Air pump had slipped , alternator checked out electrically bearings could still be bad ...next step is to wait for some clod weather and have someone start the tractor while I watch the pump and alternator pulleys ....marked both with paint pen ..waiting on some old weather...when all else fails return to the basics
Alternator Belt
- Thread starter Kc8ehd
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mbis
Member
Done that. Just back from John Deere they say my radiator is the problem
Only have trouble in cold weather , check with a mechanic ,he thinks something is breaking down in the alternator when dips below freezing , LS has sent me a replacement ...going to install and send the old one to a local repair shop for a full rebuild an see if they can locate the problem.....got to love LS some other brands would have left me holding the bag.....
Hopefully, this will solve your cold weather starting problem. Very odd problem, to say the least. Glad LS is stepping up.
mike48130
Platinum Member
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When the belt is slipping get a IR temp gauge and see what pulley is hot. If it is the alternator I would suspect you have some sort of short that is causing the field to be on full at crank. How is that air pump driven? When it won't crank loosen the belt and see if it starts. Then check each pulley to see what is tight. Might be tight only under a load of a bearing is going and binding when a side load is applied but I would think you would feel some roughness. If you think it is the alternator you can pull the connector to the back as well to se if that changes anything
Peter 315
Super Member
Nice:thumbsup:
Great news. Please keep us posted on what they find.
Alternator and water pump are on a common belt .
Air pump his it's own belt
The air conditioning pump has its own belt also and all tree are a diffent size....
PILOON
Super Star Member
Hah, have followed this discussion.
I'd venture a wild guess that the cold shrinks a bushing in the alternator to the point of seizure.
OK, a wild guess but for sure a possibility.
Only 2 things run on that belt. Alternator and water pump and you eliminated the pump.
What else could burn up a belt? also the new alternator now runs OK.
So, sounds like a good polishing of the alternator shaft and or reaming of the bushing would cure the problem.
Generally alternators have a ball bearing at front end with bushing at the rear.
On the positive side it sounds like U have a responsible dealer.
I'd venture a wild guess that the cold shrinks a bushing in the alternator to the point of seizure.
OK, a wild guess but for sure a possibility.
Only 2 things run on that belt. Alternator and water pump and you eliminated the pump.
What else could burn up a belt? also the new alternator now runs OK.
So, sounds like a good polishing of the alternator shaft and or reaming of the bushing would cure the problem.
Generally alternators have a ball bearing at front end with bushing at the rear.
On the positive side it sounds like U have a responsible dealer.