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Sears red jack modification

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Old Mar 3, 2014 | 05:42 PM
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Don't confuse shear and tensile strength figures for the amount of cantilever load one can safely apply to the end of a long bolt.
 
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Old Mar 3, 2014 | 06:18 PM
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Originally Posted by Red Dragons
Appreciate it. Yeah, I didn't realize how strong 1/2" grade 8's are. Each bolt can handle more than the entire weight of the bike, in both tensile and shear loading. I like having peace of mind though.
You`ll have no worries.
 
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Old Mar 4, 2014 | 12:05 PM
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Originally Posted by lo-rider
Don't confuse shear and tensile strength figures for the amount of cantilever load one can safely apply to the end of a long bolt.
Very true, but the load limits for each bolt are still very much higher than the weight of the entire bike.

However, I left the bike on the jack overnight last night and this morning I'm definitely noticing some slight bending of the two rear bolts.
 
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Old Mar 4, 2014 | 01:42 PM
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Originally Posted by lo-rider
Don't confuse shear and tensile strength figures for the amount of cantilever load one can safely apply to the end of a long bolt.
That's deep. That's like something Thomas Jefferson would have wrote if he had a doctorate in engineering and metallurgy, and stuff.
 
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Old Mar 4, 2014 | 03:03 PM
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Nice Mod, I will have to try that with my jack.
 
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Old Mar 4, 2014 | 04:19 PM
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Originally Posted by Red Dragons
However, I left the bike on the jack overnight last night and this morning I'm definitely noticing some slight bending of the two rear bolts.
That sounds strange especially because I've left my dyna fully lifted on my modded jack for close to a month (about 4-5yrs ago) while I did cams and various other projects and the bolts never budged an inch.

Ya sure you're using grade 8 bolts 1/2" dia bolts?

This may help:
 
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Old Mar 4, 2014 | 07:17 PM
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Originally Posted by SC-Longhair
That sounds strange especially because I've left my dyna fully lifted on my modded jack for close to a month (about 4-5yrs ago) while I did cams and various other projects and the bolts never budged an inch.

Ya sure you're using grade 8 bolts 1/2" dia bolts?

This may help:
Yes sir. I am actually a mechanic. I think I may have not torqued them down enough and the bolts are just angled slightly. I deliberately didn't want to over tighten them so that the jack wouldn't bind, but I may need to tighten them more.
 
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Old Mar 4, 2014 | 07:26 PM
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Mine has been on my lift going on 5 months and no bending at all.
 
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Old Mar 5, 2014 | 05:48 AM
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Originally Posted by Red Dragons
Yes sir. I am actually a mechanic. I think I may have not torqued them down enough and the bolts are just angled slightly. I deliberately didn't want to over tighten them so that the jack wouldn't bind, but I may need to tighten them more.


Yeah, you might want to tighten them a little more. Be mindful of getting it too tight or the lift arms may bind. I may have used a dab of grease on either side of my spacers just to keep it smooth.
 
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Old Mar 5, 2014 | 06:10 AM
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Did this mod and my bike stayed on the lift for a couple months after with no problems. Works great for me
 
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