Craftsman 917388840 rotary lawn mower Parts

On a Craftsman rotary lawn mower like model 917388840, the model and serial numbers are printed on a decal on the rear of the mower housing (deck). We recommend writing both down exactly as shown, then using them to match the correct parts and manual.

Check these spots in order:

• Rear of the mower housing (back side of the deck), on a decal
• Near the rear discharge opening area (still on the deck)
• Around the handle mounting area on the deck (if the decal was relocated)

For a diagram and parts list that matches your mower, use the 917388840 owner's manual.

A worn or dirty decal is the most common reason the model number is misread.

• Clean the decal gently with a damp rag; avoid harsh solvents
• Copy the number exactly, including dots or spaces if shown (example format: 917.388840)
• Record the serial number too; it helps identify production variations
• Take a clear photo before the decal fades further

The model number ensures you get the right blade, control cable, and handle hardware for your exact deck and handle setup. For example, this model uses parts such as the walk-behind lawn mower engine cable 532176556 and the upper handle 532194179, which can vary across similar Craftsman mowers.

Last updated: February 2026

For the Craftsman rotary lawn mower model 917388840, use 87-octane unleaded gasoline (regular). Higher octane such as 89 does not improve power or reliability in typical walk-behind mower engines; using fresh fuel and the correct oil level matters more for easy starting and long engine life. See the fuel and safety guidance in the owner's manual.

• Use: Fresh, clean 87-octane unleaded gasoline.
• Avoid: Old gas (more than about 30 days in the tank or can), contaminated fuel, or fuel mixed with water.
• Avoid: Overfilling the tank; leave room for expansion.
• Do not store the mower with fuel in it unless you follow the storage steps in the manual.

Most “won’t start” and “runs rough” complaints on walk-behind mowers trace back to fuel quality and storage, not octane. Fresh 87-octane fuel helps the carburetor and ignition system do their job without varnish buildup.

• Confirm the operator presence control bar is held down while starting.
• Use the primer correctly for a cold start (per the manual).
• Check that the spark plug wire is firmly connected.
• If the starter rope is difficult to pull, follow the steps in lawn mower pull cord stuck.

Last updated: February 2026

Common problems on the Craftsman 917388840 rotary lawn mower include hard starting (often from flooding or fuel/air issues), loss of power from airflow or deck buildup, uneven cutting from blade or wheel-height issues, and excessive vibration from a loose or damaged blade or adapter. See the troubleshooting section in the owner's manual for symptom-by-symptom checks.

• Won’t start or starts then dies: over-priming (flooding), stale fuel, dirty air filter, spark plug issues
• Loss of power: dirty air filter, grass and debris packed under the deck, oil level too high
• Uneven cut: worn/bent/loose blade, wheel heights set unevenly, deck buildup
• Excessive vibration: worn/bent/loose blade, bent crankshaft, damaged blade adapter
• Starter rope hard to pull: blade dragging in grass, brake engaged when control bar is released, crankshaft or adapter problems

1. Starting technique: In warm weather, avoid repeated priming; over-priming can flood the engine. If flooded, wait a few minutes and try again without priming.
2. Airflow and deck cleanliness: Clean grass and debris from under the mower deck; buildup is a top cause of power loss and poor cutting.
3. Blade and fasteners: Inspect the blade for bends and tightness; replace worn hardware as needed.
4. Wheel height settings: Confirm both sides are set to the same cutting height.

These issues are more than convenience problems. A loose blade or damaged adapter can cause severe vibration, accelerate wear on the crankshaft, and make the mower unsafe to operate. Keeping the deck clean and the blade system tight helps the engine maintain proper speed and cutting performance.

Last updated: February 2026

For Craftsman rotary lawn mower model 917388840, “part numbers” means the individual replacement numbers for each component on the mower (handle parts, deck hardware, blade parts, cables, etc.). The fastest way to get the right number is to match your needed part to the exploded diagrams and parts list in the 917388840 owner's manual.

These are examples of part numbers shown for model 917388840 in the parts list and on this model’s parts pages:

• Upper handle: 194179X479 (see upper handle 532194179)
• Engine zone control cable: 176556 (see walk-behind lawn mower engine cable 532176556)
• Rope guide: 179585 (see rope guide 586122501)
• Handle bolt: 191574 (see handle bolt 532191574)
• Rear skirt: 189008 (see skirt 532413160)
• 21-in deck 3-in-1 blade: 189028 (see husqvarna lawn mower 21-in deck 3-in-1 blade 532189028)

Use this checklist so you order the exact match for your mower’s configuration:

• Identify the system: handle, deck, wheels, blade, or controls
• Find the part on the diagram, then match the key number to the description
• Confirm whether you need left-hand (LH) or right-hand (RH) versions (common on brackets and arms)
• Compare your old part to the diagram photo and description (shape and mounting points)
• Replace related fasteners when needed (nuts, washers, screws) to keep repairs tight and safe

On Sears PartsDirect, you may see both a manufacturer part number and a Sears PartsDirect part ID.

Using the correct part number for Craftsman 917388840 helps ensure proper fit and safe operation, especially for blade and control parts (like the zone control cable) that affect starting, stopping, and cutting performance.

Last updated: February 2026