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Harry Ferguson Tractors Discussion Forum

Re: Changing Gearbox Ratio on a Brush Hog/Slasher

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Brad V

01-09-2013 02:21:16

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I know that these tractors in top gear and at 1500 rpms are moving along at a frightening speed and a person brush hogging would almost certainly be killed, but the revs I am using are so low (I must connect my dwell meter to see my actual revs) that I am not moving any faster than my 15.5HP ride on mower flat out.

I don't think that my engine is turning more than perhaps 700rpm's and it does feel safe and it does a pretty good job. The engine runs great and does not miss abeat or heat up.

I must say that my slasher has been setup as per John(UK)'s instructions (angled with puncture proof rear wheel and sharp blades) and believe it or not it is safe.

If I felt that it was unsafe I would not risk my life.


This post was edited by Brad V at 02:22:45 01/09/13.

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01-09-2013 06:43:23

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 Re: Changing Gearbox Ratio on a Brush Hog/Slasher in reply to Brad V, 01-09-2013 02:21:16  
When using any PTO driven implement with a tractor, the PTO speed at which it is designed to operate is 545 PTO rpm which corresponds to 1500 (or 3/4 throttle) on your tractor. The Engine develops maximum torque between 1200 and 1700 engine rpm. You don't vary from that and it will operate just as it was intended to do. If you are having problems with excessive fuel consumption then you should check the settings of the Carburettor and make sure that the Air Cleaner is clean and clear and serviced daily (change the oil daily) If you do adjust the Carburettor never set the main jet less than 1 turn open in an attempt to make the tractor more economical or you will burn the exhaust valves. If you need the information about setting the carburettor, email me and I will send it you. There is more than one type of main jet used on these Carburettors, so the adjustments are not all the same.
Using 4th Gear is far too fast for any PTO mower work and should be discouraged. The problem will be if the crop you are cutting is of sparse growth. The mower will be set-up from the manufacturer with a gearbox ratio to handle most conditions. Below 1000 rpm the Engine Governor will not always operate properly. John(UK)fergusontractors@hotmail.com

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Brad V

01-09-2013 17:42:50

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 Re: Changing Gearbox Ratio on a Brush Hog/Slasher in reply to john(UK), 01-09-2013 06:43:23  
My tractor has been tuned to perfection as per your instructions quite some time ago and runs like a swiss clock.

The way I cut my paddocks at the low revs I use in 4th gear my fuel consumption believe it or not varies from 2.4 litres per hour for light work to 2.9 litres for heavy work.

I have one paddock approx 4 acres that at one stage using 3rd gear used to use 18 litres of fuel but now using 4th gear and low revs I can cut it in 1hr and 40 mins and use 4litres of fuel.

Hard to believe but true.

Next time I cut the grass I will fit the dwell meter on to see exactly what revs I am running at.

Regards Brad
This post was edited by Brad V at 17:45:10 01/09/13.

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