Today's Message Index:
----------------------
0. 07:36 AM - Make Sure You're Listed! List of Contributors Published in December! (Matt Dralle)
1. 10:24 AM - Unservicable bearing cups (David Saylor)
2. 03:17 PM - Re: Unservicable bearing cups (Tim Olson)
3. 04:41 PM - Re: Unservicable bearing cups (David Saylor)
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| Subject: | Make Sure You're Listed! List of Contributors Published in |
December!
Dear Listers,
The List of Contributors (LOC) is just around the corner! In December I post a
list of everyone that so generously made a Contribution to support the Lists.
Its my way of publicly thanking everyone that took a minute to show their appreciation
for the Lists.
Won't you take minute and assure that your name is on the upcoming LOC? Tell others
that you appreciate the Lists. Making a Contribution to support the Lists
is fast and easy using your Visa, MasterCard, or Paypal account:
http://www.matronics.com/contribution
Or, drop a personal check in the mail to:
Matt Dralle / Matronics
581 Jeannie Way
Livermore CA 94550
USA
I would like to thank everyone that has so generously made a Contribution thus
far during this year's List Fund Raiser! Remember that its YOUR support that
keeps these Lists running and improving! Don't forget to include a little comment
about how the Lists have
helped you!
Thank you!
Matt Dralle
Matronics Email List Administrator
Message 1
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| Subject: | Unservicable bearing cups |
Here's a picture of some of the cups I just changed. I change them when
they have even just one of the marks on the inner surface. So obviously
these are toast.
My plane sat in 2016 from April to October. I suspect that may have
something to do with these marks. I'll be paying closer attention next
year. All the bearings in both MLGs and one side of NLG were replaced.
The rollers had corresponding marks.
PNs for future reference:
MLG
Timken LM29749 Cone (the part with the rollers)
Timken LM29710 Cup (the part pressed into the wheel)
Add "20629" or "2-629" the end of the PN for FAA approved parts
NLG
Timken LM67000LA Cone
Timken LM67010 Cup
(as listed on the MATCO drawing)
--Dave
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| Subject: | Re: Unservicable bearing cups |
Thanks for posting the pics and part number recap for the people who want to
save this for future reference!
Those marks almost have to not be from USAGE wear, but from sitting wear.
Notice how they are only on 1/2 of the race...that seems to indicate,
in my non-expert opinion, that either that is the side that all the weight
was on, or that was the side that had not much weight and therefore
had enough of a gap that moisture got in.
I would think that these went bad strictly from sitting too long with
moisture around. Was this still somewhat near the ocean?
I bet if you had flown regularly you wouldn't have seen this.
The unevenness of the marks also make me wonder if maybe the
bearings were just slightly loose. That's just thinking out loud...not
that I'd advise you to do anything different.
Anyway, very interesting. If you scotchbrite those marks, do they polish
off? I wonder how deep they go.
Tim
On 11/11/2017 12:21 PM, David Saylor wrote:
> Here's a picture of some of the cups I just changed. I change them
> when they have even just one of the marks on the inner surface. So
> obviously these are toast.
>
> My plane sat in 2016 from April to October. I suspect that may have
> something to do with these marks. I'll be paying closer attention
> next year. All the bearings in both MLGs and one side of NLG were
> replaced.
>
> The rollers had corresponding marks.
>
> PNs for future reference:
>
> MLG
> Timken LM29749 Cone (the part with the rollers)
> Timken LM29710 Cup (the part pressed into the wheel)
> Add "20629" or "2-629" the end of the PN for FAA approved parts
>
> NLG
> Timken LM67000LA Cone
> Timken LM67010 Cup
> (as listed on the MATCO drawing)
>
>
> --Dave
Message 3
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| Subject: | Re: Unservicable bearing cups |
Ya l think ya got it narrowed down there ;-).
It was parked for engine work for spring/summer 2016. It sat in a hangar in
San Jose, so probably less salt air than Watsonville but still maybe some.
I=99ve heard the rule of thumb is within 30 miles of salt water. But
then
it=99s lived at WVI since 2007 without any real corrosion anywhere to
speak
of.
The marks aren=99t gonna polish out. They=99re significant.
=94Dave
On Sat, Nov 11, 2017 at 3:21 PM Tim Olson <Tim@myrv10.com> wrote:
>
> Thanks for posting the pics and part number recap for the people who want
> to
> save this for future reference!
>
> Those marks almost have to not be from USAGE wear, but from sitting wear.
> Notice how they are only on 1/2 of the race...that seems to indicate,
> in my non-expert opinion, that either that is the side that all the weigh
t
> was on, or that was the side that had not much weight and therefore
> had enough of a gap that moisture got in.
>
> I would think that these went bad strictly from sitting too long with
> moisture around. Was this still somewhat near the ocean?
> I bet if you had flown regularly you wouldn't have seen this.
>
> The unevenness of the marks also make me wonder if maybe the
> bearings were just slightly loose. That's just thinking out loud...not
> that I'd advise you to do anything different.
>
> Anyway, very interesting. If you scotchbrite those marks, do they polish
> off? I wonder how deep they go.
> Tim
>
> On 11/11/2017 12:21 PM, David Saylor wrote:
> > Here's a picture of some of the cups I just changed. I change them
> > when they have even just one of the marks on the inner surface. So
> > obviously these are toast.
> >
> > My plane sat in 2016 from April to October. I suspect that may have
> > something to do with these marks. I'll be paying closer attention
> > next year. All the bearings in both MLGs and one side of NLG were
> > replaced.
> >
> > The rollers had corresponding marks.
> >
> > PNs for future reference:
> >
> > MLG
> > Timken LM29749 Cone (the part with the rollers)
> > Timken LM29710 Cup (the part pressed into the wheel)
> > Add "20629" or "2-629" the end of the PN for FAA approved parts
> >
> > NLG
> > Timken LM67000LA Cone
> > Timken LM67010 Cup
> > (as listed on the MATCO drawing)
> >
> >
> > --Dave
>
>
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