750A Metering system

[Ford6600]

Having bought a second hand JD750A late autumn 2021and replacing all wearing parts as required.The drill was used to drill grass seeds, stubble turnips and cereals . We have had great success with each in a challenging year
The problem with the drill is the accord metering unit which is land driven (no electrics)
Having been use to an Amazone Air Drill which is accurate from drilling 400grams of swede seeds per acre to beans at 100 kg .
It doesn’t keep to the calibrated rate in fact it’s appalling.
Any ideas much appreciated

 

[Timbo1080]

Check that the land wheel is being stopped when out of work - There should be a nylon type flap that rubs against the land wheel to stop it revolving when you pull out of work. If that's worn or missing, then you will consistently over-apply as the wheel will keep metering while out of work. Otherwise @Simon Chiles .......

 

[Simon Chiles]

Having bought a second hand JD750A late autumn 2021and replacing all wearing parts as required.The drill was used to drill grass seeds, stubble turnips and cereals . We have had great success with each in a challenging year
The problem with the drill is the accord metering unit which is land driven (no electrics)
Having been use to an Amazone Air Drill which is accurate from drilling 400grams of swede seeds per acre to beans at 100 kg .
It doesn’t keep to the calibrated rate in fact it’s appalling.
Any ideas much appreciated

There’s definitely something wrong with it if it isn’t seeding accurately. Whilst the Accord metering unit is difficult to access on a 750 you can’t normally knock it for accuracy. I could drill 100 acres of linseed with one and have less than a Kg of seed left over. It would be as accurate for all other seed type’s except possibly grass.
As @Timbo1080 says check the rubber brake on the metering wheel when it’s raised. Tell tale signs that it’s worn or missing are seeds on the surface when you turn. At normal 750 drilling speeds there is quite a bit of inertia in the metering wheel which necessitates the need for the rubber strip that brakes the wheel.
Have you checked the cell wheel of the metering unit for wear/rodent damage. Does any seed escape around the cell wheel itself, it’s worth checking it out when you wind the cell wheel by hand to calibrate it. It’s probably worth changing the black rubber flap that hold the seed in the cell wheel, ones that are old but look ok can still affect the accuracy and they’re only £20 or so.
With a mechanical Accord unit you can always achieve better accuracy for lower seed rates by doubling the cell wheel setting and halving the cell wheel speed by pulling out the red cog to use the reduction gearing. For example if the recommended cell width is setting 40 I’d set it at 80 and halve the speed. Obviously you can only do it for recommended settings of 55 or less.
As it’s second hand you could check that someone hasn’t removed the agitator pins to sow beans, although on most seeds they don’t normally make a difference.
The Accord unit can cope with all seed types, I’ve planted over 23 different seed types with one, at rates between 2 and 400 kg/ha.

 

[AdamHoggard]

You could always keep the accord metering unit and swap the land wheel out for a electric motor kit allowing you to monitor the seed rate with ease or even use variable seed rates.

Agri-mate.co.uk can supply you with a retrofit variable rate isobus kit for your drill.

 

[Flatwheels]

We suffered from poor metering on a 6m land wheel drive. Put spring kit on the wheel added weight to the wheel because it was bouncing up in work and very slow to fall back to the ground. Lubricated the telescopic shaft from the 90 degree gearbox and the wheel just fell to the ground. Wear between the 2 halves of the shaft meant it was gripping itself when shorten and not letting the wheel down. Walk behind the drill and you may see what we experienced.

 

[L P]

Rats love the metering flutes and rubber flap by them, flutes are a pig to change, flap very easy. Normally over seeds if it's that. Calibrates ok but seeds at a higher rate. They do take fine tuning. I tend to drill out a bag and alter it to run right if seed rate is wrong to ha meter. Then you're only ever out by 10% of a bag, not the whole crop sown. No more than 5 bags of grass to a fill up, always compacts down and runs slow if you put too much in.

 

[Will Blackburn]

No more than 5 bags of grass to a fill up, always compacts down and runs slow if you put too much in.

Only ever had an issue with grass once when I didn’t put the roll pins back after drilling beans. I’ve filled to the top and crack on with great results, I’m sure the sieves keep some of the seed weight off the base.

 

[L P]

Only ever had an issue with grass once when I didn’t put the roll pins back after drilling beans. I’ve filled to the top and crack on with great results, I’m sure the sieves keep some of the seed weight off the base.

Lucky you, I have never had such luck with grass seed with any drill I've owned, the grass grows great, but to be half a bag out over 100 acres takes some doing

 

[Bob lincs]

Rats love the metering flutes and rubber flap by them, flutes are a pig to change, flap very easy. Normally over seeds if it's that. Calibrates ok but seeds at a higher rate. They do take fine tuning. I tend to drill out a bag and alter it to run right if seed rate is wrong to ha meter. Then you're only ever out by 10% of a bag, not the whole crop sown. No more than 5 bags of grass to a fill up, always compacts down and runs slow if you put too much in.

We have had several flaps eaten by rats over the years , I don’t know why but they seem to love them . If our drills are parked up now we spray the metering units with a aerosol rat poison and now have no problems.

 

[Clive]

always found our 750a's extremely accurate re seed rate

something must be wrong or worn ?

 

[Wombat]

We have had several flaps eaten by rats over the years , I don’t know why but they seem to love them . If our drills are parked up now we spray the metering units with an aerosol rat poison and now have no problems.

I parked my drill with accord metering twice in autumn due to weather, both times empty and both times the little feckers ate through the rubber flap.

 

[Bob lincs]

I parked my drill with accord metering twice in autumn due to weather, both times empty and both times the little feckers ate through the rubber flap.

 

[Ford6600]

always found our 750a's extremely accurate re seed rate

something must be wrong or worn ?

Thanks for reply Has your drill got electric driven metering or land wheel

 

[Clive]

Thanks for reply Has your drill got electric driven metering or land wheel

We don't run a 750a any more

but the 4m we had was land wheel and the 6m electronic - both were equally accurate

 

[Simon Chiles]

We don't run a 750a any more

but the 4m we had was land wheel and the 6m electronic - both were equally accurate

It seems a long time ago now but your 4m was also electric metering, it was the first 750 JD made Greenstar compatible, I had it a good 6 months before they could email me the operator’s manual and it was probably another 6 months before I got the hard copy. It had an LH Agro job computer as opposed to the KV ones they now have.