I. Pre-installation Preparation

Before installation, verify that the hand-crank lift's model, left/right orientation, mounting holes, included screws, and tube dimensions are compatible with the desk and chair structure, and ensure the lift stroke matches the required height adjustment range.

Recommended tools: power drill, screwdriver, hex key, open-end wrench, tape measure, locating fixture, marker, level, and necessary PPE. For mass production, use dedicated jigs to ensure hole alignment consistency.

II. Inspect Components and Piping

Before installation, inspect the hoist for intact appearance, smooth operation of transmission parts, matching crank handle interface, and check plastic or metal components for deformation, cracks, or obvious burrs.

Also verify the inner and outer diameters, wall thickness, and hole positions of the desk and chair tubing. Significant deviations in tubing dimensions can cause the height adjuster to be too tight, too loose, or difficult to operate smoothly.

3. Confirm Installation Direction

Hand-crank lifters have a specific installation orientation. Before installing, verify that the crank handle is positioned for easy operation, the lifting direction matches the product design, and both left and right sides are consistent.

If installed incorrectly, the crank may interfere with the frame, cause uneven lifting, or compromise overall performance. Therefore, verify a single sample before proceeding with bulk assembly.

IV. Positioning and Cutting

Mark hole positions on table legs, chair legs, or related tubing per drawings or samples. Use positioning jigs to improve accuracy and reduce assembly errors in mass production.

When drilling, ensure holes are perpendicular with smooth edges to prevent burrs from interfering with actuator installation. After drilling, clean away metal shavings or plastic debris to avoid them entering the transmission mechanism.

5. Install the hoist body

Place the hand crank lifter body into its designated mounting position and align the holes with those in the table or chair frame. Once aligned, insert the screws or fasteners and pre-tighten them without fully locking them yet.

Once both lifters, the connecting structure, and the crank are fully aligned, gradually tighten the screws. This prevents structural misalignment caused by locking a single point too early.

6. Install the Crank Handle or Transmission Components

Install the crank, connecting rod, or transmission component to the designated position according to the product structure. Ensure that all interfaces are fully inserted and fastening screws are tightened securely. The mechanism should operate smoothly without noticeable sticking or abnormal friction when cranked.

If using a dual-side synchronous lifting mechanism, ensure both sides start at the same height, and that the transmission rods are the correct length and installed in the proper positions to prevent uneven lifting.

VII. Lift Adjustment

After installation, perform multiple lift/lower tests. During testing, check that the hand crank operates smoothly, the lifting process is stable, and there are no unusual noises, sticking, shaking, or left-right synchronization issues.

If adjustment is difficult, check for misaligned holes, overtightened screws, deformed tubing, interference with moving parts, and ensure the height-adjustment mechanism matches the desk or chair structure.

8. Tightening and Re-verification

After debugging is successful, tighten all fixed screws according to specifications. During batch assembly, implement a re-inspection process focusing on crank operation, lifting range, stability of tables and chairs, surface scratches, and missing screws.

For factory-finished products, we recommend re-testing the lift function before packaging to ensure customers can use them immediately upon receipt.

IX. Precautions for Batch Assembly

When installing manual crank lifters in bulk, furniture manufacturers should ensure consistency across accessory batches, hole positioning, and assembly tools. For new or temporary assemblers, provide standard samples and clear operating guidelines to minimize assembly errors. If using a lifter model for the first time, conduct a small-scale trial run before proceeding with full-scale production.