Life Fitness Lifecycle 3500 Series, Service Manual

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6
Lifecycle 3500, 4500, 5500 Series 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
TIGHTEN.
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.