Installation – Nexen BD 933702 User Manual
Page 4
4
FORM NO. L-21098-C-0609
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 Class 8.8 M10-
1.5 x 5.5'' 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. 933710) 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.
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.
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
TABLE 1
PULL-UP BOLT TOrQUES fOr NON-VENTILATED DISCS
S
E
U
Q
R
O
T
G
N
I
N
E
T
H
G
I
T
D
E
D
N
E
M
M
O
C
E
R
.
A
I
D
.
O
N
T
R
A
P
G
N
I
H
S
U
B
D
Q
E
U
Q
R
O
T
"
5
2
.
8
1
0
0
2
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
5
3
1
"
1
2
0
0
3
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
5
3
1
"
4
2
0
0
4
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
5
3
1
TABLE 2
PULL-UP BOLT TOrQUES fOr VENTILATED DISCS
S
E
U
Q
R
O
T
G
N
I
N
E
T
H
G
I
T
D
E
D
N
E
M
M
O
C
E
R
.
A
I
D
.
O
N
T
R
A
P
G
N
I
H
S
U
B
D
Q
E
U
Q
R
O
T
"
2
1
1
0
2
4
3
9
F
S
]
m
N
5
.
0
4
[
b
l-
tf
0
3
"
4
1
2
0
2
4
3
9
E
]
m
N
1
8
[
b
l-
tf
0
6
"
6
1
3
0
2
2
3
9
E
]
m
N
1
8
[
b
l-
tf
0
6
"
8
1
4
0
2
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
3
3
1
"
0
2
5
0
2
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
3
3
1
"
2
2
6
0
2
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
3
3
1
"
4
2
7
0
2
4
3
9
J
]
m
N
5
.
2
8
1
[
b
l-
tf
3
3
1