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Instrument for testing automatic transmission fluid control devices

  • US 6,038,918 A
  • Filed: 12/22/1997
  • Issued: 03/21/2000
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Fees
First Claim
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1. A test instrument for quickly detecting defects in the fluid control devices associated with a vehicle automatic transmission, said fluid control devices having been removed from said automatic transmission, and said instrument comprising of:

  • a. a 0-35 volt variable voltage power supply operatively associated with a current limiting circuit, as means of supplying a controllably variable electric current to said fluid control device known as a solenoid, andb. a dual range ammeter, operatively associated with said power supply and the current limiter, as monitoring means of determining value of current flow to the coil of said solenoid, andc. a volt ohmmeter as monitoring means of determining resistance and voltage simultaneously when testing a solenoid coil or when testing contact resistance of a fluid control device known as a pressure switch, andd. an air circuit operatively associated with a supply of pressure regulated compressed air as means of supplying air flow to fluid passages of said solenoid, ande. an air output ball valve as control means of quickly varying said air flow into said fluid passages of said solenoid, andf. an air out pressure gauge located at output of said air out ball valve, as monitoring means of determining air pressure at input of said solenoid, andg. an exhaust ball valve as control means of quickly varying said air flow exiting from said fluid passages of said solenoid, andh. an exhaust pressure gauge located at input of said exhaust ball valve as monitoring means of determining air pressure at output of said solenoid.

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