Amazone Zam ultra/amatron+ spread rate inaccurate

[Garchie08]

Hi guys. Had to replace the ecu/controller (on the spreader itself, not the amatron+) on our 2008 Zam ultra profis after the controller shorted and burn itself.
With the new controller on the spreader doesn’t spread accurately any more, it can be 10% to 30% lighter then the set rate, never had an issue with the original controller.
I always use amazone my spreader app to get the calibration factor and the vane settings.
The speed is reading accurately so it’s not that the spreader thinks the tractor is going slow.
Any ideas on what could be wrong or what settings I would need to change?
Thanks
Graeme

 

[s~~t shoveller]

Have you set the impulses per 100m correctly or are you using gps to establish distance travelled

 

[Garchie08]

Yes the impulses are correct and have double check against the tractor Speedo and a gps

 

[s~~t shoveller]

Is it possible it’s not connected…only thing that I’ve had in the past for under dosing was the bearings in the electric actuators …we replaced bearings with stainless steel ones as new actuators are £££ …so we were able to strip very carefully

 

[s~~t shoveller]

If you use the control box you can wind them in and out manually and listen to bearings see it they are noisy

 

[s~~t shoveller]

Stainless bearings came off e bay
Also fitted stainless agitator chain
Been great since -2004 machine with stainless front hood not the newer plastic type