Would anyone happen to know the procedure in testing the proper transmission vacuum modulator pressure using the vacuum gauge(s) for a 722.502 transmission? I understand that the car must be driven and the gauge(s) hooked into the transmission. It is from these operating vacuum pressures that the vacuum modulator can be set (clockwise to reduce soft shifts & counter-clockwise to reduce hard shifts).
Its not tested under vacuum pressure, it is tested by connecting an oil pressure guage to the transmission and then adjusting the vacuum box until the correct oil pressure is reached and is done at idle speed.
Hope this helps and the correct proceedure is shown in WIS if you have a copy?
actually you are both kinda correct, but its fluid pressure, tested while the car is being driven
the gauge is made by mercedes, hooked up to the tranny to measure the operation pressure as well as the modulation pressure. and it has 2 dials that can be hooked to the rear view mirror, so you can register the pressure while you're driving.
Thanks for your quick replies. I recently had my trans. rebuilt and wanted to confirm the pressures per the tech. literature I had read. The shifts are a little bit on the harsh side & I wanted to reduce them (soften shifts). I understand that counterclockwise makes them smoother. I don't want to over do the adjustment as the new Benz modulator is suppose to be somewhat pre-adjusted. Trying to get a more accurate reading & I understand that looking to the trans. operating pressures are important to gauge current condition.
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