DE-STA-CO Ferguson Rite-Torq Torque Limiters (Overload Clutches) Type RT, RTM, RTL, RTL-FCB - Manual (Page 4)

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Application Recommendations
1. On applications other than the output of an IMC Index Drive, clutch speeds must not exceed 100
RPM.
2. High humidity, contaminants, or wash down applications may require special protection. If rust forms
within the clutch, it may act as a solid coupling and will not release under overload conditions.
Lubricate every six months or more frequently as the application requires.
3. Use bronze bushings on sprockets, dials, gears or pulleys when used at the high end of the speed
range (100 RPM) to reduce wear.
4. Clutch couplings require accurate shaft alignment of .003" TIR. Insure that a clearance gap is
maintained between the body and the drive plate around the full circumference to the clutch (Type
RT S/S).
5. Use flange mounted clutches and clutch couplings whenever possible. These models provide
superior mounting reliability (Type RT F/F or D).
6. Dowel pins should not protrude from the drive plate or driven members, as they may lock against the
adjacent surface.
7. Do not operate without the detector limit switch electrically disconnecting the prime mover (motor),
as galling of the contacting surfaces may result.
8. On high inertia applications, braking the prime mover is recommended in the dwell cycle of the
INDEX DRIVE to minimize over travel.
9. IMC recommends using limit switches with rated travel not exceeding .008" for actuation.
10. The torque required to re-engage the clutch is usually 25% of the rating. Contact IMC for special
design, anti-friction materials if the clutch is to be used with very low torque settings.
11. Never use the clutch with a torque setting close to the calculated operating torque. Actual torques
may be higher. Torque spring tolerances and coefficients of friction vary with temperature and
application. Allow 130% (1.3 service factor) when applying a FERGUSON clutch.
Requesting Service
Call our Technical Service Department in Wheeling, IL, USA at 800-645-5207 or 847-459-5200 between
8:00AM and 4:30PM CST. When requesting service, always provide the following information:
1. The model number of the torque limiter.
2. A clear description of the problem, including as much detail as possible of the circumstances leading
up to the problem.