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Friday evening question, Throttle position when,,,,,


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#1 propane1 ONLINE  

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Posted May 22, 2015 - 03:44 PM

cutting your grass ?  What do you set yours at ?  Full, 3/4 or 1/2 ? Your thoughts as to why you set it where you do when you cut your grass. On some of my tractors, I set mine down that I use, depending on grass conditions, wet, long, or not something normally cut.  I find it saves fuel, less noise, cuts the same and I like the sound of the engine at lower rpms.  I don't find that they over heat, and they still charge the battery. Just wondering what you all think.  Noel


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#2 dthomp17 OFFLINE  

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Posted May 22, 2015 - 04:02 PM

I have two cubs (a 1450, and 1650) that I run at full throttle.  I think it's important for proper cooling on the "K" series kohler engines.  I also have a Sears SS/16 with a twin 18hp Honda that I usually run at 1/2 to 3/4 throttle and it does a good job.  If you can get a copy of the owners manual that would be your best guide. 


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#3 boyscout862 ONLINE  

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Posted May 22, 2015 - 04:48 PM

I try to not run anything above 3/4 throttle. The stress on the components is an exponential function(I'm an engineer). That means that 3/4 throttle is 1/2 the stress and wear on the engine compared to full throttle. I like to baby my tools, equipment and engines inorder to get the maximum life and work out of it. I've seen a number of cases where full throttle leads to dramatic failures where a lower throttle would have gotten noisy before the explosion. Its all a matter of taste. The tortise vs the hare. Good Luck, Rick


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#4 Freddie1911 OFFLINE  

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Posted May 22, 2015 - 06:13 PM

If I'm cutting grass it's balls to the wall. Blade speed & lift. Besides I got other things that I really need to do.
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#5 KC9KAS OFFLINE  

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Posted May 22, 2015 - 06:46 PM

There was a thread about this some time ago...A hydro needs to be run at just about wide open throttle for the hydro to work and cool properly.


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#6 chieffan ONLINE  

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Posted May 22, 2015 - 06:49 PM

Tilling I run at 3/4 or a little above. Mowing with the hydro is full +. Cultivating it is about 1/4 to 1/2 as there is really no load on the motor other than pulling the tractor and the cultivator in some dirt about 2" deep.
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#7 Bolens 1000 ONLINE  

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Posted May 22, 2015 - 06:55 PM

Most engines will run cooler and have less strain on them at full throttle and have less wear especially while under a load.

 

We talk about this all the time between dealers and many customers thought they were saving the engine mowing at 1/2 throttle while they were actually slowly killing the engines.......

 

my 0.02


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#8 propane1 ONLINE  

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Posted May 22, 2015 - 07:56 PM

One of these tractors I do have, that I don't run on full throttle, is a 1993 yard king, Murray, tractor that I bought new. It's a vertcail shaft 12 hp and 38" deck. Still runs good and started up great this spring after sitting all winter, and I am not sure if I had it going last year. Been a great tractor. Also used it for pushing snow years ago. Noel.

#9 dodge trucker ONLINE  

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Posted May 22, 2015 - 08:43 PM

wide open for blade  speed considerations,  control ground speed with transmission (whether gear or hydro)

It's actually easier on the equipment, lugging at less than full throttle is actually harder on everything.

 

If I am pulling a cart around or something besides mowing then I may throttle it down a bit.

I definitely run at idle when loading/unloading mower from my truck bed or trailer.


Edited by dodge trucker, May 22, 2015 - 08:46 PM.

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#10 motobreeder OFFLINE  

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Posted May 22, 2015 - 10:33 PM

Setup properly, full throttle should be about 3600 RPMs.  I've seen that referred to as "high idle".

 

As many have suggested, I almost always run at high idle.   That way the mower blades spin fast enough to cut properly.


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#11 shorty ONLINE  

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Posted May 23, 2015 - 03:59 AM

When mowing I like to keep the blades spinning as fast as possible. Doing other things, it depends on how much power is needed. 


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