Question about Stairmaster 4400 PT Stair Stepper

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The chain slips when using the machine - both sides.

When the chain slips there is a loud noise, possibly indicating the chain has slipped and then caught again.

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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 )

Posted on Jun 01, 2010

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The chain feels like it is slipping and a clunking noise when it slips.

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1 Answer

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Stairmaster freeclimber 4400pt how to fix slipping chain. When using the machine the chain slips intermittently on both sides. Problem was infrequent in the beginning but getting worse all the time with...

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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Your rear sprocket is worn. As your put the pressure on the pedals the chain is riding over the teeth and makes a crunching sound. The teeth could appear slightly hooked. You will probably find this does not happen in a different gear. You need to replace both the cassette (rear sprocket assembly) and the chain together because the chain wears to match the sprocket and if you just replace one you will still get the slipping. The front chain ring also wears but at a much slower than the rear so check it as well. Also check the rear derailleur that it is tensioning the chain correctly and not damaged or if the bike is a single speed the rear wheel is positioned to give the correct chain tension.

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