Loud Noise from Exercise Bike During Exercise for LifeFitness 90C and 90CW

Probable Cause

A) Non-carpeted, hard surface floor
B) Improper riding style
C) Crank bearings worn
D) Alternator belt excessively loose
E) Alternator belt worn
F) Malfunctioning alternator
G) Drive belt excessively loose
H) Free-wheel pulley assembly

Corrective Action

A) Place Exercise Bike upon softer, surfaced floor.

B) Change style. Do not lean excessively to either side.

C) Inspect bearings. Replace as necessary.

D) Inspect belt deflection. Alternator belt deflection: 1/4 inch (6mm). Adjust as necessary.

E) Replace belt. Operate exercise bike as in normal use with light and heavy load levels. Listen for excessive noise.

F) Test Alternator output or, test with substitute Alternator. Alternator Voltage Test:
1. Attach DC voltmeter to Alternator. Voltmeter positive (+) probe to Alternator red lead. Volt meter negative (-) lead to Alternator black lead.
2. Maintain pedal speed greater than 45 RPM.
3. Press START key. Alternator Voltage Specification: 9 - 11 VDC when pedal speed greater than 45 RPM. Replace malfunctioning Alternator.

G) Inspect belt. Replace belt.

H) Inspect clutch for free rotation. Replace defective Freewheel Pulley assembly.

Items Discussed Above

  • Alternator | Mando with Studs Alternator | Mando with Studs
    Price: $210.83
    SS #: P01001700090841
  • Alternator Belt Alternator Belt
    Price: $7.95
    SS #: P01OK6310650000
  • Clutch Pulley with Bearing Clutch Pulley with Bearing
    Price: $45.00
    SS #: P01AK6300260000
  • Crankshaft and Bearings, LifeFitness Crankshaft and Bearings, LifeFitness
    Price: $49.00
    SS #: P01GK6300020077
  • Extech™ Volt-Amp Meter, AC/DC Extech™ Volt-Amp Meter, AC/DC
    Price: $139.99
    SS #: P0017C1212 | Item No Longer Available
  • Intermediate Shaft & Bearing Kit Intermediate Shaft & Bearing Kit
    Price: $75.00
    SS #: P01GK6300020007

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