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GMC GUN125-4B gas furnace Parts
Here are the diagrams and repair parts for GMC GUN125-4B gas furnace, as well as links to manuals and error code tables, if available.
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Browse Parts for GUN125-4B Gas Furnace
Heat exchanger assembly diagram
Flue Rstrctr
Part #18248-12S
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Gasket Kit
Part #13926-103
The manufacturer no longer makes this part, and there's no substitute part
Casing diagram
Top Channel (gun100-4b, Gus100-4)
Part #18221-05S
The manufacturer no longer makes this part, and there's no substitute part
Gas train diagram
Gas Burner
Part #B18225-00
The manufacturer no longer makes this part, and there's no substitute part
Blower assembly diagram
Motor Mounting Bracket
Part #B13768-59
The manufacturer no longer makes this part, and there's no substitute part
Blower assembly diagram
Blower Wheel
Part #B13680-46
The manufacturer no longer makes this part, and there's no substitute part
Misc. electrical/hardware diagram
Timed Fan
Part #B18099-03
The manufacturer no longer makes this part, and there's no substitute part
Gas train diagram
Burner Assembly
Part #B18225-13
The manufacturer no longer makes this part, and there's no substitute part
Casing diagram
Furnace Blower Door
Part #18223-40
The manufacturer no longer makes this part, and there's no substitute part
Gas train diagram
Manifold, 5
Part #B18264-19
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.
How to replace a lawn mower front deck tray
Learn how to replace the front deck tray on your lawn mower if it's cracked or damaged.…
Repair time and Difficulty
60 minutes or less
How to replace a lawn mower transmission
Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels.…
Repair time and Difficulty
60 minutes or less
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 time and Difficulty
45 minutes or less
Effective articles & videos to help repair your furnaces
Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.
Get expert tips for preparing your furnace for winter. Follow maintenance tips to keep your furnace in top shape.…
Find out how new DOE standards going into effect in 2023 can affect you and what you need to do.…
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Parts & More
Parts
Blower Wheel 134-2513-01Handle 749-04693A-0637Home Electronics Coil 146005311Air Grid 00604148Home Electronics Flywheel YASFX013005Camshaft 209-32201-11Cabinet X25141021Label (trade 224-91635-03Lead Connector BN39-00441BC-film,mpp 2301-001251Link-mechan 797233Shrtblk St UP00739Home Electronics Knob 23874870Bkt,backing, 191337Home Electronics Shield 126-02715-01Home Electronics Holder YEFK04129Home Electronics Capacitor 022-07433HANDLE LATC 73-837Passive Woof TCG35228607PANEL- W/CON 52420100