Nexen MWCB 830812 - Manual (Page 6)

6
FORM NO. L-20016-X-1209
COUPLING MOUNT CLUTCH-BRAKE
Refer to Figure 2.
1. Determine the parallel misalignment of shafts to be coupled
by placing a straight edge across the shafts and measuring
the maximum offset at various points around the periphery
of the shafts. Make the necessary corrections to keep the
shafts within parallel misalignment limits of the clutch coupling
(See Table 2).
NOTE
Before installation, the driving shaft can be fixed but the
driven shaft must be allowed to “float”.
Align the air inlet ports to the six o’clock down position to
allow condensation to drain out of the exhaust port.
2. Insert the first Key (Item 30) into driven shaft.
3. Slide Clutch-Brake Assembly onto the driven shaft.
4. Insert second Key (Item 30).
5. Install and tighten Set Screws (Items 27 and 28) to the
recommended torque (See Table 3).
6. Attach the Coupling Adapter Plate (Item 24) to the Clutch-
Brake pilot using Cap Screws (Item 33) and Lock Washers
(Item 34); then, tighten the Cap Screws to the recommended
torque (See Table 3).
7. Place the Coupling’s Flexible Disc (Item 25) over the pins in
the Coupling Adapter Plate (Item 24).
8. Insert the customer supplied Dodge™ Taper-Lock Bushing
into the Coupling Hub (Item 26).
9. Align the holes (not the threads) and slide the Dodge TM Taper-
Lock Bushing Assembly onto the driving shaft until it is flush
with the shaft.
10. Thread the screws into threaded holes in the Dodge TM Taper-
Lock Bushing and Coupling Hub (Item 26); then, alternately
and evenly tighten the screws to the bushing manufacturer's
specifications.
11. Align the pins in the Coupling Hub (Item 26) with the holes
in the Flexible Disc (Item 25).
12. Push the entire assembly together. Automatic spacing is
accomplished by spacers molded into the Flexible Disc.
13. Fasten one of the ears of the Clutch-Brake to a fixed member
of the machine.
NOTE
The Piston Air Chamber (Item 7) floats laterally approxi-
mately 1/16 inch [1.59 mm] during operation. Make sure
the securing pin allows 1/16 inch to 1/8 inch [1.59 mm to
3.18 mm] movement.
TABLE 2
TABLE 3
RECOMMENDED TIGHTENING TORQUES
FIGURE 2
Driving
Shaft
Dodge TM
Taper-Lock
Bushing
Driven
Shaft
Clutch-Brake
30
30
27
28
26
25
34
33
24
Model Dodge™
Taper-Lock
Poly-Disk
Coupling
Size
Measured Variation
@ Points 180 o Apart
Axial Float
(Minimum
Value From
Recommended
Initial Spacing)
Parallel
Maximum
Angular
Maximum
FWCB 2-5/8 In.
[66.75mm]
0.015 In.
[0.381 mm]
0.040 In.
[1.016 mm]
+1/8 In.
[+1.375 mm]
LWCB 4 In.
[101.6 mm]
0.015 In.
[0.381 mm]
0.064 In.
[1.625 mm]
+1/8 In.
[+1.375 mm]
MWCB 7 In.
[177.8 mm]
0.015 In.
[0.381 mm]
0.112 In.
[2.845 mm]
+1/8 In.
[+1.375 mm]
HWCB 8 In.
[203.2 mm]
0.015 In.
[0.381 mm]
0.128 In.
[3.251 mm]
+1/8 In.
[+1.375 mm]
Description FWCB LWCB MWCB HWCB
Set Screw
(Item 27)
35 In. Lbs.
[3.9 N.m]
80 In. Lbs.
[8.9 N.m]
80 In. Lbs.
[8.9 N.m]
23 Ft. Lbs.
[3.9 N.m]
Set Screw
(Item 28)
20 In. Lbs.
[2.2 N.m]
20 In. Lbs.
[2.2 N.m]
80 In. Lbs.
[8.9 N.m]
— —
Cap Screw
(Item 33)
21 Ft. Lbs.
[28.5 N.m] 21 Ft. Lbs.
[28.5 N.m] 23 Ft. Lbs.
[31.2 N.m] 78 Ft. Lbs.
[105.8 N.m]
INSTALLATION
(continued)