Stairmaster Stratus Systems Owner's Manual page 41

MAINTENANCE INSTRUCTIONS
Quarterly Maintenance
1. Clean and thoroughly lubricate the drive chain and adjust the chain
tension every three months. Follow the chain removal and tensioning
procedures in the "Parts Removal and Replacement" section. Use a
degreaser to clean the accumulated grime from the chain. Lubricate
the chain with a spray-on chain lubricant such as Tri-Flow
installing the cover.
TO AVOID POSSIBLE BEARING FAILURE, DO NOT LUBRICATE THE SEALED
BEARINGS ON THE INTERMEDIATE SHAFT, OR THE CRANK. THEY ARE
LUBRICATED AT THE MANUFACTURING PLANT.
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