Gear reduction K91

[formariz 11,991]

Trying to sort out inventory here for some new projects. Does any one know offhand at what speed the shaft on a K91 with gear reduction turns?

[pfrederi 18,216]

Most gear reduction are 6 to 1  so 3600 rpm would be 600

[WHNJ701 4,165]

I can look tonight in my kohler books, but as said it's 6 to 1

[formariz 11,991]

That would be great for me. So using the throttle it will be adjustable down to about 33 rpms at 2000. I may give it a try for my large grindstone. Just need to get it started.

Edited December 10, 2020 by formariz

[WHNJ701 4,165]

[71_Bronco 1,072]

What if you were to put a gear-reduction K91 into a Wheel Horse? With a 6:1 gear reduction, your ground speed would obviously suffer, almost like driving in low-range on an 8-speed I would imagine.

 

Would this in theory increase your "pulling power"? I know that is more dependent on traction as well. Or would this just be a way to make a ridiculously slow tractor? 

[formariz 11,991]

@jabelman.  What kind of oil does manual specify for gear box? Same as engine?

I had this engine for at least 16 years. Never started it. Came with other things. Cleaned it up put in a carburetor and recoil which didn’t have, fired up on first two pulls. Got to love Kohlers.

[formariz 11,991]

52 minutes ago, 71_Bronco said:

What if you were to put a gear-reduction K91 into a Wheel Horse? With a 6:1 gear reduction, your ground speed would obviously suffer, almost like driving in low-range on an 8-speed I would imagine.

 

Would this in theory increase your "pulling power"? I know that is more dependent on traction as well. Or would this just be a way to make a ridiculously slow tractor? 

Probably will prove to be unusable on a tractor. I am not sure what they usually were used on and I thought I would never use it, but now I find it perfect for this application since it will not only turn it real slow but makes the RPMs adjustable by using throttle.

Glad I kept it.

[DennisThornton 4,770]

Overkill for a grindstone!

[formariz 11,991]

15 minutes ago, DennisThornton said:

Overkill for a grindstone!

For sure but why not? Got to use some of the stock here. It’s also going to have an electric option for indoor use.

[DennisThornton 4,770]

Not sure what I'd use it for...

[WHNJ701 4,165]

45 minutes ago, DennisThornton said:

Not sure what I'd use it for...

I used to sell alot gear reduction parts that I came across,  mostly briggs stuff to people that restored old walk behinds

[WHNJ701 4,165]

9 hours ago, formariz said:

@jabelman.  What kind of oil does manual specify for gear box? Same as engine?

I had this engine for at least 16 years. Never started it. Came with other things. Cleaned it up put in a carburetor and recoil which didn’t have, fired up on first two pulls. Got to love Kohlers.

 

[R Scheer 503]

On 12/10/2020 at 1:19 PM, formariz said:

That would be great for me. So using the throttle it will be adjustable down to about 33 rpms at 2000. I may give it a try for my large grindstone. Just need to get it started.

Wouldn't that be 333 rpm?  2000/6

[formariz 11,991]

35 minutes ago, R Scheer said:

Wouldn't that be 333 rpm?  2000/6

Oops yes. It gets reduced further by large pulley on wheel. Trying for a maximum of about 60RPMs . I have two  one at 10” and one at 17”. 
Should be able to achieve that with the 10” pulley and a 3” pulley on engine with it just idling at 1200 therefore turning engine pulley at 200.

Edited December 11, 2020 by formariz

[oliver2-44 10,115]

1 hour ago, formariz said:

 with it just idling at 1200 therefore turning engine pulley at 200.

Since the K91 is a splash lube system would it be better to have the engine running at higher than idle. Some on here have recommended Kohler be fun at 3/4 rpm or higher for extended runs 

What say you RedSquare Kohler Guru’s

[formariz 11,991]

2 minutes ago, oliver2-44 said:

Since the K91 is a splash lube system would it be better to have the engine running at higher than idle. Some on here have recommended Kohler be fun at 3/4 rpm or higher for extended runs 

What say you RedSquare Kohler Guru’s

I can switch to he 17” pulley on stone to have engine rev a little higher and also go to a smaller one on engine. However this set up will only run once in a blue moon probably not long enough to do damage. I understand and agree the dangers to the engine from running at low RPM for extended periods but in reality here there are so many other engines that I may never have the opportunity to use in my lifetime that the demise of one would be inconsequential.

[953 nut 56,876]

23 hours ago, formariz said:

not sure what they usually were used on

We had a Diaphragm Trash Pump to move water from the pond on the farm that had a gear reduction engine.

[Vurge 158]

On 12/12/2020 at 4:33 AM, 953 nut said:

We had a Diaphragm Trash Pump to move water from the pond on the farm that had a gear reduction engine.

I've got an old Briggs gear reduction off a chemical sprayer pump. I've always suspected that the 6:1 reduction is to match a standard tractor PTO that runs at about 540 rpm.  

[Handy Don 13,131]

17 hours ago, Vurge said:

I've got an old Briggs gear reduction off a chemical sprayer pump. I've always suspected that the 6:1 reduction is to match a standard tractor PTO that runs at about 540 rpm.  

Sounds plausible to me. These useful ratios are rarely coincidental--engine company engineers were always thinking about how to get companies to use their products. My brother-in-law has an orchard sprayer on a hand cart with a gear-reduced 1.5hp Briggs. Gotta say it is a very cute little motor and it sure does the job for his dozen or so trees.