1. Introduction
The ABUS MT90 mechanical door opener is designed for reliable and secure door operation without the need for electrical installations or access control systems. Its compact design and robust construction make it suitable for various applications.
This mechanical door opener is compatible with both DIN right and DIN left doors, offering versatility in installation. It features a small installation width of only 16mm, a radius case, and includes latch adjustment with a mechanical unlocking mechanism. It is ideal for objects without existing access control or electrical infrastructure.
2. Safety Information
- Read all instructions carefully before attempting installation or use.
- Ensure proper tools are used for installation to prevent damage to the product or injury.
- Do not modify the product in any way, as this may compromise its functionality and safety.
- Keep the product and its components out of reach of children.
- Always test the door opener's function after installation to ensure correct operation.
3. Package Contents
Verify that all components are present before beginning installation:
- 1 x ABUS MT90 Mechanical Door Opener (Model 58391)
- Mounting Screws (typically included)
- Instruction Manual
4. Setup and Installation
The ABUS MT90 is designed for straightforward installation on both DIN right and DIN left doors. Follow these steps for proper mounting:
- Prepare the Door Frame: Identify the mounting location on your door frame. The compact design (16mm width) allows for flexible placement. Ensure the surface is clean and stable.
- Mark Screw Holes: Position the door opener in the desired location and use a pencil to mark the positions for the mounting screws.
- Drill Pilot Holes: If necessary, drill pilot holes at the marked positions. Ensure the drill bit size is appropriate for the mounting screws to prevent splitting the wood or damaging the frame.
- Secure the Door Opener: Attach the door opener to the door frame using the provided screws. Ensure it is mounted securely and flush with the frame.
- Adjust the Latch: The MT90 features a latch adjustment mechanism. Carefully adjust the latch to ensure proper engagement with the door's bolt when the door is closed. This may require minor adjustments to achieve smooth operation and secure locking.
- Test Operation: Close and open the door several times to verify that the door opener functions correctly. Ensure the latch engages smoothly and the door remains securely closed.

Image: The ABUS MT90 Mechanical Door Opener, illustrating its compact size with a length of approximately 3.0 inches (7 cm), which is crucial for installation planning.

Image: A detailed front view of the ABUS MT90 Mechanical Door Opener, highlighting its robust metal construction and the integrated latch mechanism.
5. Operating Instructions
The ABUS MT90 operates purely mechanically. When the door closes, the door's latch bolt engages with the opener's mechanism, securing the door in the closed position.
To open the door, simply turn the door handle. The mechanical action of the handle will retract the door's latch bolt, allowing it to disengage from the door opener and the door to open. The integrated mechanical unlocking feature ensures smooth and reliable operation.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your ABUS MT90 Mechanical Door Opener:
- Inspection: Periodically inspect the door opener for any signs of wear, damage, or loose components.
- Cleaning: Clean the unit with a soft, dry cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish or internal mechanisms.
- Fasteners: Ensure all mounting screws remain tight. Loose screws can affect the door opener's alignment and functionality.
- Lubrication: If the mechanism feels stiff over time, a small amount of silicone-based lubricant can be applied to moving parts, if recommended by ABUS. Avoid oil-based lubricants that can attract dust and debris.
7. Troubleshooting
If you encounter issues with your ABUS MT90, refer to the following troubleshooting guide:
| Issue | Possible Cause | Solution |
|---|---|---|
| Door does not close properly or latch does not engage. | Misalignment of the door opener or door latch. Obstruction in the door frame. | Check for any physical obstructions. Verify the alignment of the door opener with the door's latch bolt. Adjust the latch mechanism as described in the installation section. |
| Door opener feels stiff or difficult to operate. | Accumulation of dirt or debris. Lack of lubrication. | Clean any visible dirt or debris from the mechanism. If necessary, apply a small amount of silicone-based lubricant to moving parts. |
| Door opener is loose on the frame. | Loose mounting screws. | Tighten all mounting screws securely. Do not overtighten. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | 58391 |
| Installation Type | Screw-In |
| Recommended Uses | Opening DIN-right and DIN-left doors, for objects without access control or electrical installations |
| Specification Met | DIN |
| Manufacturer | ABUS |
| Item Weight | 4.9 ounces (0.14 Kilograms) |
| Package Dimensions | 3.54 x 1.57 x 0.87 inches |
| Style | Single |
| Item Package Quantity | 1 |
| Batteries Included/Required | No |
| Material | Metal |
| Color | Grau (Grey) |
| Exterior Finish | Silber (Silver) |
9. Warranty and Support
For detailed warranty information, technical support, or to inquire about replacement parts, please refer to the official ABUS website or contact ABUS customer service directly. You can also visit the ABUS Store on Amazon for more product information.





