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Torque Spec's For Blade Bolts ?

#1

P

polarisgold

I have an old Dynamark 12hp B&S engine. All numbers from frame are gone so I can't get any info on the deck.

I want to torque the bolts proper. The last bolts from the spindals broke off.

Didn't think I was that strong....

To what specifications should these bolts be torqued??


#2

reynoldston

reynoldston

I am guessing they are a 7/16 grade 8 bolt. 78 ft. lbs.


#3

P

polarisgold

I am guessing they are a 7/16 grade 8 bolt. 78 ft. lbs.

I will check diameter.

Thanks again!!


#4

M

motoman

The Intek 48 " deck blades (3) are 45-55 ft lbs per manual. Don't think they are grade 8 , probably grade 6.

Did you find a welder? A few Aluminum guys in Idaho craigslist but mostly around the cities, looks like.


#5

H

hitmanharleyk

The Intek 48 " deck blades (3) are 45-55 ft lbs per manual. Don't think they are grade 8 , probably grade 6.

Did you find a welder? A few Aluminum guys in Idaho craigslist but mostly around the cities, looks like.

Grade 6????????? Who sells a grade 6?


#6

reynoldston

reynoldston

Grade 6????????? Who sells a grade 6?

Any hardware store or auto parts store. One of the easiest grades to find. It will be harder to find grade 8. As I said I was just guessing what bolt was holding the blades on and I get most of my torque specs from a chart which is by grade and size.


#7

H

hitmanharleyk

Down south all you see is grade 8, grade 5 and grade 2, but mostly 5 and 8.

And not to hijack a thread, but you are talking hex head capscrews right, not bolts?


#8

M

motoman

Hey Hitman, I know the South is NASCAR country . Maybe grade 8 is common because everything is for race cars :smile: Seriously if the bolt is not 8, aren't you afraid of snapping it? I'm glad I don't have to apply 80 ft lbs upside down on the ground to my blade fasteners . They are 5/8" Regards Motoman


#9

P

polarisgold

The Intek 48 " deck blades (3) are 45-55 ft lbs per manual. Don't think they are grade 8 , probably grade 6.

Did you find a welder? A few Aluminum guys in Idaho craigslist but mostly around the cities, looks like.

Don't need a welder....yet. The straight pipe with muffler is still hanging on.

Problem now is belt seems to be too loose. I just got through replacing both spindals and now they barely rotate. There seems to be only one way to run the deck belt. Can't find any info on my specific deck due to the chassie label missing. I have found two different manuals with pictures of their decks and they are so similar to mine I don't see how I could have installed the belt wrong. But something is fried! It cuts fairly well for 10 feet and peters out.

I'm stumped.


#10

P

polarisgold

I am guessing they are a 7/16 grade 8 bolt. 78 ft. lbs.

I completely forgot that my Mac torque wrench is broken.

I'll just moose them on and check them often.

Sorry to have bothered you but thanks for the reply.


#11

S

soulman

Grade 6????????? Who sells a grade 6?

Any hardware store or auto parts store. One of the easiest grades to find. It will be harder to find grade 8. As I said I was just guessing what bolt was holding the blades on and I get most of my torque specs from a chart which is by grade and size.

There are no grade six fasteners, at least for any type of normal use. Grade 2 or 5 are easiest to find, grade 8 not that difficult.


#12

reynoldston

reynoldston

Down south all you see is grade 8, grade 5 and grade 2, but mostly 5 and 8.

And not to hijack a thread, but you are talking hex head capscrews right, not bolts?



Just looking at a chart and not thinking, you are right grade 5. Yes we call them hex head cap screws here in the north, also as being the proper name. But also this isn't a english test. Yes when I order new hardware I call them hex head cap screws. I guess here on the forum I just call them a bolt just like most prople do.


#13

H

hitmanharleyk

The reason I asked was that is what I do for a living, I sell "nut's and bolts" plus other industrial maintenance supplies.


#14

reynoldston

reynoldston

The reason I asked was that is what I do for a living, I sell "nut's and bolts" plus other industrial maintenance supplies.


If I am buying a large amount of hardware I buy from a company called Fastenal. If I just need just a small amount Tractor Supply Co. sells nuts and bolts by the lb. Around here the local hardware store is too expensive to buy nuts and bolts. I find most cap screws I buy are a grade 5 unless I want them to shear off easy like rototiller shafts I use a grade 2 and I use a grade 8 on mower blades. I guess still being old school yet I still use like to use inch and foot lbs. but seeing that meteric fasteners have taken over we will have to change with the times and start useing Kilograms or what ever you want to call them.


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