We have a R72 with the LTA 10 engine, after a few operating hours the engine will drop back to idle and will not rev back to operating speed. The next day it will work again for a few hours before playing up again. I believe that the pump has been pulled off and checked three times now without finding a definite problem. Filters have all been changed.The combine is back in the shed now but we are not sure that anything has changed. Has anyone else had this problem?
Eng rev problem R72
1 - 6 of 6 Posts
This sounds more like a connection problem or issue with the throttle potentiometer in the cab. I would check it out first.
Beings your talking L10 you must have a '95 or prior machine. I have not heard of the problem you describe. The main electric power distributed to that engine is from little black relay under radiator and it was not as good of relay as the '96 and newer M11s used. I would just replace that relay. Other couple things that would be part of the Gleaner input to that engine would be the potentiometer that kswind mentioned or the tack module. I'm not sure what engine would do if you POT or relay went bad. I think what I would do is set engine a bit above idle and then unplug the relay and then the POT to see what engine does. Otherwise I would ask if you had any errors displayed on tack when you had the problem. You might be ready to just unplug the tack module when engine acts up again. You will lose the functions of tack when unpluged but you will find out if the engine will then rev up. You can sometimes pull up errors with Gleaner tack but I think you would be better off having Cummins pull them up with there system. I believe you can just send them the ECM that is fastened to pump if in off season and hopefully they find code that can point to engine going to idle. M11s have nearly identical setup so if someone has had this happen to their M11 equiped machine maybe they could help out. I wouldn't rule out the electric fuel solinoid on top of pump for we have replaced a couple of them but it seems to me the engine would not even run when it failed. Sure sounds as though relay, solinoid, or tack module heats up over time and shorts out. Maybe a willing neighbor with L10 equiped machine would swap you ECMs to eliminate that as a posibility. Good luck
nddan and kswind, thanks for your replies and after talking to the operators today I found out that an error code 514 was showing up. Now I am told Cummins have said that that it is a throttle code so the potentiometer is sounding like the culprit. The relays under the radiator have been changed to work a lot better a long time ago. Yes it is a 95 model, but it has been such a good machine we kept it while trading machines that we bought after the 72. Sometimes you get a machine that seems to have a soul and this is one of them.
Thank you, an email was sent.
ausfarmer
I was a mechanic in a local shop here and most of the problems that occurred with that engine was caused by the controller in the injection pump, that pump should have a round controller with two wires that pushon from the top, the wires also have 90degree terminals on them comes in from the front of the injection pump, but most of time it would act like what you are describing on the rpm not revving up or surging, but sometimes didnt log a code, I would pursue the fault code first and if you dont come up with anything I would look at the injection pump controller, I have also replaced the ecm which is mounted on the injection pump, black rectangular box about 4 inches wide by 6 inches tall about 1 inch deep has a rectangular wiring harness going in with 2 small screws going in, there is not a good trouble shooting for these items, if you need more info email me and I can tell more of what I know, I have had guys tell me that they pulled the controller out and cleaned it and fixed it, Cummins has connectors to replace the ones on harness cause they lose contact they will feel like they are tight but it is the plastic holding tight and not the electrical connector, Cummins wasnt very fond of that system, I have replaced those pieces and last resort and fixed them, I am not sure what price they get for them now but they werent something you just wanted purchase to have around. This may not help but keep it in mind when you are running them, if you get alot of fault codes the battery connections are very important to BE CLEAN not just look clean this doesnt sound like it is the problem though
I was a mechanic in a local shop here and most of the problems that occurred with that engine was caused by the controller in the injection pump, that pump should have a round controller with two wires that pushon from the top, the wires also have 90degree terminals on them comes in from the front of the injection pump, but most of time it would act like what you are describing on the rpm not revving up or surging, but sometimes didnt log a code, I would pursue the fault code first and if you dont come up with anything I would look at the injection pump controller, I have also replaced the ecm which is mounted on the injection pump, black rectangular box about 4 inches wide by 6 inches tall about 1 inch deep has a rectangular wiring harness going in with 2 small screws going in, there is not a good trouble shooting for these items, if you need more info email me and I can tell more of what I know, I have had guys tell me that they pulled the controller out and cleaned it and fixed it, Cummins has connectors to replace the ones on harness cause they lose contact they will feel like they are tight but it is the plastic holding tight and not the electrical connector, Cummins wasnt very fond of that system, I have replaced those pieces and last resort and fixed them, I am not sure what price they get for them now but they werent something you just wanted purchase to have around. This may not help but keep it in mind when you are running them, if you get alot of fault codes the battery connections are very important to BE CLEAN not just look clean this doesnt sound like it is the problem though
1 - 6 of 6 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
The Combine Forum
A forum community dedicated to all combine owners and enthusiasts. Come join the discussion about specifications, accessories, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
Join now to ask and comment!
