Automatic Transmission/Transaxle: Adjustments

MEASURING AND ADJUSTING PRESSURE VALUES








1 Tester 123 589 04 21 00 - For measuring working pressure, modulating pressure and governor pressure. Enter pressure hoses through window of righthand driver's door and clamp down with window pane. Pressure hoses should not sag or rest against exhaust pipe.
A Test connection for working pressure - Connect pressure gauge with measuring range up to 25 bar
M Test connection for modulating pressure - Connect pressure gauge with measuring range up to 10 bar
R Test connection for governor pressure - Use pressure gauge similar to modulating pressure

Special Tool:

Attention!
Operate parking brake during all adjusting jobs on vehicle when the engine is running. with selector lever in position "P".

When measuring with engine stopped and driving position engaged, operate service brake in addition to parking brake.

Upon testing, run engine and check measuring points for leaks.

Measuring Modulating Pressure





1 Unscrew holder (26).
2 Pull off vacuum line (10) on vacuum control unit (60).
3 In selector lever position "D", drive at approx. 50 km/h and read pressure value.

Attention!
On vehicles with engine 110, apply full throttle while measuring.

Adjusting Modulation Pressure








4 Remove rubber cap on vacuum control unit.
5 Pull locking plate (2) out of locking slots to permit rotation.
6 The adjusting screw in vacuum control unit can now be adjusted by means of locking plate. One turn of adjusting screw results in a pressure change of approx. 0.4 bar gauge pressure.
7 After turning adjusting screw, push locking plate back into locking slots.
8 Put rubber cap back on vacuum control unit (60).
9 Measure modulating pressure once again.
10 Plug-on vacuum line (10) and screw to holder (26).

Measuring Working Pressure
11 Pull vacuum line from vacuum control unit.
12 Start engine and let run at approx. 1000 rpm reading the pressure value with engaged driving position "D".

NOTE: The working pressure cannot be adjusted. Measuring simply provides information concerning operation of working pressure regulating valve in shift valve housing. When measuring the working pressure, make sure that the modulating pressure has been accurately set.

Measuring Governor Pressure
Drive vehicle on drum dynamometer or on the road at the speed named in tables and read indicated pressures. If no governor pressure is indicated, remove centrifugal governor and clean.

If all the pressure data differ from the values named on tables, replace centrifugal governor.