Specifications

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ORC SERIES, MODEL S CLUTCHES

ORC Series, Model S

BOSTON GEAR

II. MOUNTING SPROCKETS OR SHEAVES

TO CLUTCH

A. Type T Housing (Refer to Figure 7)

1. Inspect mating pilots on clutch and sprocket or

sheave for nicks or burrs and remove as required.

2. Position sprocket or sheave on housing and align

dowel pin holes.

3. Attach sprocket or sheave to housing with mounting

bolts and high collar lock washers. Refer to Table 1

for recommended seating torques.

4. Finish ream sprocket or sheave for dowel pin. Refer

to Table 1 for dowel pin and recommended ream

sizes.

5. Install dowel pins to a point where they bottom in

housing.

B. Type B Housing

A Type B is a basic unit and is sold without any

mounting hole arrangement. It is modified by the

customer for special applications. Refer to Figure 8.

TABLE 1 - SPROCKET MOUNTING SCREW SEATING TORQUES

Screw Dowel Seating Ream

Size

Qty.

Size

Qty.

Torque Size

1 1/4-20 3 1/4 1 150 in-lb .2495

2 5/16-18 3 5/16 1 305 in-lb .3120

3 3/8-16 4 3/8 1 545 in-lb .3745

4 1/2-13 4 1/2 1 1,300 in-lb .4995

5 5/8-11 6 5/8 1 2,530 in-lb .6245

6 5/8-11 6 5/8 1 2,530 in-lb .6245

FIGURE 6

If the torque output of the

clutch is altered, it may be

necessary to adjust the

actuating mechanism. This

is accomplished by first

disengaging the clutch,

then removing access plug

#5 and inserting an allen

wrench into the actuating

adjusting screw #29. (Refer

to Table 5 for wrench

sizes). Rotate adjusting

screw #29 until the spring

pressure applied by the

actuating spring #28

against the actuating stud

nut #39 is sufficient to

release the actuating

plate #31. The

adjustment should then

be tested by resetting the

clutch and then

disengaging it. If the

adjustment is correct, the

actuating plate will

release at the exact time

of clutch disengagement.

Replace plug #5.

LIMIT SWITCH ACTUATING MECHANISM (LSAM)

TABLE 2 - MINIMUM NUMBER OF TEETH OF STANDARD PLATE SPROCKETS ADAPTABLE TO TYPE T CLUTCH

CHAIN SIZE AND PITCH

#25 #35 #40 #41 #50 #60 #80 #100 #120 #140 #180

Clutch

1/4 3/8 1/2 1/2 5/8 3/4 1 1-1/4 1-1/2 1-3/4 2

Size

Pitch Pitch Pitch Pitch Pitch Pitch Pitch Pitch Pitch Pitch Pitch

1 4028222218 — — — — — —

2 5436282822 19 — — — — —

3 X 45 34 36 28 25 19 — — — —

4XX424536302319— ——

5XXXX4236302219 17—

6 — — X X X 48 36 30 24 21 19

Notes:

1. X - On Application Only.

2. For smaller sprockets consult factory. As in most cases, a design modification can be made.

5 Adjustment

Access Plug

35 Release Ring

31 Actuating Plate

32 Trip Pin

38 Return Spring

39 Actuating Stud

Nut

28 Actuating Spring

29 Actuating

Adjusting Screw

30 Spring Mounting

Screw

43 Spring Terminal