Nexen BD 933617 - Manual (Page 9)

9
FORM NO. L-20271-F-0609
FIGURE 11
ACTUATOR
8
1. Disconnect the hydraulic supply from the Actuator and
plug the hydraulic ports in the Actuator.
CAUTION
The Actuator is spring loaded. Always wear safety
goggles when working with spring loaded devices.
NOTE
This BD Caliper Brake is spring engaged and hydrau-
lically disengaged. To release the spring pressure,
remove the Vent, then lubricate and insert a Grade 5,
3/8-16 x 9'' Threaded Rod into the back of the Actuator;
then, using a Flat Washer and Nut, tighten the Nut to
release the spring pressure (See Figure 11 and Insert B).
A Manual Release Kit (Product No. 933596) containing
these items is available from Nexen.
1,500 Lbs. [6,672 N] of force is required to compress
the Belleville Washers.
2. Loosen the Spanner Nut (Item 12) locking the Actuator
to the BD Caliper Brake and remove the Actuator.
3. Remove the six Socket Head Cap Screws (Item 10) (See
Figure 11).
4. Slowly release the pressure on the Actuator by unscrew-
ing the Nut in the Threaded Rod.
5. Separate the Rear Cylinder (Item 3) and the 36 Belleville
Disc Springs (Item 8) from the front half of the Actuator
(See Figure 11).
6. Push the Piston (Item 1) out of the Front Cylinder (Item
2) and Cylinder Head (Item 12) (See Figure 11).
7. Separate the Cylinder Head (Item 12) from the Front
Cylinder (Item 2) and remove the old Wiper Seal (Item
4) (See Figure 11).
8. Press a new Wiper Seal (Item 4) into the Cylinder Head
(Item 12).
9. Remove the Small Washer (Item 15) and old Rod Seal
(Item 6) from the Front Cylinder (Item 2) (See Figure
11).
NOTE
The Rod Seal (Item 6) is coated with a special compound.
Avoid excessive handling of the Rod Seal.
10. Press a new Rod Seal (Item 6) into the Front Cylinder
(Item 2) (See Figure 11).
WARNING
Special attention should be exercised when working
with retaining rings. Always wear safety goggles
when working with spring or tension loaded fasteners
or devices.
NOTE
Be careful not to scratch the Piston (Item 1) when re-
moving or installing the Retaining Ring (Item 11).
11. Remove the Retaining Ring (Item 11) from the Piston
(Item 1) (See Figure 11).
12. Remove the Large Washer (Item 14) and the old Piston
Seal (Item 5) from the Piston (Item 1) (See Figure 11).
NOTE
The Piston Seal (Item 5) is coated with a special com-
pound. Avoid excessive handling of the Piston Seal.
13. Install a new Piston Seal (Item 5) and Large Washer (Item
14) onto the Piston (Item 1).
14. Reinstall the Retaining Ring (Item 11).
INSERT A
Belleville Washers
stacked in serie s
18
12
4
15
6
2
11
14
5
1
17
10 INSERT B
3
16
Actuator Grade 5
3/8-16x9"
Threaded Rod
Flat
Washer
Nut