Front wheel hub regrease

mydmax
Posts: 1740
Joined: Sat Oct 12, 2013 8:36 pm

Re: Front wheel hub regrease

Post by mydmax »

Initially tighten the ring until it is tighter than when running. That seats the bearings against the axle face and also the adjusting ring. Then loosen the ring until a rattle like noise is heard when the tyre is hit inward at the top. Doesn't take much hit force to do it. That detects slack which you may not feel. Tighten until the rattle doesn't happen but not past the point where the wheel begins to become harder to turn. The factory method makes the bearings much tighter than that. With factory method if the seal vary in their grab at the axle then the tension balance method results in a tighter bearing setting if seal is slack and a looser setting if seal is gripping a bit. Small effect though. But bearing setting is small amounts indeed. If fitting a new seal then the drag of that is included in the Factory method, not an issue with this alternate way. Yes, you could use a dial gauge but vibes might alter the reading you can detect. There are a lot of vehicles around with slack bearings which get hammered over corrugations and destroyed and tight ones which destroy themselves through heat generated at the bearing faces. It is just what I do. Never had to replace any bearing on any vehicle I have owned or serviced.
goody59
Posts: 123
Joined: Fri Apr 25, 2014 2:12 pm
Location: Wollert ((Melbourne outer northern suburb)

Re: Front wheel hub regrease

Post by goody59 »

What is the desired spring scale weight in metric you should be aiming for for this (used and regreased) bearig pretension? I have a 20kg spring scale coming for this method.
mydmax
Posts: 1740
Joined: Sat Oct 12, 2013 8:36 pm

Re: Front wheel hub regrease

Post by mydmax »

If you really want to use a spring scale, the one you need is small and should be verified as being accurate prior to the job, otherwise you have no idea what preload being applied to the wheel bearing roller/cup/cone faces of the hub bearings. I would suggest a 5Kg scale so the likely reading is approx mid scale of the spring scale device. 2Kg max in a 20KG rated spring scale is like trying to read 10kmh on a speedo known to be true at 100kmh but often way off down low and at higher speed.

The Dmax manual states
NEW NEW brg and seal, 22-27N or 2.2-2.8Kg or 4.9-6.2ft Lb at right angles using a stud as the pull point. You work out the pull and measurements to provide FtLb
or
Used Brg NEW seal, 14-20N or 1.4-2.0Kg or 3.1-4.0 FtLb Again at right angles pull. The reading has to be done WHILE the hub is rotating, and NOT a reading of the standing start and beginning of movement. Because the measurement is taken "at right angles to the axle at all times" the scale has to be moved in a peripheral arc to the axle centre while the reading is being taken. Hard to rotate and read however.

A 20 KG scale is way way overkill for the job and will not provide sufficient low measurement force detection and accuracy (if using this method) will be right out the window. Expect failed bearings soon if a 20KG scale is to be used.
goody59
Posts: 123
Joined: Fri Apr 25, 2014 2:12 pm
Location: Wollert ((Melbourne outer northern suburb)

Re: Front wheel hub regrease

Post by goody59 »

Got it, I wil ll keep that one for the fish and try and find a 5kg one.
nando68@bigpond.com
Posts: 2
Joined: Fri Jan 08, 2021 7:18 am

Re: Front wheel hub regrease

Post by nando68@bigpond.com »

Hey Fellas watch this on replace the grease on the front bearings
https://youtu.be/cuXoAIpA6Ds
Danno
Posts: 3265
Joined: Sun Oct 20, 2013 1:23 am
Location: Darwin... sort of.

Re: Front wheel hub regrease

Post by Danno »

That is NOT how you tension the wheel bearings, even if you put the same bearings back in you should always re tension like they are new. Wheel bearings wear out over their life and more often than not they will be slightly loose when you take them out, imagine how they'll be in another 40k?
Cheers
Dan
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mydmax
Posts: 1740
Joined: Sat Oct 12, 2013 8:36 pm

Re: Front wheel hub regrease

Post by mydmax »

It seems anyone who can recognize a wheel bearing can do the job. He didn't evenly undo the drive plate on the hub, just rattled off in a rotary pattern. Hope he never works on anything which requires even removal or reassembly. The grease seemed quite new and unused. I wonder why Nic has the bearings the wrong way around to repack them? Why attempt it from the curved small gap side of the cage???? He didn't inspect the bearing cones or cups for any damage and didn't ensure sufficient grease in the hub well to be above the cup lips so grease when hot and molten, can flow through the bearing rolling faces for vital lubrication and life. No adjustment of bearings was done and no checking for any slack either, just same position which will be loose now if correct when new. Missed a vital step. Agree with Danno, re 40K, perhaps Nic's Dmax is called "Lucy". Loose wheel bearings hammer the cone and cup faces and rollers and destroys the bearings. Nic may not know this!
Now he reassembles using silastic on the drive member parting faces. It acts like grease and allows looseness to develop and then the studs break. Good show in a hill climb or rock climb. Yes, another Utube. masterpiece!
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