AI NEEDbattery CHARGER 4400cl FREECLIMBER

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Chances are the right hand clutch sprocket is failing. You can replace just the right hand side or the whole drive hub assembly. I usually find if the right hand side is gone, the left hand side is not too far behind. I will provide a link for the product I am referencing. Drive Hub for Stairmaster Steppers 4000PT 4400CL 4600CL 4400PT 4600PT...

The power inlet is located on the users left hand side at the very bottom of the lower side panel. The link below will take you to our Website. You will be able to access the diagram, users manual and the owners manual. Stairmaster Stepper 4400CL Parts Spring Chain Battery SPORTSMITH net

The link below is to a troubleshooting video that will help resolve your issue.

Resistance Troubleshooting Video for Stairmaster Stepper 4400CL 4600CL...
Troubleshooting No Resistance on Stairmaster Stepper 4400CL and 4600CL

Resistance Troubleshooting Video for Stairmaster Stepper 4400CL 4600CL...

This may be the cause of a worn clutch sprocket. You can see this part and other troubleshooting information on our Website.
Drive Hub for Stairmaster Steppers 4000PT 4400CL 4600CL 4400PT 4600PT...

The following link will take you to the console codes that allow you to program information according to your desires.
Stairmaster 4400CL and 4600CL Console Codes Customize Diagnostic

There are several types of grease that can be used for this machine. You can use a lithium grease on the hub and a 30 WT motor oil on the chains.

Super Lube with Teflon 16 Oz Jar SPORTSMITH net

I would start with checking your brushes in your alternator. If they are worn down, they will not make good contact. The resistance in this machine is provided by the alternator.

Testing Alternator of Stairmaster Steppers 4400CL 4600CL SC916

You first start @ the beginning by check you power source here is a web page that would give step by step procedures start with the electrical trouble shooting then work your way down the 4400 & 4600 are the same in many aspect of function.
http://www.gympart.com/index.asp?fn=/troubleshooter_bank/stairmaster/steppers/sm4400/troubleshooting