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Case Tractors Discussion Forum

Re: Clutch master cylinder on a case/david brown 1690

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Author  [Modern View]

12-26-2019 14:54:34

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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.

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John Saeli

12-27-2019 06:17:46

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 Re: Clutch master cylinder on a case/david brown 1690 in reply to Bob, 12-26-2019 14:54:34  
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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