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External (auxiliary) hydraulics for a TO-20

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Scott

10-19-2001 11:33:26




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Same question Red Rider asks 9 posts below! On a TO-20, does anybody know of a way to plumb off the internal pump with a selector valve to divert the hydraulic pressure off the internal ram and out to a two way valve for other applications? How does this work?




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Jim W

10-28-2001 06:24:00




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 Re: External (auxiliary) hydraulics for a TO-20 in reply to Scott, 10-19-2001 11:33:26  
I have a lift cover all apartfor refurbishment here and a way to do this has just struck me:
First - I need to correct myself on my previous message - the tube carrying the hydraulic fluid from the pump up to the lift cover is on the right, not the left (as you look at the tractor from the back).
If you look at the left and right plugs on the lift cover, the channel carrying the fluid to the cylinder runs across between them. You could carefully drill down from above, exactly centred over that channel, and between the vertical tube and the point where the fluid enters the cylinder (which is in the middle). The idea is to put in a third plug, so drill it and tap it with a 3/8" pipe thread, and put in a plug to block the passageway. With the passageway blocked between the right side and the centre, the hydraulic fluid has nowhere to go. The right hand plug will now be the point where you can get pressure. From there you can route the fluid through your diverter valve either to your external implement, or back into the left hand plug, when it will operate your rear lift arms as normal. This way you don't have to chain them down when you are using something else.
Regards,
Jim

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Red Rider

10-31-2001 19:27:03




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 Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to Jim W, 10-28-2001 06:24:00  
Jim I understand what your saying but you didn't mention what I would do for the return hydraulic fluid. If I come out of the right hand plug to my diverter valve, I will divert hydraulic pressure either to my two way open center valve or back into the left had plug to operate the three point lift. I will also need to have a return for my two way valve when its in the neutral position. why couldn't you just drill and tap a 3/8 hole through the cast housing into the hydraulic reservor?

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stevie_alc

10-28-2001 09:32:39




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 Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to Jim W, 10-28-2001 06:24:00  
Jim W.

I am going to jump in here with a comment. I have been thinking along the same line. That is plugging the passagway between the pump and cylinder that runs vertical under the seat. Now what happens to oil pressure if you have your lift arms raised. Will you be able to divert oil from the pump thru you diverter valve to the loader and still have oil presure to the loader. An interesting string to follow. Let us know if it works. And I may try something like that this winter.

Be careful and take care.
stevie

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stevie

10-28-2001 09:51:32




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 Re: Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to stevie_alc, 10-28-2001 09:32:39  
I goofed,I am thinkig of the horizontal line that runs across under the seat. Am think of using an open center control valve for the loader with the return line going to the tap on the upper right rear of the transmission housing.

stevie



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teadave

10-21-2001 06:38:04




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 Re: External (auxiliary) hydraulics for a TO-20 in reply to Scott, 10-19-2001 11:33:26  
there is a way, but it involves removing the top cover & a fair bit of work. the method came from a guy on the ford n board. if anyone wants it i will email it to them.


teadave



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Shane Hodgetts

12-19-2001 12:53:02




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 Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to teadave, 10-21-2001 06:38:04  
TEADAVE!!! Could you please email me those instructions? I have a TE-A20 and am about to attempt to put a loader on it and would really like some guidance.
Thanks!

Shane



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Jim W

10-19-2001 14:35:07




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 Re: External (auxiliary) hydraulics for a TO-20 in reply to Scott, 10-19-2001 11:33:26  
This will be quite difficult to do due to the layout of the hydraulic system. When you bolt the pump up from underneath, its output lines up with a vertical tube on the left side inside the transmission tunnel. Now note the two plugs on your lift cover. There is a passageway for the oil right through from one to the other i.e. from right to left, and the plugs close off the ends of that passageway. When you bolt down the lift cover, there is a hole in the bottom of this passageway that lines up with the top of the vertical tube. Finally, inside the lift cover there is one more hole in the bottom of the passageway that lines up with the lift cylinder. When you put it all together, the pathway for the oil then is out of the pump, up the tube, turn right into the passageway, and down into the lift cylinder, which moves the piston.
The problem is that there is no way to divert the oil from going up the tube without going inside the tunnel. If you tap off at one of the plugs, you will get pressure alright but it will still be applied to the lift cylinder. The only way I can think of to do this is to cut the tube, and replace it with two separate sections that exit the tunnel someplace, like through the round cover that has the pto engagement lever. Then your diverter valve could have the oil going either into the top half of the tube, or the external equipment. Even then you'd have problems getting the top and bottom ends of the tube to stay put, as the normal procedure is to flare both ends to keep it in place.

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Jim W

10-19-2001 15:00:34




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 Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to Jim W, 10-19-2001 14:35:07  
Hey wait a minute, maybe there is a way after all. There is also an outlet plug on one of the bottom corners of the pump. If you could perfectly block the vertical tube somehow, then you could take the output from the bottom plug, and when you want to use the lift arms, route the oil from the diverter valve back IN to one of the two top plugs on the lift cover.



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Scott

10-22-2001 07:54:15




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 Re: Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to Jim W, 10-19-2001 15:00:34  
Thank you for your detailed suggestions! It looks like this project could turn into a real head-scratcher. I gotta do everything the hard way!



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stevie

10-20-2001 20:38:33




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 Re: Re: Re: External (auxiliary) hydraulics for a TO-20 in reply to Jim W, 10-19-2001 15:00:34  
I am using the internal hydraulics on my TO-30 to operate a loader. I have the lift arms chained down and a fitting in one of the outlets from the pump. Then I installed a ball valve in the line to the loader so power can be shut off to the loader so I can use the three point. You have to have the lift arms chained down because when they come up you lose your hydraulic pressure. Mabe someday when the wife gets enough money I can get a front mounted pump that is driven off the engine.

stevie

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