Gentlemen,
I'm currently rebuilding a 3hp treadmill motor. It was always kind of loud but recently was making scratchy sound and followed a high pitch whine. So I pulled the motor and broke it down to check the bearings. I estimate this motor has about 2500 hours (aprox. 1 hour a day for 7 years) There was some dust in the motor and metal filings around the magnet. I cleaned everything up with isopropyl alcohol, lightly sanded the commutator, the brushes were in good shape.
The two bearings are pressed on each end of the armature. The noisy one was on the commutator side next the the vents and dust. The one the other end with the fly wheel had a bit of rust under the shaft and was tough to get off. The bearings have no brand name or country of origin, only mark is 6203 and the size is 17x40x12. I pulled the seal an it has a steel cage. On the noisy one the grease was on the outside of the cage and black.
I'd like to replace it with a long lasting & quite bearing if possible. There are a lot of bearing suffixes and prefixes that refer to the seal & cage type. I've seen prices from $4 to $20. Advance Auto has a bearing part number 203-FF that is the right size and designed as a alternator bearing. They have a cheap line and a premium called National Bearing but I'm not sure if that's good brand or just a house brand.
What should I look for in a replacement bearing? Is 2500 hours good life in this application?
Thanks for your advice.
I'm currently rebuilding a 3hp treadmill motor. It was always kind of loud but recently was making scratchy sound and followed a high pitch whine. So I pulled the motor and broke it down to check the bearings. I estimate this motor has about 2500 hours (aprox. 1 hour a day for 7 years) There was some dust in the motor and metal filings around the magnet. I cleaned everything up with isopropyl alcohol, lightly sanded the commutator, the brushes were in good shape.
The two bearings are pressed on each end of the armature. The noisy one was on the commutator side next the the vents and dust. The one the other end with the fly wheel had a bit of rust under the shaft and was tough to get off. The bearings have no brand name or country of origin, only mark is 6203 and the size is 17x40x12. I pulled the seal an it has a steel cage. On the noisy one the grease was on the outside of the cage and black.
I'd like to replace it with a long lasting & quite bearing if possible. There are a lot of bearing suffixes and prefixes that refer to the seal & cage type. I've seen prices from $4 to $20. Advance Auto has a bearing part number 203-FF that is the right size and designed as a alternator bearing. They have a cheap line and a premium called National Bearing but I'm not sure if that's good brand or just a house brand.
What should I look for in a replacement bearing? Is 2500 hours good life in this application?
Thanks for your advice.
