Opel 1900 1973 Service Manual page 436

f . O p e r a t i o n o f C o n t r o l s i n L o w R a n g e F i r s t Gea
Reverse Clutch Released T h i r d C l u t c h A p p l i e d
Second Clutch Released
L o w B a n d A p p l i e d
Locked
When the selector
through the valve. Low oil is directed to the 1 2 shift valve train which acts with the I 2 shift valve spring against governor oil pressure to close off drive
oil from passing into the second clutch passage. At the same time, low oil is directed to the Reverse and Low control valve and acts against the spring to
allow detent regulated oil at the Reverse and Law control valve to flow to the 2 3 shift valve, which is bottomed in its bore by intermediate oil pressxe
and the valve spring. The detent oil pazses through the 2 3 shift vahre and into the third clutch oil passages
modulator oil pressure from the 3-2 control valve to the 2 3 shift control valve. Third control oil isalSo directed to the Reverse and Law control valve.
which is held open against its spring by low oil pressure. and closes off the source of rupply to the servo release pasege.
band. Intermediate oil seats the check ball at the Reverse passage at the presue regulator boost valve cavity and continues to the pressure regulator valve
The third clutch in on, the band is on. The transmi&n is in Low Range First Gear