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Old 04-17-2006, 10:58 PM
Jason Pallas Jason Pallas is offline
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Help needed with Scag deck belt - slips off.

I'm working on a Scag 61" Tiger Cub w/Advantage Deck. The deck belt keeps coming off each time the PTO is engaged. I tried engaging the PTO at all different RPMs and I've checked all spindles and pulleys for any wobble, sticking, etc. Belt is also fine. Everything is fine - belt rotates fine when I put it on and rotate it by hand - but the second the PTO engages - the whole thing comes off. I believe I have it on right - checked it against the diagram that's written on the deck and the tension on the belt is good too. This one has me stumped. Please help me.
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Old 04-17-2006, 11:12 PM
lucforce lucforce is offline
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Is there any physical damage to the belt?

Are belt guides in place?
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Old 04-18-2006, 12:00 AM
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Restrorob Restrorob is offline
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Once a belt rolls off one time under tension it tweaks the inner cords that will give it a slight twist then it will hardly ever stay on. I would suggest a new belt and check pulley alignment and belt guides as mentioned, Engage around 1/2 throttle then once to speed give it full throttle.
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Old 04-18-2006, 12:01 AM
Jason Pallas Jason Pallas is offline
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Belt appears to be in good shape - some slight signs of wear. There are no belt guides that I can see.

Restro - the guy said that it ran fine back in Jan - after he changed the spindle, he ran it for about 20 minutes. It ran fine. However, when he re-engaged it, it ran for about 3 minutes and then slipped off. Now it slips off immediately upon engagment at any RPM. All pulleys look alingned well.

Last edited by Jason Pallas; 04-18-2006 at 12:07 AM.
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  #5  
Old 04-21-2006, 10:57 PM
Jason Pallas Jason Pallas is offline
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Thanks - it was the belt. I would have never thought it - it looked pretty good. Learn something new everyday - especially from Restrorob - Thanks again!!!
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Old 04-21-2006, 11:08 PM
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Restrorob Restrorob is offline
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No problem Jason, Glad ya got it straightened out.
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Old 04-21-2006, 11:14 PM
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TURF DOCTOR TURF DOCTOR is offline
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He is right we had the same problem with a mid mount grasshopper ever thing seem to be normal the belt got twisted some how,we changed the belt and no problem it hurt though to throw a high dollar belt in the trash.
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Old 06-22-2013, 04:52 PM
JamesVaughn3rd JamesVaughn3rd is offline
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So I know this is an ancient thread but instead of starting a new one, my issue is similar.

I was mowing the other day and went up a hill and I believe my deck drive pulley hit the ground and it popped off. Belt came off as well.

I bought a new belt since the old one got chewed up and put it on. Got everything lined up and went off. After mowing about 100 feet, I noticed that the drive pulley was slipping out and the belt was about to slip off. I placed it back into alignment and after another 100 feet the pulley slid out again and belt popped off.

So my question is, how does the drive deck pulley work? I know it has this split tapered hub that I thought tightened itself when you tightened the three bolts. Honestly I cannot get them any tighter so I am thinking that I'm missing something in making the hub stay put. Any help would be great. Thanks.
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