Installation, Actuator, Disc – Nexen SPC 837400 User Manual
Page 5: Caution
5
FORM NO. L-20095-U-1112
4. To remove the Q.D. bushing, remove the pull-up bolts
and reinsert into the threaded holes in the Q.D. bushing.
Tighten the pull-up bolts to push the disc off the Q.D.
bushing.
ACTUATOR
Note
The Spring Actuator Assembly and the Air Actuator Assembly are sold separately. One or two Actuators can
be installed on the SPC Brake. When one Actuator is used, the brake torque will be higher if the Actuator is
mounted on the High Torque Arm (Item 4). When two Actuators are used on the SPC Brake, both Actuators
must be of the same type.
S
Pring
a
ctuator
1. Insert the Rod (Item 43), Jam Nut (Item 31), and Spacer
(Item 32) into the Actuator (See Figure 2).
Note
Mount this assembly on either the Low Torque Arm
(Item 3) or the High Torque Arm (Item 4) (See Figure
2).
2. Install the Cap Screws (Item 33) and the Lock Washers
(Item 34) (See Figure 2).
3. Tighten the Cap Screws (Item 33) to 64.5 Nm [48
ft-lb] torque.
Figure 2
Low Torque
Arm (Item 3)
Actuator
High Torque
Arm (Item 4)
Rod
(Item 43)
Jam Nut
(Item 31)
Spacer
(Item 32)
Cap Screws
(Item 33)
Lock Washers
(Item 34)
INSTALLATION
Dial
Indicator
Figure 1
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0
3
[
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4
1
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0
6
[
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0
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[
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5
3
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1
Table 1 (Non-Ventilated Discs)
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b
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[
m
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]
5
2
.
8
1
[
4
6
4
0
0
2
4
3
9
J
]
5
3
1
[
5
.
2
8
1
]
1
2
[
3
3
5
0
0
3
4
3
9
J
]
5
3
1
[
5
.
2
8
1
]
4
2
[
0
1
6
0
0
4
4
3
9
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]
5
3
1
[
5
.
2
8
1
Table 2 (Ventilated Discs)
DISC
1. Thoroughly inspect the tapered bore of the Disc Hub
and 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 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 contact tip of the
Dial Indicator on the machined surface of the Rotor
to measure runout. Runout should be less than 0.38
mm [0.015 inches] (See Figure 1).
Two-port actuator shown.
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.