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Tool Talk Discussion Forum

bevel gear repair

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Bryan in iowa

09-23-2004 07:08:56




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I have some bevel gears in a track hoe that the teeth are rounded off and skipping. Any idea how to repair ? Weld them up ? Can't find source for replacements. Two are 26 tooth about 9 1/2 dia , the other is 36 tooth about 18 inch dia . Thanks




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j-tex

09-24-2004 12:18:22




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
Rush Gear in Fort Washington,PA 1.800.955.7321 24 hr turnaround if you are willing to pay for it



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NC Wayne

09-23-2004 20:42:40




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
I'm gonna be the first and ask what make machine is it, and what is the serial number? I have several books at the shop with listings for heavy equipment salvage yards all over the US. Surely one of them has a machine like yours on the lot somewhere unless it's "ancient" and then I can just about bet that there are still a few of them setting around anyway. My luck finding parts for old equipment is usually pretty good. The only thing i haven't been able to find was an axel seal for a guy...but I was able to find who had bought the company, that bought the company, that boght the company....that was no longer making them.....I don't know where your located, but there is also place outside Gastonia, NC that can make just about any kind of gear you might ever need. Repost with the make and serial number and exactly which gears your needing and I'll be happy to make a few calls for you. If you have the part numbers for the gears that can be helpful, but it's not usually necessary on larger parts. God luck, Wayne

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bobcatdon

09-23-2004 21:00:40




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 Re: bevel gear repair in reply to NC Wayne, 09-23-2004 20:42:40  
Hi Wayne I noticed you mentioned you have listing of machinery parts I was wondering if you could look and see if anyone has any parts for a massey ferguson Skid Steer MF711 Thanks Don



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NC Wayne

09-23-2004 21:00:01




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 Re: bevel gear repair in reply to NC Wayne, 09-23-2004 20:42:40  
DUH...my bad I see your in Iowa, so why did I ask... too I just saw your post on the crawlers board saying it's a Little Giant machine. I'll make a few calls tomorrow and see if any of my normal contacts have anything or if they know who might.



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Dr.EVIL

09-23-2004 14:46:51




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
Place around Engelhardt Gear in Elk Grove Village north of Chicago. They aint cheap but can make You replacement gears. Send them the old ones and they'll make the new ones! 847-766-7070



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T_Bone

09-23-2004 10:42:11




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
Hi Bryan,

The basics, weld for teeth build-up, hard face, shape teeth, heat treatment.

I wanna do some thinking before I suggest specifics and procedures. I'm put'n the winter garden in now so it'll be a couple days or so.

send me a e-mail if I forget.

T_Bone



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T_Bone

09-27-2004 01:54:04




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 Re: bevel gear repair in reply to T_Bone, 09-23-2004 10:42:11  
Hi Bryan,

Preclean to sound base metal making sure you remove all rust and scale, then I would preheat too 900� then let air cool until warm (removes stress), then reheat too 500� (reduces weld cracking), then I would use Lincolns Wearshield BU for pre build-up of the tooth, then ruff shape the teeth, then cap the last two passes with Lincoln ME hardsurface rod using single striger beads then reheat too 500� and quench in oil.

Do not use more than 3 layers Linclon ME as it would be prone to cracking and fracture. The finished product will have about a Rc59 hardness with 2 layers. You will want to use about 30amps more than normal for a given elecctrode size. Do not use a weave bead as this is a fast freeze electrode and it will easy to intrap slag between passes.

T_Bone

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MAC,IL

09-23-2004 10:34:59




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
I agree with Bob, check with boston gear. I have years ago purchased a lot of stuff from them. I dont think you will have much luck trying to build these up. They may have an instock item or possibly one that only needs rebored and keyed. As cheap in the long run.



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Bob

09-23-2004 09:31:58




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
If you need new gears, and the old ones are no longer available from the manufacturer, check with Boston Gear. They have a wide variety of stock gears, including bevel, and will custom modify them to fit your needs. Probably not cheap, but better than junking the machine.



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Mike M

09-23-2004 09:14:10




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 Re: bevel gear repair in reply to Bryan in iowa , 09-23-2004 07:08:56  
What do these drive ? Is it high speed ? Have you tried to mesh them in tighter ?



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Bryan in Iowa

09-23-2004 09:21:28




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 Re: bevel gear repair in reply to Mike M, 09-23-2004 09:14:10  
These are relatively slow turning gears,,they drive the crawler tracks by way of another set of gears and then out to chains . They were never adjusted and that is why they got so bad they started skipping .If they had been adjusted when needed,machine would prolly still be in use. One gear has teeth pretty rounded off , other two there is enought left to get some idea of the profile .



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