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Reload this Page 1250 Bad shaking when front PTO engaged
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  #21  
Old 09-26-2017, 11:50 PM
Dart1917 Dart1917 is offline
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Location: Illinois
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Pull the tunnel cover and checkout the driveshaft. I'm thinking the mower has nothing to do with it. The driveshaft is always spinning at engine speed and if it goes out of balance turning the pto off won't help but idling back the engine will. The shaft should go into the bearing at the rear coupler on the hydro pump. If it's short and not going into the bearing the only thing holding it centered is the rag joint. Who knows what one of the PO's did to the driveshaft. Good luck

Went back and re-read the original post- missed the part about a u-joint at the rear. A lot of u-joints aren't made for 3600 rpm. I think that may be where the problem is, or at least another place to look if you can't find anything wrong with the mower.
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  #22  
Old 09-27-2017, 10:57 AM
twisties twisties is offline
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Quote:
Originally Posted by Dart1917 View Post
Pull the tunnel cover and checkout the driveshaft. I'm thinking the mower has nothing to do with it. The driveshaft is always spinning at engine speed and if it goes out of balance turning the pto off won't help but idling back the engine will. The shaft should go into the bearing at the rear coupler on the hydro pump. If it's short and not going into the bearing the only thing holding it centered is the rag joint. Who knows what one of the PO's did to the driveshaft. Good luck

Went back and re-read the original post- missed the part about a u-joint at the rear. A lot of u-joints aren't made for 3600 rpm. I think that may be where the problem is, or at least another place to look if you can't find anything wrong with the mower.
I can certainly try that and check it out. The only reason why I don't think it's the drive shaft is it has NEVER happened unless the PTO is engaged first (but maybe that's enough to throw it out of whack?). I driven it around for 15 or 20 minutes and it's smooth as can be until the PTO is engaged.

Will be at least tomorrow till I get a chance to mess with it. I'll certainly follow up on all the suggestions and report back.
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  #23  
Old 09-27-2017, 11:15 AM
finsruskw finsruskw is offline
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PTO bolts loose on the front of the engine?
one or more adjusting springs broken or missing?
Loose engine mount bolts?
Loose or missing engine cradle mounts/bolts?
I agree w/Jon, some thing THIS BAD should not be hard to find ad should be fairly obvious upon closer inspection.
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  #24  
Old 09-27-2017, 11:58 AM
twisties twisties is offline
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Quote:
Originally Posted by finsruskw View Post
PTO bolts loose on the front of the engine?
one or more adjusting springs broken or missing?
Loose engine mount bolts?
Loose or missing engine cradle mounts/bolts?
I agree w/Jon, some thing THIS BAD should not be hard to find ad should be fairly obvious upon closer inspection.
More things to check. When I adjusted the air gap all the springs were present.

I've got a copy of the owners manual, it really doesn't get in to much detail, I need to try and find a service manual. Can anyone point me to an online version? Or at least some parts diagrams? It's so hard to get in there around the PTO I'm not even sure how it mounts to the motor.

I've had the driveshaft cover off, I don't recall trying to engage the PTO at that point but while just running it was fine/smooth. I mentioned in an earlier post this seems to be coming from the front of the tractor, not the rear but who knows.
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  #25  
Old 09-27-2017, 01:04 PM
J-Mech J-Mech is offline
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Did you read my post #20? Check the engine mounting.


Chassis manual can be found here:
http://www.onlycubcadets.net/forum/s...ead.php?t=4644
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  #26  
Old 09-27-2017, 01:17 PM
twisties twisties is offline
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Originally Posted by J-Mech View Post
Did you read my post #20? Check the engine mounting.


Chassis manual can be found here:
http://www.onlycubcadets.net/forum/s...ead.php?t=4644
Yep, All that is on my list to check.
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  #27  
Old 09-27-2017, 01:45 PM
finsruskw finsruskw is offline
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4 special bolts hold the brake flange to the block.
The springs you said you checked go over them and the bolts recieve 3/8" fine thread ny-lock nuts.
That is how the correct gap is adjusted. .010"
The service manual you need is GSS-1464 w/revision 2 Sept 1979
Pages 2-81A thru 2-81B
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  #28  
Old 09-27-2017, 01:48 PM
J-Mech J-Mech is offline
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4 special bolts hold the PTO to the block.
Those bolts just hold the coil to the block. If it was loose, engaged or not, it would not cause a vibration. PLUS, it would screech and squeal because the PTO rotor would be hitting it, causing all kinds of noise and heat. The PTO rotating assembly is held on with the center bolt through the crank.
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  #29  
Old 09-27-2017, 02:13 PM
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Green stripe wide frame Green stripe wide frame is offline
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I agree with engine mounts on this one.
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  #30  
Old 09-27-2017, 02:17 PM
finsruskw finsruskw is offline
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The bolts hold the brake flange to the block.
And they are somewhat special in that the are coarse thread on one end and fine thread on the other plus the flange head in the center of the bolt
I stand corrected.
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