no 2-3 upshift and need car ASAP tks - Page 2 - PeachParts Mercedes-Benz Forum

richclan · #16 10-26-2011, 04:22 PM

thanks i'll ck it out

richclan · #17 11-15-2011, 06:05 PM

update not a good 1

with the trans modulator disconnected its been drivable when the trans is a little warm. when it was just started [cold] it wouldnt shift into 3rd.

today that all changed; it wont shift into 3rd at all.

i tried using my MV to put 5-15 in vacuum to the modulator but no change.

i dont know what the vacuum dashpot looks like

can someone post a photo of it and maybe a link to a diy thread to clean it?

thanks im at the end of my ability to figure it out

thanks

MTUpower · #18 11-15-2011, 06:58 PM

I leak a bit of Tranny fluid, and when it's low it stops wanting to shift out of 2nd. I add fluid and presto it's back to normal. So.......... is your fluid low?

richclan · #19 11-15-2011, 07:22 PM

Quote:

Originally Posted by MTUpower

I leak a bit of Tranny fluid, and when it's low it stops wanting to shift out of 2nd. I add fluid and presto it's back to normal. So.......... is your fluid low?

nope and the filters recently new too

kerry · #20 11-15-2011, 07:52 PM

Have you tried unplugging the kickdown switch?

richclan · #21 11-15-2011, 07:57 PM

Quote:

Originally Posted by kerry

Have you tried unplugging the kickdown switch?

yes and the valve cover mounted downshift switch also [1985 ]

also forgot to add that trans will be in neutral [slipping] if going fast enough from the 2nd gear upshift shift point

chuck07 · #22 11-15-2011, 11:46 PM

Is it safe to disconnect the vacuum modulator and plug the hoses then drive the car normally?

I just unplugged it to test, and my transmission shifted a lot better, after having some of the same problems as OP. I will get to fixing it properly when I have more time.

richclan · #23 11-16-2011, 01:00 PM

ARMY this is your trans.

mine is an 85 and much different i dont have the dashpot or kickdown solenoid

HELP!!!!!!!!!

Stretch · #24 11-16-2011, 02:29 PM

Your transmission should look more like this

Have you managed to find a 722.3 / 722.4 manual yet?

Have you still got the same symptoms as described in your first post?

Can you find the whole transmission number on the side of the casing just above the oil pan on the right hand side of the transmission? If you've got that then I can check through the German FSM for you - but you'll have to be patient - I can struggle by with Dutch but my German is pants...

richclan · #25 11-16-2011, 02:33 PM

Quote:

Originally Posted by Army

Your transmission should look more like this

Have you managed to find a 722.3 / 722.4 manual yet?

Have you still got the same symptoms as described in your first post?

Can you find the whole transmission number on the side of the casing just above the oil pan on the right hand side of the transmission? If you've got that then I can check through the German FSM for you - but you'll have to be patient - I can struggle by with Dutch but my German is pants...

LOL yes still same symptoms ill get the number in a few

what else externally controls the shifting [ vacuum mod. bowden cable]

note there is an electrical plug in the back of trans is that the reverse switch?

Stretch · #26 11-16-2011, 02:49 PM

Quote:

Originally Posted by richclan

LOL yes still same symptoms ill get the number in a few

what else externally controls the shifting [ vacuum mod. bowden cable]

note there is an electrical plug in the back of trans is that the reverse switch?

There is an electrical connector for the reverse lights. The shifting "when" is usually done by some sort of connection to the throttle linkage but that isn't the case for all - there are always exceptions!

richclan · #27 11-16-2011, 02:51 PM

here it is Army
722 315 02
thanks

Stretch · #28 11-16-2011, 03:16 PM

Quote:

Originally Posted by Army

Nope - you'll find it at the back of the transmission on the right hand side.

On the 722.3 transmission the vacuum dash pot can be found on the left hand side of the transmission in the middle...

...totally different place from a 722.1... (I'm learning too - really couldn't have been more inaccurate - anyway deep breath)

According to ATSG the colour code for your 722.315 transmission vacuum dash pot should be "GREEN"

I think it is worthwhile taking it out and seeing what condition it is in before going any further. Look for cracked rubber connections or any damage or anything "obvious" (yeah I know obvious isn't always obvious!)

richclan · #29 11-16-2011, 03:54 PM

Quote:

Originally Posted by Army

On the 722.3 transmission the vacuum dash pot can be found on the left hand side of the transmission in the middle...

...totally different place from a 722.1... (I'm learning too - really couldn't have been more inaccurate - anyway deep breath)

According to ATSG the colour code for your 722.315 transmission vacuum dash pot should be "GREEN"

I think it is worthwhile taking it out and seeing what condition it is in before going any further. Look for cracked rubber connections or any damage or anything "obvious" (yeah I know obvious isn't always obvious!)

thanks a bunch
i guess its straight forward, lower trans unbolt and clean?
no surprises like springs shootin all over or fluid gushing LOL
please reply HAHA seriously

and by dashpot your not referring to the modulator?????

richclan · #30 11-16-2011, 07:35 PM

i figured out that i have a kick down solenoid on the back of the trans.

the wire i referred to earlier is not the reverse sw. its the solenoid hot wire.

this wire goes to the kick down sw. under the throttle.

i tested mine and it works fine. engine running sw. pressed 13+ VDC
1VDC static

i guess i'll remove the kick down solenoid and see if its dirty / sticking. i can only hope its this.

any other ideas are WELCOME !!!!