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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Hydraulics quit working

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ukcatfan

04-15-2018 07:22:44




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I was using my box the other day and my hydraulics just bottomed out and quit working, brought my tractor to a halt. Pulled the inspection plate and started the tractor. I don't see anything going on in there around the pump. My question is, how does the control rod attach to the pump control? Mine just kind of flops around down there. I can move the pump control in and out by hand but it doesn't appear that the touch control is.

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JMOR

05-01-2018 07:02:40




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to seedon't feel too bad, as that exhaust valve construction is not well understood by many. Glad you got it fixed.



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ukcatfan

05-01-2018 10:42:13




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 Re: Hydraulics quit working in reply to JMOR, 05-01-2018 07:02:40  
I read in the old training manual that they fixed this freezing problem with a valve in a spiral configuration but I can't find anything else about it. At least I'll know where to start looking if there is a next time.



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JMOR

04-30-2018 13:03:39




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to seeyou can not push the exhaust valve in?



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ukcatfan

05-01-2018 05:08:50




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 Re: Hydraulics quit working in reply to JMOR, 04-30-2018 13:03:39  
It was the exhaust spool, it was frozen. I didn't realize how the spring and pin worked. I didn't realize the spool was supposed to move in and out like that. I started to knock the bushing out and it came loose, well crap. Now I know. I feel stupid but I learned from it. Thanks for putting up with my rambling. Hopefully I can pay it forward someday.



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ukcatfan

04-30-2018 13:16:19




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 Re: Hydraulics quit working in reply to JMOR, 04-30-2018 13:03:39  
I'll post some pics when I get home and explain further. Sitting on a bench out of the tractor, out is the only way it will allow me to move. It's almost like the pin in the exhaust side is opposite of how it should be, very weird.



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JMOR

04-30-2018 12:32:41




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to seeWhy do you say, 'exhaust valve spring problem"? I said that it is the intake valve spring (spring behind intake valve ) that pushes it out. So, to me it looks a lot more like intake valve spring problem, if it is not pushed out when unconstrained.



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ukcatfan

04-30-2018 12:38:35




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 Re: Hydraulics quit working in reply to JMOR, 04-30-2018 12:32:41  
The travel of the intake spool is not enough for the taper to open the ports. The exhaust pin/spring is what is keeping this from happening. This is on a bench working it by hand.



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JMOR

04-30-2018 12:06:39




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to seeThe intake loop as shown in the posted picture from the manual is supposed to touch housing at full lift command. "It will only let me pull the intake valve out" is all wrong. If left free, it will be pushed out rather forcefully be the spring behind it, resting in the dump/lower position.



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ukcatfan

04-30-2018 12:19:24




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 Re: Hydraulics quit working in reply to JMOR, 04-30-2018 12:06:39  
Then I have an exhaust valve spring problem. It seems to be jacked up. I guess you have to press these out or hit it with a punch?



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Caryc

04-30-2018 11:31:24




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
This is a pretty good DVD on repairing the Fords hydraulic system.

https://www.amazon.com/Hydraulic-Repair-Ford-Ferguson-Tractors/dp/B008QA77HU/ref=sr_1_5?ie=UTF8&qid=1525112032&sr=8-5&keywords=hydraulic+repair+for+ford+and+ferguson+tractors



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ukcatfan

04-30-2018 09:37:54




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Ok, I rebuilt everything in the pump, except the intake and exhaust valves and bushings. Still didn"t work. I believe something is going on with my exhaust valve. Does the intake spool suppose to push in to go up or what? I can only pull mine out, seems backwards. The taper on the spool should open the port correct?



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Caryc

04-15-2018 11:47:46




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to see

I was driving my 8N up to it's parking place when the box blade suddenly dropped. Exactly like your symptoms. I pulled the top cover off and discovered that bent control arm. The pin in the control arm had also slipped completely off the cam and was on the side of it. It was very worn. I put a straight replacement control arm in it and replaced the pin with a longer one. The linkage was also a little sloppy with side play and I fixed that with a washer as a spacer. Works good now.
I'd be more inclined to pull your top cover and have a look than the pump.

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ukcatfan

04-30-2018 10:31:09




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 Re: Hydraulics quit working in reply to Caryc, 04-15-2018 11:47:46  
I need somebody with some experience to tell me how the intake and dump valves work. Every pic I see, the valve control is touching or almost touching the pump housing on the exhaust side. Mine does not and it will only let me pull the intake spool out which looks to me like that does nothing as far as the taper on the spool opening the port in the bushing. Looks to me like when you raise the lift the spool should move in instead of out. I'm going to try and remove the dump assembly.

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ukcatfan

04-15-2018 11:26:38




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
It's not bent. I've drained the oil, looks like the picture. There is some slop and it moves up and down slightly but due to the manner in which it quit, I believe my problem lies deeper. Just going to pull the pump, the fluid is very nasty anyway.



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Caryc

04-15-2018 10:34:31




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Here's an example of how much a control rod can get bent. Yes, they're supposed to be straight.



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HCooke

04-15-2018 10:25:07




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  

Picture is from the FO4 manual. Control rod fits into a rocker which then opens and closes the intake and exhaust valves. If the control rod is flopping around down there, you are going to have to drain the fluid so you see what happened.



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Caryc

04-15-2018 10:11:32




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Actually, you can see that picture in this post.

http://forums.yesterdaystractors.com/viewtopic.php?t=1350259&highlight=control+rod



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Caryc

04-15-2018 10:08:52




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Quoting Removed, click Modern View to see

The control rod has a ball end on it. This ball sits in a cupped socket on the pump control. Someone here has a pretty good picture of that. I'm sure he will be along soon to post it.
When you have that side cover off, you should be able to just reach in there and feel if the end of the control rod is still in the cup at the bottom. Then move your touch control and feel if the control rod is actually moving the pump control in and out. Do this with the tractor not running or course.
Sometimes control rods get bent or even broken.

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ukcatfan

04-15-2018 07:25:43




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 Re: Hydraulics quit working in reply to ukcatfan, 04-15-2018 07:22:44  
Sorry, it's a 51 8N.



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