Nagano Mini-excavator
John Normile
"Nagano" NS-15. The problem is in the unit that rotates the cab and
bucket arm. After disassembly we found the pinion that mates with a
large ring gear is broken.
My friend was told that the pinion was not available, and he would
need to buy the whole new rotator unit for something north of 5 grand.
At this point we are looking for a source for a used part. After a
web search I was not able to locate a used part of even a used rotator
unit.
Any help in finding this part would be appreciated.
John Normile
camperkn_at_yahoo_dot_com
John R. Carroll
Could you just make one?
--
John R. Carroll
Artemus
"John Normile" <jnor...@suddenlink.net> wrote in message
news:4b6ce484...@news.eternal-september.org...
they can repair it for you? If not, maybe they can make you a new one?
Art
Jim Wilkins
> ...
> My friend was told that the pinion was not available, and he would
> need to buy the whole new rotator unit for something north of 5 grand.
> John Normile
> camperkn_at_yahoo_dot_com
Making an unavailable gear::
http://picasaweb.google.com/KB1DAL/HomeMadeMachines#5285710370886636434
The cutter was shaped to fit an undamaged tooth space in the broken
original.
That one is aluminum. How about Stressproof or 4140 Prehardened?
jsw
John R. Carroll
Better to break the pinion than the ring for one thing.
Make two and have an available spare.
--
John R. Carroll
Ed Huntress
"John R. Carroll" <nu...@bidness.dev.nul> wrote in message
news:0L-dnWO62ai2c_HW...@giganews.com...
But neither Stressproof nor a machineable hardness of 4140 is going to make
much of a pinion. Those things typically are loaded like crazy. If they're
through-hardened (the weakest heat treatment for a highly loaded gear, but
the most common), they're generally too hard to machine with ordinary tools
and machines.
Is this a straight-tooth pinion, or a spiral or hypoid? If it's one of the
latter, there aren't many shops that could make it, without a Gleason or
Liebherr gear generator, which means a custom gear maker. Not cheap. Even if
it's straight, it's not a heck of a lot easier. The teeth and the gullets
are tapered from one end to the other.
I'm wondering if the size of the set is close enough to that of a truck ring
and pinion that you could make that fit, or machine either one a bit to fit.
--
Ed Huntress
John Normile
That would be a little complicated.
The pinion has two ground bearing surfaces plus a spline on one end
and the gear on the other end. Being of Japanese manufacture, I
assume both the gear and spline are metric. I am looking at reparing
the existing pinion shaft, but want to explore finding a replacement
first.
A previous owner had problems with this part, and a half asses repair
he made to the gear teeth further complicates any repair. I am in
the process of measuring the (30? inch) ring gear to calculate the
size of the pinion.
John
Jim Wilkins
> he made to the gear teeth further complicates any repair. I am in
> the process of measuring the (30? inch) ring gear to calculate the
> size of the pinion.
> John
Does this machine need to work hard to make money or can the operator
afford to baby it?
jsw
Ned Simmons
Normile) wrote:
>
>The pinion has two ground bearing surfaces plus a spline on one end
>and the gear on the other end. Being of Japanese manufacture, I
>assume both the gear and spline are metric. I am looking at reparing
>the existing pinion shaft, but want to explore finding a replacement
>first.
>
Perhaps a last resort, but I just had a couple gears that need to be
duplicated quoted by these folks.
http://www.wgear.com/
One part was a non-standard (extended pitch) 8DP pinion on the end of
a shaft, with two bearing seats and a locknut thread, made from 4150
with induction hardened teeth. The price was about $900 for two
pieces, including an engineering charge to measure and document the
original gears.
By no means cheap, but it didn't seem unreasonable to me.
--
Ned Simmons
Too_Many_Tools
Sounds like he has a problem.
http://www.machinerytrader.com/list/list.aspx?ETID=5&catid=1033&Manu=NAGANO
Better start checking the junkyards.
TMT
John Normile
<kb1...@gmail.com> wrote:
>On Feb 6, 2:00=A0am, jnorm...@suddenlink.net (John Normile) wrote:
>> ...
>> A previous owner had problems with this part, and a half asses repair
>> he made to the gear teeth further complicates any repair. =A0 I am in
>> the process of measuring the (30? inch) ring gear to calculate the
>> size of the pinion.
>> John
>
>Does this machine need to work hard to make money or can the operator
>afford to baby it?
>
>jsw
I really don't know. I suspect the owner is willing to make some
compromises as the machine is now essentially useless.
The owner suspects that the first repair failed after the operator
tried to move some material sideways; pushing it with the bucket by
rotating the cab/bucket arm assembly. This heavely loaded the
rotator pinion and caused the repair to fail.
John