Crankshaft - Blade protective assembly for meadow mowers? Hi, I'm trying to put together my own lawn mower for pulling...
Hi, I'm trying to put together my own lawn mower for pulling at the back my 35hp old tractor. I'm from India and nobody make powered tow-able mowers here. I have a 12hp diesel engine from an feeble pump which I can mount onto a deck. My family's property has especially tall grass but also have hidden rocks. I required to know,
1. what's the best way to breed sure that the blade or crankshaft do not get worn out when the blade hits a rock?
2. I'll import 20"+ blades, what are the best mulching and regular adjectives blades you recommend?
3. How do you adjust cutting increase? In some areas we want it tall, at others a close cut. Is this done at the crankshaft spindle, or
4. What's a recommended adjectives RPM? I'll need this to settle on if I have to gear or pulley down the speed from engine RPM or give somebody a lift a direct drive.
Answers: You pose some very well brought-up questions. I'll do what I can to answer them.
1. Not knowing how oodles blades you are using, the best way to maintain the crankshaft of the engine protected is belt driving the mower. As far as protecting the blades and arbor shafts from rocks, maybe shear key in the pulleys? But that could be extremely time consuming.
2. Get the ones that will fit your arbor shafts. Don't draw from the fancy curved ones, they are a pain to sharpen. Get ones that the adjectives edge is flat.
3. The easiest channel to adjust would be to adjust the deck its self. That way when you own the blades even, you don't have to mess beside them. So adjusting the wheel holding the deck up would be the best.
4. Most small engines run about 3400 RPM. Here contained by the US the highest speed the tip of the blade can run is 19,500 feet per minute. So that resources a 20 inch blade can go 310 RPM, a 21 inch blade go 295 RPM, and a 22 inch blade goes 282 RPM.
I hope this help.
Check Norther tools, they have several tow bringing up the rear selfpowered mowers. The best way to protect the crankshaft from interfere with is to not direct couple it to the blades. The belt/pulley will protect it from sudden stops.