Torque setting for blade bolts?

[bugspit]

I'll check my manual but was wondering If anyone uses a torque wrench to set the blade bolts.
Or do you just tighten the crap out of them, with anti-seize of course?

When double blades are used do you use a slightly longer bolt?

Does Meg-Mo recommend a torque setting?

[metro-hp_48]

Hey Bug, In the discusions from the past, I believe it was stated that the torque on the blades was 75 lbs. The biggest complaint of not having them torqued enough, was that it would make the blades ALOT harder to remove the bolt. (might be wrong about the torque setting......I'll look in the archives. As long as their torqued atleast that much, no prob. getting them broke lose later)

Most all used a 1/4" longer bolt, made of a high grade steel.
Believe Hoss always recommended putting a little bit of oil on the bolts, and spinning the blades (with no burrs, they go right up, together....same to un-do them, break them loose, and spin the blades off........by hand of'course.......might not have been you Hoss, and if not sorry (been many, many years) (could have been Eric)

I know nothing about Meg-Mo.

[bugspit]

Thanks, a search probally would have found plenty of info, slipped the brain.

[metro-hp_48]

Always good to search.....so much to learn along the way. Hope I told you the right torque specs........I'll search in a min. myself.
(too loose, and the bolts will tighten themselves way too much......making it about impossible to break loose later/atleast alot harder) and go with atleast a 1/4" longer bolt to make up the diff. in the extra blade. (never run doubles myself, but I hear they are great) Later Bugspit! (kool a$$ name BTW)

[metro-hp_48]

Here is one old thread Bug, that will atleast tell more about the "self-tightening" effect caused by blade bolts not tightened enough. (have seen diff. torque specs. for blades, form 55-120 so not sure what to tell you, but from what I hear, tighter is better (to an extent)
http://www.lawnsite.com/showthread.php?s=&threadid=28535&highlight=blade+torque

[NC Scaper]

at our shop we just tighten them with a air wrench but i do wonder at times how much torque we are putting on them

[bugspit]

Originally posted by NC Scaper
at our shop we just tighten them with a air wrench but i do wonder at times how much torque we are putting on them

Well, what you do is tighten your nut/bolt with the impact and then use a torque wrench, starting at a low setting and keep raising it until the nut or bolt moves. that will give you an idea of how much torque you're applying with the air impact.

Try this several times and depending on consistent conditions of air psi this could be a means of calibrating your air tools.

Thanks Metro for your input.

[NC Scaper]

we always have a torque wrench to use but we are not going to waste our time doing that, being a mechanic i don't believe i need to know how to use one either

[bugspit]

WELL, EXCUSE ME.
Had no idea you were a mechanic, thought I'd offer some friendly advice.

[dishboy]

Exmark TTHP owners manual 115-120 ft. lbs.

[bugspit]

[QUOTE]Originally posted by metro-hp_48
[B]Hey Bug, In the discusions from the past, I believe it was stated that the torque on the blades was 75 lbs. [B]

You were correct, 75 ft lbs is stated in the manual of a Scag tiger cub.
The bolt is all the through the spindle with a nut on top, very easy to change blades.
And this design reduces the chance of having a bolt stuck and if so a repair would be quick.
Love my Scag,

and yes, I torqued the bolt.

[SCAPEASAURUSREX]

Why use longer bolts with doubles ???? You just need to remove a spacer so the cutting height is correct anyway.... If you use a longer bolt and change notheing else the cutting height will be about a 1/4" lower than it should be.........................

[metro-hp_48]

Originally posted by SCAPEASAURUSREX
Why use longer bolts with doubles ???? You just need to remove a spacer so the cutting height is correct anyway.... If you use a longer bolt and change notheing else the cutting height will be about a 1/4" lower than it should be.........................

On some mowers, a 1/4" longer bolt was needed. Not all by any means. Never ran doubles, and have never needed to.

A search will answer any of your longer bolt questions.

[CNE]

German torque specifications- goodentight.
Redneck torque specifications- tighten her til she strips, then back off a quarter turn.