Porsche 928 Workshop Manual page 798

38
Automatic Transmission / Gears, Valve Body
!1 28
Checking Modulator Pressure
1. Compress circlip (arrow) and remove cover.
2. If inside of cover is wet with ATF. replace
modulator.
3. Adjust if necessary.
Checking Main Pressure
Note
Not adjustable. modularor pressure auromarically
affects main pressure.
Changing modulator pressure also changes shifr
points.
Checking Governor Pressure
Not adjustable.
Adjusting Modulator Pressure
1. Compress circlip and remove vacuum modulator
cw/er.
2. Slightly pull adjuring key out and turn screw
3. After adjusring. push key into nearest slot.
One turn of setting screw results in 0. 2 ba.1
(2.8 psi) pressure change.
Replacing Vacuum Modulator
1. Pull off vacuum hose.
2. Compress circlip and remove cover.
3. Remove modularor using 22 mm open end
wrench.
4. When installing. apply non-hardening sealing
compound to threads.
3R - 8
Checking Transmission Operation Printed in Germany