Mobil 424 Hydraulic Fluid vs Hy-Gard - Page 2 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #16 of 17 Old 06-20-2019, 04:52 PM
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Re: Mobil 424 Hydraulic Fluid vs Hy-Gard

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Originally Posted by TUDOR View Post
A transaxle is a transmission and final drive (rear end reduction and differential) all in the same case



Many older hydros were mated to separate final drives in both LTs and GTs. While normally both are removed if service is required for either the transmission or the final drive, the larger hydro transmissions can often be pulled while leaving the final drive in the chassis. Since only the final drive is bolted to the chassis, the reverse isn't feasible.
My Massey 12 service manual refers to its hydra-speed as a transmission and rear axle. Its pump is part of the transmission (as opposed to the auxiliary hydraulics pump) and does not encompass its fluid displacement motor.

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post #17 of 17 Old 06-21-2019, 04:59 PM
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Re: Mobil 424 Hydraulic Fluid vs Hy-Gard

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Originally Posted by Caustic View Post
My Massey 12 service manual refers to its hydra-speed as a transmission and rear axle. Its pump is part of the transmission (as opposed to the auxiliary hydraulics pump) and does not encompass its fluid displacement motor.
Take another look at it. The hydro pump, motor, and reservoir are one unit, and the Tecumseh/Peerless 2400 final drive is a separate unit with the connecting bolts and a coupling between them.

Page 76 of this manual.

Yes, the pump, motor and reservoir can be separated from each other for maintenance and repair, the same as the heads can be separated from an engine block, but they can only function as a complete unit. The hydro doesn't need the final drive to function any more than the engine in your car or truck needs the transmission.

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Last edited by TUDOR; 06-21-2019 at 05:06 PM.
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