Stairmaster 4000 PT series, Owner'S Manual

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Page 51
PEDAL ARM RETURN SPRING
1. Remove the bottom cover.
2. Unhook the pedal arm return spring from the spring hanger.
3. Detach the spring from the step chain by removing the master link
(see Figure 11). The spring-chain connector is in good condition if it
has an hour glass shape. Replace a worn spring-chain connector.
4. Check to ensure that the spring pulley turns freely and is not worn
excessively. Refer to the “Spring Pulley” section if you have to replace
the pulley.
5. To reinstall the spring, connect it to the end of the step chain using
the master link.
6. Route the spring under the spring pulley.
7. Hook the end of the pedal arm return spring onto the spring hanger.
8. Reinstall the covers.
SPRING PULLEY
1. Remove the bottom cover.
2. Unhook the pedal arm return spring from the spring hanger.
3. Remove the snap ring from the pulley shaft.
PARTS REMOVAL AND REPLACEMENT
!
WARNING
DO NOT TWIST THE SPRING DURING INSTALLATION. IT WILL WEAR
EXCESSIVELY AND REDUCE THE LIFE OF THE SPRING.