How can I get a stuck lawmower blade bolt off?

Question

I have tried WD40 spraying daily for two weeks but lawnmower blade bolt won't budge.

Answer 1

Try aero kroil from kano labs http://www.kanolabs.com/

Righty tighty Lefty loosey While look at the nut. Even I get confused when faced with a stuck nut. Mower go in a clock wise rotation. The nut spins off counter clockwise, while looking directly at the nut. I'd save using a blow torch for a last resort. It can damage the shaft. Heat the nut, not the shaft. You want the nut to get bigger.

The aerokroil really works. Spray it on the threads and nut, wait a few minutes and the nut comes off. If your blade nut is really stuck, spray it with aerokroil wait a day and it will come off.

Another trick, is use an impact wrench. Especially if the blade hit something, like a rock... Or while using the wrench, tap on the nut as you try to turn it. A final solution is to crack the nut off. There is a tool which drives a harden blade into the side of the nut. Use it on opposite sides. The nut will crack in to two pieces. Replace the nut..obviously.

I buy aerokroil by the case.

I am not selling aerokroil and get no money for recommending it. It really works.

Answer 2

The way the torch works when heating it up is, You don't want to heat the bolt but the metal surrounding the bolt. If it is a nut then heat the nut then it will expand but if its a bolt. You want the metal to expand not the bolt. Also is this a push mower or a rider? If you use heat on a bolt, you my cause the heat to migrate towards, on a push mower to the crank seal causing oil leakage. A rider causing damage to the bearing seal in the deck carrier. Keep the blade from turning, block it , it may be left hand threads.
In the shop the two ways I have used is a wrench an hammer, tap the wrench to cause a impact effect. The other is you can get at a auto parts store is a impact driver. put the right socket on it an hit it. It is cammed to cause a impact to loosen it. Be careful with a cheater bar if the bolt is trying to sieze you will twist it off. Once off clean the threads and buy some anti-seize put on the threads an reinstall.
WD-40 is a water displacement an will not cause rust and penetrating oil will help if you can get it to work into the threads.

Answer 3

Spritz a little WD-40 (or whatever is the UK's version of convenient aerosol all-purpose oil), give it a couple of raps, let sit for a few hours. Repeat as necessary. I've also had good results covering the bolt with automatic transmission fluid and allowing it to soak for a few days. I checked the manuals and yours is NOT a left-handed bolt, so it's lefty-loosy just like always. But sometimes when you've got an especially stuck bolt, giving it some torque in the tighter direction before trying again to loosen can help break the bond. Whatever you do, don't apply heat. Too many ultra-lightweight plastic components on your mower for that. Good luck.

Answer 4

Don't heat it up....It will make the bolt soft and could cause it to break off. Get some "Liquid Wrench". Apply it to the head of the bolt. Let it set for 15 minutes and then try to loosen it. If that does not work, try it again. Make sure you are turning the bolt in the right direction. It turns clockwise in mower blades. This is opposite of normal bolts.

Answer 5

Get some bb blast at the auto supply, and tap it lightly as you direct the little nozzle spray into the thread, this will vibrate the bb into the thread. Give it a couple goodv whacks to shock the froze thread and also tap the wrench in the direction of off. Most lawnmowers have right hand thread and will loosen to the left, or counter-clockwise.

Answer 6

If it is stuck. Get a Impact wrench. You can buy an electric. Block the blade with a 2x4 and hit the switch. It will come off. Or attach a 4' pipe over a regular wrench and make a cheater bar. It should come off either way.

Answer 7

Try some good old Coca-Cola, the acid in the soda will help to remove the rust and corrosion, that should help get the bolt off. If the bolt is just stripped or cross threaded, it's a whole nother story, but coca cola should do the trick. WD-40 Actually causes more rust to form instead of helping to get rid of it.

Answer 8

Try to heat it up with a propane torch or some kind of heat source, the threads will expand and let go, i have never seen reversed threads on a blade but good previous point, good luck

Answer 9

This might sound silly, but are you turning it the right direction? In some cases - as with rotating objects - the bolts are left hand thread instead of right hand. Try turning it the other direction.

Answer 10

What are you trying to turn it with? Have you tried an impact wrench? That is really the best way to get one off. If you don't have one, maybe a friend has one you can borrow. Good luck.