Craftsman 917370770 lawn mower Parts

The Craftsman 917370770 walk-behind mower takes 20 ounces of engine oil when filled to the proper level on the dipstick. We recommend checking the oil level with the mower on a level surface and topping off slowly to avoid overfilling.

Use the oil viscosity that matches your mowing temperatures, then verify the final level on the dipstick (not by “dumping in” a full bottle).

• Use SAE 30 for temperatures above 32°F
• Use SAE 5W-30 for temperatures below 32°F
• Fill in small amounts, then recheck the dipstick
• Do not overfill; excess oil can cause smoking and hard starting
• Change oil with the engine warm (it drains more completely)

For the exact procedure and maintenance intervals, follow the 917370770 owner's manual.

Correct oil capacity protects the Briggs & Stratton 4-cycle engine from overheating and premature wear. Underfilling reduces lubrication; overfilling can aerate oil and push it into the breather, leading to smoke and performance issues.

Last updated: February 2026

For Craftsman walk-behind mower model 917370770, the most dependable way to identify the year is to use the serial number on the rear housing decal and decode the date portion using the identification details in the 917370770 owner's manual. This ties the build date to your exact mower, not just the engine family.

The manual for model 917370770 places the model and serial numbers on a decal on the rear of the lawn mower housing.

• Look on the rear of the mower deck/housing for the decal
• Copy the serial number exactly (include all digits)
• Record the date of purchase for service history
• Clean the decal gently so every digit is readable

Many Craftsman serial numbers include a 6-digit date segment that is commonly interpreted as MMDDYY (month, day, year). When you see a segment like that, read it like this:

• Month is 01 to 12
• Day is 01 to 31
• Year is the last two digits (YY)
• If the first two digits are 13 or higher, treat it as a different serial format and follow the identification guidance in the manual

The correct year helps us match the right replacement parts for your exact build, especially common wear items like the blade, blade adapter, drive components, and hardware.

If you are replacing a worn cutting blade on this mower, a common match is the lawn mower 21-in deck mulching blade 532406706.

Last updated: February 2026

Common problems on the Craftsman 917370770 walk-behind mower include no-start conditions (stale fuel, dirty air filter, bad spark plug, or a released control bar), loss of power from deck buildup, and poor cut or vibration from a worn, bent, or loose blade or a damaged blade adapter. See the 917370770 owner's manual troubleshooting chart for model-specific checks.

• Won’t start: stale fuel, dirty air filter, spark plug wire off, bad spark plug, weak battery (if equipped)
• Loss of power: grass and debris packed under the deck, cutting too much at once, dirty air filter
• Poor cut or uneven cut: worn or bent blade, uneven wheel height settings, deck packed with clippings
• Excessive vibration: loose blade bolt, bent blade, broken blade adapter, bent crankshaft
• Starter rope hard to pull: blade dragging in grass, brake engaged when control bar is released

1. Use fresh gasoline; drain and refill if fuel is old.
2. Check the control bar is held firmly to the handle while starting.
3. Inspect and clean the underside of the mower deck (built-up clippings reduce airflow and power).
4. Inspect the blade for bends, cracks, or looseness; tighten hardware as needed.
5. If the cut quality is poor, replace the blade instead of over-sharpening a heavily worn one.

Most “engine problems” on walk-behind mowers are maintenance-related. Fresh fuel, a clean deck, and a straight, tight blade prevent hard starting, reduce vibration that can damage the crankshaft, and improve cut quality.

Last updated: February 2026

For the Craftsman model 917370770 walk-behind mower, we recommend high-quality detergent 4-stroke engine oil rated API SG-SL: use SAE 30 when operating above 32°F, and SAE 5W-30 when operating below 32°F (oil capacity is 20 oz). See the 917370770 owner's manual for the full lubrication chart.

• Above 32°F: SAE 30
• Below 32°F: SAE 5W-30
• Use detergent oil with API service classification SG-SL
• Fill to the proper mark; do not overfill
• Check oil level before starting and during long mowing sessions

The manual guidance for this mower is:

• Change engine oil every 25 hours of operation
• Change at least once per year even if you do not reach 25 hours

Using the correct viscosity helps your Briggs & Stratton 675 Series engine maintain proper lubrication as it heats up. Oil that is too thin in warm weather can increase consumption; oil that is too thick in cold weather can make starting harder.

• Run the engine briefly to warm the oil (it drains faster)
• Shut off the engine and disconnect the spark plug wire before servicing
• If you must tip the mower to drain oil, follow the tipping and fuel-handling steps in the 917370770 owner's manual

Last updated: February 2026

The model number for this Craftsman walk-behind mower is 917.370770 (often written without the dot as 917370770). You can confirm it on the product identification label and in the 917370770 owner's manual.

Check these common spots on Craftsman walk-behind mowers:

• On the rear of the mower deck near the discharge opening
• On the top of the deck near the engine mounting area
• Near the handle mounting brackets
• On a sticker or metal tag with the serial number
• In the first pages of the owner documentation

This mower uses a Briggs & Stratton engine, and the engine has its own separate model number. For this unit, the manual lists the engine model as 126T05-1070-B1.

Using the correct model number prevents ordering the wrong parts. Even small changes in deck design, self-propel drive hardware, or handle controls can change which blade, cable, or fasteners fit your Craftsman 917370770.

Last updated: February 2026

A strip of uncut grass (often called a “mohawk”) with your Craftsman 917370770 usually happens when the mower is cutting unevenly or the blade is not lifting grass into the cutting path. The most common fixes are overlapping passes, mowing slower, leveling wheel height, and sharpening or replacing the blade.

• Overlap your passes by a few inches; the manual recommends reducing the width of cut by overlapping in heavy grass.
• Slow your walking speed; moving too fast can leave grass pushed down before the blade can cut it.
• Set all wheels to the same height; uneven wheel heights are a top cause of poor, uneven cut.
• Raise the cutting height in tall or thick grass to prevent bogging and missed blades.
• Clean packed grass from under the deck; buildup changes airflow and cutting performance.

A worn, bent, or loose blade can leave a center strip because it cannot create enough lift to stand grass up for a clean cut.

Model-matched part to consider: If your blade is damaged or won’t hold an edge, replace it with the lawn mower 21-in deck mulching blade 532406706.

The 917370770 manual calls out a few habits that directly reduce striping and missed grass:

• Mow at FAST engine (blade) speed for best cutting and mulching action.
• In heavy grass, overlap the previous cut path and mow slowly.
• For best results, cut only the top one-third of the grass blade.
• Avoid mowing when grass is wet, since clumping interferes with cutting and mulching.

For more operating and mowing guidance specific to this mower, use the 917370770 owner’s manual.

A center strip is usually a sign of reduced blade lift or uneven deck height. Fixing it improves cut quality, reduces clumping, and helps prevent extra strain that can lead to loss of power or vibration.

Last updated: February 2026