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How do i sharpen cylinder mower blades

How do i sharpen scottbonnar cylinder mower blades

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I believe you mean to say a 'reel' mower. Normally and old fashoined push (non-engine powered) mower.

Most consumer reel mowers do not need to be sharpened. They do however have a knife bed that occasionally needs to be adjusted. It should have the thickness of a regular piece of notebook paper between the blades and the knife bed. (that is really VERY close) You can buy 'lapping compound' from an automotive parts store, and apply that to the bed knife, and then rotate the blades to provide a precise fit for all blades.

Commercial reel mowers, such as those used on golf course equipment are however sharpened normally once or twice a year. It requireds dismantling, and many courses send their blades to a central location for golf equipment, where they are placed on a computer operated sharpener for precision grinding. This cost several hundreds of dollars just for the grinding.

Posted on Nov 12, 2009

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The spiral blades can be sharpened by "back-lathing" them on the knife bed, and I saw several how-to articles but don't have the required 1/2" drill. I found a much simpler solution. Use a screwdriver to pop the cover and remove the circlip. Slide the wheel off and remove the smaller gear inside. You will see the cavity inside pushes a flat pin back and forth allowing the wheels to spin freely in one direction and engage in the other. I used my vise to break a large nail just short enough to fit where the slide pin was, so the wheels engage both directions. Do this on both sides. Tighten the blade bed down until the blades are difficult to turn. Now you can put some lath compound on the bed and push it around on pavement in reverse until the reel blade edges are shiny. Loosen the blade bed and replace the nail pieces with the original pins in the same orientation they were (make sure the wheels engage when forward and spin free in reverse, it will be obvious if you get them in backwards). Adjust your blade bed so it works like scissors (with very little resistance) The reel should spin easily but very close to touching the blade bed.

Posted on Sep 22, 2014


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Ihave a craftsman ridding mower model #917.289900 new belt for the deck new blads it still leaves miss cut in the middle anybody know why?

usually if its missing cut it's not rotating fast enough, or the other thing it can be the blades have not been sharpened. some companies that make blades don't sharpen them so they can be handled, it will have a leading edge and you need a sharpening stone to put a cutting edge on the blade. and the blade has to be put in the right way round. flate top cutting edge bottom.

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Sharpening blades for qualcast 35s

With a cylinder mower the sharpness of the blade is only part of the concern. The fixed blade is like one of the blades of a pair of shears and each "blade" of the revolving cylinder acts as the other.

As long as only grass is being cut (no stones) the blades will last a long time with only occasional adjustment to the fixed blade as per instruction manual.
After much use or in case of damage the fixed blade will need replacing or sharpening. If it is badly worn it will need removing and sharpening by a specialist with the correct equipment but otherwise the light application of a file, stone or a patent sharpener and then readjust the blade per manual.

When eventually the cylinder becomes worn or sustains damage it must be removed and machine trued and sharpened using a lathe or similar.

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Most have a bolt holding them on. Hold blade and remove bolt. When installing them, most have indents or pin for proper aleignment

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Hi There The cutting deck is not cutting properly, is worn out and needs replaced

Have you sharpened the blades? They must be sharpened regularly.
Also, the deck should be level left to right and be slightly lower in the front of the mower.
Ensure that the blade is installed with the sharp edge closer to the ground when installed on the mower.

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I've never worked on one but it should be similar to a gas driven one. There should be a bolt or screw holding the blade to the shaft. Just unbolt or unscrew it, sharpen it and reinstall. Good luck...Lee

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