Nexen QFB-2200 963999 - Manual (Page 9)

9 FORM NO. L-20297-C-0603
NOTE: Reinsert the Shims (Item 16) removed when
performing Friction Facing wear adjustment (QFB only).
12. Apply a drop of Loctite ® 242 to the threads of the
twelve Socket Head Cap Screws (Item 12) (See
Figure 9).
13. Using the twelve Socket Head Cap Screws (Item
12) and Lock Washers (Item 15), secure the Piston
(Item 6) to the Housing (Item 2) (See Figure 9).
14. Alternately and evenly tighten the twelve Socket
Head Cap Screws (Item 12) to 89 ft-lb [120.67
Nm] torque (See Figure 9).
O-RING SEAL REPLACEMENT
NOTE: Refer to Figure 12 for the following procedure.
1. Alternately and evenly remove the twelve Socket
Head Cap Screws (Item 12), Lock Washers (Item
15), and Piston (Item 6) to free the Shims (Item 16).
2. Remove the Shims (Item 16).
3. Remove the Cylinder (Item 5), Piston (Item 6), and
Pressure Plate (Item 7).
7. Remove the old O-ring Seals (Items 13 and 14).
8. Lubricate O-ring contact surfaces and the new O-ring
Seals (Items 13 and 14) with fresh O-ring lubricant.
9. Install the new O-ring Seals (Items 13 and 14).
10. Install the new Compression Springs (Item 9).
11. Slide the Piston (Item 6) back into the Cylinder
(Item 5).
12. Apply a drop of Loctite ® 242 to the threads of the
twenty Socket Head Cap Screws (Item 8).
13. Using the twenty Socket Head Cap Screws (Item
8) and Lock Washers (Item 10), secure the
Pressure Plate (Item 7) to the Cylinder (Item 5).
14. Alternately and evenly tighten the twenty Socket
Head Cap Screws (Item 8) to 36.25 ft-lb [49.15
Nm] torque.
15. Reassemble the brake, installing the Shims (Item 16).
16. Apply a drop of Loctite ® 242 to the threads of the
twelve Socket Head Cap Screws (Item 12).
17. Using the twelve Socket Head Cap Screws (Item
12) and Lock Washers (Item 15), secure the Piston
(Item 6) to the Housing (Item 2).
18. Alternately and evenly tighten the twelve Socket
Head Cap Screws (Item 12) to 89 ft-lb [120.67
Nm] torque.
4. Alternately loosen the twenty Socket Head Cap
Screws (Item 8) and Lock Washers (Item 10) one-half
turn at a time until all spring pressure is relieved.
Once all twenty screws are loose and spring
pressure is relieved, it is possible to completely
remove the scres and Pressure Plate.
5. Remove the ten Compression Springs (Item 9) from
the Piston (Item 6).
6. Separate the Piston (Item 6) and Cylinder (Item 5).
Figure 12
5
14
13
12 15
6
9
7
10
8
16
2
The Pistom (Item 6) and Pressure
Plate (Item 7) are spring loaded
under extreme pressure. Always wear
safety goggles when working with
spring or tension loaded devices.
Failure to follow the disassembly
instructions listed below may result
in serious bodily harm or death.
DANGER