Ultra motor A2B Metro, Service Manual

Page: 33 / 48

5-5
CHAIN and CRANKSET
Installation
1. Fit the chainring onto the spokes (spider)
so the chainring mounting holes align with
the holes on the spokes.
2. Position the chainring so the cutout with
the tab (B,
Figure 14
) aligns with the crank
arm.
3. Apply oil to the threads of the chainring
bolts.
4. Fit a nut (C,
Figure 14 ) into the inboard
side of the chainring, and turn in a chainring
bolt (B,
Figure 9 ). Repeat until all bolts are
turned in.
5. Evenly tighten the chainring bolts in a
crisscross pattern. Torque each bolt to the
specification in Table 5.
Chainring Wobble Check
When installing a new right crank arm or
reinstalling a right crank arm with a new
chainring, the crank arm must be installed
in the position that produces the least
amount of chainring wobble. Perform the
following to determine that position.
1. Place a reference mark in one corner of
the end of right spindle.
2. Rotate the spindle so this reference mark
sits at 12 o’clock.
3. Fit the right crank arm onto the spindle
so the arm points to 6 o’clock.
4. Strike the arm with a plastic mallet so the
arm is securely seated on the spindle.
5. Rest a hand against the frame down
tube. Lightly touch the inside of the
chainring with the end of a forefinger
(
Figure 15 ).
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,
align the indexing marks (
Figure 10
) made
during removal. 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 mal-
let.
4. Apply grease to the crank arm bolt. Turn
in the bolt, and torque crank arm bolt (A,
Figure 9 ) to the specification in Table 5.
5. Repeat for the left crank arm if neces-
sary. 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 (B,
Figure 14 ). The
chainring must be mounted in this position
during installation.
3. Use a screwdriver to hold the chainring
nuts (C,
Figure 14
), remove the chainring
bolts (B, Figure 9 ), and remove the chainring
from the crank arm.
FIG. 14
A
B
C