Contents: Disassembly ↡ Assembly ↡
14a - Outer brake support B2 or piston B3; 14b-d - Brake sealing rings B3; 27 - Brake piston B2; 28 - Piston guide ring; 28a-b - Sealing rings on the piston guide ring; 29, 134b - Disc springs; 30 - Spring plate; 31, 134a - Retaining rings; 32 - Brake piston guide B2 and B3; 32a - Sealing ring; 134 - Disk block
31 - Retaining ring; 074 - Puller
27 - Piston; 28 - Piston guide ring; 137 - Valve
A - Oil channel of piston B3; B - Oil channel of piston B2 from the back side; C - Clutch oil channel K3; D - Oil channel of piston B2 on the gearshift side
Assembly of piston guide and outer support of multi-disc brake B2
2 - Transmission housing; 14a - Outer brake support B2, (piston B3); 32 - Piston guide
Section of the Brake B1
14a - Outer brake support B2; 27 - Piston B2; 134a - Outer disk (6.5 mm thick); 134b - Outer disk (1.8 mm thick); 134c - Outer disk (1.8 mm thick); 134d - Friction discs; 134e - Disc spring; 144a - Retaining ring; L - Gap
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Disassembly
1. Remove the retaining ring (134a).
Parameters | ||
| Clearance in multi-disc brake B1, mm | Disc 2 | 1,90-2,30 |
Disc 3 | 2,00-2,40 | |
Disc 4 | 3,00-3,40 | |
2. Remove the brake disc assembly B2 (134) and disc spring (134b) from the outer brake support B2.
3. Place the puller (074) on the disc spring (29) and compress it until the groove for the snap ring is released.
4. Remove the retaining ring (31).
5. Remove the spring plate (30) and disc spring (29).
6. Disconnect the piston guide ring (28) and the brake piston B2 (27) from the piston B3 (14a) by applying compressed air to hole D (refer to the accompanying illustration).
7. Press the guide ring (28) off piston B2 (27).
8. Remove the guide (32) from piston B3 (14a) by supplying compressed air to hole A.
Assembly
1. Set the guide (32) and piston B3 (14a) in the correct position. To do this, insert the guide (32) into the transmission housing (2) and tighten. Press the outer brake support B2 (14a) until it stops in the guide (32). The recess on the splines or the cutout on the outer brake support B2 (14a) must be directed downwards (arrow).
2. Insert the B2 brake piston (27) into the B3 brake piston (14a). The rounded ends of the sealing rings (14c), (28a) and (28b) must face outward. The rounded end of the sealing ring (14d) must face inward (refer to accompanying illustration 17.1).
3. Insert the piston guide ring (28). The valve (137) in the piston guide ring must be on top.
4. Insert the disc spring (29) and spring plate (30).
5. Place the puller (074) on the disc spring (29) and compress it until the groove for the snap ring is released.
6. Insert the retaining ring (31).
7. Insert the disc spring (134b) and disc block (134) onto the outer brake support B2.
8. Fit the B3 brake discs together in the order shown in the illustration (109) and insert them one by one.
9. Install the press (078) on the outer disk (70c).
10. Compress the disc block with a press until the stop until the marking ring is visible (small arrow).
11. Measure the clearance L at three points between the retaining ring (144a) and the outer disc (134a). The clearance values in the multi-disc brake (B2) are given in the table.
Parameters | ||
| Clearance in multi-disc brake B2, mm | Disc 4 | 1.90-2.30 |
Disc 5 | 2.00-2.40 | |
12. Adjust the clearance with the stop ring (144a) if necessary. Stop ring thickness: 2.9, 3.2, 3.5, 3.8 and 4.1 mm.
13. Install the retaining ring (134a).