The purpose of burnishing is to allow the two surfaces to become accustomed to each other before high RPM and load is applied while mowing, which increases the torque loading of the clutch. This insures better engagement of the clutch mating surfaces and prolongs clutch life.
To burnish a clutch, reduce the engine speed to about half. A typical burnishing time will take anywhere from 5 to 30 cycles depending upon inertia. The burnishing frequency should be done at 2 to 6 cycles per minute. Frequency of cycles and amount of cycles required will depend upon inertia. Typically the larger the...
By: Motion System Design|
Mostly, electric clutches and brakes run for hundreds of thousands of cycles with little watching. Overlook a few of their basic needs, however, and these normally unassuming devices can suddenly protest
Though clutches and brakes differ in purpose and application, for troubleshooting and problem-solving purposes their operating principles are similar. We focus here on positive-action units that are either electrically or mechanically actuated (“spring-set”), which includes brakes with On-Off action and Start-Stop clutches.
Most problems in the field show up as...
By Chris Stevenson
Testing the PTO clutch should be done with caution, using proper safety steps.
The power takeoff clutch, or PTO, on a small engine uses electricity to engage a clutch to the main engine crankshaft. PTO clutches transfer rotational torque and power, typically used on small tractors to activate mower blades or tillers. The battery sends voltage to a magnetic armature and rotor, which engages the clutch and plate, allowing full contact. Problems arise when the clutch jams solid, slips excessively or the voltage becomes lost. A tractor owner can initiate a few tests to see if his PTO clutch...
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