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  #1  
Old 03-11-2012, 12:32 AM
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722.xxx transmission vacuum modulators

There are three revisions of the 722.xxx transmission vacuum modulator.

Factory build unit = the car was sold factory NEW with this one.

Update #1.

Update #2

Here are pictures of them explaining (best possible) the visible variation in design.

.
Attached Thumbnails
722.xxx transmission vacuum modulators-superseded-levels-722.xxx-vacuum-modulator_z8w5y1h2qkp_1.jpg  

Last edited by whunter; 03-08-2013 at 01:26 PM.
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  #2  
Old 03-11-2012, 12:33 AM
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Factory build unit = the car was sold factory NEW with this one.

Most of these fail from use - old age.

.
Attached Thumbnails
722.xxx transmission vacuum modulators-original-factory-722.xxx-vacuum-modulator_z8w5y1h2qkp_1.jpg  
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  #3  
Old 03-11-2012, 12:33 AM
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Update #1.

The technology of plastic/rubber advanced.
Daimler looked at parts proliferation, and set engineers the task of reducing duplicate components where possible.

The W126 vacuum modulator was more robust/advanced + the tooling was newer = more cost effective to drop the earlier unit.

EPC makes note of the fact that the pin/cup MUST change to use the W126 part.
More on that later.

.
Attached Thumbnails
722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_revision-2_z8w5y1h2qkp_1.jpg  
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  #4  
Old 03-11-2012, 12:33 AM
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Update #2.

Daimler reduces cost/increases profitability by continuously looking at parts proliferation, and keeps engineers busy eliminating duplicate components where possible.

The latest vacuum modulator is totally re-designed-engineered.
Using the most advanced minimalist - simple design possible.
The technology of plastic/rubber have advanced substantially.

Engineers tweaked the new design for backward compatibility, and superseded all other units.

.
Attached Thumbnails
722.xxx transmission vacuum modulators-latest-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_1.jpg  
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  #5  
Old 03-11-2012, 01:21 AM
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What changed that matters to YOU when replacing this unit?

The factory original unit had a smaller diameter piston, and the cup bore was a perfect fit.

Revision #1 had a LARGER diameter piston, and the ORIGINAL cup bore is to SMALL, if you try to force fit these, the plastic pin/cup will break.

Revision #1 requires the (BLACK) NEW/superseded pin/cup, for proper fit - function.

Revision #2 is a radical design change/complete kit, requires removal - discard ( as not needed) the old style pin/cup.

******************************************************************

Picture #1.

Shows the factory unit with the factory pin/cup, and revision #1 with the (BLACK) NEW/superseded pin/cup.


******************************************************************

Picture #2.

Shows revision #1 with the factory pin/cup pressed firmly in place, just short of breaking.


********************************************************************

Picture #3. shows

the factory unit with the (BLACK) NEW/superseded pin/cup installed.

Revision #1 with the factory pin/cup pressed firmly in place, just short of breaking.

Revision #2 with the pin stub installed.

*****************************************************************

Picture #4 and #5.

Shows you the piston face.


.
Attached Thumbnails
722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_1.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_2.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_3.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_5.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_6.jpg  

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  #6  
Old 03-11-2012, 01:22 AM
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More pictures_1
Attached Thumbnails
722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_7.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_8.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_9.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_10.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_11.jpg  

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Old 03-11-2012, 01:22 AM
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More pictures_2
Attached Thumbnails
722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_12.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_13.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_14.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_15.jpg   722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_16.jpg  

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  #8  
Old 03-11-2012, 01:23 AM
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More pictures_3
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722.xxx transmission vacuum modulators-warning-earlier-revision-722.xxx-vacuum-modulator_z8w5y1h2qkp_17.jpg  
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  #9  
Old 03-11-2012, 04:55 AM
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Nice thread! Can you put in image tags to make the pictures BIG?
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  #10  
Old 03-12-2012, 08:52 AM
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Whunter, could you measure the nozzle of these? The part that gets inserted into the transmission. I swear one of these models could not be inserted into the transmission body.
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722.xxx transmission vacuum modulators-img_0737a.jpg  
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  #11  
Old 03-12-2012, 10:26 AM
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Hmm

Quote:
Originally Posted by jmbeam View Post
Whunter, could you measure the nozzle of these? The part that gets inserted into the transmission. I swear one of these models could not be inserted into the transmission body.
Here is a graphic to explain the transmission bore.

.
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722.xxx transmission vacuum modulators-722.xxx-vacuum-modulator_bore_1.jpg  
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  #12  
Old 03-12-2012, 11:45 AM
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Done

Quote:
Originally Posted by Army View Post
Nice thread! Can you put in image tags to make the pictures BIG?






































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  #13  
Old 03-12-2012, 12:35 PM
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RESPECT!
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  #14  
Old 11-28-2012, 10:15 AM
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Bump

for customer
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  #15  
Old 11-28-2012, 11:36 AM
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thats for the 722.3? 722.4s are black ?
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