Owner’s manual
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Where to find model number on mower?
On the Craftsman rotary lawn mower model 917378852, the model number is typically printed on a product ID label attached to the mower deck. Check the deck area near the engine first; that is the most common location for walk-behind mowers. See the 917378852 owner's manual for label-location diagrams and identification details.
Common places to check on a walk-behind mower
Look for a sticker or metal tag with the model number and serial number in these spots:
- On top of the mower deck, behind or beside the engine
- On the rear of the deck near the discharge opening or rear guard
- On the back of the mower under the rear flap or guard
- Near the height-adjuster area by a wheel bracket
- On the handle mounting area where the handle bolts to the deck
What the label usually looks like
Most Craftsman walk-behind mower ID labels include a few key fields. Use this quick guide when you find the tag:
| Label field | What it’s used for | Why you need it |
|---|---|---|
| Model number | Identifies the exact mower version | Ensures parts diagrams match your mower |
| Serial number | Identifies the production run | Helps confirm correct replacement parts |
| Engine info | Identifies the engine model/type | Helps when ordering engine-specific parts |
Tips if the label is dirty, faded, or missing
- Wipe the deck with a damp rag and mild cleaner; grass film can hide the print
- Use a flashlight at an angle; raised or glossy print shows up better
- Take a close-up photo and zoom in to read worn characters
- If the label is gone, use the parts diagrams in the 917378852 owner's manual to match deck and control features
Why it matters
The model number is the fastest way to match the correct Craftsman parts (blade, wheels, drive belt, control cable) to your mower’s exact deck and drive configuration.
Last updated: January 2026
What model number is the Craftsman 917378852?
The model number for this Craftsman walk-behind rotary lawn mower is 917378852. You’ll use 917378852 to match the correct parts (blade, drive belt, wheels) and to pull the right diagrams and maintenance instructions in the 917378852 owner's manual.
Where to find the model number on the mower
Most Craftsman walk-behind mowers show the model number on an ID label or plate. Check these common spots:
- Rear of the deck near the discharge opening
- Top of the deck near the engine mounting area
- Behind the engine, on the deck surface
- On the handle support or rear frame area
- Near the height adjuster hardware
Why the exact model number matters
Craftsman mowers can look similar across years, but parts can differ by model. Using 917378852 helps us match the correct fit and avoid ordering the wrong item.
- Ensures the correct deck and blade style (for example, 21-in deck configurations)
- Helps match drive system parts like the lawn mower ground drive belt 532175436
- Helps match wheel and axle components such as the lawn mower wheel 582976701
- Ensures diagrams and hardware (nuts, washers, E-rings) match your build
Quick reference: model number vs. other numbers
| What you see | What it means | Use it for |
|---|---|---|
| 917378852 | Sears model number | Parts lookup, diagrams, manual |
| Engine model/type code | Engine identification | Engine-specific parts (carburetor, ignition) |
| Part number/part ID | Individual component ID | Ordering a specific replacement part |
Why it matters
When you’re troubleshooting issues like “won’t move,” poor cutting, or a loose wheel, the correct model number is the fastest way to get the right Craftsman parts and the right repair steps.
Last updated: January 2026
Should I use 87 or 91 gas for lawn mower?
For the Craftsman rotary lawn mower model 917378852, use 87-octane (regular) unleaded gasoline for normal operation. Higher octane (like 91) does not add power or improve reliability in a mower engine; it mainly resists knock in high-compression engines.
What to use (and what to avoid)
- Use fresh 87-octane unleaded from a busy station.
- Avoid old gas (stale fuel is a top cause of hard starting and surging).
- Avoid high-ethanol blends when possible; ethanol attracts moisture and can cause storage issues.
- Do not mix oil in the gas unless your engine is a 2-cycle (most walk-behind mowers like this are 4-cycle).
- Follow the exact fuel guidance and storage notes in the 917378852 owner's manual.
87 vs 91: quick comparison
| Fuel choice | Best use case | What you should expect |
|---|---|---|
| 87 octane (regular) | Everyday mowing | Normal power, normal starting, correct for most mower engines |
| 91 octane (premium) | Not needed for typical mower engines | No performance gain; extra cost without benefit |
If you are having starting or running problems
Higher octane is not the fix. These checks solve most “won’t start” or “runs rough” complaints:
- Drain and replace old fuel; refill with fresh 87.
- Check the air filter and spark plug condition.
- Make sure the blade area is clear (a jam can make starting harder).
- Verify the operator presence control and cable move freely.
- If the self-propelled drive is acting up, inspect the belt and drive components.
For step-by-step diagnostics, use lawn mower wont start troubleshooting video fuel ignition and compression.
Why it matters
Using the right fuel keeps the carburetor cleaner, improves starting after storage, and reduces downtime. Most mower issues blamed on “bad gas” are really stale fuel or storage-related moisture, not octane rating.
Last updated: January 2026
