Can't find your part?   Contact us:   +1-309-603-4777
Open Hamburger Menu
Sears Parts Direct
Tips to find your model number
Orders
Your models

Keep track of the models you own in your profile

Sign in or Register to view or add models

Schedule a repair
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.

By Schematic
SELECT DIAGRAM
?

This is the number corresponding to the part on the diagram / schematic

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
  • Console SZTM119CNS
    #AN1

    Treadmill diagram

    Console

    Part #SZTM119CNS

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

  • Screw ME0107015
    #M24

    Treadmill diagram

    Screw

    Part #ME0107015

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

  • Screw MZE0108026
    #NI

    Treadmill diagram

    Screw

    Part #MZE0108026

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

  • Air Shock ML0211057A
    #B56

    Treadmill diagram

    Air shock

    Part #ML0211057A

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

  • C-clip MZE0701001
    #Q17

    Treadmill diagram

    C-clip

    Part #MZE0701001

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

  • Shell MB0617080BA
    #N01

    Treadmill diagram

    Shell

    Part #MB0617080BA

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

  • Bolt MJ3022014A
    #H19

    Treadmill diagram

    Bolt

    Part #MJ3022014A

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

  • Fix Plate MJ1040005C
    #B52

    Treadmill diagram

    Fix plate

    Part #MJ1040005C

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

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

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

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

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: faulty sensors, wiring failure, bad control console…

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 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
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 walking board

How to replace a treadmill walking board

A worn-out walking board creates friction with the walking belt and causes the belt to slow down during use. Replace the…

Repair difficulty
Time required
 30 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.…

Parts & More

Air Compressor
Bottom-Mount Refrigerator
Coffee Grinder
Front-Engine Lawn Tractor
Furnace
Gas Chainsaw
Gas Range
Lawn & Garden Engine
Line Trimmer
Microwave
Microwave/Hood Combo
Parts
Range Hood
Television
Top-Mount Refrigerator