Treadmill

Model # ADVANCE 300 Official Horizon treadmill

Here are the diagrams and repair parts for Official Horizon ADVANCE 300 treadmill, as well as links to manuals and error code tables, if available.

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ADVANCE 300 Fitness & Exercise
Breaker MC0702011
#P04

Treadmill assembly diagram

Breaker

Part #MC0702011

Replaced by #003346-00

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Manufacturer substitution
This part replaces MC0702011. Substitute parts can look different from the original.
Back Order
Rail Lock MB0643001
#Q10

Treadmill assembly diagram

Rail lock

Part #MB0643001

Replaced by #001251-F

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Manufacturer substitution
This part replaces MB0643001. Substitute parts can look different from the original.
In Stock
Washer MZE0505033
Washer

Part #MZE0505033

Replaced by #005196-00

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Manufacturer substitution
This part replaces MZE0505033. Substitute parts can look different from the original.
This item is not returnable
In Stock
Belt MD0602023
#R03

Treadmill assembly diagram

Belt

Part #MD0602023

Replaced by #1000109577

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Manufacturer substitution
This part replaces MD0602023. Substitute parts can look different from the original.
In Stock
Screw MZE0104203
#R04

Treadmill assembly diagram

Screw

Part #MZE0104203

Replaced by #004486-00

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Manufacturer substitution
This part replaces MZE0104203. Substitute parts can look different from the original.
This item is not returnable
In Stock
Spring MZE1103001
#L15

Treadmill assembly diagram

Spring

Part #MZE1103001

Replaced by #005438-00

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Manufacturer substitution
This part replaces MZE1103001. Substitute parts can look different from the original.
This item is not returnable
In Stock
Safety Key SM0005002B
#AN2

Treadmill assembly diagram

Safety key

Part #SM0005002B

Replaced by #016488-Z

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Manufacturer substitution
This part replaces SM0005002B. Substitute parts can look different from the original.
In Stock
Cable MC0503001B
#P08

Treadmill assembly diagram

Cable

Part #MC0503001B

Replaced by #002124-B

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Manufacturer substitution
This part replaces MC0503001B. Substitute parts can look different from the original.
This item is not returnable
In Stock
Fix Plate MJ1040005C
#B52

Treadmill assembly diagram

Fix plate

Part #MJ1040005C

Replaced by #007490-C

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Manufacturer substitution
This part replaces MJ1040005C. Substitute parts can look different from the original.
This item is not returnable
In Stock
Treadmill Walking Belt MD0610032CB
#R02

Treadmill assembly diagram

Treadmill walking belt

Part #MD0610032CB

Replaced by #004232-EB

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Manufacturer substitution
This part replaces MD0610032CB. Substitute parts can look different from the original.
$182.89
6% OFF Phone Price : $194.89
In Stock

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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…

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

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 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 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.…