Specifications

ORC SERIES, MODEL S CLUTCHES
ORC Series, Model S
10
BOSTON GEAR
BOSTON GEAR
®
4. Remove the drive pawl (10). The drive pawl and the
drive spring (18) will have to be installed
simultaneously. If a drastic change in torque is
desired, use this step to change the drive spring.
Place one end of the drive spring over the drive
spring thrust washer (22). Insert the knob of the drive
pawl into the other end of the drive spring. Insert the
trunnion of the drive pawl into the hardened bushing
in the housing, while the nose of the drive pawl fits
into the notch of the rotor (12).
5. Coat the inside of the housing and all components
with a quality all-purpose grease. A Bentone type,
NLGI grade 0 grease or equivalent is recommended.
6. Insert the reset spring disc (15) inside the reset
spring screw (14). Apply grease to the surface of the
disc.
7. If a drastic change in torque is desired, use this step
to change the reset spring. Place the reset spring
(19) on the surface of the reset spring disc. Apply
grease to the end of the ball thrust (20) and insert
ball thrust into the reset spring.
8. Apply grease to the threads of the reset spring screw
(14) and insert the assembly of the reset spring
screw, reset spring disc (15), reset spring (19), and
ball thrust (20) through the hole stamped 9 on the
housing. Tighten the reset spring screw until it is
flush with the surface of the housing (Figure 17).
9. Fill the entire housing cavity with grease to ensure a
proper grease packing.
10. Press the cover on to the housing assembly. Make
sure that the trunnion holes and the cover screw
holes line up.
11. Install the cover screws and tighten to the
recommended seating torques in Table 13.
C. Torque Verification
1. Place the clutch in a chuck or vise with the cover
facing upward.
2. Insert the appropriate size arbor and key into rotor
(see Figure 18).
3. Turn the drive spring screw (21) clockwise until it is
flush with the surface of the housing.
4. The clutch is supplied with a torque selector dial. The
torque selector dial is the mill marks located at the
hole stamped 9 on the housing. If a drive spring (18),
reset spring (19), and/or a reset spring screw (14)
were replaced, chances are that the stamped torque
values on the dial are no longer valid. It may be
necessary to grind the old numbers off and to stamp
new ones.
5. Tighten the reset spring screw (14) until it reaches
the limit stop pin (4). This will be the maximum torque
position. If the maximum torque is not desired,
tighten the reset spring screw to one of the locations
on the torque selector dial.
6. Disengage the clutch with a torque wrench. Fine tune
the torque by turning the drive spring screw (21) until
the desired release torque is obtained.
7. Refer to Section I, C for further details on torque
adjustment.
8. Once the desired release torque is obtained, tighten
the locking screws (25) located over the drive spring
and reset spring screws to ensure that they will not
move. The unit is now ready for installation. Refer to
Section lll for installation of basic clutch.
TABLE 13 - COVER SCREW SEATING TORQUES
Clutch Screw Seating
Size Size
Qty.
Torque
1 1/4-20 3 100 in-lb
2 5/16-18 3 200 in-lb
3 3/8-16 3 350 in-lb
4 1/2-13 4 850 in-lb
5 5/8-11 4 1,700 in-lb
6 5/8-11 4 1,700 in-lb
Torque Wrench
Arbor
Trig-O-Matic Clutch
Vice or Chuck Jaws
FIGURE 18