Question about Caterpillar D6t Xw Elevated Sprocket Dozer With Ripper

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Torque settings Please advise if we need to reduce the torque setting on 12.9 grade track bolts if we use Res Q Steel on treads. Some say you reduce torque up to 20 % to get the same touque as the delivered lubricated bolt this is normally just a fine spray oil .

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  • Caterpillar Master
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I'd say not, if the standard bolt is oiled for installation. The MSDS on Res Q Steel

http://tradetools.co.nz/products/2835235

does not offer much info apart from the fact that it is an oxide loaded paste, seemingly like read lead. It does not have any moly compounds or other EP sulphur-phosphorus compounds etc listed in it, so it should not be any more slippery than the oil.

Basically that is what you would be concerned about, that this stuff will offer less frictional resistance as you turn the bolt, thereby giving a higher tension for the same torque.

12.9 is a high-stress alloy, in fact the highest in ASTM F568M. So on the face of it, unless you already have the bolt stress up near yield on oil coated bolts, there is no reason to reduce torque.

If it is a safety critical application, you should apply the Res Q gunk to a bolt, or 2, and torque it up until it yields and goes loose. Take a note of the torque reading on this test and you will know how much of a safety factor you have.

Posted on Nov 26, 2013

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