Introduction
Thank you for choosing the Maclean MC-137 Triple Monitor Mount. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your monitor mount. Please read these instructions carefully before assembly and retain them for future reference.
The Maclean MC-137 is designed to support three monitors ranging from 17 to 27 inches, with a maximum weight capacity of 8 kg per monitor. It features gas spring arms for effortless height adjustment, full motion articulation including tilt, swivel, and rotation, and integrated cable management to maintain an organized workspace.
Safety Information
- Weight Capacity: Do not exceed the maximum weight capacity of 8 kg per monitor. Exceeding this limit may result in instability and potential injury.
- Monitor Size: This mount is designed for monitors between 17 and 27 inches.
- VESA Compatibility: Ensure your monitors are VESA compatible (75x75mm or 100x100mm).
- Assembly: Assemble the product according to the instructions. Improper assembly may cause damage or serious personal injury.
- Mounting Surface: Ensure the mounting surface (desk) is strong enough to support the combined weight of the mount and all attached monitors.
- Moving Parts: Keep hands and fingers clear of moving parts during adjustment to prevent pinching.
- Children: Keep small parts away from children.
Package Contents
Please verify that all components are present and undamaged before beginning assembly. If any parts are missing or damaged, contact your retailer for assistance.
- Main Pole and Base Clamp Assembly
- Gas Spring Monitor Arms (2 units)
- Central Monitor Arm
- VESA Plates (3 units)
- Cable Management Clips
- Hardware Kit (screws, washers, Allen keys)
- Instruction Manual
Setup and Installation
Step 1: Attach the Mount to Your Desk
The Maclean MC-137 offers two mounting options: desk clamp or grommet mount. Choose the method suitable for your desk.
- Desk Clamp: Secure the clamp assembly to the edge of your desk. Ensure the clamp is tightened firmly to prevent movement.
- Grommet Mount: If your desk has a grommet hole, use the provided grommet base and hardware to secure the mount through the hole.
Ensure the main pole is vertical and stable before proceeding.

Image: The Maclean MC-137 mount secured to a desk via the clamp, without monitors attached.
Step 2: Attach VESA Plates to Monitors
Attach the VESA plates to the back of your monitors using the appropriate screws from the hardware kit. Ensure the screws are tightened securely but do not overtighten.

Image: Detail of VESA plate attachment to a monitor arm.
Step 3: Install Monitor Arms and Monitors
- Slide the central monitor arm onto the main pole and secure it at the desired height.
- Slide the two gas spring arms onto the main pole, positioning them above or below the central arm as needed.
- Carefully slide the monitors (with attached VESA plates) onto the corresponding arms. Ensure they click into place or are secured with the provided locking mechanism.
- Adjust the height of the central monitor arm individually during installation to achieve an ergonomic and uniform display setup.

Image: Rear view of the triple monitor setup, illustrating monitor attachment and cable management.
Step 4: Cable Management
Route your monitor and power cables through the integrated cable management clips on the arms and main pole. This helps keep your workspace tidy and prevents cable clutter.
Operating Instructions and Adjustments
The Maclean MC-137 offers extensive adjustability for an ergonomic viewing experience.
Gas Spring Tension Adjustment
The two side arms feature gas springs for smooth and continuous height adjustment. If a monitor sags or rises too easily, adjust the gas spring tension using the provided Allen key. Turn clockwise to increase tension (for heavier monitors) and counter-clockwise to decrease tension (for lighter monitors).

Image: Detail of the gas spring tension adjustment point.
Monitor Position Adjustments
- Height Adjustment: The gas spring arms allow for effortless vertical movement of the monitors. The central monitor's height can be set during installation.
- Tilt: Each monitor can be tilted from -45° to +45° to reduce glare and optimize viewing angles.
- Swivel: Monitors can swivel laterally by ±90° at the VESA plate connection.
- Rotation: The arms can rotate 180° at the joints and around the main pole, allowing for flexible positioning and screen orientation (landscape or portrait).

Image: Illustration of the mount's flexible movement, including tilt (±45°), swivel (±90°), and arm rotation (±180°).

Image: Example of monitors configured in mixed portrait and landscape orientations.
Maintenance
- Cleaning: Wipe the mount with a soft, damp cloth. Avoid abrasive cleaners or solvents.
- Periodic Checks: Periodically check all screws and connections to ensure they remain tight and secure. Re-tighten if necessary.
- Gas Spring: The gas springs are designed for long-term use and generally require no maintenance. If performance degrades, ensure the tension is correctly adjusted for your monitor's weight.
Troubleshooting
- Monitor Sags or Does Not Stay in Position: The gas spring tension may be too low for the monitor's weight. Increase the gas spring tension by turning the adjustment screw clockwise with the provided Allen key.
- Monitor Rises Too Easily: The gas spring tension may be too high for the monitor's weight. Decrease the gas spring tension by turning the adjustment screw counter-clockwise.
- Mount Feels Unstable: Ensure the desk clamp or grommet mount is securely tightened to the desk. Check all arm connections for tightness.
- Monitors Are Not Level: Adjust the individual height of the VESA plates or the central arm on the main pole. Fine-tune tilt adjustments on each monitor.
Specifications
- Model: MC-137
- Brand: Maclean
- Material: Alloy Steel
- Color: Black
- Number of Monitors: 3
- Screen Size Compatibility: 17 - 27 inches
- Weight Capacity (per monitor): Up to 8 kg
- VESA Compatibility: 75x75mm, 100x100mm
- Tilt Range: -45° to +45°
- Swivel Range: ±90°
- Arm Rotation: 180°
- Mounting Type: Desk Clamp or Grommet Mount
- Cable Management: Integrated
- Product Dimensions (package): 43 x 30 x 13 cm
- Product Weight (package): 2.6 kg

Image: Technical drawing showing dimensions and movement ranges of the mount.
Warranty and Support
The Maclean MC-137 Triple Monitor Mount comes with a 2-year manufacturer's warranty. For warranty claims, technical support, or inquiries regarding missing/damaged parts, please contact your retailer or Maclean customer service with your purchase details.