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Old 09-18-06, 08:14 PM   #1
mikejo
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XT Cranks (760) Question

I just purchased a pair of XT 760 cranks off eBay and the PDF file from Shimano says to "push in a stopper plate and then tighten bolts" for the non-drive side crank arm. I cannot find this "stopper plate" and I am unclear what it is for from the PDF instructions. I have a 68mm that I assume is the "Band Type" since I don't recognize the "Bracket Type" also on the instructions. The washer set up looks simple enough, however mine came with three black washers that I think are the 2.5mm but I'm not sure. The instructions have three different thicknessess and all I have is three of the one thickness.
Anyone help me out here? Trying to get my new frame built up in the near future.
Plus, how important is correct torque? I've never used any sort of torqe wrench before and never had any problems, but I'm thinking that may not be such a good idea with my new build.
Thanks
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Old 09-19-06, 10:45 AM   #2
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If you look at the slot on the non-drive side crank arm that the fixing bolts go through, there should be a black metal plate. It has a hole on one end that one of the fixing bolts goes through. the other end has a hook that should fit around the other fixing bolt. There is a small pin you can't easily see on the spindle side of the stopping plate. Before putting the crank arm on or taking it off, you have to use something thin to pull the stopping plate up so it protrudes above the slot it's in. If you look at the spindle, there is a small hole in it. When the crank arm is installed, you push the stopper plate down into its slot so its below the surface of the crank arm. In doing so, the small pin on the stopper plate engages the small hole in the spindle. I believe this is intended to keep the the crank arm on the spindle should the fixing bolts and the end cap come loose.

You can figure all this out by looking closely at the install instructions for the crank and crank arm. There is a drawing that shows the plate, the pin and the hole in the spindle and how they fit together when everything is installed correctly.
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Old 09-19-06, 10:57 AM   #3
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Originally Posted by Proximo
If you look at the slot on the non-drive side crank arm that the fixing bolts go through, there should be a black metal plate. It has a hole on one end that one of the fixing bolts goes through. the other end has a hook that should fit around the other fixing bolt. There is a small pin you can't easily see on the spindle side of the stopping plate. Before putting the crank arm on or taking it off, you have to use something thin to pull the stopping plate up so it protrudes above the slot it's in. If you look at the spindle, there is a small hole in it. When the crank arm is installed, you push the stopper plate down into its slot so its below the surface of the crank arm. In doing so, the small pin on the stopper plate engages the small hole in the spindle. I believe this is intended to keep the the crank arm on the spindle should the fixing bolts and the end cap come loose.

You can figure all this out by looking closely at the install instructions for the crank and crank arm. There is a drawing that shows the plate, the pin and the hole in the spindle and how they fit together when everything is installed correctly.
Thank you. I do not have that piece. Someone told me Shimano introduced that piece in the later 760 cranks and that earlier ones do not have it. I'm trying to figure out if I really need it and if it should have been included in my "new" cranks purchased on eBay.
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Old 09-19-06, 11:36 AM   #4
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Look to see if there is a hole in the spindle. If not, you wouldn't have the stopper plate.

I have a Ultegra 6602 Hollowtech II crankset here that doesn't have the stopper plate so it's not unusual. I suspect it's a "lawyer" feature anyway.
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Old 09-19-06, 12:36 PM   #5
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Right! The plate was discontinued as a standard parts with the Shimano HollowTech II chainsets as so many people apparently didn't bother fitting it. It's not necessary, and serves only to prevent over-tightning and deformation of the crank-axle interface, according to Shimano UK.

The first shipment has the stopper plate and a selection of washer sizes. Then they realised that making 2.5mm out of 1 1mm and 1 1.5mm, which everyone was going to have to do anyway, was pointless, so they just ship you three 2.5mm now.
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Old 09-19-06, 01:54 PM   #6
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I have installed a 760 crankset w/supplied parts like yours. Drive + non-drive crank, BB in 2 pieces, 3 identical spacers and 1 dust cap.

The instructions that came with mine matched the supplied parts; I didn't realize the Shimano website has instructions for a different revision of the crankset.

I have a torque wrench but didn't use it for the crankset install; mainly because I didn't purchase the ext bb wrench adapter. Don't know what effect it'll have.
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Old 09-19-06, 02:21 PM   #7
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It's almost impossible to apply more than the recommended 15-21lb/ft to the crank-arm locking bolts anyway, so the effect of not fitting those not-supplied spacers is fairly minimal.
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Old 09-20-06, 12:10 AM   #8
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Originally Posted by Falanx
Right! The plate was discontinued as a standard parts with the Shimano HollowTech II chainsets as so many people apparently didn't bother fitting it. It's not necessary, and serves only to prevent over-tightning and deformation of the crank-axle interface, according to Shimano UK.

The first shipment has the stopper plate and a selection of washer sizes. Then they realised that making 2.5mm out of 1 1mm and 1 1.5mm, which everyone was going to have to do anyway, was pointless, so they just ship you three 2.5mm now.
Wow! Thanks again Falanx. I recall your post a couple months ago on frame material (scandium). I ended up buying a Kelly for a great deal since he is going out of business. Now in the process of building it up.
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Old 09-20-06, 05:42 AM   #9
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Quote:
Originally Posted by Falanx
It's almost impossible to apply more than the recommended 15-21lb/ft to the crank-arm locking bolts anyway, so the effect of not fitting those not-supplied spacers is fairly minimal.
I'm assuming you are talking about the pinch bolts....

I could be wrong, but off the top of my head that seems a bit high. I thought the reccommended was around 100-120 in/lbs. I always use my torque wrench on these - looks like it may in fact be needed.
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Old 09-20-06, 10:54 AM   #10
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I've been known to be wrong when recalling the figures on Shimano installation instructions////
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Old 09-20-06, 01:55 PM   #11
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Sorry for this off-topic question, but mikejo, do you need to reface the BB mount on the Kelly? I'm interested in their frame. Thanks!
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Old 09-20-06, 02:53 PM   #12
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Originally Posted by Falanx
I've been known to be wrong when recalling the figures on Shimano installation instructions////
speeka the deutch??

It's 106-132 in/lbs.... I've got a cutout hanging here over my becnh
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Old 09-20-06, 05:02 PM   #13
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Sorry for this off-topic question, but mikejo, do you need to reface the BB mount on the Kelly? I'm interested in their frame. Thanks!
I don't think so. I recall on the website that the frame is ready to go except for treating the inside with something? I don't know what to do about that yet.
He only has 5 frames left, so if you are thinking a new Kelly, better act fast.
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