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General Forestry => Forestry and Logging => Topic started by: Breithaupts on November 19, 2017, 10:00:31 AM

Title: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:00:31 AM
Anyone know where I can find parts for a front differential for a Garrett 21A skidder?  Having trouble finding one.  Mine is tore up.  Thanks gents...and ladies of course!  I'm near Seattle, Washington, but would be glad to ship one in from anywhere.  My mechanic can't find one...yet.  He's a great guy, just having trouble sourcing the diff.
Title: Re: Garrett 21A Differential PAerts
Post by: bushmechanic on November 19, 2017, 10:08:38 AM
A picture of the differential or the planetary would help out. I believe the axles are Rockwell's in that machine. What is the ratio of the diff? It is stamped on the end of the pinion.
Title: Re: Garrett 21A Differential PAerts
Post by: MT logger on November 19, 2017, 10:29:42 AM
I have a straight 21 i am parting out I put an open diff in the front a couple years ago got it out of Chicago cant remember the gear house name. If mine are the same as the 21A send me a message.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:37:37 AM
I have asked my mechanic what the ratio is on the diff, but it's Sunday morning at 7:30 here so he's kinda slow on the reply...lol  I will get back to you tho!  I need the old girl back as I need to yeard wood!
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:39:28 AM
MT Logger - Do you have diff parts still on the 21 you are parting out?  I think there's a good chance they would be the same.  Real similar machines in many respects.  Curious what parts you do have?
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:47:55 AM
How the heck do I post a picture of the differential on here?  I have one.  I think the photo of the diff should be in my pictures if I'm doing it right?!?
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:53:13 AM
OK the picture of the differential is in my gallery.  Can you see it?
Title: Re: Garrett 21A Differential PAerts
Post by: 78NHTFY on November 19, 2017, 10:55:56 AM
 

 (https://forestryforum.com/gallery/albums/userpics/46089/Garrett_Differential~0.jpg?easyrotate_cache=1511106342)
Thought I'd help out with the photo upload ;) :D.  All the best, Rob.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 10:57:45 AM
Thanks, Rob!
Title: Re: Garrett 21A Differential Parts
Post by: Breithaupts on November 19, 2017, 11:00:17 AM
Photo of diff.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:07:32 AM
(https://forestryforum.com/gallery/albums/userpics/46089/Garrett_Differential.jpg?easyrotate_cache=1511103472)
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:08:52 AM
Ahhhh...I see how to post pics in the thread now! Sheesh, i'm not the sharpest marble in the bag sometimes...haha
Title: Re: Garrett 21A Differential PAerts
Post by: bushmechanic on November 19, 2017, 11:21:10 AM
Definitely a Rockwell diff, now all you need to know is the ratio. It is stamped on the pinion end where the yoke slides on in the number of teeth on the pinion gear and the number of teeth on the crown gear. Most likely 5/39 which is common in skidder diffs. If so there are a lot of machines you could source that from.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:25:38 AM
Sent your questions to my mechanic.  He's in Sequim, WA.  otherwise I would drive over and look.  I'm in tacoma, WA

This forum is AWESOME 8)
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:30:34 AM
Bushmechanic - Do you think I should try and source off an old skidder that is parting out, or is there somewhere to buy new/used?  Mechanic tells me Rockwell says they are not in stock any longer.  New one may put me under any way... Forget about a "Used Log Truck".  What about a "Used Log Skidder"?  Buzz Martin must not have owned one, ehe?
Title: Re: Garrett 21A Differential PAerts
Post by: bushmechanic on November 19, 2017, 11:34:15 AM
I'm not sure but I think there is an forum member on here from Tacoma that goes by the name of tantoy. He recently rebuilt a Garrett and an excellent job too! Search the forum its a good read.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:35:30 AM
I've seen Tantoy on here before.  Will do, thanks!
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:51:02 AM
Rockwell Differential is Ratio is 7.8: 1

(https://forestryforum.com/gallery/albums/userpics/46089/Rear_diff.jpg?easyrotate_cache=1511110064)
Title: Re: Garrett 21A Differential PAerts
Post by: bushmechanic on November 19, 2017, 11:54:29 AM
I have got gear sets from truck applications and installed them before, some bolt up perfect and others I have had too redrill the crown bolt holes too fit. Either way it won't be cheap, the last one I did was an Eaton and the gear set ran about $1200 Canadian, not including bearings or seals. Aftermarket Parts is a good source for forestry parts. It may be easier to get a diff from a parted out machine, anyway good luck with that.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 11:57:36 AM
Thanks for the info Bushmechanic.  Will pass along your reply to my mechanic and have also reached out to Tantoy so we'll see what we can come up with.  I would pay $1200 in a New York Second...
Title: Re: Garrett 21A Differential PAerts
Post by: snowstorm on November 19, 2017, 11:58:46 AM
Quote from: MT logger on November 19, 2017, 10:29:42 AM
I have a straight 21 i am parting out I put an open diff in the front a couple years ago got it out of Chicago cant remember the gear house name. If mine are the same as the 21A send me a message.
it may have been general truck in chragio
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 19, 2017, 12:03:05 PM
What parts do you have off the Garrett 21 you are parting out?  I may be interested in buying some if they are still available.

Thank you!
Title: Re: Garrett 21A Differential PAerts
Post by: pdxh20 on November 22, 2017, 01:31:11 AM
I did both of my Rockwell diff's & planetaries on my '74 IH S-8 here in Portland this year. Keep in mind the Rockwell numbers and the mfg numbers are not always the same. NorCan Parts http://www.norcan-parts.com/default.htm in Spokane got me some stuff and Northwest tractor in Boring, OR http://www.nwtractorparts.com/ is another good source. Wayne at Six States http://www.sixstates.com/products/location.jsp?location=8 in Portland rebuilt one (non-locker) for around $800 and sourced another good used core out of LA for $600 delivered. All three shops are great at crossing part numbers and finding hard-to-get items for these old machines.
Title: Re: Garrett 21A Differential PAerts
Post by: Breithaupts on November 22, 2017, 04:26:00 PM
Thanks PDXH20 for the help on diff parts!  Need to get the old girl running soon.  Land owners are screaming to get wood yarded and I hate to rent a machine.  There's a gent up here that wants $6K/week to rent out his Clark triple six...what a piece of junk!  By far the worst skidder I ever ran!  Sorry if I offend any gents out there...
Title: Re: Garrett 21A Differential PAerts
Post by: tantoy on November 23, 2017, 11:04:16 AM
Nice talking to you yesterday John, By chance did you try county line equipment in fife?