1
FORM NO. L-20271-E-0300
ACTUATOR
NOTE
This BD Caliper Brake is spring engaged and
hydraulically 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 4). A
Manual Release Kit (Product No. 933596) containing
these items is available from Nexen.
The actuator may be mounted on either side of the
brake.
1.
Remove the Detent Pins (Item 16) to release the Shoes
(Item 3) and the Belleville Disc Springs (Item 29) (See
Figure 2).
NOTE
Two Belleville Disc Springs (Item 29) are compressed
between the Brake Arm (Item 2) and the Shoe (Item 3).
When the Shoe is removed, the Belleville Disc Springs
will fall free from the Brake Arms.
2.
Remove the Shoes (Item 3) and Belleville Disc Springs
(Item 29) (See Figure 2).
3.
Remove four Cap Screws (Item 24) (See Figure 2).
INSTALLATION
DISC
1.
Thoroughly inspect the tapered bore of the disc hub and
the tapered surface of the Q.D. bushing. Remove any dirt,
grease, or foreign material. Do not use lubricants for this
installation.
2.
Assemble the Q.D. bushing into the disc hub, aligning the
untapped holes in the bushing flange with the tapped
holes in the disc hub.
3.
Insert the pull-up bolts and alternately and evenly tighten
to the recommended torque (See Tables 1 and 2).
NOTE
Runout is minimized if a Dial Indicator is used as the
pull-up bolts are tightened. Place the contact tip of the
Dial Indicator on the machined surface of the rotor to
measure runout. Runout should be .010 - .015 In.
[2.5 - 3.8 mm] (See Figure 1).
CAUTION
If excessive tightening torque is applied, bursting
pressures are created in the hub. There must be a gap
between the flange of the Q.D. bushing and the disc hub
to ensure a proper press fit of the Q.D. bushing onto the
shaft.
Dial
Indicator
4.
Remove Pivot Pin Retaining Plate (Item 6) (See Figure 2).
5.
Press out Pivot Pins (Item 7) (See Figure 2).
6.
Slide Brake Arms (Item 2) out of Main Frame (Item 1) (See
Figure 2).
7.
Position the Brake Arms and Actuator as desired.
8.
Slide the Brake Arms (Item 2) back into the Main Frame
(Item 1) (See Figure 2).
24
24
2
6
1
7
16
29
3
7
16
29
FIGURE 2
3
FIGURE 1
4.
To remove the Q.D. bushing, remove the pull-up bolts and
reinsert into the threaded holes. Tighten the pull-up bolts
to push the disc hub off the Q.D. bushing.
RECOMMENDED TIGHTENING TORQUES
DIA.
PART NO.
QD BUSHING
TORQUE
12"
934201
SF
30 Ft. Lbs. [40.5 N m]
14"
934202
E
60 Ft. Lbs. [81 N m]
16"
932203
E
60 Ft. Lbs. [81 N m]
18"
934204
J
133 Ft. Lbs. [182.5 N m]
20"
934205
J
133 Ft. Lbs. [182.5 N m]
22"
934206
J
133 Ft. Lbs. [182.5 N m]
24"
934207
J
133 Ft. Lbs. [182.5 N m]
TABLE 1
PULL-UP BOLT TORQUES FOR NON-VENTILATED DISCS
RECOMMENDED TIGHTENING TORQUES
DIA.
PART NO.
QD BUSHING
TORQUE
18.25"
934200
J
135 Ft. Lbs. [182.5 N m]
21"
934300
J
135 Ft. Lbs. [182.5 N m]
24"
934400
J
135 Ft. Lbs. [182.5 N m]
TABLE 2
PULL-UP BOLT TORQUES FOR VENTILATED DISCS
®
DIST
. AUTORIZADO
MEX
(55) 53 63 23 31
QRO (442) 1 95 72 60
MTY (81) 83 54 10 18
ventas@industrialmagza.com
