Trimble GFX-750 - curvy lanes

andrags

New Member
Hello to all.

In last years I made a lot of changes in my farm and buying smart navigation was one of them.
Our local dealer has a promotion for spring so I bought a Trimble GFX-750 with EZ-Pilot Pro. The price was a bit overpriced for me but I said: "OK, let's do it".

Purchased it and after a few days, the support guy installed all stuff in a brand new tractor Steyr and on the next day we start planting a sunflower with also a brand new planter. The planter is 6 row with a width of 75 cm between each row. The navigation source is RangePoint RTX and as the dealer said: "for planting, there is no need using RTK", and I said "ok, you're the boss". We start planting but the results were far away from "straight AB". He did some calibrations, some settings, and the tractor started to move forward in an almost straight line. His advice was "if there are some movements from left to right and the line is like a snake, increase the aggressivity to 120, 130%".

We were happy, he left us and we continue with work. But the problems came when we move from one field to another. In some cases when the cabin of the tractor has a shake(swing) the GPS gave a deviation with 3-4 cm and the steering wheel was trying to compensate the deviating and the tractor makes a small "turn" and the result was a curved line.
The second thing was the distance between lines. In theory, there should not have a difference between the end of each row, but in practise, the results were in some moments about 90 cm instead of 75cm and he did this on random lines.

There were moments when for a short time everything is OK, but in some fields, the situation is so bad and looks ugly. My question is: 1) why the steering wheel non-stop makes turns from left-right-left-right such aggressively and the results is a bit curvy line, 2)is it possible this "wondering" where is the right way a have it root that the first calibration of the system was made on strong asphalt way instead of doing in the field where the tire grip is different to that of asphalt or the navigation source should have to be with bigger precision, 3) why tractor need a big space to find the center of the line? I make a few movements: forward, then back few meters then forward again and it is almost in the center...this thing bothers me and loses time...
 

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