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Old 07-28-07, 02:42 PM   #1
kmart
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Pedal missing a bearing ball. Fix it or leave it?

I have Dura Ace PD-7750 pedals. I got them used so I don't know their complete history. When they arrived, I noticed that the right pedal makes a light clicking sound when it first turns one way or the other. To me it's obviously missing a bearing ball or two. It turns very smooth, but I wonder if I should open it up and add the missing ball back in (or just replace all of them as a set).

My main problem is that I don't know exactly what the right amount of balls is without taking apart the good pedal (the left one) and counting. According to the parts lits below Shimano's exploded diagram, there are a total of 62 steel 3/32" balls for both pedals (31 each pedal). However on the actual picture I count two bearings, one with 9 balls and the other with 17. That leaves 5 balls unaccounted for. Are those just spares or is the drawing not meant to be accurate down to the exact number of bearing balls?

EDIT: Link to exploded diagram (pdf)
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Old 07-28-07, 02:47 PM   #2
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When you have the correct amount of bearings in a race, it should look like it's missing 1 or 2. It should NEVER be jammed full in there.

Is this the case?

At any rate, it's moot. If you actually do need to replace a missing bearing or two, you need to buy the whole set and get rid of all the old ones. Mixing and matching bearings from different batches is not good.
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Old 07-28-07, 02:53 PM   #3
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Yes, I realize that the race is not supposed to be jammed full of balls. I haven't taken it apart to look (I don't have a proper pedal wrench...), but it's strange that the right pedal makes the light clicking sound and the left one doesn't.
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Old 07-28-07, 03:02 PM   #4
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I would trust the parts list vs the diagram.
They may have just "copied & pasted" a generic view of a bunch of ball bearings.

How do you know for sure it's missing a ball?
Besides, you don't want to mix new bb's from a different lot with old bb's.
If you are suspect about the bb's, just order a "bag" of new bb's and replace/grease all of them. They aren't that expensive!
Example-
http://www.loosescrews.com/index.cgi...d=492621418949
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Old 07-28-07, 03:11 PM   #5
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The clicking of ball bearings is usually indicative of little or no lubrication, unless your are of the "just a few drops of oil will do it" school. If you can open it up and it's clean a squeeze of grease will cure the click. If you overhaul, never replace one or a few bearings, always the full set.
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Old 07-28-07, 03:38 PM   #6
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Quote:
Originally Posted by kmart View Post
Yes, I realize that the race is not supposed to be jammed full of balls. I haven't taken it apart to look (I don't have a proper pedal wrench...), but it's strange that the right pedal makes the light clicking sound and the left one doesn't.
Are you SURE it's the pedal? Clicking sounds can be from anywhere on your bike. Anywhere.
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Old 07-28-07, 04:05 PM   #7
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Yes, I'm sure it's the pedal. I tested it before I put it on the bike, just spinning the axle in my hand - same sound.

I understand that bearings need to be replaced as a set. And yeah, looking at that site they are cheap! Might as well go ceramic

The low grease thing is a good point. The original owner could have been the "buy expensive toy, use until it falls apart, buy replacement toy" type, so "grease" was not a part of his vocabulary.

I guess the next step is to get a pedal wrench and some good quality grease. Thanks for the advice.
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