Specifications

Feeler Gage
ORC SERIES, MODEL S CLUTCHES
7
ORC Series, Model S
BOSTON GEAR
BOSTON GEAR
®
c. If a correction is required to satisfy angular
alignment requirements, then recheck the parallel
alignment.
D. Mounting the “N” Index Coupling and Type “R” Rigid
Coupling
1. After the clutch has been mounted on its shaft as
explained in Section lll, inspect mating pilots of clutch
and coupling for any nicks or burrs and remove any
that are present.
2. Inspect coupling shaft and key for any nicks or burrs
and remove any that are present.
3. In the case of a Type “R”, make sure that the
coupling shaft keyway is in alignment with the clutch
shaft keyway. Position the shaft key and slide the
coupling flange onto the shaft.
4. Slide the coupling onto the clutch housing making
sure that the coupling pilot fits into the housing pilot
and that the mounting holes are aligned. In the case
of a Type “N” index coupling, make sure that the
desired mounting slots are aligned with the clutch
housing mounting holes.
5. Secure the coupling to the drive shaft by tightening
the two setscrews located in the hub of the flange.
Refer to Table 7 for recommended setscrew seating
torques.
6. Parallel Alignment
a. Place a straightedge across the clutch housing
and coupling flange as shown in Figure 13.
b. Measure the offset around the periphery of these
two components without rotating the shafts.
c. The shafts must be aligned until no offset exists or
is equal at all points around the periphery.
7. Angular Alignment
a. Measure the gap around the periphery between
the coupling flange and clutch housing without
rotating the shafts. Refer to Figure 14.
b. The shafts must be aligned until no gap exists or
is equal at all points around the periphery.
c. If a correction is required to satisfy angular
alignment requirements, then recheck the parallel
alignment.
Note:
The Type “N” and “R” coupling connection is
rigid and does not allow for forgiveness of
parallel or angular misalignment. To eliminate
unnecessary bearing loads, both shafts must be
in near perfect alignment.
8. Loosen the coupling setscrews and attach coupling
to clutch with hex head bolts and flat washers. Refer
to Table 9 for recommended bolt seating torques.
Secure coupling to drive shaft by tightening the
setscrews to the recommended seating torques in
Table 7.
TABLE 8 - TYPE “C” MISALIGNMENT
Maximum Allowable Misalignment
Size
Parallel Angular
1 .012” .074”
2 .015” .091”
3 .016” .102”
4 .027" .159”
5 .031" .183”
6 .045” .231”
TABLE 10 - COUPLING MOUNTING BOLT SEATING TORQUES
Size Bolt Size Seating Torque
1 5/16-18 160 in-lb
2 3/8-16 280 in-lb
3 1/2-13 700 in-lb
4 5/8-11 1,200 in-lb
5 5/8-11 1,200 in-lb
6 5/8-11 1,200 in-lb
FIGURE 14