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  #1  
Old 07-28-2021, 11:27 AM
Equidawn Equidawn is offline
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Location: Virginia
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Default Mower deck lock up

New here. model 3225, 50” deck, shaft drive:
While mowing lawn, the deck suddenly locked up and caused the belts to start smoking and shortly afterwards killed the engine, while I was trying to disengage the clutch.
there was nothing in the blades or belts, by hand the mower deck spins freely, no grinding, no odd noises.
checked PTO belts and everything moves freely. Unengaged engine runs strong. Engage clutch, immediately goes into lock down, slowing engine and starts to smell like burning belt, although not seeing smoke.
wondering if the “Deck transmission” ? Can cause a problem like this. ? Box on deck that converts power from shaft drive to belt drive.
Are there Other possibilities I’m overlooking?
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  #2  
Old 07-30-2021, 11:28 AM
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Cub Cadet 123 Cub Cadet 123 is offline
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I am unfamiliar with your 3225, but from what you have described, it sounds like the PTO ("engine clutch") on the engine needs replaced. Probably around $150 or so for the part.

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Old 07-31-2021, 09:14 AM
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Sam Mac Sam Mac is offline
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Disconnect the drive shaft to the mower deck and see if you can turn it and if the blades turn freely. If that checks out then the next thing to look at is the shaft that runs through the front axel that the PTO belts are connected to. The shaft is the item circled in red.
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  #4  
Old 07-31-2021, 11:39 AM
Red Dave Red Dave is online now
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Quote:
Originally Posted by Equidawn View Post
New here. model 3225, 50” deck, shaft drive:
While mowing lawn, the deck suddenly locked up and caused the belts to start smoking and shortly afterwards killed the engine, while I was trying to disengage the clutch.
there was nothing in the blades or belts, by hand the mower deck spins freely, no grinding, no odd noises.
checked PTO belts and everything moves freely. Unengaged engine runs strong. Engage clutch, immediately goes into lock down, slowing engine and starts to smell like burning belt, although not seeing smoke.
wondering if the “Deck transmission” ? Can cause a problem like this. ? Box on deck that converts power from shaft drive to belt drive.
Are there Other possibilities I’m overlooking?
I'm not familiar with a model 3225, but I've been following this thread and the responses with interest. If I am reading your description of the problem(s) correctly, it sounds like you have 2 issues:
1/ the deck locked up suddenly, and for no immediately apparent reason
2/ you were not able to disengage the PTO clutch quickly, which caused the belts to smoke and stall the engine.

Again not familiar with that model, but to your question about the transmission on the deck, if everything else is free, I would be very suspicious of that transmission. Could something inside it be moving when power is applied that jams, causing it to jam and lock up?

I'll sit back and watch now, I'm curious what solution you find.
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Old 08-02-2021, 07:26 AM
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Oak Oak is offline
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Check what Sam said. There is a grease fitting on the axle (#20) that may have got overlooked.
https://www.cubcadet.com/en_US/conte...0d87009d4452/y

If that checks out okay then inspect the nylon flange bearings(#19) on the pto assembly. I had some that failed causing my belts to smoke. There should not be much movement in the assembly.
https://www.cubcadet.com/en_US/conte...59d42274fbbf/y

If all that checks out okay I would pull the cover off of the gearbox on the deck. I'm not sure which deck you have but if you stand it up so the cover is facing up you can suck the oil out and inspect the gears and see if there are any damaged teeth.

I have had good luck using these fine belts.
https://www.ebay.com/itm/11310623421...EAAOSwZupgEtPv

Good luck and let us know how it goes.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

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