2640 Starting Issues

[Pilothawk]

I have a 2640 that has me flustered. I can leave it for weeks and when I go to start it, it starts fine. After I start it up and drive it over to put on an implement....it will not start back up. In fact, it barely turns over, and that is even if it has been run for an hour or more. I can be mowing for a couple of hours, come back in for a drink and the darn thing will not start. If I leave it sit for an hour or so it will turn over weakly and likely start. I can put the charger on it and get it to start.

Alternator is putting 13.5v into the battery. Battery has been replaced, My partner seems to think it is low compression but that makes zero sense to me since it would turn over fine but not fire off if it was just a compression issue.

I plan to pull the starter off and take it in to see if that is the issue. Any other ideas/suggestions?

 

[MSM]

More than likely the hydraulic pump is not destroking and dragging the starter down. Try moving the steering wheel side to side while cranking,this will relieve hydraulic pressure. If this makes it easier to start,you can use the manual destroke valve on the pump to unload the pump or add an electric destroke valve to the pump which engages when the key is turned to the start position.

 

[twopop]

it was on a 4640,but when the starter would get hot from engine heat,it would not turn properly

 

[buickanddeere]

With the tractor out of gear. Will the starter operate when hot when given the old "short her out with a screwdriver" trick?

 

[Bushed]

(quoted from post at 15:11:52 08/16/08) I have a 2640 that has me flustered. I can leave it for weeks and when I go to start it, it starts fine. After I start it up and drive it over to put on an implement....it will not start back up. In fact, it barely turns over, and that is even if it has been run for an hour or more. I can be mowing for a couple of hours, come back in for a drink and the darn thing will not start. If I leave it sit for an hour or so it will turn over weakly and likely start. I can put the charger on it and get it to start.

Alternator is putting 13.5v into the battery. Battery has been replaced, My partner seems to think it is low compression but that makes zero sense to me since it would turn over fine but not fire off if it was just a compression issue.

I plan to pull the starter off and take it in to see if that is the issue. Any other ideas/suggestions?

Maybe check the brushes in the starter for wear. Sometimes if they are worn down they will work OK when cold and as they heat up and things expand they stop making proper contact with the commutator. Sort of like a heat activated switch.

Also get the windings in the armature and stator checked for shorts. Same thing again as I said before, if there is a fault, things come play up as they heat and cool.
Aussie

 

[John Heine]

I would say hyd pump not destroking.On the JD industrial they used electric destroke valve when you used starter voltage went to sol on destroke valve.

 

[Anonymous-0]

We run 2 batteries on almost all tractors with each one running to the starter...sounds like starter



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