Nexen MWCB 830812 - Manual (Page 18)

18
FORM NO. L-20016-X-1209
NOTE
The following sections are arranged by model. Verify that you are in the correct section for your model.
15. Remove the old Flat Head Machine Screws (Item 24) and
Friction Facing (Item 4) from the Piston (Item 3).
16. Remove the Shoulder Bolts (Item 5), Shoulder Bolt O-Rings
(Item 22), and Compression Springs (Item 6).
17. Separate the Piston Air Chamber (Item 7) and Piston (Item
3).
18. Remove the old O-Ring Seals (Items 18 and 20) from the
Piston Air Chamber (Item 7) and Piston (Item 3).
19. Remove the Retaining Ring (Item 17).
20. Press the old Ball Bearing (Item 13) out of the Piston Air
Chamber (Item 7).
21. Clean the bearing bore of the Piston Air Chamber (Item 7)
with fresh safety solvent, making sure all old Loctite ® residue
is removed.
22. Apply an adequate amount of Loctite ® 680 to evenly coat
the outer race of the new Ball Bearing (Item 13).
23. Carefully align the O.D. of the new Ball Bearing (Item 13)
with the bore of the Piston Air Chamber and press the new
Ball Bearing into place.
24. Reinstall the Retaining Ring (Item 17).
25. Clean all O-Ring grooves and O-Ring contact surfaces with
fresh safety solvent and lubricate the O-Ring grooves and
contact surfaces with fresh O-Ring lubricant.
26. Lubricate the new O-Ring Seals (Items 18, 20, and 22) with
fresh O-Ring lubricant and install the new O-Ring Seals.
27. Press the Piston (Item 3) into the Piston Air Chamber (Item
7).
28. Apply Loctite ® 242 to the threads of the Shoulder Bolts (Item
5); then, install the new Compression Springs (Item 6) and
Shoulder Bolts (Item 5) with new O-Rings Seals (Item 22).
29. Tighten the Shoulder Bolts (Item 5) to 205 In. Lbs. [23.1 Nm]
torque.
30. Install the new Friction Facing (Item 4) and tighten the new
Flat Head Machine Screws (Item 24) to 43 In. Lbs. [4.8 Nm]
torque.
REASSEMBLy—PILOT, COUPLING, AND SHEAVE MOUNT
FWCB
Refer to Figures 25 - 28.
1. Press the Brake Assembly onto the Hub (Item 1) and reinstall
the Retaining Ring (Item 37).
2. Slide the Brake Friction Disc (Item 2) onto the Hub and install
the Locking Nut (Item 26).
3. Reinstall and tighten the Set Screws (Item 29) to 20 In. Lbs.
[2.2 Nm] torque.
FIGURE 24
7
20
3
13
17
6
5
22
4
24
18
FIGURE 25
Brake
Assembly
37
1
12
26
29
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
4. Lubricate the new O-Ring Seals (Items 19 and 21) with fresh
O-Ring lubricant; then, install the new O-Rings Seals onto
the Brake and Clutch Assemblies.
5. Reinstall the Key (Item 15).
PARTS REPLACEMENT—PILOT, COUPLING, AND SHEAVE MOUNT (continued)