Country Boy

What you have there is an early hydrostatic drive system. There is a pump being driven by a shaft from the engine and you control the output of that pump with the forward/reverse lever. That lever moves the swash plate in the pump, which in turn varies the output and direction of fluid flow in the pump. That pump is hooked to a final drive assembly (rear axle assembly) that is powered by a hydraulic motor. The motor turns the input of the rear axle, and the axle spins the tires. What is happening while you go downhill is that the rear axle is starting to spin the hydraulic motor faster than what the hydraulic fluid coming in can spin it. That creates excess pressure on the output side of the pump and low pressure on the input side. By putting it slightly into reverse, you are retarding the flow of hydraulic fluid from the output side of the hydraulic motor so it can't freewheel like it currently does. The problem is caused by the fact that the tractor is heavy, and it has big tires (rolls easy) and both of those together means it rolls quite readily downhill, overwhelming the hydrostatic drive system. The part the original owner spoke of was probably a flow constrictor for the output side of the hydraulic motor on the back axle. That would prevent the tractor from freewheeling, but as you said, it would cause a loss in power and speed in every other situation. I'd just use the directional control lever to slow the unit by feathering it slowly into the reverse position until the unit descends the hill under control. It would probably be best to avoid steep hills if possible.

__________________
'76 IH 1066 Turbo Diesel, '73 IH 766 Diesel, '72 IH 574 Utility Gas, '56 IH 350 Utility Gas, '46 Farmall H Gas, '08 Bobcat Toolcat 5600 Turbo

Nobody puts that "C" word in front of MY International!

marcquebec

Hi the honda is still available , i think about buy it and after make a choice about wic one i keep.Honestly my need are not there ,,my honda hst 828 can do the job but i have to walk behind for 1/2 miles to blow snow at my second chalet.Thats why a tractor

marcquebec

i dont have decent pictures for now, i will go at my chalet for week-end and then i will take somes.

marcquebec

thanks a lot countryboy,i really appreciate an exhaustive plication like that.i cant avoid steep hill,but if i understand well,it is like an inversion of power,the pression from the weight and speed of the tractor increase oil preesion over the one provide by the pump,so the power is kind of inverted?? And to put the tractor in reverse dont hurt the transmission,is it right.regrds Marc.

marcquebec

oups i just read against carefully your post , and thanks again i understand whats happens,but can you tell me if there is a possible damage to put it on reverse like that??
Marc.

Country Boy

You don't need to go fully into reverse, but as was stated above, just to either side of Neutral is a buffer zone that you can use to retard the flow of oil in the system and use as a fluid brake. It shouldn't hurt the transmission as long as you go easy on it and don't just jam the lever from one direction to the other. You could also drag the brakes a bit to help keep it from getting away on you. I'd avoid towing a big wagon full of rocks or some other very heavy load downhill if you can avoid it because a load like that could overload the transmission on the way down. I think that as long as you use common sense, you should be fine with the hill.

__________________
'76 IH 1066 Turbo Diesel, '73 IH 766 Diesel, '72 IH 574 Utility Gas, '56 IH 350 Utility Gas, '46 Farmall H Gas, '08 Bobcat Toolcat 5600 Turbo

Nobody puts that "C" word in front of MY International!

marcquebec

Hi i have some pictures but how i post it here??

marcquebec

ok i understand i cant from my asus tablet ,i have to use a computer.Marc.

marcquebec

Hi again,i would like to do a cabin for my 446, if someone have advice or plans for it like the dimensions ,material to use, door ,soft or rigid,etc,,,thanksMarc.

marcquebec

here they are ,my pictures of case 446

Attached Images

   

BelarusBulldog

Very nice tractor you have there, sir. Looks heavy built! Should last you a long time. Thanks for the pictures.

__________________
Plowing, it's snow much fun!

marcquebec

Hi you now can take a look at my pictutres,and can you identifie the blower?
Marc.

Country Boy

It looks similar to the one a guy in town had on his 446, but I don't know the model number. It should be a Case brand blower. I think they (the tractor and blower) were built by Ingersol for Case but I am not positive about that.

__________________
'76 IH 1066 Turbo Diesel, '73 IH 766 Diesel, '72 IH 574 Utility Gas, '56 IH 350 Utility Gas, '46 Farmall H Gas, '08 Bobcat Toolcat 5600 Turbo

Nobody puts that "C" word in front of MY International!