Craftsman 917388551 gas walk-behind lawn mower Parts

The Craftsman gas walk-behind lawn mower model 917388551 takes 20 ounces of engine oil. For best protection, use SAE 30 when temperatures are above 32°F and SAE 5W-30 when temperatures are below 32°F, as listed in the 917388551 owner's manual.

How to check and fill oil correctly

• Park the mower on a level surface and let the engine cool.
• Clean around the dipstick or fill area so debris does not fall into the crankcase.
• Add oil slowly; small engines fill up fast.
• Recheck the dipstick level after each small addition.
• Do not overfill; excess oil can cause smoking and hard starting.

Oil spec quick reference (model 917388551)

Item	Specification
Oil capacity	20 oz
Oil type above 32°F	SAE 30
Oil type below 32°F	SAE 5W-30

Why it matters

Running low on oil can quickly damage a small 4-cycle mower engine, while overfilling can foul the plug and push oil into the air intake. Hitting the correct 20 oz capacity helps the engine run cooler and last longer.

Last updated: February 2026

Common problems we see on the Craftsman 917388551 gas walk-behind lawn mower include hard starting or a starter rope that is hard to pull, loss of power, uneven cutting, excessive vibration, and poor bagging. The troubleshooting chart in the 917388551 owner's manual matches these symptoms closely.

Most common symptoms and likely causes

• Loss of power: cutting too much grass, dirty air filter, grass buildup under the deck, oil overfill, walking speed too fast.
• Poor cut (uneven): worn or loose blade, uneven wheel height settings, debris under the deck.
• Excessive vibration: loose or damaged blade, broken blade adapter, bent crankshaft after impact.
• Starter rope hard to pull: blade dragging in grass, flywheel brake engaged, damaged blade adapter.
• Grass catcher not filling: cutting height too low, worn blade lift, restricted airflow.

Quick checks we recommend first

• Disconnect the spark plug wire before working near the blade.
• Tip the mower on its side with the air filter and carburetor facing up.
• Clean packed grass from the underside of the deck.
• Set all wheels to the same cutting height.
• Inspect the blade and mounting hardware for looseness or damage.

Parts that commonly solve cut and vibration complaints

Symptom	Part to inspect	Example for this model
Uneven cut, poor bagging	Blade	Husqvarna lawn mower 21-in deck 3-in-1 blade 532189028
Vibration, blade won’t stay tight	Blade adapter	Lawn mower blade adapter 532418373

Why it matters

A dull or bent blade and grass buildup reduce airflow under the deck; that hurts mulching and bagging and can create vibration that accelerates wear on the crankshaft and deck hardware.

Last updated: February 2026

For the Craftsman 917388551 gas walk-behind lawn mower, use unleaded regular gasoline; the fuel tank capacity is 1.6 quarts. This matches the fuel specification listed in the 917388551 owner's manual.

What to use (and what to avoid)

Use fresh, clean fuel to help the Briggs & Stratton engine start easily and run smoothly.

• Use unleaded regular gasoline
• Use fresh fuel (do not use last season’s gas)
• Keep the gas can clean and replace it if it starts to rust
• Avoid mixing oil into the gas (this is a 4-cycle engine)
• Avoid storing gasoline from one season to the next

Quick specs for this mower

Item	Spec
Fuel type	Unleaded regular gasoline
Fuel capacity	1.6 quarts
Engine oil type	SAE 30 (above 32°F); SAE 5W-30 (below 32°F)

Why it matters

Using the correct fuel helps prevent hard starting, rough running, and fuel-system issues like stale fuel or contamination (water, rust, dirt). Clean, fresh unleaded regular gas is the simplest way to protect performance and reduce troubleshooting.

If it will not start after fueling

If you filled it correctly but it still will not start, these are the most common fuel-related checks:

• Confirm the tank actually has fuel (not just fumes)
• Drain and replace stale fuel
• Check for water in fuel
• Inspect the air filter and spark plug condition
• Make sure the operator presence control bar is held down while starting

Last updated: February 2026

The model number for this Craftsman gas walk-behind lawn mower is 917.388551 (often written without the dot as 917388551). You can confirm it on the model/serial decal on the rear of the mower housing and in the 917388551 owner's manual.

Where to find the model number on the mower

Look in these common spots on Craftsman walk-behind mowers:

• Rear of the mower housing (model/serial decal)
• Near the rear discharge area on the deck
• On the handle support area (less common)
• In the paperwork that came with the mower

How the model number may be written

You may see the same model shown in different formats. These are equivalent:

Format you see	What it means
917.388551	Full Craftsman model format (with dot)
917388551	Same model number (dot omitted)

Why it matters

Using the exact model number helps us match the correct diagrams and parts for your mower, especially for items like the blade, blade adapter, and handle hardware.

If you are ordering parts for this mower, a common match from the parts list is the husqvarna lawn mower 21-in deck 3-in-1 blade 532189028, which is tied to the 21-inch deck configuration shown for this model.

Last updated: February 2026

For your Craftsman gas walk-behind lawn mower model 917388551, we recommend buying replacement parts by searching with the full model number and matching the part name and ID to your diagram. Our 917388551 owner's manual also helps you identify the correct part section and hardware.

Best ways to find the exact part

• Use the mower’s model number 917388551 (from the rear housing decal) when searching.
• Match the part name and part ID to your parts list to avoid look-alikes.
• Check whether you need a wear item (blade, blade adapter, cable) or a fastener (nut, bolt, washer).
• Confirm quantities and orientation using the exploded view in the manual.
• If you are unsure, replace related hardware at the same time (for example, blade fasteners with a blade).

Common parts customers replace on this model

If you are servicing the cutting system or controls, these are examples of model-matched parts we commonly see replaced:

What you are fixing	Part example (model-matched)	What it does
Dull or damaged blade	Husqvarna lawn mower 21-in deck 3-in-1 blade 532189028	Cuts and mulches/bags grass
Blade won’t stay tight or wobbles	Lawn mower blade adapter 532418373	Couples blade to the engine shaft
Engine safety/zone control issue	Walk-behind lawn mower engine cable 532176556	Engages engine run/stop control

Why it matters

Using the correct Craftsman 917388551 parts prevents fit issues, vibration, and repeat repairs. For example, the manual lists a blade bolt torque of 35 to 40 ft-lbs, which helps keep the blade secure and cutting smoothly.

Quick buying checklist

• Model number: 917388551
• Engine consumables: spark plug, air filter, oil (per manual specs)
• Deck parts: blade, blade adapter
• Hardware: nuts, bolts, washers as needed

Last updated: February 2026

On Craftsman gas walk-behind lawn mower model 917388551, the model and serial numbers are printed on a decal on the rear of the lawn mower housing (rear of the mower deck). Use the model number for parts lookup and the serial number for identification.

Where to look on model 917388551

Focus on the back side of the mower deck (housing), not the engine shroud or handle.

• Check the rear-facing surface of the deck, centered or slightly offset
• Look near the handle mounting points where the handle brackets attach
• Inspect around the rear wheel area and nearby wheel brackets
• Wipe off grass, dust, and oil film so the decal text is readable

What you should see on the decal

The decal typically lists both numbers you need.

Label item	What it’s for	What it looks like
Model number	Matching the correct parts diagrams	917.388551 (may include a dot)
Serial number	Identifying the exact unit	A longer string of letters and numbers

If the decal is hard to read

Use these quick methods to pull the text out of a worn label.

• Take a phone photo and zoom in
• Shine a flashlight across the decal at a low angle
• Clean gently with a damp rag (avoid harsh solvents that can remove printing)
• Compare the format to the identification section in the 917388551 owner’s manual

Why it matters

Using the exact model number prevents ordering the wrong parts for your deck and control setup. For example, the correct control cable length and end fittings can vary; confirm using the walk-behind lawn mower engine cable 532176556 listing only after matching your model.

Last updated: February 2026