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Garden Tractors Discussion Forum

spindle speed?

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JL Ray

01-03-2018 09:41:24




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Does some one know right off what the spindle speed is on a mower deck with 20 inch long blades?




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JL Ray

01-04-2018 17:41:09




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
i think with all this info I can run the deck straight off the hyd motor I have. I just need to find the right pump now. I think I already have it, I just need to locate it. The rest is just labor.



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Doug - Iowa

01-04-2018 15:44:27




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
A 20" push mower runs direct off a 3600 RPM engine, so I'd plan for that.



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JL Ray

01-03-2018 19:06:11




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
jim: where are you located?



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Jim in rush co

01-03-2018 19:47:02




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 19:06:11  
40 miles southeast of Indy. I would like to see a few more of the ditch bank mowers and steal a few more ideas. MF dealer had one couple yrs. ago and has me thinking I could come up and make one. It had pto pump and a large oil tank on apposing side of the arm and deck



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JL Ray

01-03-2018 18:23:00




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
It may be a bit. This is a do it as I have time and find parts project. I have motors. Need to find a pump which I think I have. Just need to look. I have the deck. Have meterals for the frame work. Have the lift cylinder. Have the valves. And not in a hurry.



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JL Ray

01-03-2018 16:26:07




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
I have a pair of Super 55 olivers. I'm going to mount an arm to the side of one which has a loader frame on it. Approx 10 to 8 feet out from the tire. On it I'm wanting to mount a 60 inch JD deck. I plan on making the deck movable so I can have to horizontal or vertical. So I can mowe pond and stream banks or trail sides to keep them open and brush off my truck.
Basically make a mower like the county hires to do roadsides but mines on the cheap.

54 acres mostly wooded. Two ponds and a stream going thru the property. My little heaven.

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Jim in rush co

01-03-2018 16:54:53




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 16:26:07  
I wandered if that's what you were doing. My Allis deck will be Ok for mowing the side ditch, I was going to mount off to side also but I have a lot of field edges with woods and sure would like to have something that would cut maybe 1-2" stuff and put on JD tractor but probably would need pto pump to get enough flow. I have email open when you get it done shoot me a picture.



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Jim in rush co

01-03-2018 15:29:20




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
JL, just curious what you might be working on? I have been thinking about mounting an Allis deck on front end loader and driving it with hydraulic motor. I have 1/4 mile of ditch along state highway and thinking of something I can mow it with from my side only, them people are nuts out there!



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Mule Meat

01-03-2018 12:21:23




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
Spindle speed can be determined using simple math.

First get the engines max operating speed - RPM.

Measure the drive (engine) pulley diameter.
Measure the driven (spindle) pulley diameter.

Now an example if the drive pulley is smaller than the driven pulley.

Engine speed = 3600 rpm.

Drive pulley = 6".

Driven pulley = 7"

7 divided by 6 = 1.16

1.16 divided by 3600 = 3103 rpm spindle speed when the engine is running at max rpm.

===========

Now if the drive pulley is larger than the driven pulley.

3600 rpm engine speed

8" drive pulley (engine)

4" driven pulley (spindle)

8 divided by 4 = 2 (2.0 -1)

Now you multiply the engine speed by the results.

3600 x 2 = 7200 rpm

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jl ray

01-03-2018 12:59:52




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 Re: spindle speed? in reply to Mule Meat, 01-03-2018 12:21:23  
I don't have all the pulleys in between. I have a mower deck and a hydraulic motor which turns 3000 RPM. I was wanting to know so I could make the connections to get the correct rpm.



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JL Ray

01-03-2018 12:15:44




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
Yes thank you. That is what i was looking for.



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Jim in rush co

01-03-2018 11:51:26




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 Re: spindle speed? in reply to JL Ray, 01-03-2018 09:41:24  
My Kubota 60" cut. Blade length 20.6" Blade tip speed 14,271. Spindle speed 2647 RPM. hope this helps, Jim



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