Flywheel key. Engine kickback - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 14 (permalink) Old 06-15-2019, 10:05 AM Thread Starter
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Flywheel key. Engine kickback

Hi guys,

My dad brought over his cub cadet push mower. He said he hit something and now when he pulls the cord it almost rips his arm off.

At 1st I thought it was just the pull cord that was tangled and it was but after fixing that it almost ripped my arm off lol.

So after a few YouTube videos I now know that I have to concentrate on the flywheel key.

Issue is that I dont have a pulley. So I'll try to take it off with a prybar and hammer.

If I cant then I'll head over to a store that has a pulley.

Wish me luck
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post #2 of 14 (permalink) Old 06-15-2019, 11:44 AM Thread Starter
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I ended up ordering a pulley on amazon. I didnt want to wreck anything.

The key tho is really hard to find in stock around town. I'll have to order it.
Part number 951-10307
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post #3 of 14 (permalink) Old 06-16-2019, 02:18 AM
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Looks like that flywheel is wedged on their nice and tight now with the mangle shear key rolled under it.

Mark - 2002 John Deere LT150H

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post #4 of 14 (permalink) Old 06-16-2019, 05:55 PM
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im late to the party but it comes off by whacking on the flat parts of the top or hitting it on the sides of the flywheel while using your hand to lift upwards on it

never, never, never pry on anything as everything you will pry on is soft aluminum that will crack and break.

use impact to remove the large nut then a 4 lbs maul whacking the flywheel makes it release. some take a good 8 or 9 good whacks while some come right off with just one whack.

You can only learn if you ask the question, so there are no dumb questions.
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post #5 of 14 (permalink) Old 06-16-2019, 09:20 PM Thread Starter
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Hi guys,

I got my puller from amazon. And the flywheel came off real easy.

My issue now is the key. I cant get it out. I'm trying to get it out with pliers but it's really jammed in there.
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post #6 of 14 (permalink) Old 06-16-2019, 10:42 PM
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I'm confused. The key in the crankshaft looks perfect. Is that a new key and you are trying to remove the broken key from the flywheel?


You can use a small chisel to hit the old key on the top while angled away from the crankshaft.

Experience is something you don't get until just after you need it.
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post #7 of 14 (permalink) Old 06-17-2019, 12:45 AM Thread Starter
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The key In the crankshaft is the old one.
I have a new one ordered but it wont be here for another week. If it looks good then something else is causing the kickback?
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post #8 of 14 (permalink) Old 06-17-2019, 02:47 PM Thread Starter
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Hi guys,

I finally got the key out by gripping the key with cutters and then hitting the cutter handle. I tried with a punch and it wasnt moving.

The key looks in good shape besides for the punch hits and the cutters.

So if the new key doesnt help then I'll try and look at the valve adjustments or a cam shaft gear?
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post #9 of 14 (permalink) Old 06-17-2019, 10:41 PM
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Did you or your father remove the blade and never put it back on? The engine HAS to have the blade on for centrifical force or the engine will kick back.
Valves out of adjustment or a bent push rod could be another reason.

Experience is something you don't get until just after you need it.
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post #10 of 14 (permalink) Old 06-18-2019, 07:56 PM Thread Starter
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Hi Grunt,

The blade is firmly installed on the mower. While I wait for the key I'll take out my feeler gage and check the valve gaps and the gap on the magneto with a business card.
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