Repair Office Chair Base

The method for repairing an office chair base should be selected based on the specific issue. Common situations and repair steps are as follows:

I. Unstable Base

If caused by loose screws, locate the loose positions (such as the connection between the seat and the base, or the interface between the five-star foot and the pneumatic rod), and tighten all the screws using matching tools (screwdrivers, wrenches, or Allen wrenches). For screws that repeatedly loosen, apply glue (such as 502 glue, wood glue, or anaerobic thread-locking adhesive) to the screw holes or threads before tightening to enhance fixation.
If there is still structural looseness, abnormal noise, or play after tightening the screws, it may be due to worn or damaged components (such as deformed metal connections, worn nylon slides, or brittle plastic clips). Check the clips or wheel axles on the boss chair base and replace worn or damaged components.

II. Chair Sinking

Method 1: Hose Clamp Repair

1. Slide down the plastic skirt to expose the metal cylinder; if the skirt covers the cylinder, invert the chair, use a screwdriver to press the base fixing clip, remove the wheels and skirt, and then reinstall the wheels.
2. Wrap a hose clamp around the cylinder (do not tighten it yet), and improve the grip of the clamp by wrapping rubber bands, tape, or sanding the cylinder surface.
3. Tighten the clamp until the chair is at the correct height, rotate the screw to secure it; test the height, and if incorrect, adjust the position of the clamp. If the clamp slips, secure it with a rubber strip or switch to the PVC pipe method.

Method 2: PVC Pipe Repair

1. Measure the diameter of the cylinder and its length at the desired height, and purchase a PVC pipe with the same or slightly larger diameter (such as 1.5 inches/3.8 cm), with a length suitable to cover from the chassis to the seat.
2. Secure the pipe in a vise and saw it lengthwise on one side (wear a mask or respirator to prevent dust).
3. Push the cut side onto the cylinder to hold the chair in place and prevent it from sinking.

III. Chair Tilting

1. Check the wheels: Place the chair upright and upside down to confirm whether the wheel feet are evenly in contact with the ground. If the wheel feet are bent or broken (due to uneven weight distribution, manufacturing defects, or wear), replace them with new wheels.
2. Replace the wheels:
   • Purchase wheels of a matching model (contact the manufacturer or take the old wheels to an office supplies store for matching).
   • Remove the old wheels: Hold the wheel with one hand and the bottom of the chair with the other hand and pull firmly; if stuck, insert a flat-head screwdriver into the gap between the wheel foot and the chair as a lever, pull out about 1 cm, and then pull again; a very small number of screw-fixed wheels require loosening with a screwdriver.
3. Install the new wheels:
   • Apply spray lubricant (such as WD-40) or petroleum jelly to the base socket.
   • Tap the casters into the socket with a rubber mallet, align the rod with the base, and tap gently when not fully seated before tapping harder to avoid deformation.
4. Test and troubleshoot: Invert the chair and sit on it to test. If it still tilts, check whether the seat plate is damaged.