Chuck14025 9 #1 Posted October 21, 2017 To help understand how a friction collar works: 1. the collar rides on fixed shaft that run through 2 holes in a 'square' frame attached to the control handle, (the shaft is held firm by a bolt through the tab on the left side of the tractor frame - if the tab is broken, it must be fixed or the friction collar won't work) 2. fixed in the right side of the square frame (that holds the friction collar assembly) is a threaded bolt without a head, 3. instead of a head, the 'bolt' is square on the end to take a 5/8" wrench, 4. the nut that takes about a 1" wrench serves as a lock nut, 5. loosening the lock nut (adjustable wrench will fit) will allow one to turn the 'bolt' thereby tightening or loosening the pressure on the spring. 6. it may only take 1/16 to 1/8 of a turn of the bolt to get the adjustment right. Try it in small steps - don't overdo it. The whole assembly needs to be clean. NO lubrication. Members have suggested using PB blaster to clean the assembly. The whole assembly will come right out and go back in by just removing the bolt that holds the tab. If you're having severe shifting problems there may be a cracked vertical frame assembly. It is the part that attaches to the transmission with 4 bolts. If it is cracked, you must fix it. Daveoman has a series of photos and may make parts for you. Would someone please tell us how to find the info on the cracked frame on the web page. Share this post Link to post Share on other sites
Chuck14025 9 #2 Posted October 21, 2017 Information and photos regarding a cracked frame are on a posting July 19, 2017 titled "Friction Collar Rod Seizing" Also, my information relates to a C120 model. Share this post Link to post Share on other sites
By Chuck14025