Kuhn Axis 40.2 dosing error

[TBradbury]

The Kuhn axis 40.2 ecm i am using is recording less product than actually used, even with quality products such as nitram, more has been applied by the spreader than is recorded on weigh counter, any ideas what is wrong with it? The picture attached was 2400kg spread but has been recorded as 2260 so over applied,

 

[whiddy]

Have you checked your speed, does the speed on the box read the same as the tractor, or gps.

 

[Flat 10]

Have you tared it? And checked that 600kg reads 600kg on the spreader?

 

[freelancer]

The trip counter is always a little bit rough. Dont think too much about that...

 

[TBradbury]

Yeah the speed is fine, and the starting weight when it’s loaded is the same as what the bags weigh, thanks for the replies,

 

[PSQ]

Sounds too much of an error to be wheel slip.
Is it reading speed from a wheel sensor, radar or GPS?

 

[TBradbury]

If it was a speed issue that would mean the coverage would differ from the greenstar? Which it seems to pretty much concur with,

 

[PSQ]

Do you calibrate with the agitator running? (Yes, H&S would have a nightmare).

I find on a 30.1 that the calibration isn't accurate without the agitator running, and thats with the calibration checked at the end of every field on a full size weigh bridge.
I've also deleted the wheel speed sensor by wiring a GPS feed direct to Muller control box, as Dave Brailsford would say "the accumulation of small gains".

 

[TBradbury]

Honestly I haven’t actually calibrated, I thought since it was torque related it would do it itself somewhat,
But I’ll go and have a look and get cracking with the calibration, thanks for the help and advice everyone has given much appreciated,

 

[rs1]

It should calibrate its self.
mine does this, however it usually works out that hectares tally up with the amount of actual product used, just the weight it think it’s used is slightly out. It is only a theoretical weight.

 

[marco]

It should calibrate its self.
mine does this, however it usually works out that hectares tally up with the amount of actual product used, just the weight it think it’s used is slightly out. It is only a theoretical weight.

As said here how does it work out in the real world? Kg used and ha covered?

 

[No wot]

Your trip counter is your friend set to zero , number of bags (600 kg) in hopper ÷ kg rate / ha = how many ha that hopper full will do as long as you run hopper nearly empty each time and reset trip counter you can get a good idea how much is going on also make a note of the FF for each type of fertiliser and enter that figure in for the different types

 

[EddieB]

I find that ours is often out on the screen but is bang on in what it’s put on.

 

[neilo]

Have you tared it? And checked that 600kg reads 600kg on the spreader?

Does a 600kg bag of fertiliser ever weigh 600kg?

 

[Cowabunga]

Does a 600kg bag of fertiliser ever weigh 600kg?

They usually weigh up to 5kgs less. Their filling machines are extremely precise these days and they never overfill and are nearly always a few kgs short but within legal limits.

As far as the OP question, is the tractor driven at the exact bout width input to the spreader's control box? Is it shut off soon enough and opened late enough on the headlands?

I've no idea how those Kuhn spreaders weigh and adjust their spreading rate but if I were to guess you probably have to input an initial calibration figure to match the density of the product being spread? If so, have you actually checked that the weight of, say, 10 litres of product matches the specification in your calibration book or app?
I would assume that since they measure the torque on the disc shaft, that the density of the product being spread is an essential figure to give to the control box, otherwise there would be no precise link between the torque and mass being spread.

 

[neilo]

They usually weigh up to 5kgs less. Their filling machines are extremely precise these days and they never overfill and are nearly always a few kgs short but within legal limits.

Bugger. The weigh cells must be faulty on mine then, as I’m not sure I’ve put any bags in that have been up to 595kg.

 

[Cowabunga]

Bugger. The weigh cells must be faulty on mine then, as I’m not sure I’ve put any bags in that have been up to 595kg.

I almost always put two, three or four bags in at a time. Mostly four. They usually work out at no less than 2385kgs and very occasionally spot on 2400. Never ever more than 2400kgs though.

 

[TBradbury]

It should calibrate its self.
mine does this, however it usually works out that hectares tally up with the amount of actual product used, just the weight it think it’s used is slightly out. It is only a theoretical weight.

Sorry I had forgotten about my post, yeah I see what you mean, reading the manual unlike the older one where you did a flow test the weight scales should do it,
In the end I couldn’t really do much, some fertilizer as in MOP was bang on, the Nitram I was spreading was way off,
Thanks

 

[TBradbury]

I find that ours is often out on the screen but is bang on in what it’s put on.

They usually weigh up to 5kgs less. Their filling machines are extremely precise these days and they never overfill and are nearly always a few kgs short but within legal limits.

As far as the OP question, is the tractor driven at the exact bout width input to the spreader's control box? Is it shut off soon enough and opened late enough on the headlands?

I've no idea how those Kuhn spreaders weigh and adjust their spreading rate but if I were to guess you probably have to input an initial calibration figure to match the density of the product being spread? If so, have you actually checked that the weight of, say, 10 litres of product matches the specification in your calibration book or app?
I would assume that since they measure the torque on the disc shaft, that the density of the product being spread is an essential figure to give to the control box, otherwise there would be no precise link between the torque and mass being spread.

Yeah there there is the spread set app with the input data FF etc and there is as you say a calibration once all the data is inputted for the gps regarding throw and timing delays for the headland,
Honestly I haven’t checked the density, but spreading nitram again this week and I’ll give it a try,
Thanks for the reply,
The torque on the disc will be affected by the density and application rate/ rate of flow?

 

[TBradbury]

As said here how does it work out in the real world? Kg used and ha covered?

From the experience of using it, it’s somewhat hard to tell given the Greenstar and spreader roughly match up, but it would appear very accurate with 2-3% on the whole, however occasionally there are significant differences between the recorded weight and what you actually started with according to the weigh cells,