How often should you change your edger blade?
For a Craftsman lawn edger model 536797570, replace the edger blade when it’s worn, bent, cracked, or no longer holds an edge after sharpening. In normal homeowner use, that typically means once per season, but heavy edging in sandy soil can require replacement sooner.
- Replace immediately if the blade is cracked, missing chunks, or visibly warped.
- Replace when the cutting edge becomes too narrow to sharpen safely.
- Replace if the edger starts bouncing, vibrating, or leaving a ragged trench.
- Replace sooner if you edge along concrete frequently (faster wear).
- Replace sooner if you edge in gravelly or sandy soil (abrasive wear).
A new edger blade has a consistent profile and a straight cutting edge. As it wears, the blade diameter shrinks and the edge gets thin and rounded.
| Condition | What you’ll notice | What to do |
|---|---|---|
| Normal dulling | Takes more passes, throws less soil | Sharpen the blade |
| Heavy wear | Edge is thin, blade is noticeably smaller | Replace the blade |
| Damage | Cracks, bends, chips, wobble | Replace the blade now |
A worn blade makes the engine work harder, increases vibration, and produces uneven edging. Replacing the blade at the right time improves cut quality and helps protect wear items like the carburetor and starter components.
If the edger has been sitting and won’t start after blade service, fuel system parts often need attention. Common tune-up items we see on this model include the carburetor rebuild kit 632592 and the carburetor primer bulb 36045A. You can order these and other replacement parts from the parts list for model 536797570, or search by model number on Sears PartsDirect.
Last updated: February 2026
What engine is on a Craftsman edger?
For the Craftsman lawn edger model 536797570, the exact engine make and displacement depend on the engine installed on your unit (many edgers in this series use a small 4-cycle gasoline engine). We match the correct engine parts by using the model number and the engine’s ID tag information.
Look on the engine itself (not the edger frame) for an ID label or stamping. Common locations include the blower housing, valve cover area, or near the muffler.
- Find the engine brand (often Briggs & Stratton, Tecumseh, or similar)
- Record the engine model/type/code (or model/spec numbers)
- Compare those numbers to the parts diagrams for your edger
- If the edger runs poorly, check fuel system parts first (primer bulb, float bowl, needle seat)
- Use the engine ID to avoid ordering the wrong carburetor or starter parts
If you are troubleshooting starting, surging, or fuel leaks, these model-linked parts are common service items:
- Primer 36045A (helps prime fuel for cold starts)
- Needle seat 631021B (controls fuel flow into the carburetor bowl)
- Craftsman lawn and garden engine carburetor rebuild kit 632592 (typical fix for varnish, flooding, or lean running)
- Starter housing 590687B (starter assembly housing if recoil mechanism binds)
- Craftsman lawn & garden equipment engine recoil starter rope, 98-in 590535 (frayed or broken pull rope)
| Symptom | Most likely area | Parts on this page that often help |
|---|---|---|
| Won’t start cold | Priming/fuel delivery | Primer bulb, needle seat, carb rebuild kit |
| Gas smell or leaking | Carburetor bowl/float | Float bowl, float, needle seat |
| Pull cord won’t retract | Recoil starter | Starter rope, starter housing |
Craftsman edgers can share the same edger model number while using different engine variants over production runs. Confirming the engine ID prevents mismatched carburetor and starter parts, and it speeds up repairs.
You can order replacement parts for your Craftsman 536797570 from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
How to replace the blade on an edger?
To replace the blade on your Craftsman edger model 536797570, disconnect the spark plug wire, tip the edger safely, then remove the blade nut and hardware. Many edgers use a reverse-thread blade nut, so you loosen it by turning clockwise; install the new blade and tighten securely.
- Shut the engine off and let it cool completely.
- Pull the spark plug wire off the plug so the engine cannot start.
- Work on a flat surface; block the wheels so the edger cannot roll.
- Wear heavy gloves; edger blades are sharp even when “dull.”
- Tip the edger with the carburetor and air filter facing up to reduce fuel leakage.
- Stabilize the edger and access the blade area.
- Hold the blade from turning (use a block of wood against the blade if needed).
- Remove the blade nut and any washer(s) or spacer(s).
- Slide the old blade off.
- Install the new blade in the same orientation as the old one.
- Reinstall washer(s) and nut; tighten firmly.
- Reconnect the spark plug wire and test run.
Use this quick check so the blade sits flat and does not wobble.
| Item | What to verify | What happens if wrong |
|---|---|---|
| Blade direction | Matches the original blade orientation | Poor edging, vibration |
| Washers/spacers | Reinstalled in the same order | Blade wobble, loosening |
| Nut threading | Reverse-thread is common; loosen clockwise | Stripped threads, stuck nut |
A correctly installed blade cuts cleaner and reduces vibration, which protects the spindle, fasteners, and engine components on your Craftsman 536797570.
If you notice fuel seepage, hard starting, or degraded rubber while you are servicing the edger, these parts are commonly replaced on small engines:
- Craftsman lawn and garden engine carburetor rebuild kit 632592
- Primer 36045A
- Craftsman lawn & garden equipment engine recoil starter rope, 98-in 590535
You can order replacement parts for your Craftsman 536797570 from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
