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D17 Hitch Bolt Size
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d17wd45 View Drop Down
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Joined: 08 Dec 2012
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote d17wd45 Quote  Post ReplyReply Direct Link To This Post Topic: D17 Hitch Bolt Size
    Posted: 20 Jun 2022 at 9:24am
D17 Series III - Needing to know the bolt size for the two bolts that holds the plate to the housing for connection of the drawbar.  The plate has the PINS the drawbar slides on the tractor.  Have attach a picture.   Thanks for any help.  
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22166 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 11:18am
I going to say they are 3/4" NC diameter by 2 1/2" long- grade 8 quality and use a hard flatwasher, not a lock washer.  The length is a guess on my part but close. They need to be TIGHT or they will work loose.
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Points: 11784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TramwayGuy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 1:34pm
“….3/4" NC diameter by 2 1/2" long- grade 8 quality and use a hard flatwasher, not a lock washer. ”

Grade 8 is probably overkill, as the material you are screwing it into is cast iron or cast steel. Tightening a grade 8 bolt enough to stretch it properly would maybe strip out the housing.

I agree with not using a lock washer.   But I would use loctite on those capscrews rather than trying to torque to a grade 8 spec. Go to about 200 lb-ft for a 3/4” screw with loctite.
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Alvin M View Drop Down
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Points: 806 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Alvin M Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 2:26pm
After s # 24001 they used studs lock tight them in much better the bolts
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Points: 3989 		Post Options Post Options   Thanks (0) Thanks(0)   Quote plummerscarin Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 3:25pm
Originally posted by TramwayGuy TramwayGuy wrote:

“….3/4" NC diameter by 2 1/2" long- grade 8 quality and use a hard flatwasher, not a lock washer. ”

Grade 8 is probably overkill, as the material you are screwing it into is cast iron or cast steel. Tightening a grade 8 bolt enough to stretch it properly would maybe strip out the housing.

I agree with not using a lock washer.   But I would use loctite on those capscrews rather than trying to torque to a grade 8 spec. Go to about 200 lb-ft for a 3/4” screw with loctite.

Curious here. Are you saying that the bolt must be under tension to achieve its full strength?
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MACK View Drop Down
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Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 9:05pm
The way it is made, I would say you need to retorque the bolts every time you use it.                              MACK
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Points: 11784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TramwayGuy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 9:47pm
“Curious here. Are you saying that the bolt must be under tension to achieve its full strength?”

No, strength is not improved by stretching, but helps keep it from loosening.
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TramwayGuy View Drop Down
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Joined: 19 Jan 2010
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Points: 11784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TramwayGuy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jun 2022 at 9:49pm
“After s # 24001 they used studs lock tight them in much better than bolts..”

Agreed. Much less likely to strip the threads in the casting also.
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