Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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Changing out the blades...are the attachment bolts reverse thread or normal, i.e. clockwise to tighten?

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Should be clockwise to tighten, use some "PB blaster or Deep Creep" penetrating oil on the bolts before trying to take them off. It will help.

Posted on Sep 26, 2009

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1 Answer

In what direction loosens the bolt holding the blades on?


Normally on fast moving parts the direction of turning determines the direction of thread. I say normally, but this will not be the case EVERY time, just more often than not. If the blades travel in a clockwise direction, then the bolt will also tighten in a clockwise direction. So, if counter clockwise is the direction of turning then so will the bolt. This is because if the turning of the bolt was opposite to turning of the blade, the bolt could unscrew itself whilst in use and that could end in tears

Sep 28, 2015 | Garden

1 Answer

How to replace cutting blade


Before ever touching the cutting blade remove the plug cap from the spark plug ( this is in case the engine should fire whilst turning the blade ), tilt the mower backward onto its handles, the bolt size for the blade is normally a 9/16 and will be a normal right hand thread ( turn bolt anti clockwise ) the bolt will be tight i would suggest a socket or if you have, or can borrow an impact wrench this will make things much easier, once off replace with a new blade, make sure the new blade aligns with any pins on the blade carrier conected to the crank, insert and tighten the bolt.

Feb 07, 2013 | Poulan Garden

2 Answers

Can't unscrew arbor nut on my MS250 Delta Miter Saw. Tried everything to turn it counterclockwise with no success.


The arbot bolt on your saw has reverse threads or righty-loosey, lefty tighty. You should be turning it clockwise as you are looking at it or in the same direction the blade turns when cutting. The arbor bolt on these saws are reverse thread so that they are self tightening while the saw is in use.

Feb 08, 2012 | Saws

1 Answer

To loosen blade bolt, is it counter clockwise or does it have a reverse thread? also is there a trick to removing spark plug wire?


The bolt should be a normal left to loosen, right to tighten.

The plug wire should just need a gentle twist and pull to release.
They get very sticky after a couple dozen heat cycles.
A shot of WD inside the boot can help with future removals.

Good luck and be careful.

Nov 14, 2010 | Cub Cadet Garden

1 Answer

Does the bolt on the blade come off counterclockwise or clockwise.


If you are facing the blade from where the bolt is, and the blade's normal operation is to turn counter-clockwise, then the bolt will loosen counter-clockwise. This is universally true for any blade which is held on by a center bolt (table saws, grinders, etc.) This is because the motor is turning the shaft counter-clockwise, and the resistance against the blade as it does it's work is clockwise - thus tightening the blade rather than loosening it. If the blade normally turns clockwise, then the bolt will loosen clockwise.

Jun 24, 2010 | Craftsman Garden

1 Answer

Changing the blade,the bolt just keeps spinning either direction


sounds like its striped. may be a clockwise thread or reverse thread. try to pry the bolt up while turning

May 24, 2010 | Sears Craftsman 7-1/4 in. Circular Saw...

1 Answer

Are the nuts holding on the blades reverse threaded?


If a blade, when viewed from above, rotates clockwise, it will have right-handed threads. This is because the shaft is turning to the right, and the resistance imparted on the blade will tend to tighten a right-handed fastener. If a blade rotates counter-clockwise it will have a left-handed fastener. I don't know this mower, but this is a universal thing.

Apr 23, 2010 | Husqvarna 26 Hp 54" Deck Zero Turn Riding...

2 Answers

How do i change the blade on my delta 10" mitre saw


Exploded diagram for your SM100M miter saw is here.
User manual is here.

Page 20 covers blade change operation.

Make sure you unplug your saw! You need to remove a screw from the cover and rotate the cover to the rear. Use a hex wrench in the motor shaft to keep the saw blade from turning, and loosen the arbor nut with a 1/2" wrench. The arbor is reverse threaded, so you'll turn it clockwise to loosen, then counterclockwise to tighten it up after you have swapped the blade.
Rotate the cover back after that's done, and replace the screw.

If this was useful, please vote. Thanks.

Nov 23, 2009 | Delta SM100M 13 Amp 10" Compound Miter Saw

2 Answers

I have tried numerous times to undo a nut on my Black and Decker circular saw without success. which way do I turn the nut to undo it and take the circular saw blade?


Am I correct that this is a hand-held saw? Want to make sure of the terminology.

If so, the bolt holding the blade has right hand threads -- meaning it loosens by turning counter-clockwise.

Is there a blade lock? Are you using it?

Apr 30, 2009 | Saws

5 Answers

Changing the saw blade on a Ryobi Mitre saw


There may be a push button type blade lock, and on many of these saws the retaining bolt for the blade is backwards threads, e.i., looking at the top of blade retaining bolt, turn it clockwise to loosen. This would normally tighten, but in the case of many of these saws, it loosens it.

Jan 04, 2009 | Ryobi ZRTS1342L Factory-Reconditioned 14...

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