Replacement Parts for Fitness Exercise Equipment at SPORTSMITH
You can take the covers off and see if it is indeed the chain that is slipping, but in most cases, the drive sprocket is actually what is failing. The following link will take you the item that should rectify your issue.
Drive Hub for Stairmaster Steppers 4000PT 4400CL 4600CL 4400PT 4600PT...
SOURCE: stairmaster freeclimber 4400pt how to fix slipping
This could be the hub assembly slipping I would replace this assembly and the pedal chains call National Gym Supply @ 800-496-7278 and get pricing for the hub assembly and step chain ( L & R )
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