Shimano Freehub Bearing Repair FH M678 DEORE SLX XT SAINT ZEE

FH-M678 repair.

0:00 The basics
00:39 Main tools needed
2:16 Freehub tool install
3:49 Undoing top of freehub
5:29 Removing freehub body from wheel hub
6:13 What the FH-M678 looks like
6:43 Freehub top disassembly
9:00 Opening the main body of the freehub
10:48 Pawl system strip
12:24 Pawl discussion
13:20 Pawl system rebuild
15:17 To grease or not to grease?
16:35 Army of ball bearings
21:13 Installing pawl system back into the Fhub body
23:35 Rebuilding the top of the freehub (Washers)
25:10 Nothing really, just some sped up footage
26:53 How the top bearings should look
27:07 Top back on
28:34 Reinstalling the freehub to the wheel hub
29:58 Tightening the freehub bearing race on the wheel


Bearings are 3/32 which is 2.38mm.
Grade 10 is recommended.
Chrome steel or stainless steel.
15mm allen key needed to remove the freehub from the wheel.


This ebay link is not affiliated with me and it's not my account.
Freehub tool - https://www.ebay.co.uk/itm/3040806163...

The music is free from slip.stream, they allow you to use it in YT videos without copyright strikes under certain circumstances.