NX4510 HST RPM's Dropping CEL light

[JimR]

Today I am out chipping brush when my tractor rpm's drop down to 1500 then go to an idle. I'm running the PTO at 540rpm's. I closed the throttle and start to raise it until the motor won't go any higher. The rpm's made it to 2000 rpm's before the CEL light came on and the motor dropped back to an idle. Moving the throttle back down to mid range causes the motor to rev back up, but only to 2000.. If I go any higher the CEL light comes on and the motor returns to an idle. I then checked the air filter. It is clean, as in like new. Next I unscrewed the water drain plug on the fuel filter. There is no water in the fuel. I decided to run a regen cycle on the tractor. The throttle lever is at an idle. The motor ran at 1500 rpm's for about 10 minutes. Then it automatically switched over to 2600 rpm's for a good 20 minutes. Then it switched back to the 1500 rpm's and finally back to an idle. I figured that I would be all set now as it ran at 2600 rpm's for a good 20 minutes. That was not the case. I cranked the rpm's back up to 2000 with no issues. As soon as I go over that the CEL light comes on solid and the rpm's drop to an idle. Does anyone have an idea as to what would cause this insanity with my tractor. Right now I am letting it cool down. I'm going to disconnect the battery to see if that will reset the ECM and try it one more time in about an hour.

 

[JimR]

I went out and without doing anything fired my tractor up. It ran fine for an hour using the chipper. Then out of the blue it started acting up all over again. The highest rpm's that I could get was 2000. I'll try it again tomorrow. This time I'll pull the battery cable. This is really starting to irk me. This tractor only has 317 hours on it.

 

[CMV]

Do you get an ERR code at the hour meter? That might help track it down.

This time of year I have to do more frequent grille and radiator screen cleaning due to dust & "fluffy" weed seeds - temp gauge look good?

 

[JimR]

Do you get an ERR code at the hour meter? That might help track it down.

This time of year I have to do more frequent grille and radiator screen cleaning due to dust & "fluffy" weed seeds - temp gauge look good?

I didn't even think of looking there as I didn't know it had codes that showed up. I'll go out and try to make it do it again now.

 

[YLee Kioti]

Keep us posted...I'm at the 200 hour mark and getting ready for R&R of hyd. fluid and filters plus fuel filter.

 

[MinnesotaEric]

When was the last time you regenerated?

 

[JimR]

My tractor is a 2014. The tractor was doing the same thing for 5 minutes tonight after startup. I kept flipping the throttle from idle to full position. It went up to full throttle for about 5 minutes and dropped back down to an idle. Then it started to cycle from idle to PTO throttle all by itself. It did this for about 5 minutes then went to an idle. I then pulled the throttle back to idle and ran the re-gen cycle. Afterwards it would not go over 2000 rpm's. There was no error code on the hour meter.

 

[JimR]

When was the last time you regenerated?

Hi Eric, I had a re-gen light once at around 75 hours. I ran it then but never since.

 

[MinnesotaEric]

Hi Eric, I had a re-gen light once at around 75 hours. I ran it then but never since.

Warm it up and manually regenerate it. I think your exhast filter is plugging up your machine. That is what happened to my machine.

 

[JimR]

Warm it up and manually regenerate it. I think your exhast filter is plugging up your machine. That is what happened to my machine.

I did that again tonight and it didn't make any difference. ?????? Is there a OBD2 plug on this machine? During the regen it ran for almost 30 miutes at 2600 rpm's. The exhaust is not plugged. It might be getting a bad reading which is putting it into limp mode.