Berta flail mower

NibbanaFarm

Silver Member
Joined
Oct 25, 2014
Messages
128
Location
New England
Tractor
BCS 739, Cub Cadet 2544
Hi ;)

I have had my Berta flail mower for some 1 1/2 year now, and I have used it for almost 50 hours.

Like other members, I have experienced that the flail mower tends to rise when mowing uphill. This is physics, and it is what we might expect with all front-PTO implements. For me it begins to be critical when approaching around 20 degrees of slope, and then I only mow downhill, and walk idle uphill. With a light implement like a sickle bar mower, I mow across the slope up until around 20-30 degrees, and then again only downhill. I haven’t been able to successfully mow across a slope with heavier mowers, like the Berta flail or my Zanon lawnmower. Gravity is simply stronger than this old man :cry:

One task where the flail mower has proven very efficient, is getting rid of up to 2 m (6 1/2’) tall eagle fern, which tend to invade some of our meadows:

View attachment 721165 View attachment 721168 View attachment 721170

I mow with the cutting hight set at its maximum of 5 cm (2’’), and then I mow in first gear taking half cuts. This way the Honda engine stays on top of things, and the cut material gets a second treatment.

As mentioned in some of my earlier posts in this thread, I also use my Berta as a sort of scarifier/de-thatcher, to remove moss and old/dead plant material. This foto is from a lawn, where the moss had taken control:

View attachment 721171

This one is from my meadow, where after the grass had been mowed and removed, I used the Berta to prepare the plot for seeding wild flowers for the insects:

View attachment 721172


Best regards

Jens
It looks like you're running duals there Jens. I'd like to fit duals on my 739 because I have a little trouble running my disk harrow in the spring when the soil is muddy. I usually put manure down and plow it under as soon as I can in the spring. Then I have to disk it down to a relatively flat surface before I can plant anything. But the soil is still wet and the tractor tends to get stuck in the plowed soil.

I don't want to buy the BCS wheel spacers because I'm not sure if they'll work for the wheel spacing I have set on my tractor and they're pretty expensive. So I want to make some. How far apart are the tires on your dual setup? At the closest point?

Thanks. Nibana
 

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Jens767

Jens767

Silver Member
Joined
Apr 14, 2012
Messages
115
Location
Germany
Tractor
BCS 740
Hi ppea ;)

Thank you very much for your fotos of your Grillo and Berta in action - also the ones from last summer! It seems like you have quite a lot of mowing to do, and that you put your Berta to good use. I have the impression that you, like the rest of us, are impressed by the performance of the mower, and I also hope that you are happy that you got the bigger 85 cm model?

Looking closely on your fotos, I get the impression that you have done all the right things to your Grillo to get the most traction and the best stability possible: you have extended the wheel spacing to just within the working width of the Berta, you have added wheel weights, and finally I have the impression, that you might have larger than standard wheels on your Grillo - perhaps 23’’? Perfect (y)

In an earlier post in this thread you mention that you are concerned whether wheel weights might affect engine power. Basically, the engine „vaste“ power to move every kg/pound of weight from the tractor and the implement around, power that could otherwise be used to drive the implement. Therefore one should not „over ballast“ any tractor, especially when working with power-hungry implements. On the other hand, most modern 2-wheel tractors are very light compared with the ones made some 60 or so years ago, and they therefore often struggle to transmit the engine power into useful traction. A clear indicator of to little weight on the wheels, are that the wheels loses grip and start spinning. Here wheel weights usually are an easy cure, and for tractors having small wheels, swap them for larger ones, as they have a longer contact patch. Wheel weights have the added advantage, that they don’t change the balance of the tractor, and also don’t put extra stress on the axles, compared to weights mounted to the tractor direct. Your Grillo G110 weighs only around 110 kg I guess with the Honda GX 390 engine, whereas many older 2-wheel tractor from the 1950s with a similar engine power, easily had a weight of 400 kg or more available for traction. Except when using the most power hungry implements, most modern 2-wheels tractors will run out of traction before they run out of engine power.

Based on my experience combined with your fotos, I would expect you to mow in 1st gear most of the time in order not to stall the engine. When working with the Berta, you probably run your engine at full throttle - or close to full throttle, in order to get peak engine power. In 1st gear the mower will do a much nicer job, and the lower speed also gives you more time to avoid large stones, concrete or other obstacles that might be hidden in the vegetation. I have only been able to mow in 2nd gear a few times, when mowing short grass for instance.

I’m impressed by the way you have managed to put 2 tires on each rim. - Not bad! (y)


Best regards

Jens
 

ppea

Member
Joined
Dec 9, 2019
Messages
39
Tractor
1056xl,grillo g 110
In the first photo for example i mow with 2 gear with no problem,in the second photo with 1st gear.(5.00- r12 wheels).In the last photos you can se the benefits of the weight and the adjustable wheel extensions.I smoke the clutch several times,but still work fine.The wheel weight with extension is aprox 22-23 kg per wheel.Engine i run close to full throttle most of the time.

 

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lnk

Gold Member
Joined
Feb 24, 2014
Messages
255
Location
E TN
Tractor
Ferguson to-20, Deutz D7007, Yazoo yhr-60, Gravely 5240, Gravely C8 and model L,
In the first photo for example i mow with 2 gear with no problem,in the second photo with 1st gear.(5.00- r12 wheels).In the last photos you can se the benefits of the weight and the adjustable wheel extensions.I smoke the clutch several times,but still work fine.The wheel weight with extension is aprox 22-23 kg per wheel.Engine i run close to full throttle most of the time.

That is a lot of area to mow with a two wheeled tractor. Kudos to you. How many acres do you mow? Just curious. Nice looking fields.
 

ppea

Member
Joined
Dec 9, 2019
Messages
39
Tractor
1056xl,grillo g 110
I mow in 2 summer with bertha,aprox 5 acres per year ,and some areas 2 times or 3 per year.This year i bought a mower for 4 wheel tractor,and with bertha i mow only in small places or in places that can't go with the tractor.
 
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