How to make 6m 750a pull straight?

[Feldspar]

Having got it wrong last autumn quite a bit despite fiddling around, we have now worked out that we need to put a 8-9cm offset in to make our 750a bouts match up. Ideally I'd like not to have to do this. Have checked tyre pressures, link arms, but that hasn't solved the problem.

Any ideas of how to make the drill pull in line with the tractor?

 

[Timbo1080]

I've no idea, but would also like to know both why this happens, and how to amend. Gets a bit embarrassing when it's not your crop that is being drilled. On the plus side @Clive - Thanks for posting about your folding ram modification....Just had Smarts inform me that our kit is in the depot and ready to be fitted. Top service!

 

[Feldspar]

We also have some new prototype seed tubes to try out hopefully with strengthened tabs.

 

[Feldspar]

I've no idea, but would also like to know both why this happens, and how to amend. Gets a bit embarrassing when it's not your crop that is being drilled. On the plus side @Clive - Thanks for posting about your folding ram modification....Just had Smarts inform me that our kit is in the depot and ready to be fitted. Top service!

We were left with single tramlines every 12m. Couldn't even use every other one as an actual tramline because we'd spent ages matching everything up on the RTK and didn't want to shift. Offset is annoying because it means were trafficking an extra 16cm width on every drill bout.

 

[Timbo1080]

We were left with single tramlines every 12m. Couldn't even use every other one as an actual tramline because we'd spent ages matching everything up on the RTK and didn't want to shift. Offset is annoying because it means were trafficking an extra 16cm width on every drill bout.

Snap. Especially prominent in genuine zero til....not so profound in the shallow disced ground....must be down to there being a disc bias, but just can't see it visually on the drill. Could be one disc being not quite aligned to the correct angle...can't think of anything else. Very irritating. Currently waiting for some linseed to come up with the single tramlines...have told the customer that the agronomist uses a motorbike, and that they're for him.

 

[Feldspar]

Snap. Especially prominent in genuine zero til....not so profound in the shallow disced ground....must be down to there being a disc bias, but just can't see it visually on the drill. Could be one disc being not quite aligned to the correct angle...can't think of anything else. Very irritating. Currently waiting for some linseed to come up with the single tramlines...have told the customer that the agronomist uses a motorbike, and that they're for him.

I find they're quite good for easily spotting weeds.

 

[H.Jackson]

New seed tubes tried on last 75 acres tabs didn't snap even though bolts came lose, lock tight applied .

 

[H.Jackson]

 

[H.Jackson]

36 coulters buy 165 spacing makes drill 5.94m wide think mine is in gps at 5.95m with a 4cm offset matches all the time the steering is behaving!!!

For reference the discs in the pic have done 400 acres are blunt and 75% bevel gone.

 

[Clive]

as above the drill isn't 6m - ours on RTK is set at 5.95 and matches up perfectly - we run zero offset, it pulls straight

 

[Feldspar]

as above the drill isn't 6m - ours on RTK is set at 5.95 and matches up perfectly - we run zero offset, it pulls straight

I know the drill isn't a true 6m. I am prepared to have small extra gaps at the edge of each drill so that we can run on 6m to match up with rolls, sprayer, cultivator etc. What I would like though is for it to pull straight. Wonder why yours pulls straight? Do you run with your link arms tight or loose?

 

[Clive]

I know the drill isn't a true 6m. I am prepared to have small extra gaps at the edge of each drill so that we can run on 6m to match up with rolls, sprayer, cultivator etc. What I would like though is for it to pull straight. Wonder why yours pulls straight? Do you run with your link arms tight or loose?

link arms are tight I believe, will double check though

 

[Simon Chiles]

36 coulters buy 165 spacing makes drill 5.94m wide think mine is in gps at 5.95m with a 4cm offset matches all the time the steering is behaving!!!

For reference the discs in the pic have done 400 acres are blunt and 75% bevel gone.

Sorry to be pedantic but the row spacing should be 166 mm. That makes a 4 m drill 3.98m and by my calculations a 6 m 5.97m. All three of the 4 m drills I've had tracked perfectly at 3.98 with no offset.

 

[clbarclay]

Is the offset constant?

My unidrill pulls offset, but it varies, mostly with depth. Unlike the 750A though I put that down to the discs being arranged with right handed discs on the front row left handed discs on the back row, rather than left and right handed on the same row. I have two profiles setup for it. One for OSR and linseex, the other for cereals. One of the advantages of drilling in lands is if the offset is slightly out then depending on the lands pattern, I only get one gap every 42m.

When setting the GPS up I checked and adjusted the width first by drilling two adjacent passes in the same direction and then checked and set the offset by drilling two adjacent passes in opposite directions.

 

[Feldspar]

Is the offset constant?

My unidrill pulls offset, but it varies, mostly with depth. Unlike the 750A though I put that down to the discs being arranged with right handed discs on the front row left handed discs on the back row, rather than left and right handed on the same row. I have two profiles setup for it. One for OSR and linseex, the other for cereals. One of the advantages of drilling in lands is if the offset is slightly out then depending on the lands pattern, I only get one gap every 42m.

When setting the GPS up I checked and adjusted the width first by drilling two adjacent passes in the same direction and then checked and set the offset by drilling two adjacent passes in opposite directions.

I think the offset is pretty constant. It did seem to slightly reduce when we were drilling beans deeper. Overall our spring barley this year drilled into ploughed ground, shallow cultivated and direct into stubble all looks a lot better that the autumn stuff now I have put the offset in. Was just wondering if the link arms should be tight, whether I could skew the link arms off to one side a bit to compensate.

 

[cows sh#t me to tears]

as above the drill isn't 6m - ours on RTK is set at 5.95 and matches up perfectly - we run zero offset, it pulls straight

x2

 

[Tractor Boy]

I thought it was my tractor. My 4m drill was matching one way and not the other so I put a 4cm offset right into the tractor setup and now it matches fine. Must add I'm not RTK but RTX centrepoint.

 

[Feldspar]

I thought it was my tractor. My 4m drill was matching one way and not the other so I put a 4cm offset right into the tractor setup and now it matches fine. Must add I'm not RTK but RTX centrepoint.

Ours pulls off to the left (as you look at the drill from behind) rather than the right. Odd.

 

[cows sh#t me to tears]

Was just wondering if the link arms should be tight, whether I could skew the link arms off to one side a bit to compensate.

As tight as you can screw them up.

 

[cows sh#t me to tears]

One issue i have that most of you probably rarely encounter is crossing already drilled sections on an angle. the drill will wobble quite violently as it hits the furrows. Seems slowing right down is the only way of minimizing it.