Disassembly and assembly of the multi-disc brake B1
6b - Outer brake support B1; 6s - Piston; 6d - Piston return disc spring; 6f - Disc spring of the disc block; 6g - Block of gears; 6e, 6h - Retaining rings; 073 - Puller; A - Brake oil channel B1
Cross section of brake B1
6b - Outer brake support B1; 6s - Piston; 6f - Disc spring; 6h - Retaining ring; 69 - Friction discs; 70a - Outer disk 1.8 mm thick; 70b - 3.5mm outer disc/new 2.8mm disc; 70s - Outer disk 4.0 mm thick; «L» - Clearance
Disassembly
1. Remove retaining ring (6h).
2. Remove the drive unit (6g) and disc spring (6f) from an external support.
3. Install the puller (073) on disc spring (6d) and squeeze it until the groove for the retaining ring is released.
4. Remove retaining ring (6e).
5. Remove the piston (6s) from the outer support while gently blowing air into port A.
Assembly
1. Install the piston (6s) to the outer support.
2. Install disc spring (6d).
3. Install the puller (073) on disc spring (6d) and compress it until the retaining ring (6e) will not fit into the groove.
4. Insert retaining ring (6e).
5. Insert disc spring (6f) and disk block (6g) on the outer support and measure the clearance L. Insert brake discs B1 together in the order shown in the accompanying illustration and install them one by one.
6. Install the press (078) to an external drive (70s).
7. Squeeze the disc stack until it stops (until the marking ring is visible) (small arrow).
8. Measure clearance «L» between snap ring (6h) and outer disc (70s) at three points. The gaps in the multi-disc brake B1 are shown in table 1.
9. Adjust the gap with the retaining ring (6h), if it is needed.
Retaining ring thickness: 2.6, 2.9, 3.2, 3.5, 3.8 and 4.1 mm.
10. Install retaining ring (6h).