MM R and Z hydraulic questions

JOCCO

Well-known Member
Well, purveyors of MM by now you have figured out I am working on my R. I have the pump on the engine and the hydraulic tank under the fuel tank. Question is hydraulic lever for operating it, where does it go what does it look like? any pictures? Tractor is I believe a 47 not the later one without the louvered hood. I know the early ZTU did not have hydraulics.
 
My 51 is bolted to the right hand side of the instrument panel be hind the gas tank above and behind the tool box door, sorry I don't have a picture, may be someone else on here does.
 
This is a 1950 R. I hope this helps. These are the best pictures I have.
 

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Thank you couple questions what is the hose or cable going down from the lever? What is the round metal frame for by belt pulley?
The small rod going from the hydraulic lever goes down to the lifting roll. The lifting roll was used for the cultivator and mounted implements. When the hydraulic cylinder is mounted on the lifting roll you could set the depth of the implement on the quadrant on the hydraulic lever. When the cylinder reached a certain length, the rod kicked the lever back into neutral.
 
The small rod going from the hydraulic lever goes down to the lifting roll. The lifting roll was used for the cultivator and mounted implements. When the hydraulic cylinder is mounted on the lifting roll you could set the depth of the implement on the quadrant on the hydraulic lever. When the cylinder reached a certain length, the rod kicked the lever back into neutral.
Ok that explains it better.
 
There is two type of hydraulics for R. Early models had cam lobe driven pump that used oil from motor used for mounted implements. Later has the Eaton pump driven off cam gear and reservoir called Unimatic system. Control lever on right side
 
Does an anyone have a screenshot of the plate you are referring to? I am not seeing it in my Service Manual. I do need to invest in a parts catalogue
Thank you
 
Does an anyone have a screenshot of the plate you are referring to? I am not seeing it in my Service Manual. I do need to invest in a parts catalogue
Thank you
It's the side cover for the engine on the drivers side. Some were made for the gear driven hydraulic pump. Some were just a cover. Some were made for the cam lobe engine oil pump. Some were cast others were pressed metal.
 
Sorry to keep coming back but I am interested in the Unimatic system that holds its own oil vs. the engine oil-using pump. Does the attached picture look correct to the Unimatic system?
 

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Sorry to keep coming back but I am interested in the Unimatic system that holds its own oil vs. the engine oil-using pump. Does the attached picture look correct to the Unimatic system?
Yes, that is the Eaton brand hydraulic pump. When replacing the pressure hose that goes to the reservoir don't over tighten it by the pump as you can crack the flange it screws into. I believe the gaskets are still available for them. There is a flattened "O" ring on the pressure side and a triangle gasket between the flange and pump.
 
Thinking back in the day motor and Unimatic used the same oil. Is a line off the hydraulic reservoir that connects to crankcase for overflow.
 
@molinegb and @Alan K THANK YOU for sharing your knowledge here
I know it’s not standard equipment for an RTI to have this system, but I like my equipment to earn its keep and while I don’t know what ill run off this system with its modest capacity, it may be a fun way to preserve it. So run engine oil through that pump?
 
FYI: That line between the unimatic reservoir and the engine crankcase was not for overflow. it was a vent for the unimatic reservoir.. I guess MM figured the air inside the crankcase should be cleaner than outside air. So they hooked the vent to the engine crankcase.
If the unimatic system is working correctly, there should never be any overflow into the engine.
They don't use engine oil in the hydraulics either. I think it was originally 'Type S' automatic trans. fluid. I use DextronIII/Mercon in mine.

I also know from experience that piston rings don't lubricate well if ATF is getting into the crankcase. ATF makes the oil just too thin. And it is an expensive repair.
 

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