Stairmaster 4200 PT, 4600 PT/CL, 4400 PT/CL manual Mechanical Troubleshooting

MECHANICAL TROUBLESHOOTING

•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.

9.Remove the HTD belt. Inspect the belt, the Poly-V pulley, and the HTD pulley for excessive wear. Replace if necessary. The Poly-V pulley should spin freely. If it does not, replace the eccentric shaft assembly.

10.Inspect the HTD pulley for excessive wear and smoothness of operation. If the pulley is worn, replace it. If it does not spin freely, remove the first reduction shaft and inspect the bearings.

11.Reinstall all parts, ensuring the proper tension of the Poly-V and HTD belts and the drive chain (see Figure 30). Clean and lubricate the drive and step chains with 30W motor oil before reinstalling them.

Page 55