Why is the Precor AMT 100i Adaptive Motion Trainer Elliptical primary belt making noise and should I adjust it?

Question edited for clarity, 'make model (what it is)'.
Question moved from Cars and Trucks category.

Service Manual

https://www.google.com/search?q=Precor+AMT+100i+loss+of+resistance

It is a very complex machine.
..

Everything is fixable :>)

Service manual in the link

https://www.google.com/search?q=Precor+546i+Elliptical+Cross-Trainer+stuck+at+highest+position

..

Is very simple. Under the console or display, are some small cover , Press the small tab and you will 2 spring where is located the batteries.
Put some contacts cleaner for electronic, before to assemblies the batteries.
Blessing.
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Precor EFX 546 Version 1 Elliptical Trainer (Refurbished)

www.amazon.com > ... > Elliptical Trainers

Amazon.com, Inc.
Rating: 4.3 - ‎9 reviews
Working out on an elliptical can burn as many calories as working out on a treadmill. ...allowing you to go forward and backward, as well as adjust stride length to target ...The Precor EFX 546 allows you to stride smoothly while holding the ...

EFX® 546i Elliptical Fitness Crosstrainer™ ' Precor

www.precor.com/en-us/.../efx-546i-elliptical-fitness-crosstrainer-33

With the unique Precor CrossRamp® technology, users can alter the path of the EFX®546i between 13 and 40 degrees in both forward and reverse stride motions, cross ...Excellent stability and freedom of movement for users of all sizes.

FAQ - Precor

List of Error Codes for Precor Fitness Equipment

• Precor has standardized their error code messages across all their equipment so that each error will have the same meaning regardless of what model or equipment type the message appears
• Here we list each error so that you can click through the specific error for additional details about the cause and action to correct the error
  • E2, Lift Error
  • E4, Incomplete Initialization
  • ERR, EEPROM Problem
  • Error 00, Memory, RAM, EEPROM Test Error
  • Error 01, Memory, RAM, EEPROM Test Error
  • Error 02, Memory, RAM, EEPROM Test Error
  • Error 03, Memory, RAM, EEPROM Test Error
  • Error 04, Memory, RAM, EEPROM Test Error
  • Error 05, Key Depressed at Power Up
  • Error 09, Lower PCA Memory Test Error
  • Error 10, Line Frequency out of Acceptable Range
  • Error 11, Watchdog (Upper PCA)
  • Error 12, Watchdog (Lower PCA)
  • Error 13, Fan at Incorrect Speed
  • Error 14, Fan Fail
  • Error 15, AC Input Voltage Too High
  • Error 16, AC Input Voltage Too Low
  • Error 20, Too Many Maximum Power Request in 1 Second
  • Error 21, Too Many Maximum Consecutive Power Requests
  • Error 22, No Motor Pulses at Start Up
  • Error 23, Motor Pulses Missing after Start Up
  • Error 24, Reduce Speed Requested, Speed is not Reducing
  • Error 25, Motor Pulse Count over Acceptable Limit
  • Error 26, Motor Pulse Width Incorrect
  • Error 27, Too Much Drive Motor Current
  • Error 28, Temperature Too High
  • Error 29, Excessive AC Input Current
  • Error 30, 31, 32 and 33, Communications Error
  • Error 37, E-Stop Not Working
  • Error 40, No Lift Motion Detected
  • Error 41, Lift has not Responded in Acceptable Time
  • Error 42, Lift Position Value Out of Range
  • Error 43, Zero Switch not Found
  • Error 44, Un-commanded Lift Motion
  • Error 45, Lift Moving in Wrong Direction
  • Error 46, Low Battery Voltage (AMT12 Only)
  • Error 50, Too Much Brake (Magnet) Current
  • Error 53, Can't Read Target, Can't Find Home Switch
  • Error 54, Target Pulses Lost During Operation
  • Error 55, Brake Home Switch Activated Unexpectedly
  • Error 60 or "Temporarily Out of Order", Auto Stop Not Working (TRM Treadmills)
  • Error 61 or "Temporarily Out of Order, Auto Stop Not Present" (TRM Treadmills)
  • Error 62, Vertical Sensor Failure (AMT12 Only)
  • Error LS, Speed Sensor Signal Missing
  • Error 70, LPCA Not Read
  • Error 71, Blank LPCA
  • Error 72, AMT LPCA Version Unknown
  • Error 73, AMT LPCA Record Bad
  • Error 74, Refurbished Head
  • Error 75, Refurbished Head
  • Error 76, AMT Head Stride Count Less than the LPCA
  • Error 77, AMT UPCA Stride Count Greater than the LPCA
  • Error 78, AMT Belt Replacement Warning
  • Error 79, AMT Belt Replacement Required

Error Code List for Precor Fitness Equipment

Highquality elliptical trainers cost $2,000-$4,000. Precor, one of the highestquality manufacturers of elliptical trainers, sales for around $4,500.

There are plenty of online stores that sell refurbished elliptical machines. Here are a few; however I recommend doing some extra searching of your own.

http://www.globalfitness.com/elliptical-trainer.aspx

http://www.ironcompany.com/usedtreadmillsusedellipticalcrosstrainersusedsteppersusedstepmillsusedexerc.aspx

http://www.ebay.com/sch/sis.html?_nkw=Precor+544+EFX+Elliptical+Trainer+REFURBISHED+Low+Price

Treadmills have a moving belt while elliptical trainers have two foot pedals guiding movement - making it more controlled and safer. Elliptical trainers also have handles, in which the user has the option to move their arms in opposition to their legs to better control movement.

Inspect the ramp that the wheels travel on. If its pocked up or worn then it will cause the unit to feel like its grinding when in use.

Precor Error 45, Lift Moving in Wrong Direction Probable Cause 1. Lift motor hysteresis.
2. Lower PCA is bad.
Corrective Action 1. The error would usually occur when the lift was already in motion (usually downward) when a lift command in the opposite direction (upward) was made. Some lift motors used in production exhibited a very long turnaround time and the lift motor would still be moving in the original commanded direction while the control system was trying to move the lift in the opposite commanded direction. If the error continues to re-occur, replace the lift motor.
2. It is a rare condition, however if the lift moves in the opposite direction commanded, replace the lower PCA.

Precor Error Code 45