So my TM has a Lovejoy type coupler the Flange is a 7S 3/4" bore, the rubber coupler is a 7... Well my flange is cracked. I has been for a bit, but it eats through the coupler fairly quickly. My problem is that I cannot find a 7S 3/4" bore anywhere. My issue is with the bore, Lovejoy says they make them, but I can't find them anywhere. However, I can easily find a 6S and a 4S with the 3/4" bore. What are the effects of going with a 6S? Is this an okay thing to do? What are the benefits or problems with sizing down? I don't want to spend a ton of money especially since I have to buy both flanges and a coupler if I go to another size, it is nice that the 6S couplers are a bit cheaper too. Thanks in advanced. Brian
Grainger should carry this coupler. You don't want to go with any other size than what the specs call for. If you think your coupler is breaking quick now sizing down will make it break even quicker. The outer part is what takes all the strain. if you size down the outer part it will wear so fast because there will be more play. I recommend replacing the cracked end or having it welded. Or just get a whole new set of flanges. Ones that have readily available couplers. Your problem may be that crack is getting larger when your rpm's rise. This in turn will cause too much play and wear easily from friction. Try not to but the flanges tight to the coupler. always pull it back slightly so the there is room for the coupler to move a little. The coupler needs to have room for end play. Its a common mistake people make when changing these things. It should never be to tight together. Maybe that will help you. I always keep a spare on the truck.
Fail. Grainger doesn't carry 3/4 in 7S Think about it...3/4" shaft... 7S...way overkill. Let me guess, 3.6 blower 18HP engine... 6J is fine, as long as you don't try to get 1500 psi for tile cleaning, but I gave you a direct 7S replacement.
7S may be overkill but thats not the issue. I'm telling you if you downsize the outside diameter your asking for problems. And if you read what your link says... It says you can have different hub/flange sizes as long as the outside diameter is the same. They say this because like I stated above, the OD is the most important part that takes all the strain. Take it for what its worth. I never even read your link and I said the outside is what takes the strain because I know what I'm talking about. And I know there a 3.7 but not sure about a 3.6.
For someone that thinks you can fit a size 6 coupling in a 7 body... I saw your comment before you edited it...haha
Really, because I own a GD 3.7. You know whats really funny? You think downsizing couplers is going to work when the right coupler is failing! Thats whats so funny. Keep laughing.
Wow, this thread got busy....lol My TM is a 15hp with a 33 Roots. It isn't that the coupler is wearing fast due to strain, but the flange is cracked and a tooth is missing. It held long enough for my downtime right now. Except I went to clean my own carpets and the coupler failed. I figured since I have it apart I might as well finally replace the flange.
Thanks, Grainger doesnt carry it. But they do have 6's, the reason it wore out was there is a tooth missing and the hub/flange is cracked. The crack has stayed the same size, but the missing tooth has taken it's toll in the coupler. It finally failed by jumping the broken tooth and striping the rubber. I was hoping for it to last until Dec 2011 and it did, so i'm not upset. I always keep it just a bit loose so there is no jamming or extra friciton. The other flange is fine so I was going to just swap out the bad one. Thanks for the tips.
If your having a hard time finding the coupler, I recommend swapping them both out with one that's readily available. A #3 or 4 is more than enough for what you have.
