MF 6499 running strangely

[Tommy]

Got something playing about with an ‘04 dynashift. After a few hrs of work it will start to drop revs off, not many say 50-100 and in the blink of an eye they are back. It’s as if you’re giving the throttle pedal a slight blip but she’s loosing revs rather than increasing. While it’s doing this the fuel/hr meter freezes and the A/B preset revs won’t work, she also won’t rev past 1800 rpm. Sometimes stopping and restarting has cured it, sometimes it will come back on it’s own. There are days it won’t do it at all??? Anyone come across this before? Is it a problem with the dreaded Bosch pump?
Thanks
Tommy

 

[Cowabunga]

Possibly the spill valve inside the pump going out of parameters. Happened on my 7490. Firstly it would lose revs for a while, intermittently, then eventually it would lose almost all power. Those Bosch pumps almost all fail around 5000 to 6000 hours. It will need to be removed from the tractor and sent away to be overhauled. Mine was done and it has been fine for the last few years. When Shorts [the South Wales authorised repairers] tested it, they could only find a slight loss of pressure at this valve, but not enough to warrant changing it they said. But since they had it in and I was paying, they changed it anyway and, lo and behold, it actually was enough to cripple the engine and they actually cured it 100%
There were fault codes on mine though. Can't remember what it was but something like a can-bus failure, which was a false code as there was nothing whatsoever wrong with the wiring.

 

[daveydiesel1]

Have u tried recalibratin the throttle pedal? Sometimes it can mess about a bit

 

[Tommy]

There are no error codes yet, but it seems to be happening more frequently so they could be next. It’s just turned 6000 hrs [emoji849] so it’s in the window for trouble by the sounds of it.
If the throttle was out of calibration would it not be messing about from cold? It won’t harm to do it anyway. I’ll see how it goes today on the Buckrake, there should be a gap in the silaging then to get it looked at.
Thanks again
Tommy

 

[jamc]

There are no error codes yet, but it seems to be happening more frequently so they could be next. It’s just turned 6000 hrs [emoji849] so it’s in the window for trouble by the sounds of it.
If the throttle was out of calibration would it not be messing about from cold? It won’t harm to do it anyway. I’ll see how it goes today on the Buckrake, there should be a gap in the silaging then to get it looked at.
Thanks again
Tommy

check banjo bolt feeding filters for dirt

 

[Tommy]

With this wet weather I’ve had some time to get this looked at again. Took the banjo fitting of and found a load of crap in there.i hope that’s the cure but I won’t know until I’ve done a bit more work with it.

Fingers crossed
Thanks all
Tommy

 

[Nearly]

@masseybreaker

 

[daveydiesel1]

With this wet weather I’ve had some time to get this looked at again. Took the banjo fitting of and found a load of crap in there.i hope that’s the cure but I won’t know until I’ve done a bit more work with it.View attachment 886366
Fingers crossed
Thanks all
Tommy

We had problems with ours when it was a year old and it was plastic fillings stuck ther. Dont know how they got in ther but

 

[rob h]

We had problems with our 6150 this spring tried all sorts.in the end we found what looked like a sweet rapper sucked up the fuel pipe in the tank

 

[Tommy]

Well it’s still no better[emoji17]. Banjo fitting has been clean every time it’s messed about and there seems to be no restrictions back to tank as it will syphon out if you hold the pipe down lower than the diesel level. It’s strange there’s no error codes. Going to throw some diesel additive in and see if things alter

 

[ih1455xl]

Have you tried a new lift pump my 7490 had been doing funny things to fitted new lift pump and seems to be fine but have sent the ecu off for testing before harvest to make sure there’s no problems there

 

[ih1455xl]

and check all your power and earth points aswell

 

[ih1455xl]