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My IH backhoe, runs great fot 15 min. then shuts itself down

A

Anonymous-0

Well-known Member
My 3414 runs great, however, lately, it only runs for 15/20 minutes spurts, then it shuts itself off, especially if i idle up to increase the RPM's. The coil gets very very hot, which i replaced, and the new coil gets hot still, and the motor still shuts off after about 15 minutes of work.
Cleaned the carburator, fuel filter, cleaned fuel pump, new spark plugs & wires, cleaned air filter, but the problem persists. After letting it sit for awhile, it starts fine and runs great for another 15 minutes, and the frustrating cycle continues.
 
That is classic overheating coil.

Since the new coil is getting hot as well, your coil is receiving 12V when it should only be getting 6V.

Did you do any rewiring recently?

Tractors of that era usually had a "boost" circuit that provided 12V to the coil during starting. It can be incorporated into the key switch, or it may be drawn off the solenoid at the starter, or if the tractor's new enough, it may be a relay that is activated by the starter button. I am not familiar with your tractor model so I don't know which it could be.

Perhaps the boost circuit is getting stuck on?

The other possibility is the ballast resistor failed, or has been removed.

Replace the ballast resistor, or replace the coil with one specifically designed for use with 12V without a ballast resistor.
 
Don't rule out a fuel issue. But if yours has a fuel pump then that is easy to check.

However, check for spark after it dies then you know.

You need about 3 ohms of resistance. If you have a 6v coil then a Napa ICR13 resistor adds an addition 1.8 ohms to get there. Or use a 12v coil with internal resistance, the Napa IC14 coil.

Let us know if you have spark right after it dies.
 
Thank you for your help with my IH 3414 backhoe. I replaced the fuel pump and blew out the fuel lines, to eliminate the fuel issue. I replaced the coil with a 12volt coil with a built-in ballast resistor. I do get a spark from the coil after it shuts off. The coil doesn't feel hot anymore, unfortunately, it still shuts itself off after about 15 minutes.
 
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