Date registered: Jul 2013
Vehicle: 1990 420 SEL, 1990 560sel, 1991 300e
Location: Ontario, Canada
Mentioned: 1 Post(s)
Quoted: 109 Post(s)
Im trying to find the hydraulic circuit diagrams for the 722.3 trans in my piles of paperwork. I have diagrams for each fluid path for each gear for the trans.
Reason I want to look at them is because, from a stop, the kick down solenoid only needs to be quickly triggered (less then 1sec), for it to command the trans into first gear, it will hold first gear and shift to 2nd based on the boden cable/throttle position. It acts like a normal trans, normally it will upshift to 2nd @ around 10-15km/h. It will hold 1st gear forever if the kick down solenoid stays continuously triggered, in my case for standard day to day driving, I only want it to quickly trigger the kick down solenoid for a short time when at a stop, then let the trans upshift as it feels.
Why does this matter?
Well the kickdown solenoid should have a direct fluid path to the 1-2 shift spool valve. And forces the valve into a commanded 1st gear. This valve should be spring loaded, thus it defaults into 2nd, unless forced. Configuring the trans to have a first gear start could be as easy as removing a shuttle spring, and possibly swapping the side it sits on.
I also have a list of which trans had 1st gear start, and which had a 2nd gear start. Ill post it up if anyone is interested.
Yes shifting into 1st might cause some aggressive starts for the majority of us due to the fact that we are used to the standard 2nd gear start, and normally give these cars a bit more throttle to get moving.
To see what a standard 1st gear start would feel like, when stopped put the selector into B (1st), then back to D. It will start from 1st gear, and shift up normally to 2nd around 10-15km/h with normal acceleration input.
560 guys might not find this of any use, but 420 cars could help slightly with a 1st gear start, I manually do it quite frequently when driving around town in stop and go traffic.
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