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npalen

PTO driveshaft rattle

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npalen
ALLIS 720/PowerMax I'm getting an "on-and-off-again" rattle that I'm guessing is coming from the PTO driveshaft between the engine and the PTO clutch. Haven't had time to investigate yet but wondering if anyone's experienced this and a possible solution. Seems like something might be out of balance. Thanks Nelson

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eagle5473
I had a vibration as well, and just disconnected the rear PTO drive shaft, as I dont currently have a use for it your situation may be different

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npalen
The rattle stops when the clutch is depressed so I'm now thinking it's a bad bearing or sheave driving the hydro. I don't normally use the clutch (belt tightener) and didn't realize the noise stopped when doing so. What else might be bad in the drive ahead of the hydro? Comments?

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npalen
Would anyone have the part nos. for the pivot bushings for the tightener and the fiber disc as well as a source? I assume the ball bearings can be purchased locally. Haven't opened it up yet but would like to have the parts on hand when I do. Thanks Nelson

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UCD
Rick on your file name delete the name off from the end and if the second number past tp is a 3 digit number 390 insert a 0 zero making it a 4 digit number 0390 IE the edited link in your above post

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UCD
They are the same tractors. There is a few differences between the model numbers 990705 Simplicity 4040 = 2020185 Allis Chalmers 616 16hp. Onan 990953 Simplicity 4041 = 2020303 Allis Chalmers 620 20hp. Onan 990954 Simplicity 4041 = 2020304 Allis Chalmers 620 20hp. Onan 1690072 Simplicity 9020 = 1690073 Allis Chalmers 720 20hp. Onan 1690230 Simplicity 9020 = 1690231 Allis Chalmers 720 20hp. Onan 1690283 Simplicity 9020 = 1690288 Allis Chalmers 720 20hp. Onan The best way to find the differences in parts would be to download the parts manuals and check for differences in part numbers.

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UCD
You can download manuals on the main page by typing the MFG# into the Search for Manuals at Simplicity Mfg. Box in the upper right corner or at this site. http://www.simplicitytechpubs.com/techpubsearch.php#start

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