A/T - Brake Band Piston Modification

REF. NO. 27/77

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALER

DATE: December 1986

SUBJECT:
MODIFIED BRAKE BAND PISTON B1 WITH PRESSURE PIN TRANSMISSION 722.3 (W4A 040) AND 722.4 (W4A 020)





As of April 1986 production, the above-mentioned transmissions are equipped with a modified brake band piston B1 with removeable pressure pin (previously caulked). The pressure pin (38) is held in place in the piston by an O-ring (137). Brake band play can be adjusted with shims (136), available in 0.5 mm, 1.0 mm and 1.5 mm thicknesses (Figure 1).





Effective Serial Number

Note:
When installing the modified brake band piston B1, into transmission 722.3 up to end number 655877 and into transmission 722.4 up to end number 180000, the brake band guide must also be replaced.

Upon stock depletion of the previous version brake band piston, only the modified version will be available.





Parts Information

According tot he latest time guide microfiche