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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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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  
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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

04-15-2018 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  
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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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