Apparatus and method for service of an automotive automatic tran

Details Apparatus and method for service of an automotive automatic tran Apparatus and method for service of an automotive automatic tran

1997-03-13

1998-09-15

Denion, Thomas E.

Lubrication

Automobile crank and gear case service

141 98, F16C 314

Patent

active

058066292

ABSTRACT:
A fail-safe transmission service machine allows old ATF to be pumped out of a transmission while the vehicle engine runs, and responsively pumps a matching volume of new ATF into the transmission so that dry running of the transmission can not occur. If the supply of new ATF runs out or if power to the service machine is interrupted, the machine reverts to closed loop fluid circulation for the transmission. A hydraulic rectifier provides for universal connection of hoses between the transmission cooler fluid circulation loop of the vehicle and the service machine. An alternative embodiment of the machine allows for similarly fail-safe exchange of power steering fluid from a vehicle, and replacement of the old fluid with new power steering fluid.

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