Craftsman 172.79957 User's Manual | Page 10

Craftsman Trimmers User's Manual - 172.79957.
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19

18

OIL

MAINTENANCE

MAINTENANCE cont.

      

WARNING: Your hedge trimmer should NEVER be connected to the 

power source when you are assembling parts, making adjustments, oiling 

blades, cleaning or when it is not in use. Disconnecting the trimmer will prevent 

accidental starting, which could cause serious personal injury,

!

      

WARNING: Do not at any time let brake fluids, gasoline, petroleum-based 

products, penetrating oils, etc., come in contact with plastic parts. Chemicals 

can damage, weaken or destroy plastic which may result in serious 

personal injury.

!

      

WARNING: To avoid injury, ALWAYS turn off 

and disconnect the trimmer from the power outlet 

BEFORE installing parts, cleaning the trimmer or 

making any adjustments.

!

      

CAUTION: ALWAYS make sure you support the weight of the hedge 

trimmer by setting it down on a flat, dry surface when you are clamping the

blade assembly in a vise.

!

LUBRICATING THE BLADE (Fig. 10)

For efficient operation and longer blade life, always clean and lubricate the hedge trimmer 

blade before and after each use. Before lubricating, be sure the unit is turned OFF and 

unplugged from the power supply. Apply a premium light machine oil along the edge of 

the top strap (see Fig. 10).

      

WARNING: To avoid injury, ALWAYS turn off and disconnect the trimmer 

from the power outlet BEFORE installing parts, cleaning the trimmer or making 

any adjustments.

!

      

CAUTION: Some spray-on lubricants contain solvents and will cause 

some types of grease to break down. To prevent damage to the unit, only use 

a quality machine oil.

!

Periodic maintenance allows for long life and trouble-free operation. A cleaning and 

maintenance schedule should be maintained. As a common preventive maintenance 

practice, follow these recommended steps:
 1.  When work has been completed, always clean and oil the cutting blades, and clean 

      the tool to allow smooth functioning of the tool over time. Also keep the air vents free 

      of obstructions. 
 2.  Clean the tool with a small brush. Wipe off any moisture with a soft cloth. 
 3.  Keep the motor air openings free from oil, grease, leaves, stems or woodchips, 

      and store tool in a dry place.

SHARPENING AND REMOVING NICKS FROM THE BLADES (Fig. 9)

3. Clamp the blade support cutting bar assembly in a vise 

    and make sure you support the weight of the motor housing 

    and rear handle on a flat surface. File the exposed cutting 

    surface of the damaged blade tooth with an 8-inch fine 

    round file, having a 1/4 or 7/32-inch diameter. Be sure to 

    retain the tooth’s original angle when filing to sharpen or 

    to remove nicks.

The cutting blades are made from high quality, hardened 

steel and with normal usage, they will not require re-sharpening. 

However, if you accidentally hit a wire fence, stone or brick wall 

or some other hard objects, you may put a nick in the blade. 

There is no need to remove the nick as long as it does not

interfere with the movement of the blade’s dual action. 

To remove nicks or sharpen the blades, follow these 

recommended steps:
1. Allow the hedge trimmer to come to a stop with the upper

    cutting blades and lower blades positioned as shown 

    in Fig. 9. This will allow clearance for the file between

    the upper cutting teeth and the lower teeth.
2. Disconnect the trimmer from the power supply.

4. Remove the hedge trimmer from the vise, connect to power, restart trimmer to expose 

    any other part of the cutting blade you need to file, stop trimmer, and disconnect trimmer 

    from the power supply. 

5. Repeat the above process of filing and moving the blade teeth until you have removed the 

    nick and sharpened the tooth.

SHARPENING AND REMOVING NICKS FROM THE BLADES cont. (Fig. 9)

Fig. 10

Fig. 9

Oil along edge of Blade Support Bar

Lower

Cutting

Blade

Upper

Cutting

Blade

Blade

Support

Cutting 

Bar

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