Roadmaster
Cycling

Model # R3951SR Official Roadmaster bicycle

Here are the diagrams and repair parts for Official Roadmaster R3951SR bicycle, as well as links to manuals and error code tables, if available.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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Showing 10 of 57 parts  |

Bracket HH5110D
#39

Unit parts diagram

Bracket

Part #HH5110D

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

Pedal,1/2" KK2840D
#14

Unit parts diagram

Pedal,1/2"

Part #KK2840D

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

Unv Derail PP8718D
#31

Unit parts diagram

Unv derail

Part #PP8718D

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

Wheel 082627D
#18

Unit parts diagram

Wheel

Part #082627D

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

Crank,1pc, HH5551D
#15

Unit parts diagram

Crank,1pc,

Part #HH5551D

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

Cluster PP7486D
#20

Unit parts diagram

Cluster

Part #PP7486D

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

Bracket HH5112D
#26

Unit parts diagram

Bracket

Part #HH5112D

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

Handlebar PP0300D
#4

Unit parts diagram

Handlebar

Part #PP0300D

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

Kickstand PP0050D
#17

Unit parts diagram

Kickstand

Part #PP0050D

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

Front Wheel HH5080D
#10

Unit parts diagram

Front wheel

Part #HH5080D

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

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Repair difficulty
Time required
 45 minutes or less

Articles and videos for gas walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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

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.…

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.…

Lawn mower won't start troubleshooting video: spark plug and ignition problems video

Lawn mower won't start troubleshooting video: spark plug and ignition problems video

Find out how to test and fix problems with the spark plug, stop wire, ignition coil and flywheel.…