Replacing Multi-Disc Brakes D/G
Replacing Multi-Disc Brakes D/G
Disassemble and assemble/replace planetary gear sets I and II.
Refer to > Configuration of multi-plate brake"D/G"
Insert special tool 24 1 250: Pull bar upwards.
Insert special tool and press bar downwards.
Note: Multi-disc brake D/G is removed complete with clutch "F" and the planet gears, and held together by the special tool.
Remove transmission extension: Unscrew bolts.
Installation:
Install guide (1) for cable holder.
Pull off transmission extension.
Note spacer (1).
Replace O-Ring (2).
Remove brake/clutch unit "D/G":
Remove all three Blister head screws.
Remove multi-disc brake D/G complete with clutch "F" and planet gears.
Install brake/clutch unit "D/G":
Using special tool 241 250, insert multi-disc brake D/G complete with clutch F and planet gears into transmission housing, making sure that all three bores for threaded fastener are aligned.
1. Install all three screws handtight.
2. Preload center screw with 30 Nm.
3. Preload both outer screws with15 Nm then tighten down to30 Nm.
4. Tighten all screws to63 Nm, starting on the center screw.
Caution: If parts of brake/clutch unit "D/G" are replaced, the spacer disc must be recalculated.
Rotate transmission through 180° (output side facing upwards).
Place transmission extension on vise jaws.
Output flange must not bear.
Press output flange in direction of output.
Measure distance (A) from shoulder to sealing surface and distance (B) from shoulder to end of output flange.
Example:
A = 10.0 mm
B = - 7.4 mm _____________
C = 2.6 mm
Measure distance (E) from sealing surface to shoulder (1) on parking lock gear.
Press in parking lock gear for this purpose.
Example:
E = 4.0 mm
Calculate thickness of shims:
Distance E
Distance - C
Axial play: - (0.15 to 0.35 mm) ____________
= Total thickness of spacer
Example of calculation:
- E = 4.0 mm
- C = 2.6 mm
- Axial play e.g. 0.2 mm
- Spacer = 1.2 mm
Install spacer (1) of correct thickness.
Spacers are available from Parts in thicknesses of 0.8 to 2.8 mm.