Dual wheels reducing traction?

[Will7]

Would having dual wheels on reduce traction? I have a JD 8430 dualled with 710 rears and 600 fronts pulling a ld subsoiler and we can’t get it to grip. It is tough going but we are sat at 20% wheel slip. The dual wheels give us more contact but spread the weight more. It currently weighs 16,600 kg, but that would drop to 15,000kg without the duals.

Many Thanks

Will

 

[Andrew]

With dual wheels you’re reducing ground pressure which will reduce traction as the lugs won’t be pushed in the ground as well.
Is it straight into stubble or has it been moved?

 

[jellybean]

Duals of the same rolling diameter would surely spread the weight over a bigger surface area therefore reducing traction, but I am no expert. I do have some steep ground though and have been worse off with duals on, the tractor will slide away much more easily than on singles. However if you look at the dual set ups they use in alpine situations you will see that the outer wheel is usually of a smaller diameter so they are in effect running on singles for traction but if the slope becomes so bad that the tractor is leaning over enough the outer wheel then makes ground contact to prevent the rollover without reducing traction by much at all. At least that is my interpretation of it.

 

[nick...]

Scratch the surface with tines or discs so there is something to bite into.i tried to pull out tramlines on rape stubble couple weeks back but so many volunteers I could not move.will disc when I get time and try again
Nick...

 

[Bobthebuilder]

if it's that hard dropping the duals off won't make any difference to compaction but it WILL help with traction

 

[Will7]

Scratch the surface with tines or discs so there is something to bite into.i tried to pull out tramlines on rape stubble couple weeks back but so many volunteers I could not move.will disc when I get time and try again
Nick...

The land has been moved to 50-70mm because it helps with traction, and it works better in that order

 

[Will7]

Thanks for the replies

 

[Barleymow]

I put duals on my Ford 7810 to pull cousins 3m discs , struggle to pull them without them on

 

[Matt L]

If you increase the surface area you decrease the ground pressure therefore the traction goes down. This applies to hard dry ground where the cleats are struggling to bite into the ground, if it was soft going and the cleats were fully biting into the ground then it would be the reverse and traction would be increased.

 

[Roy_H]

I put duals on my Ford 7810 to pull cousins 3m discs , struggle to pull them without them on

I can well believe that. We bought a set of Kverneland 6m folding rolls and on flat or slightly sloping land our 78 hp 2wd tractor pulled them easily but we had one particular field that had a steep slope and she used to scratch even though she was on 16.9-34 tyres. We got a set of duals for (Same size)her and oh what a difference!

 

[brentnz]

While singles might be the answer it would be worth experimenting with pressures while you’ve got the duals on. Make ‘em flex. Should be able to get really low with 710 duals.

 

[Will7]

They have 12psi (0.8 bar) all round. I am not sure I would want to run them much lower??

 

[HarryB97]

For primary cultivations you want a smaller footprint and more weight so you dig and bite into the stubble a bit but then dual it up for drilling or pressing etc. If they are a tyre designed for low pressure like Trelleborg 1060s or Michelin Ultraflex u'll be bale to get down to 8psi with trailed kit just have to be careful on the road at high sped.

 

[Skimmer]

Single or dual carrying the same weight at the same pressure will have a similar contact area.

 

[Farmernickt]

How much weight have you got on the front? You might have to much on the front which can reduce rear traction. Do you have wheel weights on the back end? They would also help if you haven’t.