Swapping DFR cogs on NH combines

[Feldspar]

So far we have left the DFR on our NH combine set on the fast setting for rape. I understand it works better on the slower setting. Is this case? If so, how long a job is it to swap over and is it a complicated job?

@Brisel, hoping you might know the answer to this.

 

[Brisel]

I’ve tried it in slow. No difference in osr. I’d consider it if I was getting unthreshed tips of barley in the sample I’d try it. Otherwise, leave it in high speed. Newer 10.90s can have them on a variator of their own I think.

Why slow it down? In osr most of the seed is out of the pods long before the DFR. Are you worried about overloading the sieves with broken straw? If you do slow it, be aware that you’ll be creating a slow point in the feed where a lump could block it. I’ve never blocked the DFR in 2 seasons but have blocked the rotors a few times when some osr leaked out of the grain tank onto the rotor variator belts making it slip under power.

It’s a 10 - 20 minute job to change over. 20 minutes the first time unless you try it in the yard first.

 

[Brisel]

I’ve only run a New Holland CR combine for 2 seasons so far. There will be far more experienced and talented operators than me out there!

 

[Colin]

Ours is just in high speed but we don't grow rape. Lot noisier than the o,d system but at least you don't have to turn the sensitivity that far down on gravelly soils that it doesn't sense the big ones! When cutting big crops of rye it can be bad for blocking but better there than the rotor.

 

[Feldspar]

I’ve tried it in slow. No difference in osr. I’d consider it if I was getting unthreshed tips of barley in the sample I’d try it. Otherwise, leave it in high speed. Newer 10.90s can have them on a variator of their own I think.

Why slow it down? In osr most of the seed is out of the pods long before the DFR. Are you worried about overloading the sieves with broken straw? If you do slow it, be aware that you’ll be creating a slow point in the feed where a lump could block it. I’ve never blocked the DFR in 2 seasons but have blocked the rotors a few times when some osr leaked out of the grain tank onto the rotor variator belts making it slip under power.

It’s a 10 - 20 minute job to change over. 20 minutes the first time unless you try it in the yard first.

I think I was told by a APH that the slower speed had more torque and was less likely to block.

 

[Brisel]

I think I was told by a APH that the slower speed had more torque and was less likely to block.

Hmm. The drive belts will transmit power better than they will torque.

 

[yellow belly]

in a case and on the tf if you want to reduce The sieve load you can put som blanking plates in the conclaves
could make some up for the cr if it is a big problem
first set the speed veins at fast
the usual problem with rape is not being able to go fast enough to keep it full so then shutting the sieves down and reducing the wind to reduce loses blown out the back

 

[Feldspar]

Ours is just in high speed but we don't grow rape. Lot noisier than the o,d system but at least you don't have to turn the sensitivity that far down on gravelly soils that it doesn't sense the big ones! When cutting big crops of rye it can be bad for blocking but better there than the rotor.

I suppose this is a good point. Better the DFR than the rotors.

 

[Sandy]

What benefit does the dfr have over the previous models without?

 

[Colin]

What benefit does the dfr have over the previous models without?

The stone trap used to be a door on the bottom of the straw elevator that dropped open and ejected the stone when it hit a knock sensor at the front of the elevator. It would,d stop the feed then you reversed the header and lifted the header up to reset the door, hopefully. I thought it would be great, and it would if you weren't cutting flat stuff in gravelly soils, you can imagine what happened. You ended up making the system so insensitive it didn't open at all. Dfr works just like a normal stone trap except the drum isn't technically part of the threshing system. It turned the cr into a much noisier combine.

 

[Sandy]

The stone trap used to be a door on the bottom of the straw elevator that dropped open and ejected the stone when it hit a knock sensor at the front of the elevator. It would,d stop the feed then you reversed the header and lifted the header up to reset the door, hopefully. I thought it would be great, and it would if you weren't cutting flat stuff in gravelly soils, you can imagine what happened. You ended up making the system so insensitive it didn't open at all. Dfr works just like a normal stone trap except the drum isn't technically part of the threshing system. It turned the cr into a much noisier combine.

Any difference to output?

 

[Colin]

We,, you don't have to stop and reset it all the time, so there's that. Meant to provide a boost but there are more moving parts as well, the belt that drives it is the one that measures load for the cruise control system. Mostly a good combine though but header pressure control is garbage jf you are cutting low, which we do. A good update would be a macdon I think. The height sensors are at the back of the header so if the knife is pushed out for taller crops they are maybe 5 feet from the knife. Prefer the claas pressure control system as well, the NH only lets you have one height that uses pressure and have to take your hand off the stick to swap between heights. Compared to the claas (at least the last time I drove one) you had two height and two pressure settings just by using memory on the joystick. The nh is going to be here for a few more years it's a 2014 but should have bought a claas.?

 

[Feldspar]

What benefit does the dfr have over the previous models without?

I was told it smooths flow in damper conditions which improves output.