Hi:
I'm pretty sure I have worn pinion bearings. I put a dial gauge on the
pinion yoke and pushed the shaft up and down and measured 10 thou of
movement. I can also "see" movement when I push/pull the pinion yoke in
and out of the diff housing. Considering the shaft is carried by taper
bearings and there is a pre-load on them, I expect NO movement at all.
I'm taking the drive shaft in to have the balance checked, then I'll
pull the diff cover off and look to see if there's any metal bits in it.
If it looks clean I'll just replace all the bearings and re-shim it myself.
As for the pulling bikes thing, the truck does have an electric brake
kit on it so the trailer must have been fairly big. Enclosed trailer
with bikes, spare parts, tools and weekend camping gear is probably
pretty heavy. This info came from the previous owner.
Thanks for the suggestions.
Dale
Neil W. Bellenger wrote:
>
>
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Dale Schultz
> Sent: Tuesday, October 28, 2003 9:33 PM
> To: dakota-truck-moderator@bent.twistedbits.net
> Subject: DML: Follow-up to: Vibration in Chassis
>
>
> <So did an out of balance shaft do damage to the diff or was it the early
> years of pulling a trailer full of dirt bikes around the country for
> 250000km do it?>
>
> An out of balance drive shaft will cause premature wear on the pinion
> bearing in the nose of the differential.
> The bearing should get noisy enough to be noticeable before the wear causes
> a shift in the ring and pinion contact pattern.
> The major causes of accelerated gear wear are: bad set-up on the contact
> pattern, lubrication failure (as in not enough oil or dirt in the oil), or
> torque loads way in excess of the ability of the oil to provide adequate
> lubrication.
> It's hard to imagine towing motorcycles would cause that much wear unless
> you were pulling 5,000 pounds of them on a regular basis.
>
>
>
>
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