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Treadmill

Model # CST3 Official Horizon treadmill

Here are the diagrams and repair parts for Official Horizon CST3 treadmill, as well as links to manuals and error code tables, if available.

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Browse Parts forCST3 Fitness & Exercise

  • Drive Mtr SZTM113MTR
    #M01

    Treadmill diagram

    Drive mtr

    Part #SZTM113MTR

    Replaced by #1000111822

    ?
    Manufacturer substitution
    This part replaces SZTM113MTR. Substitute parts can look different from the original.
    $300.59
    $12.00 OFF Phone Price : $312.59
    In Stock
  • Motor Set SCA302017
    #M02

    Treadmill diagram

    Motor set

    Part #SCA302017

    Replaced by #012804-00

    ?
    Manufacturer substitution
    This part replaces SCA302017. Substitute parts can look different from the original.
    In Stock
  • Screw MZE0107010
    #B61

    Treadmill diagram

    Screw

    Part #MZE0107010

    The manufacturer no longer makes this part, and there's no substitute part

  • Decal, L MG0214094A
    #V34

    Treadmill diagram

    Decal, l

    Part #MG0214094A

    The manufacturer no longer makes this part, and there's no substitute part

  • Support R SP0004041BB
    #AC2

    Treadmill diagram

    Support r

    Part #SP0004041BB

    The manufacturer no longer makes this part, and there's no substitute part

  • Screw MZE0107023
    Screw

    Part #MZE0107023

    The manufacturer no longer makes this part, and there's no substitute part

  • Hook Cover MB0717003A
    #H49

    Treadmill diagram

    Hook cover

    Part #MB0717003A

    The manufacturer no longer makes this part, and there's no substitute part

  • Washer MZE0502025
    #M09

    Treadmill diagram

    Washer

    Part #MZE0502025

    The manufacturer no longer makes this part, and there's no substitute part

  • Foot Rail SZTM119SCV-L
    #Q05

    Treadmill diagram

    Foot rail

    Part #SZTM119SCV-L

    The manufacturer no longer makes this part, and there's no substitute part

  • Washer,spr MZE0501016AB
    #H23

    Treadmill diagram

    Washer,spr

    Part #MZE0501016AB

    The manufacturer no longer makes this part, and there's no substitute part

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor co…

Main causes: rear roller out of alignment, damaged walking belt, bad roller…

Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor…

Main causes: faulty sensors, wiring failure, bad control console…

Main causes: bad control console, wiring failure, bad motor control board…

Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor…

Main causes: damaged walking belt, improper belt tension, bad roller bearing…

Repair guides for treadmills

These step-by-step repair guides will help you safely fix what’s broken on your treadmill.

How to replace a treadmill motor controller

How to replace a treadmill motor controller

Your treadmill motor won't run with a defective motor controller. Replace the motor controller if it doesn't operate the…

Repair difficulty
Time required
 15 minutes or less
How to replace a treadmill walking belt

How to replace a treadmill walking belt

A worn walking belt will begin to slow down during use. If your treadmill walking belt is worn out, replace it using the…

Repair difficulty
Time required
 45 minutes or less
How to replace a treadmill drive motor

How to replace a treadmill drive motor

A defective drive motor won't run when activated by the motor controller. Replace the treadmill drive motor if it doesn'…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your fitness & exercise

Use the advice and tips in these articles and videos to get the most out of your treadmill.

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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