Ultra motor A2B Metro, Service Manual

Page: 35 / 48

5-7
CHAIN and CRANKSET
Installation
NOTE
The bottom-bracket cartridge has very
fine threads. These can be easily dam-
aged. Check the threads in the bottom-
bracket shell before installation. Dress the
threads as necessary.
1. Apply grease to the threads of the car-
tridge main body.
NOTE
The main body uses left-hand threads. Turn
the cartridge counterclockwise to install it.
2. Carefully threads the cartridge into the
right side of the bottom-bracket shell. Turn
the main body counterclockwise (
Figure
17 ) until the cartridge is snug in the bottom-
bracket shell.
3. Apply grease to the threads of the
adapter ring.
4. Carefully thread the adapter ring into
the left side of the bottom-bracket shell.
5. Install the bottom-bracket-cartridge tool,
and torque the bottom-bracket adapter
ring to the specification in Table 5.
The adapter ring on this cartridge has stan-
dard right-hand threads. The main body,
however, has left-hand threads.
A bottom-bracket-cartridge tool (Park
Tool BBT-2) is required for removing and
installing the bottom-bracket cartridge.
Removal
1. Remove both crank arms.
2. Install the bottom-bracket cartridge tool
onto the adapter ring, and remove the
ring from the left side of the bottom-brack-
et shell.
NOTE
The main body of the cartridge has left-
hand thread. Turn the cartridge clockwise
to remove it.
3. Install the bottom-bracket cartridge tool
onto the cartridge main body, and remove
the cartridge from the right side of the bot-
tom bracket (
Figure 17 ).
FIG. 17