Outdoor power equipment: identify, maintain and diagnose
Find the right equipment or engine identifier, then choose the task: maintenance, a replacement part, a fault or a purchase. Model-qualified guides cover mowers, generators, saws, snow blowers and other outdoor equipment. Calculators handle the arithmetic; the actual machine’s instructions establish its permitted use.
Start with the decision in front of you
| Question | Starting point |
|---|---|
| What model or engine is this? | Engine identifiers and manual lookup |
| Which machine fits the work? | Equipment selection by task |
| Why does it not work? | Troubleshooting by observed symptom |
| Which part or fluid is correct? | Model-qualified maintenance and parts |
| What should I do before storage? | Seasonal component instructions |
| Which calculation fits the task? | Six equipment calculators |
Small model differences change the answer
The Deere guide separates an E130 Easy Change system from the filters used on other 100-series tractors. The Honda GCV guide separates dry capacity from an ordinary oil-change refill. Neither figure can safely be copied from a neighboring model.
Check the kind of evidence
A recall notice can require stop-use or repair. A manufacturer listing describes a stated configuration.
A dealer asking price is an offer at a particular time, and an owner’s repair report describes one machine. The source directory and comparison policy keep those distinctions visible.
For a specific hazard, use safety references. Before spending on a replacement, compare a scoped repair with the complete package through purchase planning. Keep your identifiers and service notes in My Equipment if local browser storage suits you.
Use the equipment glossary to check a term before interpreting a label or calculation.
Independent ownership reference
Outdoor power equipment maintenance, parts and troubleshooting
This is a maintenance, parts and troubleshooting reference for owners of mowers, generators, chainsaws, snow blowers, pressure washers and other small-engine equipment. Most outdoor power equipment is two products bolted together, a machine and an engine, and each engine carries its own federal emission label with displacement, model year and a declared design life in hours. When the label has worn off, measure the part yourself.
Work a symptom as a decision sequence instead of guessing. Check six calculators that show their formula on the page: generator watts, fuel mix, chain size, cord gauge, nozzle size and a serial-number date decoder. Every figure names the standard or regulation it came from.
Start where your question is
Six sections, each answering a different kind of question. If you know what is wrong, start at troubleshooting.
If you know what you need to buy, start at parts. If the machine has no readable label, start at engines.
Any term that is unfamiliar is defined in the outdoor power equipment glossary, so no page has to stop and explain a word it uses.
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01
Equipment, by class
Twenty classes of machine and what each is bought on. The specification that decides the purchase, the figures that are quoted at you and decide nothing, and what each class needs in service.
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02
The engine underneath
Almost every machine here is two products bolted together. Where each identification plate is, how to read the federal emission label, which carries displacement, model year and a declared design life in hours, and which oil grade means what.
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03
Parts, identified by measuring them
Chains, blades, plugs, belts, filters and batteries: how each is specified and how to take the measurement off the machine, so a weathered label stops being a problem.
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04
Troubleshooting, in order
Fourteen symptoms worked as decision sequences that run from free to expensive: no-start, starts and dies, surging, no generator output, uneven cut, a blower that will not throw, a saw cutting crooked, a washer with no pressure, a splitter fault, a tiller that will not dig, a battery tool losing power, a PTO that will not engage, a pump moving no water, a compressor not holding pressure.
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05
Seasonal care
Most small-engine repairs are caused by standing still rather than by use. What happens to stored gasoline, the two correct ways to store a machine, how to bring one back, and the one afternoon in autumn that prevents most winter failures.
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06
Equipment calculators
Generator sizing, two-stroke fuel mix, chainsaw chain identification, extension cord gauge, pressure washer nozzle size and a serial-number date decoder. Deterministic, versioned, and tested before publication.
Choose among the six equipment calculations
| Calculator | What it computes |
|---|---|
| Generator sizing | Continuous running watts and starting watts from a load list. |
| Two-stroke fuel mix | Oil quantity for any ratio and any volume, in fluid ounces and millilitres. |
| Chainsaw chain identifier | Chain specification from three measurements taken off the saw. |
| Generator extension cord gauge | The smallest cord gauge that carries the current over the distance. |
| Pressure washer nozzle size | Orifice size and cleaning units from a machine’s flow and working pressure. |
| Serial number date decoder | A manufacture date or era, brand by brand, from each brand’s own published convention. |
Oil, filters and plugs by engine
The engine pages give oil grade and capacity, oil filter, air filter, spark plug and service kit part numbers, and the maintenance schedule for the engines you are most likely to own, each with its source. Also here: how to find the identification that looks a figure up correctly, and which measurement to take yourself when a label is unreadable. Full detail on how figures get onto a page and the source ledger.
Five hazards worth understanding rather than being warned about
Carbon monoxide from a generator, chainsaw kickback, rollover on a slope, fuel handling and product recalls are covered as mechanisms in the safety section: why each one catches people, which of them outrun any reaction, and which are simply a matter of having checked something. Understanding a hazard produces better decisions than being told to be careful.
Nothing here replaces the manual for your own machine. Where this site gives a general mechanism and your manual gives a specific number, the manual is describing a machine we cannot see, and it wins. If you find something on this site that is wrong, tell us: it is the most useful message we get.