ANTPER 207 #1 Posted June 22 (edited) Hi I'm getting drive belt slap with clutch pedal pressed down. It slaps the belt guard shield that is bolted to the bottom of right foot rest. Belt looks in great condition. It drives around great no slip detected. I'm gonna give up my struggle on diagnosis and just replace the belt as I don't know of any adjustments on a drive belt. Anyone know some clue that's staring me in the face before I change this belt? TIA. Anthony Edited June 22 by ANTPER Share this post Link to post Share on other sites
Lee1977 6,774 #2 Posted June 22 (edited) When you have it apart check the clutch shaft, there may be wear in the frame causing extra belt loosen. I added brass bushing to the frame on my C-120 as it made a knocking sound with the clutch depressed. Edited June 22 by Lee1977 2 Share this post Link to post Share on other sites
Ed Kennell 38,598 #3 Posted June 22 1 hour ago, ANTPER said: I'm getting drive belt slap with clutch pedal pressed down. When the clutch is depressed, the belt should not be moving. Does it grind when you shift gears? Here's a video of a 310-8 belt and pulley arrangement. You can see the belt is locked from moving when the clutch is depressed. 2 Share this post Link to post Share on other sites
ANTPER 207 #4 Posted June 22 (edited) 10 minutes ago, Ed Kennell said: When the clutch is depressed, the belt should not be moving. Does it grind when you shift gears? Here's a video of a 310-8 belt and pulley arrangement. You can see the belt is locked from moving when the clutch is depressed. No grinding Belt isn't moving. Its working exactly as you video. I think the crank rotation against the belt on PTO is where the motion is and causing the slap to the bottom on belt guard Edited June 22 by ANTPER Share this post Link to post Share on other sites
Ed Kennell 38,598 #5 Posted June 22 Yeah, the belt does vibrate a bit as the engine pulley touches and releases the belt. Should not be a problem for the tractor, just an irritation for the operator. A new kevlar wrapped belt may help. I've had good luck with the TSC belts. 1 Share this post Link to post Share on other sites
ANTPER 207 #6 Posted June 22 I've owned quite a few 310s and never had one slapping like this slap. I wish there was a way to raise the lower belt keeper tang that's bolted to engine up towards belt closer. That would most likely help. I've thought about installing a spacer plate between the foot rest and shield so belt can't reach shield to slap it. 2 Share this post Link to post Share on other sites
ANTPER 207 #7 Posted June 27 On 6/22/2024 at 11:59 AM, Ed Kennell said: Yeah, the belt does vibrate a bit as the engine pulley touches and releases the belt. Should not be a problem for the tractor, just an irritation for the operator. A new kevlar wrapped belt may help. I've had good luck with the TSC belts. Well I should just done this instead of struggling with this slap noise. I threw the towel in and replace the belt and boom all set. I just couldn't sell something making that noise. I like sleeping at night. Thanks for the input 1 Share this post Link to post Share on other sites
peter lena 8,716 #8 Posted June 27 @ANTPER in addition to having the correct belt , would get after related linkage response to spring pull , seen so many rusty / dry movement points , another thing is the original type of idler pulley , with the tiny bearing , replaced all of mine , with same size pulley , larger bearing , which I regreased , and bushed to a 3/8 " bolt mount point , you can always paint it red , smooth / easy quiet . regular penetrating oil , to every spring pull point , pete 1 Share this post Link to post Share on other sites
JP56 39 #9 Posted June 28 On 6/22/2024 at 10:54 AM, Ed Kennell said: When the clutch is depressed, the belt should not be moving. Does it grind when you shift gears? Here's a video of a 310-8 belt and pulley arrangement. You can see the belt is locked from moving when the clutch is depressed. Ed, can you read & give me the numbers & make of the belt on your tractor in this video please, or is it the same one shown in 2 posts above this one? That is the belt I have on mine right now & it is really bouncing & slapping around, driving me crazy. Share this post Link to post Share on other sites
Ed Kennell 38,598 #10 Posted June 28 (edited) 8 hours ago, JP56 said: Ed, can you read & give me the numbers & make of the belt on your tractor in this video please, or is it the same one shown in 2 posts above this one? That is the belt I have on mine right now & it is really bouncing & slapping around, driving me crazy. It is the TSC belt shown in the pic. I suggest you closely inspect all three pulleys in the loop. Look for something stuck deep in the VEE of the engine or transmission pulleys. I have found small stones and twigs imbedded in the pulleys that cause a belt to bounce. Another cause can be a bad bearing in the tension pulley or a worn hole in the frame that supports the idler cross shaft or a weak spring that tensions the idler . I should add that a new belt will slap until it is used and stretched enough to remove the memory of the bends caused by the folds from the long storage in the packaging sleeves. This is especially true with the heavier wrapped 5/8" drive belts. You can see some of this in the belt in my video. This is a brand new belt and after mowing with this tractor, this vibration is gone. Edited June 28 by Ed Kennell Share this post Link to post Share on other sites
JP56 39 #11 Posted June 28 3 minutes ago, Ed Kennell said: It is the TSC belt shown in the pic. I suggest you closely inspect all three pulleys in the loop. Look for something stuck deep in the VEE of the engine or transmission pulleys. I have found small stones and twigs imbedded in the pulleys that cause a belt to bounce. Another cause can be a bad bearing in the tension pulley or a worn hole in the frame that supports the idler cross shaft or a weak spring that tensions the idler . Thanks a lot for the tips Ed! Funny, when I ran it with the cover off & watching the belt jumping & wiggling around, I started thinking maybe I should check the front & rear pulley alignment also since it appeared to have a slight side ti side wobble, and I have no idea what the guy I got it from maybe did or didn't do to it, so maybe he had one or both of the pulleys off at some point & the alignment could be a bit off, because I only get the noises with the covers in place. Share this post Link to post Share on other sites
Ed Kennell 38,598 #12 Posted June 28 3 minutes ago, JP56 said: appeared to have a slight side ti side wobble This brings up some new possibilities. 1. a cracked frame or loose bolts at the frame tranny joint 2. incorrect or loose tranny pulley 3. loose engine mounting bolts 1 Share this post Link to post Share on other sites
