Life Fitness exercise bikes User Manual

Lifecycle Exercise Bikes

How To...REMOVE THE EXISTING CRANK BEARING/NUT ASSEMBLIES

Tools Required: Special crank arm wrench required (available from Life Fitness), torque wrench (30 FT. LB. with

32mm open end), punch, standard screwdriver, hex key wrench set, clean rag

Warning: If the information in these instructions are not followed exactly, the exercise bike may be

seriously damaged and may void your warranty. To insure proper installation, service by a Life Fitness

authorized service representative is strongly recommended.

Step 1

Remove the exercise bike PEDALS and HOUSING.

Step 2

Remove the CHAIN or DRIVE BELT, depending on model.

Step 3

With a standard screwdriver, remove the three
SPROCKET DUST COVER SCREWS (if so equipped).
Guide the SPROCKET DUST COVER off of the CRANK
ARM.
Step 4 (Figure 1)
Using a 5/32” hex key wrench, remove the two BEARING
CLAMP BOLTS, two LOCKWASHERS and four BEARING
CLAMPS from the bike frame. Discard the two BEARING

CLAMP BOLTS, two SPLIT LOCKWASHERS and the
four BEARING CLAMPS as they are not to be re-used.

Step 5 (Figure 2)
Bend the outward tab of the TAB LOCK WASHER to allow rotation of
the REVERSE THREADED LOCK NUT. Using the 32mm crank arm
wrench, loosen and remove the REVERSE THREADED LOCK NUT.

Remember, this NUT is REVERSE THREADED.

NOTE: NUTS ON THE LEFT SIDE ARE REVERSE THREADED, i.e.,

CLOCKWISE TO LOOSEN AND COUNTER-CLOCKWISE TO

Step 6 (Figure 3)
Remove the TAB LOCK WASHER off the inside CRANK NUT on the
left side of the bike. Discard the TAB LOCK WASHER as it is not to

be re-used.

Step 7

With the 32mm crank arm
wrench, loosen and remove
the left side REVERSE
THREADED CRANK
BEARING/NUT ASSEMBLY
by sliding it over the CRANK
ARM.
Step 8 (Figure 4)
Remove the CRANK ARM
from the CRANK TUBE by

tilting it from its vertical
position to a horizontal position. Guide the CRANK ARM through the
CRANK TUBE until it has been completely removed from the left side of
the the bike to the right side.

Step 9

With the special 32mm crank arm wrench, loosen and remove the right
CRANK BEARING/NUT ASSEMBLY from the CRANK ARM.

TIGHTEN.

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Lifecycle Exercise Bikes

How To...INSTALL THE NEW CRANK BEARING/NUT ASSEMBLIES

Step 10

Slide the right CRANK BEARING/NUT ASSEMBLY over the
CRANK ARM. Using the 32mm crank arm wrench, install the
BEARING CRANK NUT ASSEMBLY until it seats against the
SPROCKET. Tighten to 20-30 FT. LB. seating torque.

Step 11

Using a clean rag, wipe all accummulated dirt and residue from
the CRANK TUBE.
Step 12 (Figure 5)
Guide the CRANK ARM through the CRANK TUBE by tilting it
from a horizontal position to a vertical position until it has been
completely inserted from the right side of the the bike to the left
side.

Step 13

Slide the left side REVERSE THREADED CRANK
BEARING/NUT ASSEMBLY over the CRANK ARM and align
into position. Begin to thread the CRANK BEARING/NUT
ASSEMBLY and follow this three step procedure using a torque
wrench:

• Tighten to 9-12 FT. LB. seating torque

• Back off the BEARING CRANK NUT to a loosened state

• Retorque to 4 FT. LB. ± 10%

Step 14 (Figure 6)
Slide the new TAB LOCK WASHER over the CRANK ARM with the
bent tab facing toward the bike FRAME. Slide the key of the TAB
LOCK WASHER through the notch and into position against the
CRANK BEARING/NUT ASSEMBLY. Align the flat of the bent TAB
against the flat of the NUT as shown in the diagram.

Step 15

Slide the REVERSE THREADED LOCK NUT over the CRANK
ARM, thread it into position and with the 32mm crank arm
wrench, tighten the REVERSE THREADED LOCK NUT to 4

FT. LB. ± 10% against the TAB LOCK WASHER. Remember,
this NUT is REVERSE THREADED. Bend the straight tab of

the TAB LOCK WASHER so the flat of the TAB is against the
flat of the LOCK NUT, then bend the inner tab of the TAB
LOCKWASHER until it is flush against the flat of the inner
CRANK BEARING NUT.
Step 16 (Figure 7)
Using a 5/32” hex key wrench, loosely install the two new

SPLIT LOCKWASHERS, two new BEARING CLAMP BOLTS
and the four new BEARING CLAMPS against the bike frame to secure the outer races of the CRANK
BEARING/NUT ASSEMBLIES in place. Tighten the two new BEARING CLAMP BOLTS to 4-5 FT. LB. seating

torque.

NOTE: The BEARING CLAMP BOLTS are treated with a special epoxy and must be used only once.

Step 17

Re-install the DRIVE BELT (or CHAIN), the SHROUD and replace the PEDALS onto the exercise bike.

The installation is now complete.

M051-00K20-B009

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