The Masport Lawn Marshal ST S18 takes the Masport Quick Cut 460mm blade and bolt pack 780658 (2 blades) as its blade; Australian sellers list it from A$13.00 as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your lawn mower
Masport Lawn Marshal ST S18
Lawn mower
Confirmed against Masport's listConfirmed against Masport's own compatibility list
Not yours? ChangeTakes the 780658 blade
Quick Cut 460mm blade and bolt pack 780658 (2 blades) · check the code on your old part before ordering.
Takes 2 Quick Cut blades on its blade carrier: one pack of 780658 (2 blades with bolts) does the job.
Your lawn mower
Lawn mower
Confirmed against Masport's listConfirmed against Masport's own compatibility list
Takes the 780658
Blade · check the code on your old part.
Takes 2 Quick Cut blades on its blade carrier: one pack of 780658 (2 blades with bolts) does the job.
Other Masport lawn mowers that take the 780658
GenuineGenuine Masport
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No genuine seller tracked yetNo genuine seller tracked yet
CompatibleCompatible option
$13.00
Mower Merch · 28 OctMower Merch · checked 28 Oct
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Genuine: made by Masport. Compatible: another brand.Genuine is made by Masport. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $13.00
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Compatible options
1 seller
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How long it lasts
Replace it when the blades or bolts are worn or damaged, in sets so the cutter stays balanced, Masport says; check them before each use and whenever the mower hits something or starts to vibrate.
After replacing: No reset needed.
How to change the blade in your Masport Lawn Marshal ST S18
Watch the guide or follow the steps.
- 1Stop the engine and wait for the blade to stop, then remove the spark plug lead and keep it away from the plug. Wear protective gloves.
- 2Drain the fuel, then tilt the mower with the spark plug uppermost, as the engine book says.
- 3Undo the blade centre bolt and take the blade carrier (disc) off the mower, noting where each part goes.
- 4Undo the tip mounting bolts and fit the new blades with the new bolts, washers and nuts from the set. Replace all the blades on the carrier together.
- 5Refit the carrier so its slots sit over the lugs and the drive plate; replace the mounting bolts if they are worn. Tighten the tip bolts to 20-25 Nm and the centre bolt to 45-50 Nm.
Every number this part goes by
- Retail name:
- 780658
Sellers list any of these; they are the same part.
About your Masport Lawn Marshal ST S18
Masport lawn mower — Lawn Marshal (Series 18). Its blade is the Quick Cut 460mm blade and bolt pack 780658 (2 blades), part 780658.
Where the model number is: The model is on the label on the mower's deck or handle. Disconnect the spark plug lead, or take the battery or safety key out, before you tip the mower: the blade is sharp.
Fits these 2 Masport models
Masport2 models
Takes 2 Quick Cut blades on its blade carrier: one pack of 780658 (2 blades with bolts) does the job.
Common questions
- Which blade fits the Masport Lawn Marshal ST S18?
- The Masport Lawn Marshal ST S18 takes the Masport Quick Cut 460mm blade and bolt pack 780658 (2 blades). Takes 2 Quick Cut blades on its blade carrier: one pack of 780658 (2 blades with bolts) does the job.
- Where can I buy the 780658 in Australia?
- We track 1 Australian seller for the 780658; the lowest listed price when we last checked was A$13.00 at Mower Merch. Prices are re-checked daily and dated on this page.
- How do I fit the 780658 in a Masport Lawn Marshal ST S18?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A blunt blade tears the grass tips, which then brown, and a bent blade makes the mower vibrate and wears the engine or motor.
- Is there anything to reset afterwards?
- No reset needed.
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