How To Sharpen Lawn Mower Blades

How To Sharpen Lawn Mower Blades

Is your lawn mower tearing of​ the​ lawn grass blades instead of​ cutting it? Does your lawn look like it​ has been eaten by a​ goat,​ in​ spite of​ being cut by the​ lawn mower? Wait; do not pull your hair by the​ root. Help is​ at​ hand. we​ will teach you how to​ sharpen the​ lawn mower blades at​ minimum price and effort.

Your Manual Lawn Mower – the​ Faithful Walk Behinds

Tools: the​ tools that your will require for doing this job are

- You and your time of​ about 2 hours or​ less

- a​ bastard file of​ about 12” long

- a​ small crow bar to​ prevent movement of​ rotor of​ lawn mower.

- a​ worktable will be useful for dong the​ job comfortably.

Procedure: You can use the​ following procedure as​ a​ general guide and make changes to​ it​ to​ suit you. Remember the​ procedure is​ not sacrosanct. the​ results are important,​ not the​ procedure.

1. if​ possible,​ remove the​ handle of​ lawn mower and place lawn mower on​ the​ table.

2. Secure it​ if​ possible in​ the​ clamps. if​ you do not have clamps,​ do not bother,​ secure it​ against any block,​ so that the​ movement away from you is​ restricted.

3. Fix the​ crowbar in​ the​ blades so that it​ will not rotate

4. With the​ help of​ the​ bastard file,​ file the​ edges of​ blades so that they look sharp. Work at​ an​ angle of​ 45 degrees

5. When one blade is​ sharpened,​ remove the​ crowbar and turn the​ rotor to​ work on​ another blade. Repeat the​ procedure until all blades are sharpened.

6. if​ you have a​ flexible shaft grinder in​ your DIY workshop,​ you will be able to​ complete the​ work within 5 to​ 10 minutes per blade. Make a​ template of​ blade profile before you start your work and compare frequently. This is​ necessary to​ ensure that you do not over cut at​ a​ place.

Safety Tip For You

While sharpening the​ blades ensure that the​ stroke is​ not too long otherwise,​ you may injure yourself.

Sharpening Blades of​ Power Mower

Depending upon the​ lawn mower the​ procedure may vary. we​ have included general statements in​ this procedure; you would have to​ change the​ procedure slightly. Keep the​ maintenance manual of​ lawn mower handy if​ you have one.

Tools required.

- Siphon hose and clean container

- Heavy work gloves and goggles

- Double-cut (medium-rough) flat file

- Lumber scrap

- Socket wrench set

- Rubber mallet*

- Bench vise or​ C clamps

- Rotary blade sharpener accessory

- Electric drill*

- Screwdriver,​ or​ 1/4-in. rod or​ bolt*

- Blade balancer

- Replacement blade*

* Only if​ required

The list may look formidable,​ but tools are generally available with every DIY enthusiast.


The procedure is​ given for the​ simple single blade lawn mower,​ but the​ same will apply to​ all types of​ blades,​ whether single or​ double

- Wear hand gloves and clean the​ engine and the​ gasoline tank from outside

- Remove spark plug from the​ engine

- Remove all the​ fuel from the​ tank of​ the​ gasoline engine. Use the​ siphon hose so you do not spill gasoline on​ floor.

- Completely empty out the​ oil from gearbox if​ you have one

- Invert the​ engine and have access to​ the​ blade.

- Clamp the​ engine so it​ does not move and clean the​ blade area thoroughly

- With help of​ a​ box spanner,​ remove the​ nut holding the​ blade. Usually the​ nut will be unlocked in​ the​ reverse to​ direction of​ rotation of​ engine. You may engage the​ screwdriver in​ the​ cooling fan of​ engine to​ stop rotation of​ engine.

- if​ you find that you are using too much force to​ unlock the​ nut,​ put one or​ two drops of​ rust removing chemical,​ and try after 30 minutes

- After you remove the​ blade,​ clamp it​ in​ the​ bench vise and sharpen it​ with a​ file or​ a​ grinder. Sharpen only the​ outer 2 to​ 3 inches. the​ area to​ be sharpened will be known if​ you see the​ blade.

- Sharpen only to​ the​ required extent. Too much sharpening is​ not necessary. This is​ not the​ knife. it​ works at​ the​ speed of​ the​ engine

- After sharpening,​ check with your thumb. Be careful not to​ cut thumb. if​ you have done sharpening before,​ or​ seen some one doing it,​ you will know what we​ mean by this.

- Balance the​ blade with help of​ a​ small balancing tool on​ VEE blocks,​ or​ even on​ two foot rulers placed side by side

- Refit the​ blades,​ refill engine oil and gasoline and test the​ sharpness of​ blades on​ uncut portion of​ your lawn

Safety tips:

- Always use safety goggles and hand gloves when working with power tools.

- Be sure to​ remove the​ spark plug before starting. Serious accidents can happen if​ you do not do this.

How To Sharpen Lawn Mower Blades

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