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I've got a 430 with 60 inch deck. Got new blades, washers and bolts to install. Is there a torque spec for installation?
The deck on my X750 calls for 50 ft/lbs. So I'm guessing its going to be about the same for the deck on the 430 ? :unknown:
 

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If it’s the same bolt diameter it should be.

I have never torqued a mower blade.
 
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I'm of the same opinion as rydplrs. If they are the same bolt size, 50 should be adequate.
BTW, were you shocked at the price of the cupped washers? I need one but can't find that large size for less money. I lot of my go to net sources don't even list that one.

tommyhawk
 

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Discussion Starter #4
I'm of the same opinion as rydplrs. If they are the same bolt size, 50 should be adequate.
BTW, were you shocked at the price of the cupped washers? I need one but can't find that large size for less money. I lot of my go to net sources don't even list that one.

tommyhawk


Yes, high dollar for sure...12.01 each. Almost as much as the blades...and they're not even green !
 

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X750, I just happened to see a PDF of TM1594 over on WFM, that supposedly covers all (?) the 60" decks. There was a torque spec listed for the blade bolts of 83 ft. lb. My 420 is an '83 model and the deck is in the earlier s/n range, so I believe it to be original to the tractor. The bolts are .500-13 UNC, grade marking not legible. JD lists them as GR. A17D which is probably their own code for one of the National Standards, such as Gr. 5 or Gr. 8. From the torque chart the .500-13 Gr. 5 lists 80 dry, 63 lubed thread. Grade 8 as 115 dry, 88 lubed. I would suspect the newer decks have metric threads and the torque spec would be close but slightly less if smaller and similar in grade.

I will likely just honk mine down with a box end wrench as usual, then see how close I came using a torque wrench. On the smaller 46" cut decks I am used to doing this way, no blade bolt has ever loosened so far. They seem to just get a little tighter.

Sure doesn't hurt to do it the right way with the torque wrench though.

tommyhawk
 

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Tommyhawk,

What size is the washer you need? I have a few kicking around but I didn’t label which ones came from which deck.
 
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I have a 60 parts deck from my 430 and have the washer you need if Keith doesn't have one.
 
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