Author Topic: Drive pulley on a 18hp briggs and stratton I/C  (Read 27882 times)

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Offline huntersdad

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Drive pulley on a 18hp briggs and stratton I/C
« on: September 28, 2009, 10:14:26 pm »
Im new to the sport and just had a question on my output shaft I have the drive and blade pulley on the same shaft the pulleys seem to be welded as if they are one unit I was wanting to swap the drive pulley but cant seem to get the stock one off is there anything else that can use to bypass this

Offline jerb

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #1 on: September 28, 2009, 11:33:08 pm »
they are one unit, and if you building a racer, the blades and all the drive for the deck should be long gone!!
Tim Jerby
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Offline huntersdad

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #2 on: September 28, 2009, 11:43:28 pm »
yes they are. The issue i have is that i want a little bigger than stock on the drive pulley I Had thought of cutting the lower part of the shaft off that has the blade pulley on it but I was needing to get rid of the stock drive pulley first somehow

Offline jerb

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #3 on: September 28, 2009, 11:47:06 pm »
Is this a racer you are working on?
Tim Jerby
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Offline huntersdad

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #4 on: September 28, 2009, 11:51:25 pm »
Yes thats what I was hoping to accomplish but Im stuck at the very beginning of the build I tried asking questions at the local mower shop but they werent very helpful I need to get pass this so I can go deeper into the build

Offline jerb

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #5 on: September 28, 2009, 11:55:07 pm »
not to discourage, but the beginning of the build should be chassis work, steering work, brake work, related safety gear, etc......
Tim Jerby
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Offline Toadworks

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #6 on: September 29, 2009, 12:01:27 am »
yep and to do the chassis work it is helpful to have the motor out of the way, therefore;

It sounds to me like you have just started to tear down a mower. The stacked drive pulley should be a 1" keyed bore unit. It will seperate from the shaft end of the crank with a bit of work. There should be a bolt/washer on the very bottom after removing that you can soak the shaft with penetrating oil (like PB Blaster) After that has soaked in for a few hours/days it may simply slide off. If not you can carefully cut through the pulleys and the bore and split the thing open to remove it. You have to be carefull when cutting not to score the PTO. I always try to line up my powered hacksaw with the keyway so if I go to deep I score the key and not the shaft.

Offline huntersdad

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #7 on: September 29, 2009, 12:04:25 am »
I totally agree but  having all that accomplished and no way to put power to the tires would be like a tank with no engine so to speak what I was hoping to do was to atleast have the drive-train or atleast a start of one then break it down and then do the mods It would be alot of work not knowing first if it would even move

Offline Toadworks

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #8 on: September 29, 2009, 12:07:49 am »
No no no you can't simply trust that the original factory steering and brakes are gonna stay together, they are too weak. Tear it down and build it back up as real machine, it will move just fine. Make it safe BEFORE you make it fast, PLEASE. As your nik says Hunter NEEDS his dad!!!

Offline huntersdad

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #9 on: September 29, 2009, 12:11:34 am »
toadworks both the drive and blade pulley seems to be welded to the output shaft the keyed part looks to be that the output shaft has been stamped as to create a dove tail configuration that slides onto the crankshaft
I am in no way going to even try to run it at speed at all if any thing just far enough as to say awww ok thats what i needed I have some tubing that i will be using for the bracing

Offline Toadworks

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #10 on: September 29, 2009, 12:16:00 am »
If the stacked drive pulley is welded to the PTO then I'd just leave it alone. I'm thinking some one else worked on it that "patched" it back together??

Offline jerb

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #11 on: September 29, 2009, 12:17:51 am »
they can be real stubborn to get off, if its welded on by a previous owner, take a hand grinder and ground the weld off!
Tim Jerby
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Offline huntersdad

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #12 on: September 29, 2009, 12:23:50 am »
believe me i tried that already seems that it was tacked to hold it then welded  The guy at the mower shop told me that what i have was sold as a unit and they could not be removed independantly this mower belonged to my father who bought it new and I dont know of him having it welded hes not the type to (RIG) anything

Offline Toadworks

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #13 on: September 29, 2009, 12:28:22 am »
Are you trying to just remove one pulley from the stacked unit?

Offline jerb

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Re: Drive pulley on a 18hp briggs and stratton I/C
« Reply #14 on: September 29, 2009, 12:32:54 am »
they are one piece!! to get one off you take both off!!
Tim Jerby
2010 round 2 monster energy drink mod-x champion
2009 mowfast mod-x champion
2009 mowfast sportsman runner-up
Coming soon...super mod twin!