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shaft size adapter

#1

L

lscearce

I have a 3 5/32 shaft motor that I want to put in a lawn mower that had a 4 5/16 shaft motor.

Can this be done some how by modifying, converting or using some kind of adapter?

Thanks


#2

Carscw

Carscw

lscearce said:
I have a 3 5/32 shaft motor that I want to put in a lawn mower that had a 4 5/16 shaft motor. Can this be done some how by modifying, converting or using some kind of adapter? Thanks
Click to expand...

What mower are you putting it on?


#3

L

lscearce

This is a Craftsman ridding mower that had a Kohler 25 HP v-twin with a 4 5/16 shaft and I want to replace it with a Briggs and Stratton 24 HP v-twin with a 3 5/32 shaft.

Is there some kind of adapter for the shaft that will extent it to 4 5/16 shaft.


#4

Carscw

Carscw

lscearce said:
This is a Craftsman ridding mower that had a Kohler 25 HP v-twin with a 4 5/16 shaft and I want to replace it with a Briggs and Stratton 24 HP v-twin with a 3 5/32 shaft. Is there some kind of adapter for the shaft that will extent it to 4 5/16 shaft.
Click to expand...

In the same jam.
Only engines I can find all have the 3 5/32 shaft.


#5

KrashnKraka

KrashnKraka

lscearce said:
This is a Craftsman ridding mower that had a Kohler 25 HP v-twin with a 4 5/16 shaft and I want to replace it with a Briggs and Stratton 24 HP v-twin with a 3 5/32 shaft.

Is there some kind of adapter for the shaft that will extent it to 4 5/16 shaft.
Click to expand...

Which measure is mission critical..the drive pulley or clutch assembly?

KK


#6

L

lscearce

KrashnKraka said:
Which measure is mission critical..the drive pulley or clutch assembly?

KK
Click to expand...

It seam there are two shift sizes used the most the 3 5/32" and the 4 5/16". I want to use the drive puller and clutch from the original motor which is 4 5/16". Therefor I want to extend the shaft to the 4 5/16 length. That way the belts will be in the same alignment at the original belts on the pulley. Some kind of sleeve over the 3 5/32 shift that would extend the length and the diameter to measure to the 4 5/16 measurements. The sleeve would have to have a split in it for the shaft key.

Hopefully this makes sense


#7

G

gainestruk

I don't personally know of an adapter, you might find a local machine shop and tell them what you want to do and they might be able to come up with something to help you out.


#8

Carscw

Carscw

lscearce said:
It seam there are two shift sizes used the most the 3 5/32" and the 4 5/16". I want to use the drive puller and clutch from the original motor which is 4 5/16". Therefor I want to extend the shaft to the 4 5/16 length. That way the belts will be in the same alignment at the original belts on the pulley. Some kind of sleeve over the 3 5/32 shift that would extend the length and the diameter to measure to the 4 5/16 measurements. The sleeve would have to have a split in it for the shaft key. Hopefully this makes sense
Click to expand...

I just now got done with mine. 10 minutes ago.
Get a one inch hub from tractor supply.


#9

KrashnKraka

KrashnKraka

lscearce said:
It seam there are two shift sizes used the most the 3 5/32" and the 4 5/16". I want to use the drive puller and clutch from the original motor which is 4 5/16". Therefor I want to extend the shaft to the 4 5/16 length. That way the belts will be in the same alignment at the original belts on the pulley. Some kind of sleeve over the 3 5/32 shift that would extend the length and the diameter to measure to the 4 5/16 measurements. The sleeve would have to have a split in it for the shaft key.

Hopefully this makes sense
Click to expand...

Yeup..no worries, onto it. So are others.
As <gainestruck> writes, if you cannot source off the shelf take the drive pulley and motor to a machine shop. You are onto belt alignment so would be able to quote a length required to fit clutch. Do make a note so you can pass on the mod to a new owner, one day :)


#10

Carscw

Carscw

KrashnKraka said:
Yeup..no worries, onto it. So are others. As <gainestruck> writes, if you cannot source off the shelf take the drive pulley and motor to a machine shop. You are onto belt alignment so would be able to quote a length required to fit clutch. Do make a note so you can pass on the mod to a new owner, one day :)
Click to expand...

? ? ?


#11

KrashnKraka

KrashnKraka

Carscw said:
? ? ?
Click to expand...

Okay..try this on.
Where the drive pulley sits in relation to how/where an adaptor
sits on the new engine shaft is maybe critical to retain drive belt
alignment when the modded 'shaft/adaptor' is fitted.
A machinist would need to know the distance from base plate
to centre of drive belt pulley ("V") to be able to build the adaptor
"connection length".
The adaptor, after the drive pulley, will carry the clutch pack
and thereby the blade belt pulley, as per the original design.
So you would need to provide the machinist with the measure
for the length of the adaptor required to also mount the clutch pack.

Clearer?

KK


#12

Carscw

Carscw

KrashnKraka said:
Okay..try this on. Where the drive pulley sits in relation to how/where an adaptor sits on the new engine shaft is maybe critical to retain drive belt alignment when the modded 'shaft/adaptor' is fitted. A machinist would need to know the distance from base plate to centre of drive belt pulley ("V") to be able to build the adaptor "connection length". The adaptor, after the drive pulley, will carry the clutch pack and thereby the blade belt pulley, as per the original design. So you would need to provide the machinist with the measure for the length of the adaptor required to also mount the clutch pack. Clearer? KK
Click to expand...

I get what you are saying now.
But the clutch on most mowers can be a little high or low.
Mine now sits 1 inch lower then it did. My deck has a 4 inch travel. So the pulleys are never inline with the clutch.

Now my hydro drive pulleys had to line up dead on. No room for error with them short belts.

What I did was cut the end of the shaft off the old engine. And used a hub to connect it to the new shaft. Got lucky and my bolt was long.


#13

KrashnKraka

KrashnKraka

....excellent outcome!

KK
/out


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