Nexen QFB-2500 964086 - Manual (Page 10)

10 FORM NO. L-20117-F-0210
PARTS REPLACEMENT
Refer to Figures 9 & 10.
NOTE: Friction Facings must be replaced when the gap
between the Cylinder and Piston is approximately
1/32" after the Friction Facing wear adjustment
has been made.
1. Alternately and evenly remove and discard the old Socket
Head Cap Screws (Item 12) and Lock Washers (Item
15).
2. Remove the Shims (Items 16,17, and 18), keeping them
in proper sequence for reassembly.
3. Remove spring loaded actuator assembly (Items 5-10,
13, and 14).
NOTE: DFB Series Brakes contain one Drive Disc
Assembly (Item 4) and one Friction Plate (Item
19). QFB Series Brakes contain two Drive Disc
Assemblies (Item 4) and two Friction Plates
(Item 19).
4. Remove Friction Plate (Item 19) and Drive Disc Assembly
(Item 4).
NOTE: The Flat Head Screws are assembled with
a micro-encapsulated two part epoxy thread
locking system. If removal is difficult, strike
the end of the screwdriver with a hammer to
break the crystalline structure or the compound
before attempting to remove the Flat Head
Screws.
5. Remove Flat Head Screws (Item 11) securing Friction
Facings (Item 3).
6. Install the new Flat Head Screws (Item 11) and new
Friction Facing (Item 3) into Housing (Item 2). Tighten
Flat Head Screws to recommended torque (See Table
6).
7. Alternately and evenly loosen the old Socket Head Cap
Screws (Item 8) to relieve spring tension on Pressure
Plate (Item 7).
8. Remove and discard the old Socket Head Cap Screws
(Item 8) and Lock Washers (Item 10).
TABLE 6
FIGURE 10
18 17 16
5
13
12
15 6
9
14
8
10
7
19
4 3
FIGURE 9
17 18 12 16 6 15
L E D O M 8 M E T I 1 1 M E T I 2 1 M E T I
P A C 1 1 - 8 / 5
S W E R C S
0 5 1 1 - B F D
0 5 1 1 - B F Q
. s b L /. n I 4 4 2 . s b L /. t F 2 2 - 0 2 . s b L /. t F 9 8 . s b L /. t F 5 4 1
0 5 6 1 - B F D
0 5 6 1 - B F Q
. s b L /. n I 5 3 4 . s b L /. t F 2 2 - 0 2 . s b L /. t F 9 8 . s b L /. t F 5 4 1
0 0 2 2 - B F D
0 0 2 2 - B F Q
. s b L /. n I 5 3 4 . s b L /. t F 2 2 - 0 2 . s b L /. t F 9 8 . s b L /. t F 5 4 1
0 0 5 2 - B F D
0 0 5 2 - B F Q
. s b L /. n I 5 3 4 . s b L /. t F 2 2 - 0 2 . s b L /. t F 9 8 . s b L /. t F 5 4 1
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.