How to change wheel bearings?

[mrphil]

Hi all,

Please could i have some advice and help, also any photos would be very handy!
I need to replace my wheel bearings on my atc 70, i have a mega wobble!

I know normal proceedure for a car would be to have them pressed out and pressed in.
To save money how easy is it to DIY?
I have bought some bearings - Koyo 6202-2rs-c3 (Inside Diameter: 15mm, Outside Diameter: 35mm, Width: 11mm)

Are these the right size? the centre looks to small for the axle?

Pretty much any advice would be apprechated! and photos would be very handy!

Thanks alot

[Vealmonkey]

I would recommend searching around on here and finding the thread on downloading free shop manuals. It will explain it much better with pictures. But if you are talking rear bearings. You have to remove the chain. Remove the 2 rear wheel and tires and the spacer collars. Then you have to release all the tension on the rear brake shoes, best to pull the adjust nut completely off the brake rod and remove the brake rod from the brake arm. Once you do this you should be able to slide the brake drum over the brake shoes and remove it from the axle completely. Then you should be able to remove the axle from the bearings, but the axle may be rusted to the inside of the bearing races. Don't tap on the axle with anything unless you put the rear axle nut on and make it flush with the axle so you don't damage the threads or don't damage them near as much. Use a piece of wood over the end of the axle and axle nut and hit that with a . The axle should slide out the left side of the frame. That will give you access to the bearings. You will have to use a long flat punch or a long socket extension bar and tap the bearing out from the inside of the bearing to the outside of the frame. You should have a bearing driver or a large socket the same diameter as the outside of the bearing races to tap the bearings back in. Do one bearing at a time and don't forget to put the bearing spacer back in before you tap the second bearing into place. Then install seals if you don't have sealed bearings and you can still put your seals in place even with sealed bearings. Then axle will go in reverse of disassembly. Don't forget to readjust your rear brake shoes and drive chain. It's a good idea when you have everything apart to inspect your rear brake shoes to make sure wether or not they need replacing and it's also a good idea to remove the brake shoe actuator and clean that up real nice and give it a nice light coating or bearing grease to help make sure it moves nice and smooth and doesn't bind. Don't get bearing grease on the brake shoe surfaces. Clean up and paint any rusty parts while it's apart and it should give you alot more years of trouble free service. Also think about lubing up your brake cable since you are messing with your brakes. Always a good time to do some necessary preventive maintenance. Have fun and take your time. But definitely download yourself a manual, it will prevent alot of headaches and tell you all the proper torque values for your nuts and bolts and give alot of nice pictures of how things should look. Best of luck and let us know how it turns out with your bearing replacement. Don't forget the front wheel bearings as well. Who knows how old they are or when they were last replaced if ever.