CX820 Combine Engine Oil problem

[Mafarmer]

Hi,

I'm looking for a bit of help with my New Holland CX820 combine. The combine is fitted with a New Holland 675 ta engine and has done 3200 engine hrs. it was serviced at the start pf the season. Problems started in August mid season when the combine shut down with high engine oil error code whe cutting wheat. We let it cool down and restarted and it ran perfectly. Oil pressure showed 3.5 bar cold but then fell to 2 bar as it warmed up and then shut down again. We changed the engine oil and this seemed to cure the problem, oil pressure maintained at around 2.8 bar and the combine did another 100 acres. at this point the combine dropped oil pressure again and shutdown. We didnt have time to try to fix the combine so we hired a machine in and completed the season.

Now with more time I need to either pull the engine to get it rebuilt or try to find what is causing the oil temp problem. I wondering if it maybe an oil cooler problem or similar or maybe its just a worn oil pump? Coolant temp remains constant until oil temp starts to go up then rises as oil temp goes up, Rads are clean so I dont think its a water cooling issue. Dont think its a sensor problem as the machine clearly feels hot after shutdown. It runs fine now but seems to play up when pushed hard and I my season won't stand another season with the same grief!

If anyone has had a similar problem or can shed some light on this please feel free to share thoughts.

Thanks in advance

James



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[nelson]

have you phone aph they deal with alot of combine

 

[goldeneagle]

I would start by doing the simple things first. Either replace the engine oil sensor or install a tee piece beside it to see if it is reading correctly against a manual gauge. Your sensor is potentially twenty years old and doubt its ever been calibrated since it left factory.
Does the combine not have two switches i.e proportional gauge to give you the oil pressure on screen then a safety switch which below a set pressure to kill engine.

As for the oil temperature what is it rising too, is it going into an alarm condition or is it within the acceptable operating parameters? Is the oil grade correct for your ambient temps.

Had a tractor transmission pressure switch that was fine cold then annuciated when warm. Pressure gauge fitted when warm and pressures although lower than new within acceptable limits. Replaced switch and all thoughts of pump changes/clutch pack changes out the window as its fine now.

 

[David Bliss]

Electronic censers can waist lots of time and worse more often than not give warning theres a problem, however any thing worked to there limit needs cooling, so how clean internally is the rad not just the outside, when was the coolant changed, and just a simple thermostat getting lazy, old types used to fail open new fail shut, new and old in saucepan of boiling water as its first to open and how far. even these things being checked need to be done thoroughly are not a quick fix like flushing a rad but more importantly getting rid of any cleaner left thats absolutely nessarsery or its going to cause more issues.

 

[MrNoo]

Just this afternoon I fired mine up as wanted to steam clean it off. I flicked to the page where the volts/temps/pressures were and at cold mine was reading 5.2 bar, so if yours is only 3.5 bar that's only 50psi in old money at cold. Mines a CX6080

 

[davidroberts30]

first thing first fit a good manual gauge on and see what is actually happening!!
air/diesel filters clean?
correct grade oil for the engine?