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Bearing\hub inspection
#1
<img src="http://www.myhostedpics.com/images/moosemoose/2001trek4900.jpg" alt="image hosting by http://www.myhostedpics.com/" />img

Hello everyone,

I was given a 2001 Trek 4900, I'd like to make it my dedicated trainer bike but it has a few issues...

First of all I'm new to bicycle repair and my knowledge of parts identification is still at a basic level. So bear with me, in the picture of my freehub I believe it is called the number 1 points to a spline, with a total of 12 grooves and a inside diameter of .9 inches (22.86 mm) groove to groove. I would like to take off these parts to investigate bearing damage on this side of the hub. Is this a right hand thread (counterclockwise to remove)? What tool will fit this spline? What is the name of #2 and will it come off when the spline is removed?
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#2
What you have is not a freehub, but a partially disassembled freewheel. The tool to remove this is called a "shimano freewheel removal tool", you can google it or buy at pretty much any bike shop. It will fit in the splines and unscrew the ratcheting body (#2) (normal threads). That will uncover the drive side axle bearings so you can inspect, repair, etc.

It is possible to disassemble the ratcheting body by unscrewing the lockring that has the two little holes on the outside. Note that there's lots of small bearings and springs inside this. Most people do not bother to open up and service freewheels as they are easily replaced at low cost.

More info here: http://sheldonbrown.com/free-k7.html
EOF: obligatory SB link
  Reply
#3
Thanks Dave
(10-20-2011, 01:48 PM)DaveM Wrote:  What you have is not a freehub, but a partially disassembled freewheel. The tool to remove this is called a "shimano freewheel removal tool", you can google it or buy at pretty much any bike shop. It will fit in the splines and unscrew the ratcheting body (#2) (normal threads). That will uncover the drive side axle bearings so you can inspect, repair, etc.

It is possible to disassemble the ratcheting body by unscrewing the lockring that has the two little holes on the outside. Note that there's lots of small bearings and springs inside this. Most people do not bother to open up and service freewheels as they are easily replaced at low cost.

More info here: http://sheldonbrown.com/free-k7.html
EOF: obligatory SB link
  Reply


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