Product Overview
The BLACK+DECKER 3-in-1 electric lawn mower, string trimmer, and edger (Model MTE912) is a versatile tool designed for maintaining small to medium-sized yards. Its compact design allows for easy conversion between mowing, trimming, and edging functions, providing efficient and consistent performance for areas up to 750 sq. ft. or those with challenging access.

Figure 1: Overall view of the BLACK+DECKER MTE912 3-in-1 electric lawn mower, string trimmer, and edger.
Product Features
- 3N1 DESIGN: Electric mower easily converts to string trimmer and edger via a built-in foot pedal for versatile use.
- 6.5 AMP MOTOR: Supplies the ideal amount of power when trimming grass, weeds, and overgrowth.
- GEAR DRIVE TRANSMISSION: For tackling tougher, thicker grass without getting bogged down.
- AFS AUTOMATIC FEED SPOOL: Continuously feeds trimmer line without bumping for seamless, uninterrupted trimming.
- ADJUSTABLE MOWER DECK AND TRIMMER HANDLE: Lawn mower deck and string trimmer handle are adjustable for ideal grass-cutting height and added comfort.
- CORDED: Corded design offers unlimited runtime for even the biggest jobs.

Figure 2: Key features of the MTE912, including its lightweight design, adjustable handle, gear drive, and 3-in-1 conversion capability.
Included Components
The BLACK+DECKER MTE912 package includes the following components:
- (1) GH912 trimmer/edger
- (1) MTD100 detachable mower deck
- (1) AF-100 spool
- (1) auxiliary handle
- (1) guard
- Operating Instructions
Setup
Before operating your BLACK+DECKER 3-in-1 tool, ensure all components are properly assembled and secured. An extension cord (not included) is required for operation.
- Attach Auxiliary Handle: Secure the auxiliary handle to the trimmer shaft for comfortable two-hand operation.
- Install Guard: Attach the guard to the trimmer head to protect against debris.
- Insert Spool: Ensure the AF-100 spool is correctly installed in the trimmer head.
- Adjust Trimmer Handle: Adjust the trimmer handle to a comfortable height for your use.
- Attach to Mower Deck (Optional): To use as a lawn mower, align the trimmer with the MTD100 detachable mower deck and press down firmly until it clicks into place. Use the integrated foot pedal to release the trimmer from the deck when converting modes.
- Adjust Mower Deck Height: The mower deck height can be adjusted to your desired cutting level.
- Connect Power: Plug a suitable outdoor extension cord into the tool and then into a power outlet.

Figure 3: The 3-in-1 design allows for easy conversion between modes. Here, the trimmer is detached from the mower deck.

Figure 4: The adjustable handle and shaft ensure comfortable use for various user heights.
Operating Instructions
The BLACK+DECKER MTE912 offers three distinct operating modes: lawn mowing, string trimming, and edging.
Lawn Mowing Mode
Attach the trimmer to the mower deck. Push the unit across your lawn in overlapping passes, similar to a traditional lawn mower. The wheels on the deck ensure an even cut.

Figure 5: Operating the MTE912 in lawn mowing mode for an even cut.
String Trimming Mode
Detach the trimmer from the mower deck. Hold the trimmer comfortably and use a sweeping motion to cut grass and weeds around obstacles, fences, and garden beds. The AFS AUTOMATIC FEED SPOOL will automatically feed new line as needed.

Figure 6: The AFS Automatic Feed Spool ensures continuous trimming without manual adjustments.
Edging Mode
For precise edging along sidewalks and driveways, rotate the trimmer head 90 degrees. The built-in guide wheel helps maintain a consistent cutting depth for clean edges.
Maintenance
Regular maintenance ensures optimal performance and extends the life of your BLACK+DECKER MTE912.
- Cleaning: After each use, disconnect the power cord and clean the tool. Remove any grass clippings, dirt, or debris from the trimmer head, guard, and mower deck. Use a damp cloth; do not use harsh chemicals or abrasive cleaners.
- Line Replacement: When the trimmer line runs out, replace it with a new AF-100 spool. Refer to the user guide for detailed instructions on spool replacement.
- Storage: Store the tool in a dry, secure location away from children. The trimmer can be detached from the mower deck for compact storage.
Troubleshooting
If you encounter issues with your BLACK+DECKER MTE912, refer to the following common troubleshooting tips:
- Tool Does Not Start: Ensure the power cord is securely plugged into both the tool and a working outlet. Check if the circuit breaker has tripped.
- Trimmer Line Not Feeding: Verify that the AF-100 spool is correctly installed and not tangled. Ensure the line is not jammed or broken.
- Uneven Cutting: Check the mower deck height settings and ensure they are appropriate for the grass height. Clear any debris from the cutting area.
- Excessive Vibration: Inspect the trimmer head and line for any damage or imbalance. Ensure all components are securely fastened.
For more detailed troubleshooting, consult the full User Guide PDF.
Specifications
| Attribute | Value |
|---|---|
| Brand | BLACK+DECKER |
| Power Source | Corded Electric |
| Color | Black/Red |
| Item Weight | 10.2 Pounds |
| Cutting Width | 12 Inches |
| Product Dimensions | 36.56"L x 15.31"W |
| Assembly Required | Yes |
| Style | 3-in-1 Mower Only |
| Material | Plastic |
| Voltage | 120 Volts |
Warranty Information
The BLACK+DECKER MTE912 comes with a 2-year limited warranty. Please retain your proof of purchase for warranty claims. For full details on warranty coverage and terms, refer to the official user guide or contact BLACK+DECKER customer support.
Support & Resources
For additional support, detailed instructions, or to download the complete user guide, please use the link below:





