PTO vibration

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rcupka
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Tractors Owned: 1949 Cub
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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?

Thank You
Dick Cupka
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.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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John *.?-!.* cub owner
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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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rcupka
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Tractors Owned: 1949 Cub
1972 Lo-Boy 154
1964 Cub Cadet Model 70
2005 New Holland GT20

Re: PTO vibration follow up - Did not expect this

Postby rcupka » Mon Aug 05, 2019 8:54 pm

The vibration got so bad that one time when I was using it the PTO just quit and it was done. Parked the tractor in the barn and have just today got to taking it apart. Removing the pulley and cover and noticed that the rear cam lever was out of the clete, the cleat was bent over and the arm on the cam was cracked and worn badly.

Thinking that was the reason why it was not working I continued to disassemble it and found all of the drive lugs on the friction plates to be completely worn off! they were almost smooth to the circumference of the plate itself. The drive cup itself looks good with no visible wear and the spacers, wave washers, etc... all look like new.

The cam had all three balls in it and it worked correctly and when locked up the balls snapped into their locked position. All bearings felt fine, nothing is rusty or corroded? I continued to look for a root cause that would have cause the initial problem, but I am left to guess the root cause? I purchased the tractor from the original owner, an elderly woman that always had the service done at the dealership but it is possible that it was misassembled.

While I had the clutch on the bench I clamped the PTO mount into the vise and rotated the shaft and noticed a small amount of run-out on the shaft. I assume a minor amount would be taken up by the design tolerances of the drive cup and the friction plate lugs which would allow minor movement. Does anyone know if there is a spec on shaft run-out for this assembly?

I also noticed when I was looking up parts at Hamilton Bob's that they sell a PTO Lever spring. There is/was no spring on my PTO lever, rod or arm, Is there supposed to be?

Thanks for any experience you can lend, If you think Pictures would be helpful I will post some tomorrow

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

rcupka
Cub Star
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Posts: 73
Joined: Wed Jul 19, 2017 8:50 pm
Zip Code: 48176
Tractors Owned: 1949 Cub
1972 Lo-Boy 154
1964 Cub Cadet Model 70
2005 New Holland GT20

Re: PTO vibration

Postby rcupka » Tue Aug 06, 2019 11:39 am

Any body experience this?

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


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