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Clutch master cylinder on a case/david brown 1690

P

Paul Shuler

Member
I have a Case / David Brown 1690 tractor. A year ago the clutch master cylinder got to where it was leaking badly. I rebuilt it with a kit and it did fine for a while but now is leaking worse than ever. I got a new unit to replace it with. Here is my problem. A year ago I went all over our town trying to find mineral oil and no one had a clue what I was talking about. I even went to the local Case IH dealer and he said we just put universal hydraulic fluid in them and they are fine. Is this true or do I need to try harder and find some mineral oil. Dont want to ruin this new one. Thank you.
cvphoto373.png


cvphoto374.png
 
True Mineral oil is used in some refrigeration compressors. The old R12 compressors used mineral oil. In terms of master cyl's, it basically means anything but DOT 3 brake fluid. Hydraulic fluid is a fine alternative, so is Transmission-Hydraulic Fluid such as Hy Tran. When CASE 1st introduced hydraulic brakes with the advent of the 70 series, CASE had tags on the master cyl's that said to use TCH fluid. They were in fact, "mineral oil cyl's".
 
Sir, thank you so much for your reply. I appreciate it very much. Hope to get this back up and running while we still have some warm weather here in MO.
 
I cannot find anywhere that the can says "mineral oil". In fact it says "hydraulic brake oil". Regardless, both are fine for the "mineral oil" cyl's. At $38.00 per gallon, I say the CASE Hyd. Brake oil is a waste compared to any Transmission-Hyd. oil including their own Hy Tran.
 
(quoted from post at 12:13:09 12/26/19) I cannot find anywhere that the can says "mineral oil". In fact it says "hydraulic brake oil". Regardless, both are fine for the "mineral oil" cyl's. At $38.00 per gallon, I say the CASE Hyd. Brake oil is a waste compared to any Transmission-Hyd. oil including their own Hy Tran.
Click to expand...

No one has mentioned this, (but I'm sure everyone here realizes) those tractors use brake cylinders that will leak internally into the tractor "rear end" if they fail, so they use a brake fluid that is compatible with the rear end/hydraulic oil if a leak occurs.

I would assume they use the same oil in the hydraulic clutch, to avoid even more confusion.

Several years ago, I read something about some special qualities of the "brake oil", making it more desirable than common "UTF" for the purpose.

The dealer said the oil in my photo is a factory substitute for the original, and a quart will last a LONG time., making the $9.50 price not a big deal to me.
 
This is a good discussion. In the CASE world, as far as I know, in the non power master cyls, CASE always recommended the use of their TCH oil. Even in the early 70 Series where the brakes were outside, completely isolated from the tranny. TCH and Hy Tran are "Transmission-Hydraulic Oils". A much better choice than straight hydraulic oil in a hydraulic or tranny situation because "Tranny-Hyd." oil not only contains the anti foaming qualities of the hyd. oil, but also the Extreme Pressure (EP) protection qualities, not found in straight hyd. oil.

The CASE "Hydraulic Brake Mineral Oil" is a sales gimmick, with very high profit margin. To be labeled a "Hydraulic" oil, it must contain the anti foaming qualities of a hydraulic oil, but no where does it say it contains the "EP" qualities of a tranny oil. This oil if super fine in a brake system that requires mineral oil, but to say or imply it is superior to TCH or HY Tran or any Transmission Hydraulic Oil is not true.
 
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