Ford 821

Fordtractor821 · Mar 12, 2017

I have an 821 with 3 point it was in a flood with water over the whole tractor. Drained everything and refilled but the 3 point wont lift. would it be ok to fill the trans with kero and run it alittle to flush out the system then refill with hyd fluid. If I blow air in the dipstick for trans the 3 point lifts and works but very slow. The fluid still is milky and have changed it twice already. What to do?

Larry NCKS · Mar 12, 2017

Dipstick has nothing to do with the transmission. It is hydraulic reservoir only. That tractor has three sumps besides the engine sump.

My guess is that a starting point would be to replace the fluid once again and to bleed the pump by removing the plug on the top front and cranking the tractor. I usually pull the coil wire so it can't start. Some allow it to start. I'd do this until you get clear fluid out this port, even if that means adding more to the reservoir in the process.

Fordtractor821 · Mar 13, 2017

(quoted from post at 19:50:00 03/12/17)
Dipstick has nothing to do with the transmission. It is hydraulic reservoir only. That tractor has three sumps besides the engine sump.

My guess is that a starting point would be to replace the fluid once again and to bleed the pump by removing the plug on the top front and cranking the tractor. I usually pull the coil wire so it can't start. Some allow it to start. I'd do this until you get clear fluid out this port, even if that means adding more to the reservoir in the process.

So the rear oil doesn't mix with the trans and the trans oil doesn't mix with the hyd oil. Then why when I put compressed air in the dip stick does the 3 point raise? It will raise and lower but slow and jerky but only for that day next day nothing till I put air in again. Just trying to understand, I will try refilling with hyd fluid. What is the correct fluid for rear, trans and hyd? Thanks for your help.

Larry NCKS · Mar 13, 2017

Original transmission and rear end fluid was 80 or 90 weight gear grease. I'd go with 80W - 90 while many would recommend the 134 - D UTF which is much lighter. Hydraulic section originally was lighter weight Current spec on hydraulic oil is M2C - 134 - D. Find something that meets or exceeds this spec.

Once again, the dipstick is part of the hydraulic reservoir. It has nothing to do with the transmission or rear end! If you get enough pressure in the hydraulic section, you force oil into the pump through the pickup (suction) tube. Typical slow and/or jerky lift action means the oil in the pump has air trapped in the system.

Unless seals in the transmission/ rear end or hydraulic tubes through the transmission belly are bad; there is no intermingling of the fluids in the transmission, hydraulics and rear end.

You're welcome!

souNdguy · Mar 13, 2017

I have a 541 that was in a flood at some point..

I found sand in the bottom of most castings.

I ran a combination of transmission fluid, diesel and alcohol in the hyds section as a flush, strained thru some tshirts and
reused.

The alcohol 'mops' up the water, the diesel thins gummy emulsified oil so it can flow out and find a new home on the tshirt,
and the tranny fluid provides a little lubrication, and some detergents to further suspend gunk and get it out during drains.

This is of course after manually cleaning the sumps as much as possible. PS.. a pressure washer on low makes a great spray
job on a gear case and sump.. then just flush afterwards with the mix I used to get water out.

Fordtractor821 · Mar 13, 2017

Thanks for the information. No time for tractor today getting ready for snow storm. Plowing snow tomorrow. Thanks.

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