Repair parts for vintage traveling sprinkler

I have a traveling cast-iron sprinkler that looks like it was made in the 1950s or 60s (maybe earlier).
It works well, but the main gear that is driven by the spinning sprinkler arms is nylon and it is wearing thin.
Back in the 70s in Sacramento, I remember the small hardware stores used to carry repair parts -- gears, seals, nozzles, etc.
I'm in Atlanta now, and I still really like this thing. It is fascinating to have a tool like this that has been working for hundreds of hours every year for probably half a century.
Anyway, where can I get parts for this thing? It says Crestline Sprinkler on the wheels, but from the pics I have seen on eBay and other sources, it looks like the same model was made by Thompson and by L R Nelson many years ago.
I'll buy the whole old sprinkler if I have to just to get that gear. Or,.. maybe I'll have one of my machinist friends make the gear -- it is pretty simple. Maybe an existing gear can be modified, eh?
Thanks for any info.
Mel
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Mel wrote:

If it really is the same as the Nelson unit then you can buy repair parts for it here: http://stores.yahoo.com/lrnelsoncorp/repa.html
--
John McGaw
[Knoxville, TN, USA]
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I have one of those old sprinklers too. It says Thompson on it, and it is not all enclosed like the Nelson.
The repair parts you refer to are for much newer sprinklers. The relics that Mel and I have are many decades old, I'll bet. Mine looks like eBay #7763298758. http://cgi.ebay.com/Vintage-Thompson-Traveling-Tractor-Sprinkler_W0QQitemZ7763298758QQcategoryZ20542QQrdZ1QQcmdZViewItem
I need the gear that he talks about and whatever assortment of seals are necessary to keep the thing from leaking so badly.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.