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1987 Shimano U-Brake how to load spring?
I use my 1987 Diamondback Arrival for a commuter. The Shimano U-brake,
mounted to the chainstays, gets pretty nasty towards the end of winter (year after year) and today one of the brake arms decided to freeze up on its pivot post. So I disassembled it, and got it all working again - almost. Unfortunately, I cannot figure out how to reassemble the spring, metal keeper (with guide hole) and plastic cap into the brake arm. If the spring has any tension, the metal cap rides on the cast buttress on the brake arm so there is not room to get the plastic cap on. The trick on how to do this eludes me - anybody remember how to reassemble these? TIA Steve |
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1987 Shimano U-Brake how to load spring?
On 13 Mar 2006 22:52:26 -0800, "Steve" wrote:
I use my 1987 Diamondback Arrival for a commuter. The Shimano U-brake, mounted to the chainstays, gets pretty nasty towards the end of winter (year after year) and today one of the brake arms decided to freeze up on its pivot post. So I disassembled it, and got it all working again - almost. Unfortunately, I cannot figure out how to reassemble the spring, metal keeper (with guide hole) and plastic cap into the brake arm. If the spring has any tension, the metal cap rides on the cast buttress on the brake arm so there is not room to get the plastic cap on. The trick on how to do this eludes me - anybody remember how to reassemble these? TIA Steve Barnett's Manual has exploded drawings of Shimano and Dia-Compe U-brakes. There was a time you could find this manual on line. Direct ranscription from the pdf version of Barnett's Manual - Chapter 36, page 40: Assembling Shimano-type U-brake 1. Grease springs 2. Install gold spring in arm without pinch bolt. Long end should be pointing out and should be winding in clockwise direction. 3. Install silver spring in the arm with pinch bolt. Long end should be pointing out and should be winding in counterclockwise direction. 4. Install tension plates with Allen fitting face out, with end of spring in hole in plate. 5. Plate on gold spring should be wound clockwise about 60 degrees, until tab on perimeter of plate is past stop inside arm. Then, press in firmly on tension plate with Allen wrench seat it in arm. 6. Plate on silver spring should be wound counterclockwise about 60 degrees, until tab on perimeter of plate is past stop inside arm. Then, press in firmly on tension plate with Allen wrench seat it in arm. 7. Place dustcap(s) over tension plate so protruding spring will engage slot in back of dust cap, and so two notches in back perimeter of dust cap line up with stop tabs inside arm(s). ------ There's also the library which should have a selection of, now rather dated, bicycle repair books with a drawing. HTH My first encounter with U-brakes was a partially and incorrectly re-assembled one missing a bushing. Not fun until I got a book and the missing bushing. -- zk |
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