New Holland TC40A tractor problem

old · Sep 23, 2015

So have a problem with a guys diesel NH tractor. It will shut down with out any good reason that can be seen. It may start right back up or it may have to sit for a while. It is one with an electric key shut off. He has just changed the fuel filter. Thinking it is either the fuel lift pump or maybe a problem with the ignition switch of for lack of a better term the shut down solenoid.
Any body ever mess with one of these tractor?? And or have a clue as to why it will be running just fine that all at once die
Thanks

Cooter143 · Sep 23, 2015

I've got a TC-45 that did the same thing for a while. It acted like it was one of the safety shutoffs that would kill it momentarily, like if I stood up out of the seat without the brake on or with the PTO engaged. Sometimes it would recover on its own, other times I would just crank it right back up and keep going. It was doing that in the spring, but seemed to fix it self so I never figured out what was going on. Maybe someone has a good answer.

Steve@Advance · Sep 23, 2015

So did the problem start after changing the filter? If so, it's probably sucking air at the filter. Check the filter installation, fuel lines for cracks, loose fittings, everything between the tank and the lift pump, check the lift pump pressure and volume. Another trick is to temporary a piece of vinyl tubing between the lift pump and the injector pump, watch for air bubbles, must be solid fuel, no air. The lift pump it's self can introduce air, especially if there is any sign of the diaphragm leaking, just like a fuel pump on a gas engine.

old · Sep 23, 2015

The way I understand it was the fuel filter was changed in hope of it being the reason it was shutting down on them

w1ebb · Sep 23, 2015

Sounds like the seat safety switch. My TC35 used to do that occasionally when driving downhill. It was just enough wiggle in the seat and the seat switch to cut it off for just a second then it would catch again and run good.
I tightened up the seat hinge and repositioned the safety switch with a little epoxy.
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p>Good fortune!<p<

Scott

br>>Scott

TGIN · Sep 24, 2015

Clean the crud out of the bottom of the tank

CBBC · Sep 24, 2015

This sounds electrical...my neighbour has one and did something similar a year ago. I think there a fuse panel under the cover below the steering wheel. Clean and check all check all contact surfaces for the fuses, crud and dirt sits in there. Also as already mentioned by someone else, check the electric safety stuff on the PTO engager, seat and I think there is one on the clutch or parking brake.
Good luck, Grant

Bill in IL · Sep 24, 2015

We just had to replace a relay on our Workamaster 75. It was a relay (but a module with a fancy name)that all the safety switches reported to that then turned the fuel on in the injection pump. It was causing the tractor to not start from time to time and it did shut if off once or twice as well. I know the safety systems are probably pretty similar on your TC40A.

Can you locate the fuel shutoff solenoid on the pump and supply 12v to it. Effectively this would bypass all the safetys and allow you to see if the problem goes away.

Steve@Advance · Sep 24, 2015

Got to thinking afterward, an easy test for electrical would be to temporary a test light to the run solenoid connection on the injector. Se if the solenoid looses power when it quits.

Txsprigger · Sep 24, 2015

I have the same model and it did the same thing a year or so ago, the fuel tank had some crud in the bottom of it. I had to drain it, and blow it out both ways and that took care of the problem.

Wemedeeres · Sep 24, 2015

Mine used to do the same thing, I traced it back to the seat safety switch. Previous owner had jerry rigged it so you could get off the tractor with out shifting it to park and applying the parking brake. I took it apart and fixed it the right way.

mtf · Sep 24, 2015

Had a similar problem with a tb100. It would shut down, but would start right back up. The electrical system on the tb is much less complex than the tc40. Found the wires at the back of the ignition switch a little loose. It's either fuel or electrical. Good luck. Nathan

DGinVT · Oct 14, 2015

I have a NH TC34DA, a similar tractor and have found that the interlocks can be a problem, especially the ones under the left side of the operators seat. You have to get under the tractor and check each one out. Look for the interlock coming apart or hay or grass stuck in it. Also the one under the operators seat. It would help if you can get the operator's manual. Mine has a complete wiring diagram in it, without which I would be lost. Also you want to check out the fuse panel by pulling out each fuse and putting it back in again. A good volt/ohm is also very helpful. I use the old analog type(a Simpson 260)The fuel oil filter also bears watching, if it plugs you stop dead. I hope this helps some.

New Holland TC40A tractor problem

old

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Cooter143

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Steve@Advance

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old

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w1ebb

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TGIN

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CBBC

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Bill in IL

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Steve@Advance

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Txsprigger

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Wemedeeres

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mtf

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