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Page 49
TROUBLESHOOTING THE DRIVE TRAIN
3. Check the condition of the alternator.
a. Unplug the alternator from the relay board and remove the Poly-V
belt.
b. Spin the alternator pulley with your fingers. It should spin freely and
remain spinning for at least one and one-half revolutions. If it does
not spin as it should, the bearings may be bad and the alternator
should be replaced.
c. If the pulley does spin freely, check the alternator for noise,
roughness, or the presence of black powder inside the alternator or
near the outside of the case. If any of these conditions exist, the
brushes may be bad and the alternator should be replaced.
d. Reconnect the Poly-V belt and adjust the belt tension.
4. Check the drive chain mechanism. Rotate the stairs and look for chain
links that do not flex as the chain travels over the sprockets. If the links are
frozen or sticking, replace the chain.
5. Check the transmission.
a. Rotate the steps by hand and listen for the noise.
b. If you hear the noise, remove the drive chain and the Poly-V belt.
Rotate the steps by hand again and listen for the noise. If the noise
has gone away, replace the transmission.
6. Check the step chain assemblies.
a. Have your assistant slowly exercise on the machine. Observe the
staircase. If the staircase moves to the left or right during exercise,
ensure the set screws in the bearing adjusters are tight.
b. Rotate the stairs and look for chain links that do not flex as the chain
travels over the sprockets. If the links are frozen or sticking, replace
the chain.