New 149 today!! plus ?? on shear pin

cub149 · #1 06-23-2009, 09:39 PM

Hey all, I got a 149 today. It has a five year old kohler in it that was bought new. A retired school teacher had it for the past 25 years and put in a new motor 5 years ago. Today he was mowing with it and the shear pin sheared at the flywheel. He was looking for an excuse to get a larger mower and this did it for him.
My question is what could cause the pin to shear? When the enigine is running the little bit of friction between the flywheel and drive shaft is spinning the driveshaft, not enough to work the pump but it seems to spin ok. I took some pictures and it is dark here but I think you can see what I am trying to show. The driveshaft coupler looks like it is wallowed out and I am thinking this may be what caused the shear? Shouldn't there just be a slot the same thickness from front to back? At the back where the pin rests most of the time the slot is doubled in size, almost making an extra hole. If you look close towards the back of the slot you can see it.
Also, take a look at the rear end, a sleeve hitch, nice bonus. It is still a pig in a poke as it's hard to hear the engine good with all the noise the coupler and driveshaft is making rubbing together, and for the price I just wanted to get it loaded before he changed his mind.
Yea, I'm a little excited as of now. My 149 (engine) is so tired I was worring about it making it through the summer so this will probably be going into it.
Chip

ACecil · #2 06-23-2009, 10:10 PM

Nice 149 Chip! Good luck, with it.

Diz Jr. · #3 06-23-2009, 10:12 PM

Nice score cub149

Yes the slot should be the same front to back. They wear with the pin riding on it in the same place all the time. Mine was like that when i got it, and the pin was also worn about half way through as well. So if yours was like that too the pin could have just let go.

RPalmer · #4 06-23-2009, 10:30 PM

cub149, Nice tractor. Your "pig in the poke" has a nice tail. Your other tractor must be in really good shape if your gonna pull that engine. Nice score.

cub149 · #5 06-23-2009, 10:34 PM

Are these pins readily available at a dealership or elsewhere? Never had to buy one. And how about the coupler, where can you find those? I haven't had a chance to see what the one on my 149 looks like but it probably is worn also.

Matt G. · #6 06-23-2009, 10:36 PM

You can get the pin at a dealership, but this would be a good time to upgrade to the QL style driveshaft coupler with a rag joint at the front end to eliminate any further trouble. I believe this is discussed in another thread somewhere...I'm just not sure in which one...

cub149 · #7 06-23-2009, 10:41 PM

Quote:

Originally Posted by RPalmer

cub149, Your other tractor must be in really good shape if your gonna pull that engine. Nice score.

It's doesn't really look any better but it is tight and the tranny is strong. I will get this one going and see what the tranny is like, if all is good I may just switch out the better parts of mine to this one. The new one has some issues, crack in dash, steering column is shot, headlights missing, etc.... And I'm sure I will find more once I get a chance to smoke it over more. I know all this would be easier to change out but we will see.

cub149 · #8 06-23-2009, 10:42 PM

When he had the engine instaled he also had a digital tach/hour meter mounted on the dash. It is showing 85 hours. How accurate are these meters?

aagitch · #9 06-24-2009, 04:14 AM

Depending on what the PO was using it for, 85 hours is probably about right. I'd just rebuild the drivetrain and use it

RPalmer · #10 06-24-2009, 06:51 AM

cub149,

I just redid the drive line in my 129. Here is the link. I hope it works.

A lot of members contributed some very good information to help me through it.

http://www.onlycubcadets.net/forum/showthread.php?t=802