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Post by gsragtop on Sept 28, 2013 13:33:43 GMT -5
So I thought I had everything I needed, I thought I was ready to go.. Apparently not   I am replacing the bearings in my gearbox as per my other thread and apparently the scooter uses a special 6303 bearing in the main shaft.. It is not the same size as a regular 6303 I got from my parts store (the parts store one was larger).. The od of the outer race on my bearing measures 1.6 something, his was 1.8 something.. He checked his book to see if his was miss boxed and the book says a 6303 should be 1.8 and change.. Where can I get the proper 6303?? Second question, I'm assuming the two bearings on the final shaft are pressed onto the shaft, is this correct?? If so how do they also get pressed into the case of the gear box?? Lastly I seem to be missing the drain plug for the gearbox where can i get a new one? Thanks |
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Post by sailracer on Sept 28, 2013 14:00:26 GMT -5
That sounds extremely strange to me as numerical bearing identification is an industrywide standard. In other words , a 6303 is a 6303. No such thing as different or special.It would have a different number. The numbers indicate the diameters and thicknesses.Is it possible that the bearing in there was wrong in the first place? Try Motioncontrol.com or grainger.com
Maybe you need a 6003?
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Post by sailracer on Sept 28, 2013 14:08:35 GMT -5
Where is this guy quoting measurements from??? no 1.6 something or 1.7 something
The 6003 has a 17mm id and a 35mm Od
The 6003 also is a 17mm id with a 47mm od
Google them You will see many choices of suppliers. If you have doubts. measure the hole in the case and the shaft. Seems to me , the guy selling you bearings do'nt know what he's doing
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Post by Kwagga on Sept 28, 2013 17:27:33 GMT -5
I agree with the above that a 6303 is just that, and should not vary in size. The best is to check with the agent/supplier what the replacement is, or look at what is on the scooter. Is there no number on the bearing that you have from the scooter?
I have a manual for my scooter, but find that some of the pictures are different, such as the brake pads.
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Post by gsragtop on Sept 28, 2013 17:35:29 GMT -5
That's what I thought but he miked it right in front of me, both mine and his and then showed me the book and his was right.. There is something up with mine, and he could not seem to cross reference the sizes that mine actually was.. These are pics of what's left of the bearing one mine.   Also, if the bearing gets pressed onto the shaft how does it also get pressed into the case ?? |
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Post by sailracer on Sept 28, 2013 18:05:46 GMT -5
I checked 6303-z for you, same dimensions 17x47x14mm . the 2rs just means double sealed. You press the end bearings into the case, and the shaft end fits easier.What is the problem with the bearing? does'nt fit the casee or the shaft? Here's a strange one: NTN makes a 6303z with a 5/8' bore.that is not standard!  Mic the shaft and post results |
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Post by gsragtop on Sept 28, 2013 18:36:53 GMT -5
Found my mic, this is the outside of the outer race.. This is what was smaller on mine then it should have been.   |
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Post by sailracer on Sept 28, 2013 19:27:46 GMT -5
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Post by woowilly on Sept 28, 2013 20:51:26 GMT -5
The OD matches a 6004 bearing. Check the other dimensions. Maybe it's a mis-marked bearing.
Bearing ID OD Width ID OD Width
Number (MM) (MM) (MM) (inch) (inch) (inch)
6003 17 35 10 0.669 1.378 0.394
6004 20 42 12 0.787 1.654 0.472
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Post by prodigit on Sept 29, 2013 8:30:32 GMT -5
Small question,
the bearings of my Roketa rear wheel broke.
It seems to be a sealed bearing. Where can I buy them best, and how do I know which one to get?
I guess I can just take the broken bearing to the shop, but which shop is best to buy them from?
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Post by sailracer on Sept 29, 2013 8:37:54 GMT -5
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Post by sailracer on Sept 29, 2013 11:17:26 GMT -5
The bearing in the gearbox was too small? Mic. the gearbox bearing housing, and post a pic. I'm thinking your supplier had the right one. In your pic, the bearing looks too small for the case.
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Post by triker on Sept 29, 2013 14:11:43 GMT -5
The Bearing you should have is a 6303-2/p6, it measures 17mm I.D x 42mm O.D. x 12mm thick. This is a non sealed open bearing.
The replacement bearing you got is is probably a 6303- 2RS, It measures 17mm I.D x 47mm O.D. x 14mm thick. This is a rubber or plastic sealed bearing on both sides or double sealed. A 6303zz bearing measures the same as the 6303-2RS but uses steel shields instead of rubber or plastic.
As you can see both bearings are 6303 but are different sizes. The 6303-2/P6 bearing is probably a chinese made bearing and are not standard size bearings.
Roy
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Post by sailracer on Sept 29, 2013 14:21:05 GMT -5
That explains some of it. Take a look at his first picture. I don't know if it's the camera or what, But if you look at the upper left of the housing, that bearing looks undersized. He also stated that it was too small in his, So maybe the 6303 will fit. I gave him enough links that he should have no problem getting one.
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