Owner’s manual
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What size is the nut on a Craftsman riding mower blade?
On the Craftsman 917204070 riding mower, the blade fastener is typically removed with a 15/16-inch socket or wrench (commonly a 5/8-18 blade nut). For the most accurate hardware callout for your exact deck setup, confirm the blade mounting details in the Craftsman 917204070 owner's manual.
Quick way to confirm before you buy tools
We recommend checking the blade nut size on your tractor directly because rust, paint, and packed grass can change the “feel” of the fit.
- Park on a flat surface, set the parking brake, and remove the key
- Block the rear wheels; let the engine and muffler cool
- Raise the deck to its highest position for access
- Clean the nut and spindle threads with a wire brush
- Test-fit a 15/16-inch socket; it should seat fully with minimal play
- If it rounds easily, stop and use a 6-point socket (not 12-point)
Common blade nut sizing (what you will see most often)
Most Craftsman and Husqvarna-built lawn tractor decks use a blade nut that matches a 15/16-inch hex, but always verify on the machine.
| What you are checking | Typical spec | What to use |
|---|---|---|
| Blade nut thread | 5/8-18 | Match nut to spindle threads |
| Hex size for removal | 15/16 in. | 6-point socket/wrench |
| Direction | Standard right-hand on most decks | Loosen counterclockwise |
Why it matters
Using the correct socket size helps prevent rounding the blade nut, damaging the mandrel (spindle) threads, and turning a routine blade change into a mandrel repair. If you find wobble, noise, or rough blade rotation while you are under the deck, inspect the spindle area and consider the lawn tractor mandrel housing 587819701.
Last updated: February 2026
What kind of oil do you use in a Craftsman lawn tractor?
For Craftsman lawn tractor model 917204070, we use high-quality detergent 4-cycle engine oil rated API SJ-SN; choose SAE 30 for temperatures above 32°F (0°C) and SAE 5W-30 for temperatures below 32°F (0°C). See the 917204070 operator’s manual for the full lubrication chart and service intervals.
Oil type and capacity for model 917204070
Use oil that meets API service classification SJ-SN and match viscosity to outdoor temperature.
- SAE 30: best for warm-weather mowing (above 32°F)
- SAE 5W-30: best for cold-weather starting (below 32°F)
- Avoid running low; check oil before each use and about every 8 hours of operation
- Change oil about every 50 hours of operation (or at least annually)
- Oil capacity is typically 64 oz (with filter) or 60 oz (without filter)
| Outside temperature | Recommended viscosity | What you will notice |
|---|---|---|
| Above 32°F (0°C) | SAE 30 | Stable protection in heat, normal consumption |
| Below 32°F (0°C) | SAE 5W-30 | Easier starting in cold weather |
Tips to prevent oil-related engine problems
Multi-viscosity oils can increase oil consumption in warm weather, so we check the level more often when using 5W-30 above 32°F.
- Park on level ground before checking the dipstick
- Wipe dipstick, reinsert fully, then read level
- Do not overfill; overfilling can cause smoking and rough running
- Use a clean funnel and keep dirt out of the fill tube
- Replace the oil filter when doing a “with filter” oil change
Why it matters
Correct viscosity helps your 4-cycle engine stay lubricated across temperature swings; it reduces wear during cold starts and helps prevent overheating and accelerated engine wear during summer mowing.
Last updated: February 2026
How wide is a 42 in riding lawn mower?
A “42-inch” riding lawn mower refers to a 42-inch cutting deck width, not the tractor’s overall outside-to-outside width. Most 42-inch deck tractors measure about 48 to 55 inches wide overall (varies by tire size, deck design, and discharge chute). For your Craftsman 917204070, confirm the exact deck size and clearances in the 917204070 owner's manual.
What “42-inch” actually means
A 42-inch mower is sized by the cutting path of the blades under the deck.
- Deck width (cutting width): 42 inches
- Overall width: typically wider than 42 inches
- Why wider: deck shell overhang, anti-scalp wheels, and the side discharge chute
Typical widths you can plan around
Use these common planning numbers for gates, sheds, and trailer ramps.
| Measurement you need | Typical for a 42-in deck tractor | What affects it most |
|---|---|---|
| Cutting width | 42 in | Blade span and deck design |
| Overall width (chute up/removed) | ~48 to 52 in | Tire track width, deck shell |
| Overall width (with chute installed) | ~52 to 55 in | Discharge chute size |
How to measure your mower correctly
If you need a precise number for storage or transport, measure the tractor you own.
- Park on level ground, set the parking brake, and shut the engine off
- Measure outside of left tire to outside of right tire (tractor width)
- Measure widest point of the deck (often the discharge side)
- If the chute is installed, measure to the outer edge of the chute
- Compare your measurements to the deck information in the 917204070 owner's manual
Why it matters
Overall width determines whether your mower fits through a gate, into a shed, or onto a trailer. Planning by “42-inch” alone often leads to clearance problems because the deck and chute add several inches.
Last updated: February 2026
How to find Craftsman product date code?
On a Craftsman product, the date code is typically stamped, printed, or engraved on the product label or molded into the plastic housing. For the Craftsman lawn tractor model 917204070, the most reliable place to confirm identification markings and label locations is the 917204070 operator’s manual.
Where to look for a date code (common locations)
Check these spots first; use a flashlight and wipe off dirt or oil so the characters are readable:
- Under the seat area (frame or fender pan label)
- On the mower deck shell (top surface near the discharge chute or belt cover)
- On the engine shroud or valve cover area (engine label is often separate from the tractor label)
- Near the battery tray or behind the dash panel
- On attachments and consumables (battery, charger, belts) as a stamped or inked code
What the code usually looks like
Date codes are not always labeled “date”; they can look like a short string of numbers/letters.
| Item type | What you’ll often see | Typical meaning |
|---|---|---|
| Battery | 6-digit numeric code | Often a month/day/year style code or a factory date stamp |
| Charger/electrical module | Printed code on the bottom | Manufacturing date or lot code |
| Tractor frame/deck | Model/serial label plus a smaller code | Production/lot information tied to the serial |
Tips to avoid mix-ups
It’s common to find multiple codes on a riding mower because the tractor, engine, and battery are dated separately.
- Record the model number and serial number from the tractor label first
- Compare the tractor label to the engine label; they will not match
- If the code is faint, rub chalk over it and wipe lightly to highlight characters
- Take a clear photo before cleaning solvents remove inked markings
Why it matters
The date code helps you match the correct Craftsman parts (belts, blades, electrical switches) and confirm compatibility when ordering maintenance items for the 48-inch deck and starting system.
Last updated: February 2026
