Question about Stairmaster 4400 PT Stair Stepper

1 Answer

Stairmaster 4400pt loses all resistance after 15-20 minutes of us

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.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Stairmaster Master
  • 914 Answers

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

6 Suggested Answers

  • 1 Answer

SOURCE: Stairmaster 4400cl has two problems

you need a plug to charge it. it does have a battery

Posted on Jan 27, 2009

  • 49 Answers

SOURCE: STAIRMASTER 4600CL RIGHT PEDAL LOSES RESISTANCE AND SLIPS 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

  • 832 Answers

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

  • 832 Answers

SOURCE: I just changed the alternator and diode in my

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

  • 832 Answers

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 )

Posted on Jun 01, 2010

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:


Alternator Testing for 4400CL, 4600CL, and SC916 Steppers

The video demonstrates a unit with no resistance, the pedals fall to the floor. Checking that the alternator brushes are working properly is the recommended action. Tools Needed: 1/4" Nut Driver or Wrench
This is done by disconnecting the brown wire from the Field terminal of the alternator and the white wire from the B+ or POS terminal of the alternator. The wiring sticker should help you to identify the designated terminals. A jumper wire is needed to proceed with this test. (A jumper wire can be fashioned from wire with slip on connectors crimped to each end or the jumper can be a normal piece of wire with the coating stripped from each end. The designated terminals have a small hole that the stripped end of the wire can be threaded through to create the jumper.) Connect one end of the jumper wire to the B+ or POS terminal and the other end to the Field terminal. Step on the unit for about 10-15 seconds to verify resistance. If no resistance between the B+ or POS and Field, this normally indicates that the alternator brushes are worn or damaged.
Remove the jumper wire and then remove the alternator brushes for further inspection. Using the 1/4" driver or wrench, remove the two bolts from the brush cover. Once the bolts are removed, pull on the Field terminal to remove the alternator brushes.
Inspect the alternator brushes. The brushes should be smooth and free of cracks, nicks, and breaks. The brushes are spring loaded. Confirm when pressed that the brush will spring back to position. Replace the brushes if necessary.
When re-installing the alternator brushes to the alternator, the brushes will face down toward the inside of the alternator. (Due to the brushes being spring loaded, it may be necessary to press the brush into its housing for ease of installation and to avoid damaging the new brush.)
Test the unit after replacing the alternator brushes. Reconnect the jumper wire to the B+ or POS terminal and the Field terminal. Step onto the unit and verify resistance. In this example, the alternator brush replacement was all that was necessary to correct the resistance problem.
With resistance verified, it is time to remove the jumper wire and reconnect the white wire to the B+ or POS terminal and the brown wire to the Field terminal. Make sure all cables are connected (including the console cable) and this completes the alternator test

Testing Alternator of Stairmaster Steppers 4400CL 4600CL SC916

on Feb 25, 2015 | Stairmaster Exercise & Fitness


Jumper Test for Stairmaster Alternator

Video about Performing a Stairmaster Alternator Jumper Test

  • In today's video, we will be showing you how to verify your Stairmaster alternator is functioning correctly

    • The quickest way to determine if the alternator is the cause for your resistance issue is by performing what is called a jumper test

  • To do this test, unplug the power on a PT machine and Stepmill or unhook the battery on a CL (cordless) machine

    • Power remains disconnected for this test

  • Remove the right shroud from the unit

  • On back of alternator, locate the Field or FLD terminal

    • This wire is usually brown

  • Also, locate the terminal labeled Positive or B+

    • The wire connected to this could be white or black depending on model

  • Once you've located and disconnected the wires from these terminals, you will need a jumper wire to proceed

  • Hook one end of the jumper to the Field terminal and the other end to the B+ or Positive terminal

    • It is very important that the jumper makes a good connection at both ends

  • Once you have the jumper connected, proceed to step on the machine

    • You will have to step fast to keep up for about 10-20 seconds

  • After stepping on the unit, you will obtain full resistance if the alternator is working properly

  • If your alternator passes this test, yet you still have a loss of resistance, you will need to further troubleshoot

  • If you do not get resistance, than your alternator is the problem

    • The common solution is to replace your alternator brushes

      • First, make sure your jumper wire connection is good

      • If not, you may produce a false negative result

on Feb 11, 2015 | Stairmaster Exercise & Fitness

1 Answer

Will not recognize any progam

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

This really sounds like a resistance issue. This can be caused by worn alternator brushes or a bad alternator. The alternator provides the machines resistance. The following information is for checking the brushes and further troubleshooting information.

Jan 20, 2014 | Stairmaster 4400 PT Stair Stepper

1 Answer

Level starts at 19

About This Video

This video covers the electronic troubleshooting for a complaint of No Resistance on the Stairmaster Stepmill 916. Tools Needed: Multi Meter, Assistant for Testing Purposes
It is necessary to begin by removing the user's right side cover to gain access to lower control board and alternator for testing purposes.
  • Using your multi meter on the volts setting, you will place your black meter lead to the Ground test point on the lower board and place your red meter lead into the back of the cable connector where the brown wire is located. Have your assistant step onto the steps. Voltage should be present. If no voltage is present, check all cables. If cables check out, the console should be replaced. If voltage was present, it is time to move to the next test point.
  • Place your black meter lead to the Ground test point and the red meter lead to the Tach test point. Have your assistant step onto the steps. Voltage should be present. If no voltage is present, the alternator brushes should be replaced. If voltage was present, it is time to move to the next test point.
  • Next component to test for a no resistance issue is the load resistor. You will be testing for .5 -.7 ohms. Place the red meter lead to the white wire connected to the load resistor and the black meter lead to the black wire. If the proper value is not found when the load resistor is tested, it should be replaced.
You have now tested the entire electrical circuit. If the problem still exists, you have a mechanical failure or you should verify the results of your testing.

Jan 02, 2014 | Stairmaster Stepmill 7000 Pt

1 Answer

Stepmill sm916 loses tension on the steps

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

This sounds like you are experiencing worn alternator brushes. The following information should help in resolving this issue.

Nov 26, 2013 | StairMaster SM916 StepMill

1 Answer

I have a 440pt and the left pedal is skipping down to the floor about every 5 seconds. If the issue is the hub assemble, do I have to change out everything or can I just replace the bearing, etc...?

Why does one pedal drop on my Stairmaster Stepper but the other pedal operates correctly? Stairmaster Steppers, How to Troubleshoot when one Pedal Drops (Loses Resistance) while the Other Pedal Operates Correctly
  • If one pedal drops while the other operates correctly on your Stairmaster stepper, this problem commonly occurs when the drive sprocket on one side or the other becomes defective
  • Usually, when one drive sprocket fails, the other isn't too far behind
  • The best approach to resolve this problem is to install a new hub assembly

Why does one Pedal Drop on my Stairmaster Stepper

Sep 05, 2013 | Stairmaster 4400PT FreeClimber

1 Answer

Step has no resistance

Start by checking your alternator brushes. If they appear good, you can find other troubleshooting videos for your machine on our Website. Repair Parts for Stairmaster Equipment Batteries Springs Belts Chains...

Apr 04, 2013 | Stairmaster Stepmill 7000 Pt

1 Answer

Need owners manual for 4400pt

Stairmaster Stepper 4400PT Parts Chain Pedal Arm Fastener SPORTSMITH net

Click on the manuals tab in the middle of the screen. You will have access to the owners and service manuals.

Jan 21, 2013 | Stairmaster 4400PT FreeClimber

1 Answer

Stepmill has no resistance when starting

First thing you'll want to do is check the alternator brushes. Here's a link to the different types offered for the Stairmaster 7000PT:

Repair Parts for Stairmaster Equipment Batteries Springs Belts Chains...

If the brushes look like they are in good condition you can also test the relay board. This link will take you to the procedures for checking the relay board:

Stairmaster Stepmill 7000PT Electronic Testing of Relay Board

Nov 06, 2012 | Stairmaster Stepmill 7000 Pt

Not finding what you are looking for?
Stairmaster 4400 PT Stair Stepper Logo

Related Topics:

495 people viewed this question

Ask a Question

Usually answered in minutes!

Top Stairmaster Exercise & Fitness Experts

Sportsmith LLC
Sportsmith LLC

Level 3 Expert

914 Answers

Matt Olenzek
Matt Olenzek

Level 2 Expert

293 Answers


Level 3 Expert

5363 Answers

Are you a Stairmaster Exercise and Fitnes Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides