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Ford 120 Hydro transmission/differential question


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#1 joshtiffany OFFLINE  

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Posted September 26, 2011 - 09:54 AM

Is there a separate drain for the differential and hydro transmission? I see the drain located on the "diff" but no separate for Hydro. Do they use the same? I have both the Ford 120 manual and the Jacobsen but it is not clear to me. Also, any recomendations on fluid/fluids. Thanks, JT

#2 KennyP ONLINE  

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Posted September 26, 2011 - 07:47 PM

Josh, as far as I know there is only one drain. You refill with Hydro fluid.
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#3 olcowhand ONLINE  

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Posted September 26, 2011 - 07:49 PM

Kenny's right, drain the diff & that is the same hydro fluid. Replace with Dexron III.
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#4 EricFromPa ONLINE  

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Posted September 27, 2011 - 05:29 PM

Is it an old 60s Ford GT 120 or a 70-80s LGT120?

If it's the older 60s model it has gear oil in the bottom case and it calls for Type A in the pump reservoir under the seat.You may have to take the seat pan assembly off and take the reservoir cover off.I have an old Ford 120/Jacobsen 1200 super chief down at the farm.We've looked all over the thing for a drain plug for the hydro unit and couldn't find it.

Ended up taking the seat pan off and the rear reservoir cover.The cover was leaking on ours anyway.The reservoir is a square Aluminum box about (8 inches by 5 inches) with cooling fins that sits directly under the seat.

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#5 KennyP ONLINE  

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Posted September 27, 2011 - 05:44 PM

Thanks Eric. Good info to know about these older tractors.

#6 olcowhand ONLINE  

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Posted September 27, 2011 - 05:51 PM

Yes, I may stand corrected by Eric. I forgot about the older version.

#7 EricFromPa ONLINE  

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Posted September 27, 2011 - 07:52 PM

Here's the breakdown for the hydro assembly.I still can't find a drain plug for it.:wallbanging:

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  • hydro.jpg
  • hydro1.jpg

Edited by EricFromPa, September 27, 2011 - 07:59 PM.

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#8 olcowhand ONLINE  

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Posted September 27, 2011 - 09:21 PM

Here's the breakdown for the hydro assembly.I still can't find a drain plug for it.:wallbanging:


That looks very similar to the Massey MF12H hydro. In the upper left of the schematic....#52 would be the drain on the Massey, but that plate would be on the bottom on the MF. The pic orientation of the schematic...is it like it actually in the same orientation on the tractor?

#9 joshtiffany OFFLINE  

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Posted September 28, 2011 - 07:07 AM

Eric: I am still not clear on the Hydro portion, Is there no drain? Once I take off hyrdo cover would I have to manually remove fluid from top?

Thx,

JT

#10 KennyP ONLINE  

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Posted September 28, 2011 - 07:45 AM

I may be way off here, but looking in the owners manual I can't find anything that says where to drain the Hydro. But I did find this pic and it shows an 'oil level plug' in the lower left corner. Could this be the drain and is misidentified?



Chief.jpg

#11 EricFromPa ONLINE  

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Posted September 28, 2011 - 04:46 PM

Kenny that little gear box is for the gear driven Ford 100.Sence it is an inverted Peerless transaxle,it needs a small gear box to reverse the input rotation.It doesn't tell you where or how to drain the hydro pump in any of the manuals.I've looked through a dozen or so service manuals and parts manuals.

Joshtiffany The hydro filter is inside the reservoir,so if you are planning on cleaning it you're going to have to take the cover off.Our 120 is down at the farm(15 miles away) and when i changed fluids,I took the cover off and stuck a funnel with a hose attached to it in the filter fitting and flushed the whole system out.It was a messy job but it has fresh,unburnt,clean fluid in it now.

I couldn't find a replacement filter filament so I just soaked the old one in kerosine and blew it out with air.

WOW I see in the parts list 2 small plugs on the bottom of the pump housing,you might get it to drain out using these.They are on the bottom of the pump housing and on the right side when sitting on the seat.I'll give that a shot if I ever need to do ours again.

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Edited by EricFromPa, September 28, 2011 - 04:58 PM.

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#12 joshtiffany OFFLINE  

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Posted September 28, 2011 - 04:48 PM

I may be way off here, but looking in the owners manual I can't find anything that says where to drain the Hydro. But I did find this pic and it shows an 'oil level plug' in the lower left corner. Could this be the drain and is misidentified?



[ATTACH=CONFIG]21860[/ATTACH]


Kenny:

I see that in both my Jacobsen and the Ford 120 manual but the corresponding diagram is not referenced to any wording.

At least none that I can find.

JT

#13 KennyP ONLINE  

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Posted September 28, 2011 - 05:57 PM

Not having one in real life can make it frustrating to help. Eric, thanks! Just a shot in the dark.
Josh, how close does the posted parts diagram match your tractor? Can you get a pic or two so we can orientate with your tractor?

#14 EricFromPa ONLINE  

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Posted September 28, 2011 - 06:27 PM

Is it the 120 in your gallery?

My Ford 120 - Garden Tractor Talk Gallery

#15 KennyP ONLINE  

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Posted September 28, 2011 - 06:34 PM

Is it the 120 in your gallery?

My Ford 120 - Garden Tractor Talk Gallery


If it is, I can see the hydro hiding behind the rear tire, kinda like the pic I posted.
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