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  #1  
Old 01-23-2007, 11:50 AM
Uncle Hook Uncle Hook is offline
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Air Wrench / Impact Driver for Lawn Mower Blade Removal?

I am looking for some advice on selecting a tool to make it easy to remove a lawn mover blade. As I have gotten older, my strength is not what it used to be and I struggle remove the blade when the bolt is put on too tight.

I recently purchased a 1/4" Milwaulkee Impact driver which is just great for driving screws & bolts. Big imporvement over a cordless drill. I like the torque this tool provides, but I am not sure how well it will work for removing the lawn mower blade.

I am wondering if an air wrench like this would be a better tool.

http://www.harborfreight.com/cpi/cta...emnumber=47214

I like the shape of this tool for getting under the lawn mover without having to turn the mover on its side. Will an air wrench like this provide sufficent torque to remove the bolt? I have never used an air wrench.

Or do I really need an air powered torque wrench - somethng like this?

http://www.harborfreight.com/cpi/cta...emnumber=53176

What do you use / what would you recommend?
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Old 01-23-2007, 12:02 PM
SheriffPopeCo SheriffPopeCo is offline
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My advise. Look around find a impact tool 1/2" or larger
that has 600ft lbs of torque. This would probably be able
to take lug nut off a car also. The little torque wrench
has only 50-60 ftlbs of torque. I use mine the same way
you want(lawn mower blades etc..).
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Old 01-23-2007, 12:07 PM
TheRic TheRic is offline
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Save your money!!! Use the impact driver you already have. Check out the spec's, I'll be willing to bet it has more than enough torque to do the job. It might even have enough to torque the head off the bolt. At the very least try it first!!!
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Old 01-23-2007, 12:28 PM
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LCHIEN LCHIEN is offline
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the air wrench will just end up spinning the blade and motor around.
You need an impact tool or you will have to supply the manual counter-torque to the blade and motor.

The impact tools will pop the bolt with short rapid bursts of energy that will let the inertia of the blade and motor keep it from turning.

I don't think the bolts on the lawnmower are that big (can use with 3/8" socket sets), probably your electric impact driver will work if you have socket adapters for it. Try it anyway.

I don't think you need to torque the bolt excessively when putting it back on, it has a hub that engages the blade to keep it from spinning and the bolt should have a lock washer IIRC (been a while - I have someone doing my lawn now).
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Old 01-23-2007, 12:59 PM
onedash onedash is offline
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my craftsman air rachet works great for stuff like that. It still turns in tiny increments like an impact gun so stuff that normally requires brute force to hold still (like a lawnmower blade) when you use a wrench you dont any more. So almost any time I need to remove a bolt like that thats what I grab. Wheels on a grinder is another one its great for.
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Old 01-23-2007, 01:51 PM
LinuxRandal LinuxRandal is offline
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Is the problem the typical one, where the blade wants to turn why you are trying to loosen the bolt?

If so, just go to Lowes.com and search Item # 188341
Model # BB-100 blade buster. I use that and a either a breaker bar, or one of my 1/2" flex head ratchets. Since they saw me using it at the garage, I always get asked if it can be borrowed.
Not sure if this will take directly to it if Lowes allows:
http://www.lowes.com/lowes/lkn?actio...100&lpage=none

Air ratchets, typically still need the bolt broke loose, and if you have to turn it over enough for an impact wrench, you might as well turn it over.
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Old 01-23-2007, 02:15 PM
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Tom Slick Tom Slick is offline
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as has already been mentioned; I'd give your cordless a try, they can be amazingly strong. air rachets have very little torque.
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Old 01-23-2007, 02:42 PM
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Along with many other tools I have a 3/8" dr Blue Point air ratchet. Blue Point is a Snap-On value brand. For breaking fasteners loose it is next to worthless if any torque is needed, the same is true of tightening. To remove my John Deere's blades I use ] this ratchet 15" 1/2" dr which gives me plenty of leverage. Before I replace the blade bolts I coat them with anti-sieze which seems to keep them from becoming too hard to remove.
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Old 01-23-2007, 03:00 PM
Uncle Hook Uncle Hook is offline
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Quote:
Originally Posted by TheRic View Post
Save your money!!! Use the impact driver you already have. Check out the spec's, I'll be willing to bet it has more than enough torque to do the job. It might even have enough to torque the head off the bolt. At the very least try it first!!!
I checked the specs and I was surprized to learn that my little Milwaulkee 1/4" Impact Driver has a Torque rating of 740 in.-lbs. I thought the tool would be unsized / underpowered for the job, but I going to give it a try before I do anything else.

Thanks to everyone for their ideas and suggestions.
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Old 01-23-2007, 04:14 PM
crokett crokett is offline
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In the past I've had problems with powered tools torqueing the heads or rounding off bolts/screws etc. I prefer to back out stuck bolts the old-fashioned way - a longer handle on my wrenches. that way I can feel if it is not moving like it should.
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