A/T - Valve Body Update Improves Partial Load Upshifts
84mercedes02TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: September, 1984 REF. NO. MBNA 27/7a
SUBJECT: IMPROVED SHIFT QUALITY, AUTOMATIC TRANSMISSION 722.3 MODELS 123.133/153/193 AND 126.120
This Service Information was revised to include the transmission end no. range for which the valve body repair kit is valid. Please discard your copy of MBNA 27/7, July 1984.
Since September 1983, a modified valve body has been installed to improve partial-load upshifts.
Production Phase-In: September 1983
Model As of Transmission End Number
123.133/153/193
416 477
126.120
For transmissions with end numbers within the ranges below, there is now a valve body repair kit available to improve hard 1-2 and soft 3-4 upshifts:
Model Transmission End No. Range
123.133/153/193 161 574 to 416 476
126.120 167 838 to 416 476
NOTE: Before installing the repair kit, first check for correct adjustment of:
- control pressure cable
- vacuum control valve
- modulator pressure
For adjustment procedures, see Service Information MBNA 27/6, July 1983.
Additional information on valve bodies for transmissions below these end no ranges can be found in Service Information 27/59, January 1983.
Figure 1:
Procedure
1. Remove and disassemble valve body (job no. 400 and 420).
2. Remove closing cover (87) and compression springs with valve (Figure 1).
Figure 2:
3. Insert new K2 clutch valve (blue color) with compression springs (49 a and b, Figure 2).
NOTE: For compression spring dimensions see Technical Data.
4. Reinstall closing cover.
Figure 3:
5. Remove closing cover (86) and compression springs with valve (Figure 3).
FIGURE 4:
6. Insert new B1 brake band valve (52, yellow color) with compression springs (52 a and b, Figure 4).
7. Reinstall closing cover.
8. Assemble valve body using a new intermediate plate (supplied in kit).
FIGURE 5:
9. Remove all screws from closing cover (84) except screw (82). Press down on pressure control valve (46) and swing out closing cover far enough to remove control valve (Figure 5).
FIGURE 6:
10. Replace spring loaded pressure control valve (46 b, Figure 6).
11. Reinstall closing cover.
Parts Information
Part Name Part Number
Repair Kit 126 270 92 32
Time Allowance
02-2727 01 Valve body, R & R and modify 1.8 hours
02-2727 02 Valve body, R & R and modify 1.6 hours
(with Maint. or Repair work)
Technical Data (dimensions in mm)
Figure Compression Free Wire Number
No. Spring Length Dia. of Coils
2 (49 a) 32 1.2 14
2 (49 b) 65 1.2 18
4 (52 a) 37 1.3 13
4 (52 b) 56 1.2 16