Simple Office Chair Repair

Repairing a simple office chair requires targeted measures based on specific issues. Here are common problems and their repair methods:

I. Repair for Tilt to One Side

1. Check Wheel Contact with the Ground

   • Place the chair upright and upside down to observe if all wheels are in contact with the ground. If uneven, it may be due to damaged wheel feet or an uneven floor.
   • Invert the chair and inspect the wheel feet for cracks, deformation, or wear. If the wheels are damaged, replace them with new ones: Contact the manufacturer with the chair model to order matching wheels, or remove the old wheels and take them to an office supply store to compare the shape and size of the wheel axles, selecting a replacement set of the same specifications.

2. Remove Old Casters

   • Pull out the casters directly by hand; if stuck, insert a flat-head screwdriver into the gap between the caster and the chair contact point, using it as a lever to slowly pry and pull out about 1 centimeter before pulling again.
   • In rare cases, casters are fixed with screws and need to be removed by loosening the screws with a screwdriver.

3. Lubricate and Install New Wheels

   • Apply a small amount of spray lubricant (such as WD-40) to the chair base sockets, insert the straw into the nozzle, and quickly spray each socket for half a second; if no spray lubricant is available, apply a pea-sized amount of petroleum jelly to the wheel axles.
   • Tap the new casters into the sockets with a rubber mallet: Align the caster rod with the base, push gently by hand first, and if unable to insert, tap lightly near the base of the caster rod stem with a rubber mallet (avoid tapping plastic parts directly).

4. Test and Further Inspection

   • Invert the chair and sit on it to test if the new wheels are stable. If still tilted, check if the seat plate is damaged: Lay the chair on its side, locate the metal seat plate (usually a square black painted steel plate at the bottom of the seat, connecting to the cylindrical column), and observe for deformation or breakage.

II. Repair for Backrest Unable to Stand Upright or Adjust

1. Troubleshoot Hydraulic System Failure

   • The backrest is adjusted by the extension and retraction of the hydraulic rod. If unable to stand upright or adjust, it may be due to hydraulic system failure.

2. Inspect Transmission Components and Screws

   • Lay the chair on its side and inspect the transmission components starting from the backrest. If the toggle is normal but the hydraulic mechanism is detached, check the pivot fixing screws (usually non-standard 10*1 screws):
     • A standard size 10 screw can be used as a replacement. Use a tap to thread the hole or directly fit the screw with a wrench, installing it in the original position with a recommended length of 30 millimeters (the original may be shorter).
     • If forcing the screw in results in poor nut-bolt fit, thread a nut onto the bolt and ensure the screw installation does not obstruct the range of motion of the hydraulic rod (adjustable by adding shims).

When repairing, pay attention to the force applied to avoid damaging other parts of the chair. If the problem is complex or cannot be resolved, it is recommended to contact professional repair personnel or the manufacturer for further support.