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Last Updated: May 14, 2015 | By William Machin William Machin William Machin began work in construction at the age of 15, while still in high school. In 35 years, he's gained expertise in all phases of residential construction, retrofit and remodeling. His hobbies include horses, motorcycles, road racing and sport fishing. He studied architecture at Taft Junior College. Magnetic resistance exercise bikes. Photo Credit Ron Kloberdanz/i Stock/ Getty Images Magnetic resistance exercise bikes use a magnetic field to create resistance. The field is generated by an electrical circuit or by internal batteries and pedaling action. A control panel is used to adjust resistance by altering the intensity of the magnetic field. Most upright exercise bikes have a magnetic unit that interacts with the metallic surface on the flywheel to provide the positive and negative poles. Chain drive recumbent exercise bikes have sensors on the flywheel and pedal cranks that generate magnetic poles. It’s advisable to review the warranty conditions before attempting repairs to magnetic resistance exercise bikes. Unplug the power cord from the electrical outlet. If the unit is battery powered, begin by replacing the batteries in the display panel and re-test the bike. Use an Allen wrench or Phillips screwdriver to remove the bolts that secure the split flywheel covers. Pull each cover to the side to expose the flywheel. Grip the flywheel and rotate the pedal cranks counterclockwise to unseat them from the internal pulley. Remove the cranks and set them aside. Remove the flywheel covers. Use a socket and ratchet to remove the nut on the pulley. Twist the pulley to the side and slip the V-belt off the pulley and the magnetic unit. Inspect the belt for damage and replace if necessary. Remove the nut that secures the magnetic unit. Remove and replace the magnetic unit. Reinstall the V-belt on to the.
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