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Model # T912 Official Nautilus treadmill
Here are the diagrams and repair parts for Official Nautilus T912 treadmill, as well as links to manuals and error code tables, if available.
By Schematic
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T912 Fitness & Exercise
#20
Motor asy diagram
Nautilus treadmill motor control board
Part #SM41094
The manufacturer no longer makes this part, and there's no substitute part
#32
Covers assy diagram
Cover,mtr
Part #SM41108
The manufacturer no longer makes this part, and there's no substitute part
#55
Belt assy diagram
Kit,deck hardware
Part #SM26405
The manufacturer no longer makes this part, and there's no substitute part
#49
Frame assy diagram
Foam pad
Part #SM36271-001
The manufacturer no longer makes this part, and there's no substitute part
#75
Roller assy diagram
Rotary tensioner
Part #SM27552
The manufacturer no longer makes this part, and there's no substitute part
#7
Motor asy diagram
Kit,flywheel
Part #SM26416
The manufacturer no longer makes this part, and there's no substitute part
#95
Front 1 assy diagram
Screw 3/8-16x1.0
Part #SM22246
The manufacturer no longer makes this part, and there's no substitute part
#37
Covers assy diagram
Kit,cover uprght top
Part #SM26424
The manufacturer no longer makes this part, and there's no substitute part
#10
Motor asy diagram
Lock washer
Part #SM41260
The manufacturer no longer makes this part, and there's no substitute part
#47
Frame assy diagram
Kit,bearing asy
Part #SM26403
The manufacturer no longer makes this part, and there's no substitute part
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
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
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
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.
Get answers to frequently asked questions about Sears and Sears PartsDirect.…