Question about Stairmaster 4400 PT Stair Stepper
Works fine for 15-20 minutes then loses all resistance in steps.
try it then next day and it does the same thing. changed the alternator brushes, resistor, and diode but still have same problem, after 15-20 minutes of use.
Replacement Parts for Fitness Exercise Equipment at SPORTSMITH
This sounds like an issue with the console. It is almost like a software glitch in the programming. Before focusing on the console as the culprit, you can check the wiring leading up to the console for good continuity just to make sure the wiring isn't the issue. I will attach a link to a video on using a multimeter to assist in checking the wiring.
Video about Multimeter Testing
Posted on Jan 29, 2016
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Posted on Jan 02, 2017
http://support.nautilus.com/support/stairmaster.jsp?lid=StairMaster you can download and view all manuals here. If by drive sprocket you mean the hub that both step chains go over.....replace the entire hub. faster easier and less hassle. cost difference is about 40 dollars.
Posted on Sep 01, 2009
SOURCE: stairmaster 4000 crazy console
Check all connections from power source in inside the cover where alternator is to upper display then if the problem still continues I suspect your upper console is going south. Call National Gym Supply @ 1-800-496-7278 they can either repair it or may have a exchange board for you.
Posted on Mar 13, 2010
If the upper display is not give any commands for weight ,desired program and time, if these are not inputed then the resistance is high
Posted on May 15, 2010
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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