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140 Hydraulics not working

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10-01-2019 08:29:57

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I recently purchased a 1963 140. I rebuilt the engine and it runs great. I decided to tackle the hydraulic control box. I purchased a rebuild kit and replaced the seals and gaskets.
I filled it with 30W non-detergent oil and tried it out. No luck.
Last night I took it back apart looking for obvious problems.
The only possible issues I saw were very small nicks in the valves. I filed out what I could so that the parts moved pretty freely.
I reassembled and still no movement.

My thought is that possibly the pump may have a problem. When I rebuilt the engine and started it, the hydraulic pump was on and turning without any oil because I had removed the hydraulic control box when I disassembled the tractor.

The pump is pumping oil because it had oil pour out when I took it off the tractor last night. Could the pump be pumping but be so weak that it wouldn't move the pistons?

Any thoughts?

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10-05-2019 04:05:50

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 Re: 140 Hydraulics not working in reply to Altman, 10-01-2019 08:29:57  
I spoke to a gentleman from our church that worked on 140s a long time ago and he recommended checking the pump. He thinks it may be sucking in air.

I will update what I find.

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10-01-2019 12:34:58

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 Re: 140 Hydraulics not working in reply to Altman, 10-01-2019 08:29:57  
I tried to prime by putting the tractor on a down grade but it didn't work. I did not include that in my post.

I think the fluid is getting to the pump because when I took it off last night there was fluid in the pump.

I am not sure how to pressurize the tank at the fill plug.

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10-01-2019 13:40:47

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 Re: 140 Hydraulics not working in reply to Altman, 10-01-2019 12:34:58  
With an air hose and a rag to partially seal the hose to the opening. Or drill and tap a threaded schrader valve into the cap. Jim

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10-01-2019 10:26:28

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 Re: 140 Hydraulics not working in reply to Altman, 10-01-2019 08:29:57  
Priming is often the answer. Drive it into a ditch with the front 16 inches or so lower than the back, then work the levers. If no joy, put about 15psi (no more) into the reservoir filler plug to force prime it.
The above assumes the system is OK but not primed.
If no joy, the relief valve could be stuck open making no pressure. Another issue might be the pump drive gear could be sheared on the shaft, and not turning. Good luck. Jim

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