Tools / Impact Wrenches
Craftsman 20-inch 4.2 Amp Electric Hedge Trimmer
Quick guide for the Craftsman 20-inch 4.2 Amp Electric Hedge Trimmer (Model 172.797740). Learn how to safely operate, maintain, and use your trimmer for best results.
Quick answers from the manual
Quick answer
- The Craftsman 172.797740 is a 20-inch electric hedge trimmer. It requires a 120V AC power source and should be used with a GFCI outlet. Always use both hands to operate and wear appropriate safety gear. p. 1, 6
Key actions
- Starting the trimmer p. 7
- Lubricating blades p. 9
First start
- Secure extension cord using the cord retainer on the rear handle. p. 7
Problems and fixes
Blade stalls
Stop immediately, disconnect from power, and clear jammed debris.
p. 8Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Blade Length | 20-inches | Cutting reach | p. 6 |
| Speed | 1800 SPM | Strokes per minute | p. 6 |
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
This hedge trimmer is designed for trimming hedges and bushes. Before use, ensure you have a 120V AC power source and a GFCI-protected outlet. Always wear eye protection, gloves, and sturdy footwear. Never operate the trimmer with one hand; always use both hands on the handles. Keep the power cord behind the trimmer at all times to avoid cutting it.
Description
The Craftsman 20-inch Electric Hedge Trimmer features a 4.2 Amp motor and a 20-inch steel cutting blade. It includes a dual cutting action to minimize vibration and a bubble level to assist in achieving flat, even cuts. The unit is lightweight and ergonomically designed for comfort.
Assembly
The trimmer comes fully assembled. The primary setup task is securing the extension cord to prevent accidental disconnection. Form a loop with the extension cord, insert it through the opening in the bottom of the rear handle, and place it over the cord retainer. Pull the loop back to remove slack before plugging it into the power source.
Operation
To start the trimmer, slide the lock-off button back and squeeze the trigger switch. The trimmer will run as long as the trigger is held. To stop, release the trigger switch. Note that the blades will coast for a few moments after the switch is released.
Cutting Techniques:
- Top Cutting: Use a wide sweeping motion with a slight downward tilt of the blades. Use the built-in bubble level to keep the blade level to the ground.
- Side Cutting: Begin at the bottom and cut upwards, tapering the hedge inward at the top for uniform growth.
Maintenance
Regular maintenance ensures the longevity of your tool. Always disconnect the power before performing any maintenance.
- Cleaning: Use a soft brush to remove debris from air intakes and the cutting blade. Wipe plastic surfaces with a soft, dry cloth. Never use water or chemicals.
- Lubrication: Apply oil between the two blades before and after each use. Stop occasionally during extended use to re-oil.
- Storage: Store in a secure, dry place out of the reach of children. Use the hanging slot for wall storage.
Manufacturer information
CRAFTSMAN
Practical help
Common problems
Trimmer does not start
Check power supply, ensure GFCI is not tripped, and ensure both the lock-off button and trigger switch are fully engaged.
Blade stalls during operation
Stop immediately, disconnect from power, and remove jammed debris from the cutting blade.
Before use
- Inspect the area for foreign objects like wires or fences
- Check the extension cord for damage
- Wear eye protection, gloves, and appropriate clothing
- Ensure the blade is sharp and clean
- Verify that all nuts and bolts are secure
Specs in practice
- 4.2 Amp Motor
- Provides power for cutting branches up to 5/8-inch in diameter.
- Dual Cutting Action
- Helps minimize vibration and provides faster cutting.
Images and diagrams
- Cord retainer: Loop the extension cord and secure it through the rear handle opening to prevent the plug from pulling out.
Model compatibility
- Requires 120V, 60Hz AC power supply.
- Use only with GFCI protected outlets.
- Use extension cords rated for outdoor use.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.