Nexen SPC 837400 - Manual (Page 13)

13 FORM NO. L-20095-U-1112
Shoe
Pins
(Item 8)
Spring
(Item 14)
Friction Facing
Shoe Assembly
(Items 5, 6, and 15)
Low Torque
Arm (Item 3)
High Torque
Arm (Item 4)
Cap Screws
(Item 24)
Thrust Bearings
(Item 12)
Retaining Plate
(Item 13)
Bearings
(Item 11)
Pivot Pin
(Item 2)
Bearing
(Item 10)
Frame
(Item 1)
Figure 12
Retaining Plate
(Item 13)
BEARINGS
1. Manually release the spring actuators (See Figure
12).
2. Apply hold-off air pressure. This will remove any tension
on the Tap Bolt for easier release.
Note
Before performing step three, determine the actuator
type and select either step 3a or 3b. Step four returns
to general instructions used for both models.
o
bSolete
t
hree
-P
ort
a
ctuator
o
nly
3a. Using a 9/16 inch socket wrench, turn the tap
bolt counterclockwise until the brake is released
(approximately 40 turns). Hold-off air pressure can
be removed at this time and service performed.
t
wo
-P
ort
a
ctuator
o
nly
3b. Using a 3/4 inch socket, turn the tap bolt
counterclockwise to fully cage (compress) the spring.
The spring is fully compressed when the bolt is backed
out of the unit 21mm [0.83 inches].
4. Remove the Spring (Item 14) (See Figure 12).
5. Remove the Shoe Pins (Item 8), and Friction Facing
Shoe Assembly (Items 5, 6, and 15) (See Figure
12).
6. Remove the three Cap Screws (Item 24) (See Figure
12).
7. Remove the top Retaining Plate (Item 13) (See Figure
12).
8. Remove the Low Torque Arm (Item 3) containing one
old Thrust Bearing (Item 12) and the High Torque Arm
(Item 4) containing the second old Thrust Bearing (Item
12) out of the Pivot Pin (Item 2) (See Figure 12).
9. Remove the two old Thrust Bearings (Item 12) from
the Torque Arms (Items 3 and 4) (See Figure 12)
10. Press the old Bearings (Items 10 and 11) out of the
Arms (Items 3 and 4).
11. Press new Bearings (Item 10 and 11) into the Arms
(Items 3 and 4) (See Figure 12).
12. Install the new Thrust Bearings (Item 12) (See Figure
12).
13. Reinstall the Low Torque Arm (Item 3) containing one
new Thrust Bearing (Item 12) and the High Torque Arm
(Item 4) containing the second new Thrust Bearing (Item
12) onto the Pivot Pin (Item 2) (See Figure 12).
14. Reinstall the top Retaining Plate (Item 13) (See Figure
12).
15. Reinstall the three Cap Screws (Item 24) (See Figure
12).
16. Tighten the Cap Screws (Item 24) to 34-44 Nm [25-
33 ft-lb] torque.
17. Reinstall Friction Facing Shoe Assembly (Items 5, 6,
and 15) and Shoe Pins (Item 8) (See Figure 12).
18. Reinstall the Spring (Item 14) (See Figure 13).
Note
The Frame (Item 1) and Pivot Pin (Item 2) must be
flush on the bottom before installing the Retaining
Plates (Item 13) and the Cap Screws (Item 24).