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- Boston, MA
My M1010 suddenly developed a powerful vibration at low RPM, whether parked or moving. I had things running smoothly and quietly, until a few days ago. Now it's smooth and quiet above about 820 RPM, and it vibrates violently below that.
https://youtu.be/DAg0p8qhiOM
I did a search, and read a bunch of threads about this. I still could use some guidance from those with more experience.
At first I thought it was a loose belt, but the tensions are correct. The upper alternator belt does vibrate, as usual, but it was pretty quiet until a couple of days ago. Here is a shot of the alternator belts:
https://youtu.be/wSw4cfK8Da0
I've read about the harmonic balancer causing vibration problems. John at Hillbilly Wizards checked mine out at 2,500 miles and said it didn't need to be replaced. The truck has 6,000 miles now, but I see nothing moving in the balancer:
https://youtu.be/2ruydbnJzSM
And here's a shot looking down the P/S and A/C belts.
https://youtu.be/cu6lSzGQMCk
The belt tensions are correct. The air filter bolts are tight.
Unless someone has a better idea, my next step will be to remove all the belts and see if it still vibrates. If not, I'll add them back one at a time until the problem returns. I hate to do this, though, since I just got the new belts all broken in and set to proper tension...
I'm hoping someone who knows these trucks will see or hear something in these videos that will give me a direction to pursue.
Thanks,
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https://youtu.be/DAg0p8qhiOM
I did a search, and read a bunch of threads about this. I still could use some guidance from those with more experience.
At first I thought it was a loose belt, but the tensions are correct. The upper alternator belt does vibrate, as usual, but it was pretty quiet until a couple of days ago. Here is a shot of the alternator belts:
https://youtu.be/wSw4cfK8Da0
I've read about the harmonic balancer causing vibration problems. John at Hillbilly Wizards checked mine out at 2,500 miles and said it didn't need to be replaced. The truck has 6,000 miles now, but I see nothing moving in the balancer:
https://youtu.be/2ruydbnJzSM
And here's a shot looking down the P/S and A/C belts.
https://youtu.be/cu6lSzGQMCk
The belt tensions are correct. The air filter bolts are tight.
Unless someone has a better idea, my next step will be to remove all the belts and see if it still vibrates. If not, I'll add them back one at a time until the problem returns. I hate to do this, though, since I just got the new belts all broken in and set to proper tension...
I'm hoping someone who knows these trucks will see or hear something in these videos that will give me a direction to pursue.
Thanks,
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