Owner’s manual
View engine
Should I use 87 or 91 gas for lawn mower?
For the Craftsman lawn mower model 917371800, use fresh regular unleaded gasoline (87 octane) for normal operation. Higher octane (like 91) does not add power or improve mowing performance; the bigger priority is keeping fuel fresh and managing ethanol blends per the 917371800 owner's manual.
What to use (and what to avoid)
- Use 87 octane regular unleaded for everyday mowing.
- Use fresh fuel; stale fuel is a common no-start cause.
- Avoid storing ethanol-blended fuel for long periods; it can attract moisture and separate during storage.
- Do not add engine or carburetor cleaner to the fuel tank; it can damage the fuel system.
- If the mower will sit 30 days or longer, empty the tank and run the engine until the fuel lines and carburetor are empty.
Quick comparison: 87 vs 91 in a walk-behind mower
| Fuel choice | What you get | Best use case |
|---|---|---|
| 87 octane (regular) | Correct performance for small mower engines | Normal mowing, weekly use |
| 91 octane (premium) | No added power in this application | Not needed for this model |
Storage and “bad gas” prevention checklist
- Buy only what you will use in 30 days.
- Store fuel in a clean, sealed gas can.
- If storing the mower, empty the tank and run it dry (carburetor empty).
- Use fresh fuel next season.
- If the mower will not start after storage, check basics like air filter, fuel condition, and ignition.
Why it matters
Fuel issues show up as hard starting, surging, or a mower that will not start at all. The manual specifically warns that alcohol-blended fuels can create acids during storage and damage the fuel system, so fuel freshness matters more than octane.
Last updated: January 2026
What are the most common issues with 917371800?
The most common issues we see on the Craftsman 917371800 walk-behind mower involve drive problems (self-propel not pulling), cutting and discharge problems (poor cut, clumping, chute issues), and normal wear items loosening or failing. Use the owner's manual for model-specific adjustments and maintenance intervals.
Common symptoms and what they usually point to
- Self-propel won’t move or slips: worn/loose drive cable, pulley wear, transmission wear, or debris under the drive cover
- Uneven cut or vibration: bent/dull blade, damaged blade adapter, loose hardware
- Grass won’t discharge or bag well: clogged chute, damaged deflector/door, bag or frame issues
- Wheels won’t track or height won’t hold: worn wheel components, pinion/selector parts, missing clips
- Controls feel loose: worn lever, stretched cable, missing fasteners
Quick checks we recommend first
- Shut off the engine, disconnect the spark plug wire, and tip the mower safely (carburetor and air filter up).
- Clear packed grass from the deck and both chute paths.
- Inspect the blade area for damage; check the blade adapter for rounding or cracking.
- Check drive engagement: the cable should pull the transmission arm firmly when you squeeze the drive control.
- Look for missing clips, E-rings, and loose nuts around wheels and linkages.
Parts that commonly solve these problems (when worn)
| Symptom | Commonly involved part | Example part on this model |
|---|---|---|
| No self-propel / weak pull | Drive cable, pulley, transmission | Lawn mower drive control cable 532197011, husqvarna lawn mower idler pulley 532166043, lawn mower transmission assembly 532188294 |
| Poor discharge / bagging | Chute, door/deflector, bag | Chute 583708901, hex chute door 532190580, lawn mower grass bag 583338801 |
| Vibration / poor cut | Blade, blade adapter | Husqvarna lawn mower mulching blade, 21-in 159267, lawn mower blade adapter 532186766 |
Why it matters
Drive and cutting issues on a gas walk-behind mower usually get worse quickly; a slipping drive can damage the transmission, and a loose or damaged blade system can create unsafe vibration. Catching wear early keeps your 917371800 mowing evenly and moving correctly.
Last updated: March 2026
What model number is the Craftsman 917371800?
The model number for this Craftsman walk-behind gas lawn mower is 917.371800 (often written without the dot as 917371800). You’ll see it printed on the mower’s model tag and on the cover page of the 917371800 owner’s manual.
Where to find the model number on the mower
Check these common locations on Craftsman walk-behind mowers:
- On the rear of the deck near the discharge chute
- On the left or right side of the deck, near the wheel height adjuster
- Near the engine mounting area on the deck
- On a sticker or metal plate that also lists the serial number
Why the dot matters (917.371800 vs 917371800)
Both formats refer to the same mower; the dot is just a formatting style used on some labels and manuals.
| You might see | What it means | Use it for |
|---|---|---|
| 917.371800 | Same model number with punctuation | Reading the model tag or manual |
| 917371800 | Same model number without punctuation | Parts lookup and ordering |
Why it matters when ordering parts
Using the exact model number helps us match the correct diagrams and parts for your mower’s drive system, wheels, and controls.
- Drive parts can vary by model series
- Bagging and discharge components can be model-specific
- Hardware sizes and fasteners can differ across similar-looking mowers
If you’re replacing a drive control component, match the part to the diagram in the manual; for example, the drive control lever listed for this model is lawn mower drive control lever 532425662.
Quick tip
If your mower has electric start, keep the ignition key with the mower; a common replacement is molded ignition key 532180331.
Why it matters
A single digit off in a Craftsman model number can point to a different deck, drive setup, or engine configuration, which can lead to ordering the wrong blade, cable, or transmission part.
Last updated: January 2026
