Horizon
Treadmill

Model #720T Official Horizon treadmill

Here are the diagrams and repair parts for Horizon 720T treadmill, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Showing 10 of 115 parts

Exercise Equipment Washer

See All Related Diagrams

Washer

Part #MZE0502017
Replaced by #020425-00
?
Manufacturer substitution
This part replaces MZE0502017. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16
Treadmill Bolt#B29

Treadmill Diagram

Deck bolt

Part #MZE0105005
Replaced by #004562-00
?
Manufacturer substitution
This part replaces MZE0105005. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16
Treadmill Wire Harness#P13

Treadmill Diagram

Cable

Part #MC0503001B
Replaced by #002124-B
?
Manufacturer substitution
This part replaces MC0503001B. Substitute parts can look different from the original.
This item is not returnable
In Stock
$4.47
Treadmill Screw#P11

Treadmill Diagram

Screw

Part #ME0102042
Replaced by #004381-00
?
Manufacturer substitution
This part replaces ME0102042. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16
Exercise Equipment Arc Washer#Z06

Treadmill Diagram

Arc washer

Part #ME0503001
Replaced by #005163-00
?
Manufacturer substitution
This part replaces ME0503001. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16
Wheel#B24

Treadmill Diagram

Wheel

Part #MB0103040CA
Replaced by #000037-CA
?
Manufacturer substitution
This part replaces MB0103040CA. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.26
Exercise Equipment Screw

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Screw

Part #MZE0107023
Replaced by #004620-00
?
Manufacturer substitution
This part replaces MZE0107023. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16
Treadmill Reed Switch#N05

Treadmill Diagram

Sw cable

Part #MC0403003B
Replaced by #001956-C
?
Manufacturer substitution
This part replaces MC0403003B. Substitute parts can look different from the original.
This item is not returnable
In Stock
$5.43
Grip Pulse#N64

Treadmill Diagram

Grip pulse

Part #MC0712063A
Replaced by #039042-A
?
Manufacturer substitution
This part replaces MC0712063A. Substitute parts can look different from the original.
In Stock
$10.82
Screw#M08

Treadmill Diagram

Screw

Part #MZE0104074
Replaced by #004481-Z
?
Manufacturer substitution
This part replaces MZE0104074. Substitute parts can look different from the original.
This item is not returnable
In Stock
$2.16

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

Main causes: faulty sensors, wiring failure, bad control console
Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor control board
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: damaged walking belt, improper belt tension, bad roller bearing
Main causes: rear roller out of alignment, damaged walking belt, bad roller

Repair guides for treadmills

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

June 1, 2015
By Lyle Weischwill
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 motor correctly.

Repair difficulty
Time required
 15 minutes or less
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 these steps.

Repair difficulty
Time required
 45 minutes or less
June 1, 2015
By Lyle Weischwill
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't run.

Repair difficulty
Time required
 15 minutes or less

Articles and videos common to all fitness & exercise

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

June 29, 2022

Top questions about Sears and Sears PartsDirect

By Lyle Weischwill

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