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Gear oil vs hydraulic oil

P

perryjosh64

Member
Folks I m piggybacking on a previous post on related topic to gain knowledge. This is for a 64 Ford 2000 tractor. Have a slow trans leak going on that is worse during hot summer months (SW GA). Need to split tractor/replace seals but not ready for that. Original lubricant for trans was 80wt gear oil. Most recommendations now are to run 134D hydraulic oil in trans/hydraulic/rear.
The reason I m looking to go with 80 to 90wt gear oil is thinking a higher weight/ viscosity will slow or stop leak without killing tractor. Not a smart guy when it comes to oil ratings/viscosity/etc. and looking for knowledge on subject. So is 90WT fear oil thicker/higher viscosity than a 134D hydraulic oil?
 
90W is the same thickness as 30-40 weight motor oil.

Combo trans-hydraulic fluid is the same thickness as 20 weight motor oil unless special winter-grade that is 10 weight.
 
Here is what Henry Ford used in transmissions with NO seals from the factory. Pretty thick stuff but I have no idea of the actual viscosity.
Maybe a 50-60W using the motor-oil scale?

Remember the weight numbers have different meaning when used for engines versus when used for gearboxes.
cvphoto25461.jpg
 
(quoted from post at 08:42:25 06/06/19) Here is what Henry Ford used in transmissions with NO seals from the factory. Pretty thick stuff but I have no idea of the actual viscosity.
Maybe a 50-60W using the motor-oil scale?

Remember the weight numbers have different meaning when used for engines versus when used for gearboxes.
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto25461.jpg">
Click to expand...

some of the model t guys make this by mixing grease with a bit of 90wt. or so I have heard?
 
This website has some good viscosity information.

Scroll about half way down, there is a chart. Read across, 1st column is hyd oil, 2nd is industrial gear box oil, 3rd is engine oil, 4th is automotive gear oil.

That will give you an idea what you have and what you are looking for.

If you suspect worn, hard seals, might try some Lucas seal conditioner. I've had it buy some time, works fairly well.
Oil Viscosity
 

Any wet brakes or wet clutches in the system ? Will other tractors with wet brakes and wet clutches share the same hydraulic implements ?
Unless the oil specifically states that it wet clutch/wet brake comparable , it isn t .
Better to dump a can of seal swelling agent into the system to soften and enlarge the remaining seals .
 

Any wet brakes or wet clutches in the system ? Will other tractors with wet brakes and wet clutches share the same hydraulic implements ?
Unless the oil specifically states that it wet clutch/wet brake comparable , it isn t .
Better to dump a can of seal swelling agent into the system to soften and enlarge the remaining seals .
 
Most recommendations now are to run 134D
hydraulic oil in trans/hydraulic/rear.


That sounds like it should have the caption..... I
heard it on the internet so it must be true.

I have heard the same advice in the past but I still
use what the original owners manual says to use.
 
(quoted from post at 11:36:34 06/06/19)
Any wet brakes or wet clutches in the system ? Will other tractors with wet brakes and wet clutches share the same hydraulic implements ?
Unless the oil specifically states that it wet clutch/wet brake comparable , it isn t .
Better to dump a can of seal swelling agent into the system to soften and enlarge the remaining seals .
Click to expand...
Yyeeaahh...I don t have a clue how to tell if I got "wet" brakes/clutch? This is a 1964 Ford 2000 tractor 4 cylinder gas engine w/4 speed trans. I m guessing not "wet" based on age but don t know.
 
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