5045 will not start

[Mike5045]

I have a JD 5045 that will not start. Lights come on, started does not turn over. Checked fuses, 10 amp starter relay fuse blown, replaced and it blew it as soon as I turned the key on. Any Ideas
Thanks Mike

 

[JD5210]

Looked at the 5045 operators manual and it does not show all the things on that fuse, but lets give this a try worst case you blow another fuse.

The problem maybe the thermistor sensor (thermistors are temperature variable resistors used as sensors.). On the thermostat housing there is a sensor that is connected to a two wire harness that goes to the injection pump; this is the "cold start advance" portion of the system so it starts easier when cold by advancing the timing.

When the sensor on the thermostat housing fails it shorts out and blows the fuse. Try unplugging it, replace fuse and see if it starts and runs. The part # is RE503242, if you are quick changing it, you don't have to drain the coolant, just make sure it's not hot at the time. You will want a pan under the tractor to catch the coolant, so as not too have to clean it up.

To comply with the exhaust emissions regulation, the timing of injection pump should be around 6 to 9 degrees before TDC. These timing values do not allow proper start-up operations when engine is cold. To ease engine start-up, a cold advance system gives to the injection pump a temporary over-timing.

When coolant temperature is below 50 C (122 F), the solenoid valve is activated and opens the cold advance circuit.

Look up the part on JD parts, and it will help you locate it. I have also attached a picture of it.

URL to JD parts

John Deere - Parts Catalog

 

[Mike5045]

Thanks I will give it a try

 

[Jim Timber]

5045's timing is .5 degrees after top dead center. They really neutered these with Tier 2.

 

[Mike5045]

That was it. unhooked the thermistor, popped in a new fuse and she cranked right up. I did notice a very fine leak where the wires are coming out of the thermistor, probably what caused the short to begin with . Thanks a million for the advice and knowledge.

 

[jed1894]

I have the same problem and just found this thread after I posted the problem. Any got a picture of where this sensor is located on the thermostat housing? Thanks jed

 

[jed1894]

Unplugged the sensor and it cranked. Great site !!!

 

[The Good Ag]

Thanks for info, disconnected and we are now running. Part will be ordered presently

 

[LPB3]

Same symptoms on my 5045 this morning. After several hours of diagnostic efforts I found this thread. Machine fired right up after disconnecting the suggested connector. THANKS MUCH FOR THE SUPPORT!!!!

 

[Turbine Driver]

Looked at the 5045 operators manual and it does not show all the things on that fuse, but lets give this a try worst case you blow another fuse.

The problem maybe the thermistor sensor (thermistors are temperature variable resistors used as sensors.). On the thermostat housing there is a sensor that is connected to a two wire harness that goes to the injection pump; this is the "cold start advance" portion of the system so it starts easier when cold by advancing the timing.

When the sensor on the thermostat housing fails it shorts out and blows the fuse. Try unplugging it, replace fuse and see if it starts and runs. The part # is RE503242, if you are quick changing it, you don't have to drain the coolant, just make sure it's not hot at the time. You will want a pan under the tractor to catch the coolant, so as not too have to clean it up.

To comply with the exhaust emissions regulation, the timing of injection pump should be around 6 to 9 degrees before TDC. These timing values do not allow proper start-up operations when engine is cold. To ease engine start-up, a cold advance system gives to the injection pump a temporary over-timing.

When coolant temperature is below 50 C (122 F), the solenoid valve is activated and opens the cold advance circuit.

Look up the part on JD parts, and it will help you locate it. I have also attached a picture of it.

URL to JD parts

John Deere - Parts Catalog

Father-in-Law's 5045E had this same issue with blowing the starter fuse, I replaced the Cold Start Advance Thermistor this morning and tractor fired up as normal after replacing the 10amp fuse. Part was $50.72 + tax. The part is in a tight area that required grinding down the outside circumference of a 7/8" box end wrench in order to get it on and loosen the failed original thermistor. This forum's members helped save my FIL quite a bit of $$$ and prevented lost use of his tractor during hay feeding season. Awesome!