Here's How it Works:
Two stainless steel jaws ride in slots machined in the flange end of the tool’s housing. These jaws are held in position, just slightly larger than the flexible shafts drive square, by multiple spring assemblies which restrain the jaws from opening in values equal to the quantity of springs used.

If the cleaning tool jams in the tube deposit, the corners of the shaft drive square will push against the jaws and eventually separate them allowing the motor drive to spin separate from the shaft. Once the cleaning tool is dislodged from the deposit the shaft automatically starts spinning again. The more springs that you use.. the more pressure that is required to separate the jaws and vice versa.This clutch can be used in either clockwise or counterclockwise rotation and the springs can be either add or removed without disassembly of the drive unit.

Here’s How You Install TFI 555

Step 1 Remove set screws holding the drive unit cover to the housing and loosen 3 set screws securing the main drive shaft from the pulley and back bearing support.

Step 2 Slide shaft out front of manifold, punch retaining pin out of current shaft drive coupling, and replace with TFI 555 shaft sentinel & re-pin to main drive shaft.

Step 3 Reassemble unit. Start with 4 springs for ‘A” casing shaft applications. Adjust to suit.

Step 4 Replace existing flexible shaft drive coupling with enclosed harden coupling.