Crank And Bottom Bracket Assembly - Stairmaster MOMENTUM C40 Owner's Manual

PARTS REMOVAL AND REPLACEMENT
3. Apply a small amount of multi-purpose grease to the threads of the
pedal spindle before reinstalling the pedals on the crank.

CRANK AND BOTTOM BRACKET ASSEMBLY

1. Remove the side covers.
2. Remove the HTD belt.
3. Remove the left pedal.
4. Loosen and remove the bottom bracket jam nut located on the left
side of the crank. This nut has reverse threads; loosen it by turning it
clockwise.
5. Remove the round, metal crank shield and the spacer from the left side
of the crank.
6. The left bearing nut assembly can be removed from the crank with a
15-mm cone wrench. This nut has reverse threads; loosen and
remove it by turning it clockwise.
7. Slide the crank out of the frame to the right.
8. The right bearing nut assembly can be removed from the crank with a
32-mm cone wrench.
9. Inspect the bearings for smoothness of operation. Replace the
bearings if necessary.
10. Ensure that the right bearing nut assembly is tight against the
large HTD pulley before reinstalling the crank into the frame. The
outside edge of the bearing nut assembly should be flush with edge of
the main frame (bottom bracket) when the crank is installed.
11. Install the left bearing nut assembly onto the crank and tighten it so
the outside edge of the bearing nut assembly is flush with the bottom
bracket. Do not overtighten the nut; the crank should spin freely.
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