Apparatus and method for service of an automotive automatic transmission
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United States of America Patent
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Sep 15, 1998
Grant Date -
N/A
app pub date -
Mar 13, 1997
filing date -
Mar 13, 1997
priority date (Note) -
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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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