55 Series Torqmaster Overrunning Clutch Setscrew Yoke

55 series torqmaster overrunning clutch yoke with round with keyway bore and setscrew connection

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The Friction clutch is indispensable in certain agricultural implement applications. The friction clutch is the only torque limiter that has the ability to continuously transmit power (at a reduced level) while overloaded. This is valuable during startup of high inertia machines, as well as for leveling out torsional fluctuations due to high cyclic loads. The TorQmaster’s patented technology dissipates heat quickly, improving durability while protecting the machine. The TorQmaster clutch packs are preset for various power levels to meet the needs of the application while reducing torque overloads on the implement, n adjustment is required after slipping. The free-motion design allows for easy connection of the PTO Drive Shaft to the tractor PTO, the overrunning design adds to this also the ability for any implement to free-wheel to a stop. The TorQmaster overrunning clutch yoke must be used in conjunction with a mating TorQmaster overrunning Clutch and is easily mounted with standard tools.

• Implement overload protection.
• Isolates and dissipates heat minimizing downtime for higher productivity.
• Corrosion resistant friction discs.
• Minimal maintenance.
• Wear indicator tabs show when maintenance is needed.
• Tamper-resistant.
• Modular design offered with integral overrunning clutch option.
• Smooth operation, no damaging torque spikes.
• Torque transmission while slipping aids in dislodging plugs for increased productivity.
• Medium duty 7.00 in. Dia. (178 mm) and heavy duty 9.40 in. Dia. (239 mm) friction packs available.

• Clutch packs bolt to yoke and hub for easy service.
• Hub offered with or without free motion (patented) or overrunning options.
• Yoke options include most North American and European series.
• Slip surfaces are controlled to be against iron for efficient heat dissipation and reliable friction coefficient (patented).
• Fins are incorporated to quickly dissipate heat and isolate it from other components.
• Wear-compensating spring design allows the clutch friction discs to wear uniformly for extended life and maintain torque level.
• Torque protection level is determined by spring selection and verified for each assembly.
• Auto-lok attachment available (patented).
• Medium duty Torque settings available from 4000 to 18000 in•lb (450 to 2000 nm).
• Heavy duty Torque settings available from 8000 to 24000 in•lb (900 to 2700 nm).


Spec. Imperial Metric
Bearing Diameter1.53 inches39 mm
Bearing Span4.30 inches109 mm
Bore 11.37 inches35 mm
Connection 1 SETSCREW
HP@1000RPM211 HP157 kilowatts
HP@540RPM137 HP102 kilowatts
Keyway 10.31 inches8 mm
Length7.98 inches203 mm
Outside Diameter6.15 inches156 mm
Pin Hole 1.50
Setscrew 3/8-16
Shipping Dimensions9.06" L  ×  6.15" H  ×  6.15" W23cm L  ×  16cm H  ×  16cm W
Shipping Volume177.33 in32906 cm3
Shipping Weight13.06 pounds6 kilograms
Weight13.06 pounds6 kilograms


Document Name Type Language
Service Instructions - Lubricating PTO Drive Shaft.pdf Maintenance Document English
Service Instructions - TorQmaster Friction Clutch.pdf Maintenance Document English
Service Instructions - M Type Friction Clutch.pdf Maintenance Document English
Service Instructions - Universal Joint.pdf Service Document English
Service Instructions - M Type Friction Clutch.pdf Service Document English
Lack of Grease - Cross & Brg Kit.pdf Troubleshooting Document English
WE0101023_0817_USL_M-TypeFrictionClutch.pdf Performance Benefits Document English

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