| Author |
Message |
    
Greg Smith
Member
Username: Nothingbutgreenmachine
IN
Registered: 5-2010
Post Number: 21
| | Posted on Wednesday, July 14, 2010 - 12:01 pm: | 
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I think the rear PTO on my tractor gave up the ghost today. There was a burnt rubber smell and smoke started rolling out the rear fender. I shut it down and I was using the material collection system at the time. By the rear PTO I mean the clutch assembly that is under the fender not the 2000 rpm box (I do not have that). My question is, is it possible to burn up those PTO units, since I thought it was engaged and had been working for about 40 minutes I don't know why it would all of a sudden go out. Sound right or is there something else that is to blame? I have previously used it on my tiller too for a couple of years no problems till today. |
Chuck Van Dusen
Member
Username: Chuckv
OR
Registered: 1-2007
Post Number: 3779
| | Posted on Wednesday, July 14, 2010 - 12:54 pm: |
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Greg,
The rear PTO clutch/brake assembly is essentially the same as the front PTO in that it is an electric coil that magnetically actuates the driven plate to be in contact with and drive plate. It is possible for the coil to become internally shorted and give off a "burned" smell and some smoke. Also, if the bearings have failed, the moving parts can rub on the fixed coil and this can cause the odor and the shorting. One other thing that is not as common with the front PTO is that the rear one can also have its wiring tangle in the rotating shaft with predictably damaging results...
Here is an exploded parts diagram of the assembly:
You will need to take the fender pan off and inspect the assembly. Unplug the harness and measure the resistance of the coil to ground -- it should be in the range of 3.5 to 4.9 ohms. Most likely it is zero of nearly so indicating a short.
Here is the statement from the Installation manual regarding keeping the wiring clear of the rotating parts.
Good luck and let us know what you find...
Chuck |
Jake Knudslien
Member
Username: Northernjake
AB
Registered: 6-2007
Post Number: 138
| | Posted on Wednesday, July 14, 2010 - 1:16 pm: |
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You didn't by chance just burn up a belt did you? That would be the "best case scenario".
Jake |
Greg Smith
Member
Username: Nothingbutgreenmachine
IN
Registered: 5-2010
Post Number: 24
| | Posted on Friday, July 23, 2010 - 12:02 am: |
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Okay here is what I found. When I tried to turn the PTO by hand it had a catch in it and by the looks of the coil it appears the coating was melting which caused the smoking and the PTO to start and freeze up due to the debris.
Here is a photo of a spare PTO I have. Much better condition.
I wanted to point out on the spare PTO which was for the MCS (one pulley) the PTO had a spline shaft and coupler.
But on the tiller (double pulley) there was a straight shaft that the bearings had spun on the shaft making it rattle. Here is a picture of the spline cover and shaft that would attach to the back of the PTO.
Bad shaft.
New expensive shaft.
And hopefully I will be able to get back to this! Thanks Chuck for the diagram as well!
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