Stairmaster FreeClimber 4600 PT Owner's Manual page 58

MECHANICAL TROUBLESHOOTING
4. Remove the drive and step chains. Check the condition of the chains by
flexing each link up and down. Each link should move freely. Replace
the chain if any stiff or inflexible links are found or if the chain is rusty,
corroded or otherwise damaged. Do not reinstall the chains.
5. Remove the pedals. Clean any corrosion off the pedal shaft with an oil-
dampened rag. Apply a thin coat of multi-purpose grease to the shaft. If
the noise persists, go to step 6.
6. Check the step chain connection point. Clean and grease the master link
and bushing. Replace damaged parts.
7. Check the drive hub assembly.
• Check the condition of the drive sprocket teeth. The teeth should
not be unevenly worn. Replace the worn sprocket(s).
• The drive sprockets work independently of one another. Each
sprocket should turn freely in one direction and lock when turned in
the other direction. Replace an inoperable drive sprocket.
• Remove the drive shaft. Inspect the bearings in the drive hub.
Replace the drive hub assembly if the shaft does not spin freely or
if there is excessive radial play at the shaft. Be careful not to get
dirt into the hub.
• Inspect the ends of the drive shaft (at the sprocket attachment
points) for signs of wear or scoring. Replace the shaft if it is
excessively worn.
8. Check the pedal arm and leveling arm shafts by removing both the right
and left pedal and leveling arms. Inspect the shafts and the bushings for
signs of wear and corrosion. Replace the bushing(s) if worn.
• Clean all corrosion off the pedal arm shaft and leveling arm shaft
and bushings. Wipe the shafts with an oil-dampened cloth before
reassembling. DO NOT SAND THE PEDAL ARM SHAFT OR
LEVELING ARM SHAFT.
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