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6. Carefully turn the crank-wrench body onto the crank arm. finger-tighten the body until it bottoms in the
arm. Use an adjustable wrench to snug the body into the crank arm, and turn in the crank- wrench handle
(
Figure 5-6
).
FIGUrE 5-6
CAUTION
If the crank-wrench body rotates or if the body pulls from the crank arm when the crank wrench
is tighten, remove the crank- wrench body and identify the problem. The crank wrench threads
may be dam- aged. Correct the problem before proceeding.
7. If removing the right arm, remove the chain from the chainring.
8. turn the crank-wrench handle clockwise, and press the crank arm off the spindle.
Inspection
1. Inspect the spindle flats for signs of a loose or worn crank arm. If the crank-arm marks on the spindle flats
extend along the entire surface of the flats, the crank arm is worn. replace it.
2. Inspect the square hole in the crank arm (
Figure 5-7
). the flats of the hole should be straight and even.
replace the crank arm if its square hole shows signs of wear or damage.
FIGUrE 5-7
3. Inspect the crank arm for cracks or other signs of wear. pay particular attention to the area around the
mounting holes at either end of the crank arm. replace the crank arm if it is worn.
4. Inspect the spokes (spider arms) (
Figure 5-8
) on the right crank arm. replace the crank arm if any spoke
is cracked or shows signs of damage.
FIGUrE 5-8
Installation
When installing both crank arms, install the right crank arm first, and then install the left crank arm so it is
oriented 180 degrees from the right arm.
1. When installing a new right crank arm or a new chainring, check chainring wobble as described in this
chapter.
2. Use acetone or alcohol to clean the flats of the spindle.
3a. When reinstalling an old crank arm, line up the spindle to the crank arm hole. tap the crank arm onto the
spindle with a plastic mallet.
3b. If installing a new right crank arm and/ or new chainring, perform the following:
a. rotate the spindle so the reference mark from the chainring wobble test is at the position that produced
the least amount of wobble.
b. fit the chainring into the chain.
c. rotate the derailleur forward, and seat the crank arm onto the spindle so the arm sits at 6 o’clock.
d. tap the crank arm with a plastic mallet.
4. apply grease to the crank arm bolt. turn in the bolt, and torque crank arm bolt (
Figure 5-5
) to the
specification in table 5. 5. repeat for the left crank arm if necessary. make sure the left crank arm is 180
degrees opposite the right crank arm.
ChAINrING
removal
1. remove the right crank arm as described in this chapter.
2. Inspect the inboard side of the crank arm/chainring. note that the chainring is mounted so the cutout with
the tab aligns with the crank arm. the chainring must be mounted in this position during installation.
Installation
1. fit the chainring onto the crank arm in the same position as removal.
2. position the chainring so the cutout with the tab aligns with the crank arm.
3. apply oil to the threads of the chainring bolts.
4. fit the chain ring nut onto the inboard threads of the crank arm and tighten (according to table 5).
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