PeachParts Mercedes-Benz Forum - View Single Post - Help-Trans fluid in the Shift Modulator vac. tube.

dpetryk · #4 01-13-2002, 11:43 AM

I dont think you understand. There is a port on the side of the transmission that is where you connect the test guage. You do not connect the pressure guage to the modulator valve in any way, shape or form. You need one that goes to 250psi since that is the highest pressure in the tranny. You disconnect the vacuum line to the modulator to set the modulator pressure. The modulator pressure is not present in the vacuum line that leads to the engine. The engine vacuum is what modulates an internal pressure used by the transmission. It is this pressure that needs to be set. And you do it without any vacuum present on the modulator. There is a mechanical setting on the modulator that you trun to set the pressure. The tranny has to be turning the wheels at 31 MPH while the setting is made. Watch the guage and turn the setting until the pressure is set.