Crank no start

[guy25]

Tractor was running fine when parked. 2 days later it will turn over but not start. Has fuel and fuel is free flowing from bowl. Any ideas?

 

[CobyRupert]

Diesel? Does it have glow plugs? Do you get smoke from the exhaust?
Did it recently get colder?

 

[Hoss710]

what model tractor?

 

[guy25]

2007 new holland tc 40da. Diesel, no smoke from exhaust and temp outside is in 50s

 

[dlctcg]

I would first check the Seat Switch & the the Parking Brake Switch...

On the NH TC series the seat switch and the parking brake switch will not stop the engine from turning over however they cause the Fuel Solenoid to shut off. This will allow the engine to crank but not start.

You should also check to see if the Fuel Solenoid is activating when the key is turned run position. The fuel solenoid is on the right side of the tractor. If you set the parking brake and turn the Key to the ON position, you should hear it click.

 

[guy25]

I would first check the Seat Switch & the the Parking Brake Switch...

On the NH TC series the seat switch and the parking brake switch will not stop the engine from turning over however they cause the Fuel Solenoid to shut off. This will allow the engine to crank but not start.

You should also check to see if the Fuel Solenoid is activating when the key is turned run position. The fuel solenoid is on the right side of the tractor. If you set the parking brake and turn the Key to the ON position, you should hear it click.

Seat switch is good. I hear no clicks on the solenoid though. I was wondering if there might be a fuse or relay. I checked the main fuse 40 Amp on left side by starter and it is good

 

[dlctcg]

I can't say your TC40DA is the same as the diagram shown... but if it is the fuse would be Fuse #2 but I don't think yours is bad; usually if Fuse #2 is bad the tractor won't crank at all... but worth checking

 

[dlctcg]

You can also check the Fuel Shut-Off Relay... Again, I can't say your TC40DA is the same as the diagram shown... but if it is, it would be Relay #4.

You can swap it with a like relay to see if that is the problem...

Just wondering.... How did you test the Seat Switch??

 

[guy25]

I can't say your TC40DA is the same as the diagram shown... but if it is the fuse would be Fuse #2 but I don't think yours is bad; usually if Fuse #2 is bad the tractor won't crank at all... but worth checking



View attachment 782825

This is what mine looks like

 

[Hoss710]

If it were me I'd pull out 1 relay at a time and clean the sockets with contact cleaner . And reseat ur relays to start. lots of dirt there that can give you a bad connection.

 

[guy25]

If it were me I'd pull out 1 relay at a time and clean the sockets with contact cleaner . And reseat ur relays to start. lots of dirt there that can give you a bad connection.

I actually just did that, I am searching for the bleeder screen for fuel now , all the videos I'm seeing are different than mine

 

[thclimer]

This might be a referance for the relay locations as well:

 

[guy25]

This might be a referance for the relay locations as well:

That looks like what I have. Thanks, I will try and replace the relay tomorrow.

 

[thclimer]

That looks like what I have. Thanks, I will try and replace the relay tomorrow.

If you have 12 volt source and a volt/ohm meter you can test the relays, see attached.

 

[guy25]

If you have 12 volt source and a volt/ohm meter you can test the relays, see attached.

I have replaced all the relays and still no start

 

[Boss 302]

On the number 6 relay in the picture (Fuel shutoff) while turning the key to the on position see if the relay clicks by putting your finger on it. If it doesn't I would make sure all fuses are good and if they are it could be a defective ignition switch.

 

[Jerry/MT]

Do you have voltage at the fuel shut off solenoid now that you replaced the relays? If you do and the solenoid isn't opening the fuel valve, you have a bad solenoid. There are normally 2 solenoids; an opening solenoid and a holding solenoid and both must be working.
If you don't have voltage at the solenoid then the problem could be a broken wire, bad connection etc since you replaced the relays.

 

[guy25]

Do you have voltage at the fuel shut off solenoid now that you replaced the relays? If you do and the solenoid isn't opening the fuel valve, you have a bad solenoid. There are normally 2 solenoids; an opening solenoid and a holding solenoid and both must be working.
If you don't have voltage at the solenoid then the problem could be a broken wire, bad connection etc since you replaced the relays.

I was told I could run a hot wire to the solenoid or just pull the solenoid to start. Is this correct?

 

[guy25]

Do you have voltage at the fuel shut off solenoid now that you replaced the relays? If you do and the solenoid isn't opening the fuel valve, you have a bad solenoid. There are normally 2 solenoids; an opening solenoid and a holding solenoid and both must be working.
If you don't have voltage at the solenoid then the problem could be a broken wire, bad connection etc since you replaced the relays.

I will check that when I get home. Thanks

 

[Jerry/MT]

I was told I could run a hot wire to the solenoid or just pull the solenoid to start. Is this correct?

How many wires on your solenoid. Usually there are two so you will have to run two wires. Don't anything about your specific solenoid but give it a try. It can't hurt anything.