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Model # QUANTUM II Official Horizon treadmill
Here are the diagrams and repair parts for Official Horizon QUANTUM II treadmill, as well as links to manuals and error code tables, if available.
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QUANTUM II Fitness & Exercise
#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.
$14.80
In Stock
#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.
$8.50
In Stock
#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
$2.80
In Stock
#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
$5.25
In Stock
#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
#B31
Treadmill assembly diagram
Run deck
Part #MD0701019C
Replaced by #004294FA
?
Manufacturer substitution
This part replaces MD0701019C. Substitute parts can look different from the original.
$188.39 |
6% OFF Phone Price : $200.39
In Stock
Bolt
Part #MZE0121003
Replaced by #004864-00
?
Manufacturer substitution
This part replaces MZE0121003. Substitute parts can look different from the original.
This item is not returnable
$2.79
In Stock
#P06
Treadmill assembly diagram
Cable
Part #MC0501029E
Replaced by #002027-A
?
Manufacturer substitution
This part replaces MC0501029E. Substitute parts can look different from the original.
$22.67
In Stock
#N23
Treadmill assembly 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
$5.43
In Stock
#B28
Treadmill assembly diagram
Air shock
Part #ML0211002
Replaced by #009547-00
?
Manufacturer substitution
This part replaces ML0211002. Substitute parts can look different from the original.
$22.39
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
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
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
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.

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