Unless you crank your engine over a couple of minutes before starting you are in effect try starting your engine as far as oil flow I use 100 percent synthetic oil ..have no problem with oil flow...? ....
Alternator Belt
- Thread starter Kc8ehd
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Unless you crank your engine over a couple of minutes before starting you are in effect try starting your engine as far as oil flow I use 100 percent synthetic oil ..have no problem with oil flow...? ....
Have no doubt That I will , never seen this before during all my years with diesels ... just thought maybe someone here might have an ideal as to what causing this being this is a LS tractor form. ... Some good ideals but so far none has located the issues ....
Doing some brainstorming here:
I suspect a bad alternator bearing that doesn't show problems except after a certain degree of side load. Maybe this will work without taking it to a shop to be tested.
Take the belt off the alternator. Put it back on the alternator pulley only with the rest hanging off the side of the tractor. Hold both sides of the belt and pull hard on it back and forth to spin alternator a bit with a strong side load on the bearings.
Or if you can rig up a rubber wheel in an electric drill, use it to spin the alternator while side loading it.
Bruce
LouNY
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What size is your alternator? 50-60 amp or 100+.
If you are pulling the battery way down and then the alternator is maxing out, it would be pulling hard.
Is your alternator pulley polished or glazed?
Is your belt the right width for the pulley? I have seen belts that were to narrow and would run in the bottom of the pulley, if they do they have very limited power transfer, they need to grip the sides of the pulley. If it has a half inch wide belt try a 5/8 width one.
If you are pulling the battery way down and then the alternator is maxing out, it would be pulling hard.
Is your alternator pulley polished or glazed?
Is your belt the right width for the pulley? I have seen belts that were to narrow and would run in the bottom of the pulley, if they do they have very limited power transfer, they need to grip the sides of the pulley. If it has a half inch wide belt try a 5/8 width one.
Book calls for "A" belt did look a bit small for the pulley but that's what came from factory...Don t knothinkw about the amps will check when I place the altnator on a tester this evening...Thinking you may be on to something
frugalangler
Gold Member
If a belt is too small even if it's set to 'factory tension' it will slip under load, it requires the squeeze of a V groove to create friction, and the groove has 2X the amount of surface area that the bottom of the pulley has, so a wider belt may well cure the issue, I've actually seen this on mower decks where folks have replaced with the correct length belt but too narrow and it will smoke in heavy grass load.
Just got a call back from dealer , factory rep thinks it's the air pump , kind of doubt it being it's not driven by this belt ,will check to be sure , if it was locked parts from it's belt could have damage the fan /alternator belt..seems they have history of getting water in them and locking up when below freezing......
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
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
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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.
