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Horizon
Treadmill

Model # 3.1T Official Horizon treadmill

Here are the diagrams and repair parts for Official Horizon 31T 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 65 parts  |
Rail Lock MB0643001
Rail lock

Part #MB0643001

Replaced by #001251-F

?
Manufacturer substitution
This part replaces MB0643001. Substitute parts can look different from the original.
This item is not returnable
$3.92
In Stock
Screw MZE0104203
#R04

Treadmill diagram

Screw

Part #MZE0104203

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

Cushion B MZE0511003A
#B32

Treadmill diagram

Cushion b

Part #MZE0511003A

Replaced by #005249-A

?
Manufacturer substitution
This part replaces MZE0511003A. Substitute parts can look different from the original.
$11.25
In Stock
Insert MZE0301009
#K10

Treadmill diagram

Insert

Part #MZE0301009

Replaced by #004972-00

?
Manufacturer substitution
This part replaces MZE0301009. Substitute parts can look different from the original.
This item is not returnable
$2.16
In Stock
Console Case Only (1) MB0617054AA
#N08

Treadmill diagram

Console case only (1)

Part #MB0617054AA

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

Wheel Cap MB0207005BB
#Q22

Treadmill diagram

Wheel cap

Part #MB0207005BB

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

Adapter, 12-volt-cse 3.5,4.5,ex33,44,830e N/P
Adapter, 12-volt-cse 3.5,4.5,ex33,44,830e

Part #N/P

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

Strip MB06A6001AB
#K08

Treadmill diagram

Strip

Part #MB06A6001AB

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

Wheel MB0103007B
#L06

Treadmill diagram

Wheel

Part #MB0103007B

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

Fl Wsh 8pk ME0502033
#M26

Treadmill diagram

Fl wsh 8pk

Part #ME0502033

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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