DK40 SE HST Loader Bolt Torque

[southerniltractor]

Howdy folks,

Does anyone know the torque value for the loader bolts on my 2011 DK40se hst? I'm being lazy and hope someone here has this handy!

Thanks,
Mike

 

[Highgear]

Is that a trick question ?

 

[rademamj1]

Tractor loader bolts have an industry standard to follow, based on the grade and thickness of the bolt. Here is the torque requirements for your loader bolt. It does require you to measure bolt thickness and determine grade of that bolt. It all takes just 5 mins.

 

[Highgear]

I still think it's a trick Question - are you talking about the keeper bolts that (keep) the pins from falling out ? If thats what your talking about there is no Tec. in America that would get out a Torque wrench to tighten thoes bolts .

 

[Amvcane]

Hey, that's my cutting board and granite top in post 3.

 

[rademamj1]

Hey, that's my cutting board and granite top in post 3.

Yep...recycled your photos.
But they definitely provide the torque specs for most bolts on a tractor.

 

[Amvcane]

Glad to help.

 

[southerniltractor]

Howdy folks,

Attached you will find an image of the loader bolts in question. They look unlike any other metric bolt I've seen in the past and as described in metric bolt tables I've found on line. My neighbor has an LS tractor with clearly marked loader bolts being 10.9 class metric fasteners.

Any ideas?

Thanks,
Mike

 

[murphy1244]

I would use the grunt method.

 

[rademamj1]

Thanks for the photos. Those loader bolts are grade 9 bolts made by manufacturer DS(Korean), and are some of the strongest case hardened bolts ever made. Grade 9 bolts are made with a 8640 Alloy steel which is the ultimate in high strength steel. I think I have seen specs for grade 9 bolts, that suggested they could handle 180,000 psi tensile shearing. And you have 4 bolts for each side of the loader mount.

If they are 3/4" bolts, i would torque them to between 280 to 320 ft-lbs per bolt. That may require you to purchase a very special torque wrench. Otherwise if you get a torque wrench good for 250 ft-lbs, that would be more than safe.

Something under that high torque should never come loose. Are any of your loader bolts actually loose ?

 

[southerniltractor]

Rademamj1, thanks for the detailed and informative response. That all makes sense until I search for "Grade 9 Metric bolt torque" - then I come up empty. I find plenty of information on SAE sizes, but nothing for metric in Grade 9.

I wonder if my dealer installed SAE bolts here? Everything else on this tractor has been metric, but I've observed all kinds of SAE/metric fastener mixing on some domestic trucks and cars.

The bolts on my tractor are not loose, but I like to take a torque wrench around the machine once a year and check lug nuts/bolts, loader bolts, and anything else that may work loose over time. I used to have a torque value for these bolts provided by the dealer service department, but I can't find it and that dealership has changed hands and I'm less inclined to contact them. This is kind of a mystery and now even more so a puzzle to me!

I'll contact the dealer for advice and let you know what I discover.

Thanks,
Mike

 

[southerniltractor]

Hello again,

Called the dealer and his tech says, "Tight enough, but not too tight!'

Lord, I hope I never need them to torque down any critical engine parts...

Still looking!

Thanks,
Mike

 

[southerniltractor]

Holy crap, I have the answers right here! Just need to open a few books and quit being lazy.

Service manual has a great torque chart for the bolts in question. My loader owner's manual has the exact sizes of bolt used in each position.