Treadmill

Model # QUANTUM Official Horizon treadmill

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

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QUANTUM Fitness & Exercise
Socket MC0703023
#P11

Treadmill assembly diagram

Socket

Part #MC0703023

Replaced by #019749-A

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Manufacturer substitution
This part replaces MC0703023. Substitute parts can look different from the original.
This item is not returnable
$9.62
9% OFF Phone Price : $10.62
In Stock
Nut MZE0204005
Nut

Part #MZE0204005

Replaced by #004926-00

?
Manufacturer substitution
This part replaces MZE0204005. Substitute parts can look different from the original.
This item is not returnable
In Stock
Breaker MC0702011
#P04

Treadmill assembly diagram

Breaker

Part #MC0702011

Replaced by #003346-00

?
Manufacturer substitution
This part replaces MC0702011. Substitute parts can look different from the original.
In Stock
T-wrench MZE1002003

#NI04

All parts diagram

T-wrench

Part #MZE1002003

Replaced by #005393-00

?
Manufacturer substitution
This part replaces MZE1002003. Substitute parts can look different from the original.
In Stock
Wheel MB0103006B
#L05

Treadmill assembly diagram

Wheel

Part #MB0103006B

Replaced by #000021-B

?
Manufacturer substitution
This part replaces MB0103006B. Substitute parts can look different from the original.
This item is not returnable
In Stock
Pcb Assembly MC0201036A
#M03

Treadmill assembly diagram

Pcb assembly

Part #MC0201036A

Replaced by #013674-DG

?
Manufacturer substitution
This part replaces MC0201036A. Substitute parts can look different from the original.
$416.00
$12.00 OFF Phone Price : $428.00
In Stock
End Cap MB0609040

#NI05

All parts diagram

End cap

Part #MB0609040

Replaced by #000920-00

?
Manufacturer substitution
This part replaces MB0609040. Substitute parts can look different from the original.
This item is not returnable
In Stock
Insert MZE0301009
#K10

Treadmill assembly 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
In Stock
Screw MZE0107023
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
Screw ME0107014
#N06

Treadmill assembly diagram

Screw

Part #ME0107014

Replaced by #004616-00

?
Manufacturer substitution
This part replaces ME0107014. Substitute parts can look different from the original.
This item is not returnable
In Stock

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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

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

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

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 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 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

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.…