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Sears
Cycling

Model # 489451780 Official Sears 20" lightweight bicycle

Here are the diagrams and repair parts for Official Sears 489451780 20" lightweight bicycle, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

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Model diagram and schematic

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Showing 10 of 42 parts  |
Pedal 070002
#20

Unit parts diagram

Pedal

Part #070002

The manufacturer no longer makes this part, and there's no substitute part

Rim Strip 042006
#11

Unit parts diagram

Rim strip

Part #042006

The manufacturer no longer makes this part, and there's no substitute part

Exp Blt/wdg 008024
#4

Unit parts diagram

Exp blt/wdg

Part #008024

The manufacturer no longer makes this part, and there's no substitute part

Chain 072013
#21

Unit parts diagram

Chain

Part #072013

The manufacturer no longer makes this part, and there's no substitute part

Rr Fndr/brc 051017
#26

Unit parts diagram

Rr fndr/brc

Part #051017

The manufacturer no longer makes this part, and there's no substitute part

Ming Ta Bicycle Brake Shoe Set 104002
#33

Unit parts diagram

Ming ta bicycle brake shoe set

Part #104002

The manufacturer no longer makes this part, and there's no substitute part

Roadmaster Rear Axle And Bearing Set 054001
#25

Unit parts diagram

Roadmaster rear axle and bearing set

Part #054001

The manufacturer no longer makes this part, and there's no substitute part

Axle Brg Set 053002
#14

Unit parts diagram

Axle brg set

Part #053002

The manufacturer no longer makes this part, and there's no substitute part

Spkt Cluster 075001
#41

Unit parts diagram

Spkt cluster

Part #075001

The manufacturer no longer makes this part, and there's no substitute part

Front Wheel Assembly 045009
#12

Unit parts diagram

Front wheel assembly

Part #045009

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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Why won't my treadmill power up?

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

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Why is my treadmill's walking belt off center?

Main causes: rear roller out of alignment, damaged walking belt, bad roller…

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Why won't my treadmill start even though the console display works?

Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor…

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Why is my treadmill's heart rate sensor not accurate?

Main causes: faulty sensors, wiring failure, bad control console…

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Why does my treadmill have no display?

Main causes: bad control console, wiring failure, bad motor control board…

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Why does my treadmill's walking belt slow down?

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

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Why is my treadmill's walking belt slipping?

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

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Repair guides for treadmills

These step-by-step repair guides will help you safely fix what’s broken on your treadmill.

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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…

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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…

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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'…

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Repair difficulty
Time required
 15 minutes or less

Articles and videos for treadmills

Use the advice and tips in these articles and videos to get the most out of your treadmill.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Top questions about Sears and Sears PartsDirect

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

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How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…

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