14a - External brake support B2 or piston B3; 14b-d - O-rings for brake B3; 27 - Brake piston B2; 28 - Piston guide ring; 28a-b - O-rings on the piston guide ring; 29, 134b - Disc springs; 30 - Spring plate; 31, 134a - Retaining rings; 32 - Brake piston guide В2 and ВЗ; 32a - O-ring; 134 - Disc block
Disassembly and assembly of the B2 multi-disc brake
31 - Retaining ring
074 - Puller
Disassembly and assembly of the B2 multi-disc brake
27 - Piston
28 - Piston guide ring
137 - Valve
Disassembly and assembly of the B2 multi-disc brake
A - Oil channel of the piston B3
B - Oil channel of piston B2 on the reverse side
C - K3 clutch oil channel
D - Piston B2 oil channel on the shift side
Assembling the Piston Guide and Outer Bearing of the B2 Multi-Disc Brake
2 - Transmission housing
14a - Outer brake support B2, (piston B3)
32 - Piston guide
Cross section of brake B1
14a - External brake support B2; 27 - Piston B2; 134a - Outer disk (6.5 mm thick); 134b - Outer disc (1.8 mm thick); 134s - Outer disk (1.8 mm thick); 134d - Friction discs; 134e - Disc spring; 144a - Retaining ring; L - Gap
Disassembly
1. Remove retaining ring 134a.
2. Remove the B2 brake disc assembly 134 and disc spring 134b from the B2 outer brake support.
3. Install puller 074 on disc spring 29 and compress it until the circlip groove is free.
4. Remove retaining ring 31.
5. Remove spring plate 30 and disc spring 29.
6. Disconnect the guide ring 28 of the piston and the brake piston B2 27 from the piston B3 14a by supplying compressed air to port D.
7. Press guide ring 28 off piston B2 27.
8. Remove guide 32 from piston B3 14a by blowing compressed air into port A.
Assembly
1. Install guide 32 and piston B3 14a in the correct position. To do this, insert guide 32 into transmission housing 2 and tighten. Press the outer brake support B2 14a all the way into the guide 32. The undercut on the splines or the cutout on the outer brake support B2 14a must be directed downwards (arrow).
2. Insert brake piston B2 27 into brake piston B3 14a. The rounded ends of the O-rings 14c, 28a and 28b must point outward. The rounded end of the O-ring 14d must point inwards.
3. Insert guide ring 28 of the piston. The valve 137 in the piston guide ring must be on top.
4. Insert disc spring 29 and spring plate 30.
5. Install puller 074 on disc spring 29 and compress it until the circlip groove is free.
6. Insert retaining ring 31.
7. Insert disc spring 134b and disc assembly 134 onto outer brake mount B2.
8. Install the VZ brake discs together in the order shown in illustration 109 and insert them one by one.
9. Install press 078 on outer disc 70c.
10. Compress the disc stack with a press until it stops until the marking ring is visible (small arrow).
11. Measure clearance L at three points between circlip 144a and outer disc 134a. The gaps in the multi-disc brake 82 are shown in the table.
12. Adjust the clearance with circlip 144a if necessary. Retaining ring thickness: 2.9, 3.2, 3.5, 3.8 and 4.1 mm.
13. Install circlip 134a.