Quote:
Originally Posted by Hydratech
Jody, that definitely was as close as you could get to a BAD experience. I am glad that you caught it before it caught you - ZOIKS!
That doesn't look like a bolt of strong metallurgy. I don't know how many of these you have in your arrangement, but I'm sure you are going to check them all. Obviously (?), research some upgrades in vastly stronger bolts, as that thing galled and wore like butter. I'm not sure of exactly what bolt size that is, but hop on https://www.mcmaster.com/ or similar and look up the strongest tensile strength bolt of that size and replace it and anymore like it. It looks like you may have to amputate any extra threaded length from any common bolt sizes available to match the short threaded section on your bolt, but that's not a big deal. Make sure the blank shank length is proper, as the threaded area is not meant to be a load bearing area (for those that may not know this). What I do see is a lack of lubrication. When I service my Rotary asymmetrical two post hoist, I use Redline synthetic chassis grease and also the engine builders red Permatex moly lube (think of the break in goo you put on cams and lifters). When and where possible, I also carefully drill a small hole in place so as to be able to install a Zerk fitting that will allow me to grease any points easily without disassembly, but watch out not to possibly drill any heavy load bearing area to make sure you don't create any stress risers. I like to dress machinations up whenever I can, and would suggest you check with ARP to see it they may have a fancy 12 point cool looking ultra strength fastener in that size. I even put aluminum T grip style B & M shifter handles on my manual safety release lever and also the hydraulic release lever - makes people laugh asking how many gears my hoist has LOL. |
I'm a fan of McMaster Carr for sure. In the size I needed I had to order longer and cut down to get the thread length and overall length correct. Grade 8 is what's needed according to the lift manufacturer, think that's as high as I found with the specs needed.
There are 10 total pulley/bolts and all the others look great. And no evidence of grease used on them either, so I'll be spraying with the dry lube.