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Horizon
Treadmill

Model # CST3.5 Official Horizon treadmill

Here are the diagrams and repair parts for Official Horizon CST35 treadmill, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 13 parts  |
Screw MZE0107010
#B61

Treadmill assy diagram

Screw

Part #MZE0107010

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

Disk Set SM0018004A
#M47

Treadmill assy diagram

Disk set

Part #SM0018004A

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

Frame Set SZTM160CNC
#AN2

Treadmill assy diagram

Frame set

Part #SZTM160CNC

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

End Cap MB0609124BA
#Q09

Treadmill assy diagram

End cap

Part #MB0609124BA

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

Spd Sensor SSED080434BA
#P14

Treadmill assy diagram

Spd sensor

Part #SSED080434BA

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

Washer MZE0502197A
#H21

Treadmill assy diagram

Washer

Part #MZE0502197A

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

Washer MZE0502198A
#B42

Treadmill assy diagram

Washer

Part #MZE0502198A

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

Lock Latch SP0027028AC
#H31

Treadmill assy diagram

Lock latch

Part #SP0027028AC

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

Air Shock ML0211057A
#B56

Treadmill assy diagram

Air shock

Part #ML0211057A

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

Tube-r SP0004061AA
#AC2

Treadmill assy diagram

Tube-r

Part #SP0004061AA

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

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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Why does my treadmill's walking belt slow down?

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

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Why is my treadmill's walking belt slipping?

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

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Why is my treadmill's walking belt off center?

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

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Why won't my treadmill start even though the console display works?

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

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Why is my treadmill's heart rate sensor not accurate?

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

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Why does my treadmill have no display?

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

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Why won't my treadmill power up?

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

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Repair guides for treadmills

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

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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…

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Repair difficulty
Time required
 15 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'…

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Repair difficulty
Time required
 15 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…

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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.

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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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