Need help with metric bolts sizes and grades

[kco]

I would never use torque sticks, use a 6 point socket and a half inch drive click type torque wrench. For smaller bolts use a 3/8 inch drive wrench, I also like to use ant seize compound and set the torque to the lower value in the range.

I'm glad I did my 50 hour service myself as it forced me to learn more about the tractor and need to regularly torque the loader bolts. Besides, it was a good excuse to purchase a 1/2" torque wrench. --which was on sale for 60% off.:thumbsup:

The Kioti loader manuals specify the bolts should be torqued every 25 hours but that is not mentioned in the tractor's Owner's Manual.

I used the average of the minimum and maximum values to torque the bolts.

 

[grsthegreat]

I've attached the torque table my dealer sent me for the the JIS 7T and 9T bolts.

thank you

 

[sriddle1ny]

I've attached the torque table my dealer sent me for the the JIS 7T and 9T bolts.

Kco,

I feel a Primal Scream Building Those Sten-ken Bolts !!:shocked:

I recently purchased an '04 JD 790, it has a Yanmar Engine MODEL: 3TNV82A-LJNT (so-far-so-good). Since I've just completed all the fluid and filter changes I thought I'd tackle the Thermostat remove and replace task. :cool2:

The on-line JD Parts Catalog excerpt (attached) you'll see PN: 19M7867 (Key # 6) for (2) Bolts attaching the COVER to the top of the water pump assembly. There's usually some additional information in the REMARKs Column like the diameter and length, this time however nothing.

So off to the internet search and I found a JD1200A (attached) using the same PN (Key # 7) and the REMARKS Column indicates: M8 X 25 (HS, HEAD MARKED 10.9)?GREAT ! :thumbsup:

With that information and my handy-dandy Metric Bolt and Cap Screw Torque reference (attached) , the Torque Value should be 23.5 ft-lb Lubricated or 29.5 ft-lb Dry?. BETTER YET, PRETTY SIMPLE ! :thumbsup:

Just when I thought everything was peachy keen I noticed a small detail, the (2) Flange Bolt Hex Heads in question were marked with "7" (picture attached)

So off I went through the forums and found your thread with the handy-dandy reference guide for Japanese Standards (BoltTorquesFor_7Tand9T_Bolts) attached. I found the "7" hex head marking column and HUH ? Torque indicates "17.4-20.2 lbf-ft" and so I'm reaching for an answer, is the John Deere Replacement Part to the same spec the Yanmar "7" Bolt was made to.........


ANY SUGGESTION WOULD BE APPRECIATED THANKS...........

 

[RoyJackson]

I think the torque values in red bolded font should be Newton-Meters, not ft-lbs. Suggest you reread the columm headers of the conversion chart and I think you'll see what I mean.

Kco,

I feel a Primal Scream Building Those Sten-ken Bolts !!:shocked:

I recently purchased an '04 JD 790, it has a Yanmar Engine MODEL: 3TNV82A-LJNT (so-far-so-good). Since I've just completed all the fluid and filter changes I thought I'd tackle the Thermostat remove and replace task. :cool2:

The on-line JD Parts Catalog excerpt (attached) you'll see PN: 19M7867 (Key # 6) for (2) Bolts attaching the COVER to the top of the water pump assembly. There's usually some additional information in the REMARKs Column like the diameter and length, this time however nothing.

So off to the internet search and I found a JD1200A (attached) using the same PN (Key # 7) and the REMARKS Column indicates: M8 X 25 (HS, HEAD MARKED 10.9)?GREAT ! :thumbsup:

With that information and my handy-dandy Metric Bolt and Cap Screw Torque reference (attached) , the Torque Value should be 23.5 ft-lb Lubricated or 29.5 ft-lb Dry?. BETTER YET, PRETTY SIMPLE ! :thumbsup:

Just when I thought everything was peachy keen I noticed a small detail, the (2) Flange Bolt Hex Heads in question were marked with "7" (picture attached)

So off I went through the forums and found your thread with the handy-dandy reference guide for Japanese Standards (BoltTorquesFor_7Tand9T_Bolts) attached. I found the "7" hex head marking column and HUH ? Torque indicates "17.4-20.2 lbf-ft" and so I'm reaching for an answer, is the John Deere Replacement Part to the same spec the Yanmar "7" Bolt was made to.........


ANY SUGGESTION WOULD BE APPRECIATED THANKS...........

 

[sriddle1ny]

Hey Roy, You're up already..........

I see I forgot to include the handy-dandy reference, sorry about that............

 

[RoyJackson]

Hey Roy, You're up already..........

I see I forgot to include the handy-dandy reference, sorry about that............

Actually, got home from work about an hour ago...

Do some more research...although there appears to be a contradiction, I don't think there is.
One chart is listing a minimum torque spec, the other a maximum. Also, the bolt coating and/or alloy can have a different recommended torque. When you do your research, you'll see more values for a given size.

Here's another chart, BTW. Metric fasteners are about halfway down the chart.

 

[John_in_TN]

I may have missed your reason for not using the originally spec'd JD part number, but when I search for that p/n on JD Parts I find the following info which includes specs and my local store has 31 in stock for $0.65 each:

Part Details

Part Number:

19M7867
Part Price:0.65 USD
On Hand:

31 Check Other Stores
Description:SCREW, FLANGED, METRIC
All Makes Parts from John Deere Where Used

EnglishMetric

Specification
Weight0.02 LBS 0.01 Kg
Thread Size0.315 IN
Thread Pitch0.049 IN
Length0.984 IN
Thread Length0.837 IN
Flange Diameter0.709 IN
Head Height0.319 IN
Material or Grade10.9
Drive Size0.512 IN
Finish B Note

Part Diagram

 

[RoyJackson]

I may have missed your reason for not using the originally spec'd JD part number, but when I search for that p/n on JD Parts I find the following info which includes specs and my local store has 31 in stock for $0.65 each:

There were three engines used in the 790 during it's production run...the bolt sriddle1ny specified may have been the one spec'd for his engine.

I suspect the one you quoted is for the current engine.

 

[John_in_TN]

Roy, according to his (sriddle1ny) post he identified 19M7867 as the correct part from JD Pars online for his application, but because he didn't find the specs for that p/n, he searched online and found a second p/n. It wasn't clear to me why he abandoned the original p/n.
I was just trying to point out that JD Parts does give the specs for 19M7867 and it appears to be available from JD.

"The on-line JD Parts Catalog excerpt (attached) you'll see PN: 19M7867 (Key # 6) for (2) Bolts attaching the COVER to the top of the water pump assembly. There's usually some additional information in the REMARKs Column like the diameter and length, this time however nothing. "

 

[RoyJackson]

Roy, according to his (sriddle1ny) post he identified 19M7867 as the correct part from JD Pars online for his application, but because he didn't find the specs for that p/n, he searched online and found a second p/n. It wasn't clear to me why he abandoned the original p/n.
I was just trying to point out that JD Parts does give the specs for 19M7867 and it appears to be available from JD.

"The on-line JD Parts Catalog excerpt (attached) you'll see PN: 19M7867 (Key # 6) for (2) Bolts attaching the COVER to the top of the water pump assembly. There's usually some additional information in the REMARKs Column like the diameter and length, this time however nothing. "

I'll take your word on that.