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DP 21-3900A treadmill Parts
Here are the diagrams and repair parts for DP 21-3900A treadmill, as well as links to manuals and error code tables, if available.
By Schematic
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Browse Parts for 21-3900A Fitness & Exercise
Motor and walking belt assembly diagram
Motor Cover
Part #09154841
The manufacturer no longer makes this part, and there's no substitute part
Washer
Part #26000667
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Rear Roller
Part #39311600
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Motor Pan
Part #09146800
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Side Rail
Part #09137600
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Long Key
Part #29353400
The manufacturer no longer makes this part, and there's no substitute part
Washer
Part #26000400
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Hndrl Grip
Part #04035800
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Bolt
Part #22011200
The manufacturer no longer makes this part, and there's no substitute part
Motor and walking belt assembly diagram
Screw Sm
Part #20018800
The manufacturer no longer makes this part, and there's no substitute part
Most common symptoms to help you fix your fitness & exercise
Choose a symptom to see related treadmill repairs.
Main causes: bad resistance motor, faulty control console, wiring failure…
Main causes: dead batteries, power supply failure, bad wiring connections, faulty control console…
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 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 time and Difficulty
45 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 time and Difficulty
30 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 time and Difficulty
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.…
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