PTO vibration

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PTO vibration

Postby rcupka » Sat May 11, 2019 11:29 pm

Just started using my new to me 154 with 3160 deck for mowing. It had previously been unused for approximately 20 years. Did not seem to have a vibration when I first used it but now one the second time mowing 6 acres I am getting a wicked shake in the tunnel area and PTO handle and it shook loose some fasteners and cracked off the PTO shield brackets.

I have not yet removed the covers to see if the problem is obvious, what are the usual suspects for root causes historically?

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1949 Cub
1972 Lo-Boy 154
1964 Cub Cadet Model 70
2005 New Holland GT20

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ricky racer
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Re: PTO vibration

Postby ricky racer » Sun May 12, 2019 7:49 am

My first thought is to check the mower for a bent or broken blade. Check for anything that might throw the mower out of balance.
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Re: PTO vibration

Postby SONNY » Sun May 12, 2019 11:34 am

pto clutch disk lost a chunk inside? pto drive belts good ? mower belt look good? Like Ricky said check blades for damage OR something stuck on one of them. --- I have had stuff wrap around the end of blades and about shake the mower apart.
Check each blade bearing for smooth turning too. could be a spindle bearing going/went out.

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Re: PTO vibration

Postby BigBill » Sun May 12, 2019 6:56 pm

Bad bearings on the pto shaft the front bearing is infront of the tunnel. There’s the bearings in the pto engagement lever but that’s towards the rear almost under the seat.
If the engagement bearings are shot she would be hard to engage the pto lever and kick out of engagement. I say it’s the front pto shaft bearing, but the front double vee belt pulley could be worn on its shaft too. Galled and worn worse,

One 154 I purchased my #2 machine the po rebuilt the engine looking for a rod knock. It was the twin vee belt pulley that galled on the shaft. Rattle, rattle, rattle.
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Re: PTO vibration

Postby John *.?-!.* cub owner » Sun May 12, 2019 7:49 pm

Also check for a rock or piece of a stick wedged in one of the pulleys. That will shake everything when it goes under the belt on each round..
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