 04-07-2008 05:31:39  
Cyclinder packing nut too tight?



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Texas Denny

04-07-2008 14:07:14




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Jim in NC, 04-07-2008 05:31:39  
Jim, I've thought about this off and on for a couple of hours. The only thing that I think might cause this is air in your hydraulic system. The first thing I would check is the level of fluid in the rear axle. If it is low, the pump might pump air and fluid into the cylinder. When releasing the cylinder on a light load, it might not go down.

Another possibility is the type of oil in your rear axle. The fluid should be 30W non detergent. Some use regular hydraulic fluid. Motor oil that contains detergent may foam in the system giving the same symptoms as air in the system.

It is messy but, if you aren't able to find anything else wrong, drain all the fluid from the rear axle (the rear axle and transmission share the same reservoir with the hydraulics). It contains 6 quarts of oil. Replace it with non detergent 30W oil. About half of the auto stores in my area carry non detergent oil in 30W. If you can't find it, use a good grade of hydraulic fluid which is more like 20W. If you have leaks, they will be worse with the hydraulic oil.

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Jim in NC

04-07-2008 17:42:36




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Texas Denny, 04-07-2008 14:07:14  
The oil level was full all last summer and good when I checked it last fall. The oil is clean, but I do not know what kind or weight it is. I will probably start mowin' this week, and will check these things when I get it out. How' bout a couple of cement blocks on it for weight. I know it's not original equipment, but.... Just askin!



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Texas Denny

04-07-2008 19:03:39




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Jim in NC, 04-07-2008 17:42:36  
Blocks might do the trick. Also check the linkage - something may be causing binding. Over the winter something may have gotten set on it that restricts movement.

Your problem is somewhat unusual. The usual complaint is that the lift won't stay up!



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Jim in NC

04-07-2008 19:24:55




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 Re: Sticking Hyd. Cylinder on an Allis C in reply to Texas Denny, 04-07-2008 19:03:39  
For my stuff to be normal would be unusual! I bought this thing last spring and the problem came with the tractor. The previous owner told me about it. It is more an inconvience that anything. It is a good mower though. Cheaper to buy, more power and weight than one of those throw away mowers that can be bought ennywhere. And, the lift does stay up pretty good. Thanks for your help and the good words.

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