Specifications

ORC SERIES, MODEL S CLUTCHES
1
ORC Series, Model S
BOSTON GEAR
BOSTON GEAR
®
ORC SERIES
TRIG-O-MATIC™
OVERLOAD RELEASE CLUTCHES –
STANDARD MODEL S
INSTALLATION AND MAINTENANCE
INSTRUCTIONS
I. INTRODUCTION
A. Operating Principle
The ORC Series, Model S Overload Release Clutch
consists of two basic components: the rotor and the
housing assembly. The clutch rotor is keyed and
secured to a shaft with a setscrew.
The housing assembly includes a drive pawl and a reset
pawl which are pivoted within the clutch housing. The
drive pawl is held engaged in the rotor notch by the
combined compression of the drive and reset springs as
shown in Figure 1. The combined compression of these
two springs determines the maximum torque which will be
transmitted without overload. With the clutch in the
engaged position shown in Figure 1, the rotor and the
housing are held together and the entire unit rotates with
the drive shaft at the same speed.
TABLE OF CONTENTS
I. Introduction
A. Operating Principle
B. Resetting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
C. Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Il. Mounting Sprockets or Sheaves to Clutch
A. Type T Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4
B. Type B Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4
Ill. Locating and Mounting Clutch and Couplings to Shaft
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Mounting the Basic Clutch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
C. Mounting Type “C” Flexible Coupling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
D. Mounting Type “N” Index and Type “R” Rigid Coupling . . . . . . . . . . . . . . 7
IV. Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
V. General Maintenance
A. Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
B. Annual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Vl. Repair Instructions
A. General Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
B. Basic Unit Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
C. Torque Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
D. Limit Switch Actuating Mechanism Assembly . . . . . . . . . . . . . . . . . . . . . 11
Catalog Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13, 15
Exploded View Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12, 14
FIGURE 1 ENGAGED
Housing
Limit Switch Pin
Retracted
Reset Spring
Drive Pawl
Engaged With
Rotor
Rotor
Drive Spring