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SSolo, on your left!
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2,577 Posts
Discussion Starter · #1 ·
Problem with my 2009 Haro Mary SS 29er started a couple weeks ago, the pedals would rotate forward with the chain and freewheel....occasionally while wheeling my bike around the garage. Didn't really think much about it, chain tension is good, clean and lubed. During yesterday's ride I started getting driveline noises while cranking on the pedals, again all bolts were tight, so I finished my ride. Took it in to LBS today and they said sounds like freehub pawls are catching and/or maybe chipped. Bearings are still butter smooth, chainline was off slightly but they adjusted that. They were getting ready to close and don't have the freehub in stock, so I would have to come back or leave it and I want to ride Monday. :)

So...who's taken apart their Mary freehub (Pivit branded), rebuilt, cleaned, lubed it, etc.? What tools do I need, torque specs etc? I'm thinkin just pull the freehub off, clean, lube and throw it back on for now. If it's still noisy and sticky then I'll get a new freehub for it. Any links to exploded diagram etc?
 

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SSolo, on your left!
Joined
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2,577 Posts
Discussion Starter · #2 ·
Took apart my freehub and found that the pawls were starting to rust at their pivot points. There are four pawls retained by a circlip type spring.

1) To take apart the Pivit SS rear hub, after removing the rear wheel from the bike, remove the QR axle.

2) Next you may remove the lock-ring, the rear cog and spacers (however this is not necessary unless your replacing the cog.)

3) Remove the bearing pre-load nuts from both sides of the axle, carefully tap the axle on the left side (opposite the freehub body) until the freehub pops out with the outer bearing still in it. You do not need to remove the axle all the way assuming your bearings are still good (mine were.)

4) Carefully clean out the hub body where the pawls engage (a little spray cleaner and a rag, but be careful not to force dirt and debris into the hub.)

5) Remove the circlip type spring that retains the four pawls in the freehub body.

6) Slide the four pawls out of the freehub body and clean using some solvent, a rag and an old toothbrush.

7) Once it's all clean just reverse the steps to reassemble, lightly oil each pawl pivot point with some teflon oil such as Tri-Flow, but don't overdo it (before installing it back into the rear hub.) This freehub is not sealed in any manner, it relies on close fitting parts to keep the water and dirt out...similar to a Shimano geared freehub. So be careful with the water while washing your bike.

Tighten the bearing preload nuts just enough to take up the side play and reinstall the wheel assembly back into the frame droupouts and secure with the QR. :)
 
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