If you are keeping the blades oiled correctly and turning the screw per the instructions does not help you will need to send your clipper in for and internal adjustment. You can call Andis customer service at 1-800-558-9441 to find the service station nearest you or you can send the unit directly back to the factory.
1800 Renaissance Blvd
Sturtevant, WI 53177
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To adjust clipper/trimmers to run to their voltage needs. If clipper/trimmer rattles or over vibrates it may need adjustment to the line voltage in your area. Before adjusting, make sure the clipper/trimmer is clean and blade is oiled. Then turn the SMALL power screw clockwise on the side of the clipper until the noise disappears.
I just had this same problem. My andis Masters where working and they started making a loud sound and the blades stopped working. The Problem was there wasn't enough power. I used a screw driver and turn the power adjusting screw to the Right with a flat head screw driver.the sound got louder but after I keep turn it the blades started moving again and the blades got quiet again. Tada a Quick Fix.
Yes there will be an adjustment screw to align the blades but all clippers will make some noise especially when they are close to your ears. Go back to the shop for advice and to hear other clippers they have but you will probably find that you have one of the quietest model of a normally loud product.
First off all when buying a step down transformer for these clippers or any other electrical equitment make sure u read the label check cycle 50/60 ,and watt transformer need to be the same are close enough,with is hard to get on tha market,get it made custom,I'm a barber and we have a little trick open your andis clipper ,get spong cut it neatly just a bit thicker than the space between movin part and amateur (coil) insert spong between,not centre bit top bit to blade that's where knocking comin from it can cause that movin bit to break,trim spong until u get it quit but able to cut ,note blade will get hot because of wrong transformer and can damage coil
1 or 2 basic things happened. 1st there is an armature adjustment on the right hand side when viewing the clipper from the top (it looks like a screw). Place a screw driver in this and turn it counter clockwise, if this screw is up against the stop than you can place a small screwdriver behind it and pop it out (this is actually a cap) now you can access the actual adjuster. back this out about an 1/8 of a turn at a time until the noise stops, turn them side to side to insure that the armature is far enough off of the motor coil. Then replace the cap.
Turn the clipper on and with a screwdriver turn the screw on the side counter clockwise until it is extremely loud. Next slowly turn the screw the opposite direction until the noise quiets down to a low buzz. If this does not work for you there may be an internal adjustment that is necessary. If you need any further assistance please call the Andis customer service department at 1-800-558-9441.
Turn the clipper on and with a screwdriver turn the screw on the side all the way clockwise. Next slowly turn the screw back the opposite direction until the clippers are running at a normal sound level. If this does not work you will need to send the unit in for an internal adjustment. Please call the Andis customer service department at 1-800-558-9441 for further instruction.