RATCHET TORQUE LIMITER
This device is designed to keep shock loads within specified limits. It elastically transmits the desired torque, absorbing overloads by temporarily slipping. When it slips, it is necessary to stop the PTO in order to avoid excessive wear. It is mounted on the implement side.
SHEAR BOLT TORQUE LIMITER
This device prevents overloading by means of a shear bolt of specified size. When the bolt shears off, the hub and yoke assembly is kept together by a ball bearing ring which allows the two parts to rotate independent of each other. It is mounted on the implement side.
FRICTION TORQUE LIMITER
It prevents overloading when the preset torque is reached. Since the torque continues to be transmitted, no interruptions of work are necessary. External springs allow torque setting to be adjusted easily. It is mounted on the implement side.
This device transmit power in a pre-selected direction of rotation. It is recommended for those machines which, when suddenly stopped, are subject to a large inertia force. It is mounted on the implement side. If another safety device is fitted to the same drive shaft, then the RL overrunning clutch should be mounted on the tractor side.