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Onan B48G-GA020/3858C gas engine Parts
Here are the diagrams and repair parts for Onan B48G-GA020/3858C gas engine, as well as links to manuals and error code tables, if available.
By Schematic
SELECT DIAGRAM
Browse Parts for B48G-GA020/3858C Gas Engine
Air housing diagram
Gasket
Part #154-1725
The manufacturer no longer makes this part, and there's no substitute part
Starter motor parts diagram
Drive Assembly
Part #191-1036
The manufacturer no longer makes this part, and there's no substitute part
Flywheel alternator - 15 ampere diagram
Regulator
Part #191-1206
The manufacturer no longer makes this part, and there's no substitute part
Fuel system diagram
Seal
Part #509-0145
The manufacturer no longer makes this part, and there's no substitute part
Lock 5/16" - Code 21bj, 21bk, 21bw
Part #850-0045
The manufacturer no longer makes this part, and there's no substitute part
Starter motor parts diagram
Cap
Part #191-1287
The manufacturer no longer makes this part, and there's no substitute part
Fuel system diagram
Lawn & Garden Equipment Engine Washer
Part #526-0140
The manufacturer no longer makes this part, and there's no substitute part
Carburetor diagram
Screw
Part #146-0142
The manufacturer no longer makes this part, and there's no substitute part
Fuel system diagram
Washer
Part #526-0234
The manufacturer no longer makes this part, and there's no substitute part
Gearcase diagram
Screw
Part #800-0545
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: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…
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.
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Repair time and Difficulty
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Repair time and Difficulty
60 minutes or less
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When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…
Repair time and Difficulty
45 minutes or less
Effective articles & videos to help repair your lawn & garden engines
Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.
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