Nexen QFB-2200 963999 - Manual (Page 7)

7 FORM NO. L-20297-C-0603
FRICTION FACING WEAR ADJUSTMENT
NOTE: Friction Facing wear adjustment is not required
for the DFB.
NOTE: When the QFB Friction Facings are worn to the
point of required adjustment, the gap between the
Cylinder and Piston will close, preventing brake engage-
ment.
1. Alternately and evenly remove the twelve Socket
Head Cap Screws (Item 12) and Lock Washers
(Item 15) (See Figure 6).
2. Remove the Piston (Item 6) to free the Shims (Item
16) (See Figure 6).
3. Remove one set of Shims (Item 16) (See Figure 6).
4. Measure the distance from the Shims (Item 16) to
the inner face of the Friction Plate (Item 19) (See
Figure 7).
NOTE: The distance between the face of the outer Shim
(Item 16) and the inner face of the Friction Plate (Item
19) must be as close to 1.443" [36.652 mm] as pos-
sible (See Figure 7).
5. Repeat the previous step until the 1.443" [36.652
mm] distance is achieved (See Figures 6 and 7).
NOTE: Save the Shims (Item 16) that have been re-
moved for use when new Friction Facings are installed.
6. Apply a drop of Loctite ® 242 to the threads of the
twelve Socket Head Cap Screws (Item 12) (See
Figure 6).
7. 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 6).
8. Alternately and evenly tighten the twelve Socket
Head Cap Screws (Item 12) to 89 ft-lb [120.67
Nm] torque (See Figure 6).
Figure 6
2
16
6
15
12
Figure 7
The distance between the face of the outer
Shim (Item 16) and the inner face of the
Friction Plate (Item 19) must be as close to
1.443 inches [36.652 mm] as possible.