Frequently, a motor will fail to start when powered up after an idle period. It may or may not make an audible hum, or it can trip the overcurrent device. To begin, check to see if there is power and if the guard or a fan blade has become bent so that the fan cannot turn. (Watch your fingers!) Remember that when the blades are forcing air forward, the fan is pushed back (if there is endplay), so it might be necessary to loosen the setscrew and shift the blade a slight amount. Then, with the power disconnected, try turning the blade.
It should be freewheeling, so that if you give it a spin, it will coast awhile before coming to a stop. If it shows resistance, the bearings are probably dry. This often happens with motors that are only about a year old because the bearings are still tight and particularly prone to seizure. The remedy is simple. Spray a little penetrating oil around the bearing where the shaft exits and spin the fan by hand until it is freewheeling. See if there is endplay. If so, work the shaft in and out as this will help distribute the lubricant.
Penetrating oil is good for freeing up seized bearings, but it does not last, so it is best to follow it up with some high-quality machine oil or a little automotive oil—30-weight for hot environments, 20-weight or multi-viscosity if the motor will have to start when the ambient temperature is expected to drop below 60°F. It is usually held that sealed bearings cannot be lubricated. This is not entirely true. There are specialized syringes for injecting oil. In addition, it is sometimes possible to spray penetrating oil around the seal. Some of it will seep in and free up the bearing.
Do not over-oil. Excess oil can spread around inside the motor and deteriorate sensitive parts such as brushes and insulation, and encourage dirt accumulation. Often the front bearing can be lubricated from the outside, but to access the rear bearing will require motor disassembly. However, the front bearing has to work harder, and it is often sufficient just to lubricate that one. It is amazing how often this simple repair works for a motor that was reported “burnt out.”
Put the motor back in service and add another drop of oil after the first day’s use. Older motors have grease fittings or oil cups. Recommended lubrication interval is given on the nameplate and should be observed. Another easy fix applies to motors that power woodworking and other equipment in dusty environments, where mechanical parts such as switches and the like may become clogged and fail to operate. Clean them out and you should be good to go. It may be possible to make a shield that will prevent recurrence, but beware of doing anything that will impede airflow.
How EG Appliance Repair Inc Professionals In Los Angeles Can Help You Today!
Los Angeles appliance repair supports various neighborhoods in the Los Angeles with proper and reliable service. As soon as all repair work is complete, residents return to their daily errands and routine and continue their lives without inconveniences caused by faulty appliances. The company provides repair service for various appliance brands, models and types, including Viking, Jenn Air, KitchenAid, Maytag, Whirlpool and many others. Don’t hesitate inquire about your appliance model type and brand to see yourself what can be done to improve the situation.