Apparatus and method for cleaning and fluid exchange of a low-flow automatic transmission
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United States of America Patent
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-
May 23, 2000
Issued Date -
N/A
app pub date -
Jun 29, 1998
filing date -
Mar 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fail-safe transmission service machine (12) allows old ATF to be pumped out of a transmission (10b) as a vehicle engine (10a) runs while the vehicle (10) is stationary. The machine (12) 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 (12) is interrupted, the machine reverts to closed loop fluid circulation for the transmission. A hydraulic rectifier (42) provides for universal connection of hoses between the transmission cooler fluid circulation loop (39) of the vehicle (10) and the service machine (12). An electrically driven assistance pump (94) allows the service of vehicles which have low-flow or low-pressure transmission pumps.
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