Introducció
This manual provides detailed instructions for the assembly, operation, and maintenance of your DUMOS Ergonomic High Back Office Chair. Please read this manual thoroughly before assembly and use to ensure proper function and longevity of your chair.

Image: The DUMOS Ergonomic High Back Office Chair, light grey with black frame, positioned at a desk in a modern office environment.
Informació de seguretat
Precaucions de seguretat importants:
- Seguiu sempre les instruccions de muntatge que es proporcionen en aquest manual.
- Do not exceed the maximum weight capacity of 300 lbs (136 kg). Exceeding this limit may cause damage to the chair and potential injury.
- Assegureu-vos que tots els cargols i perns estiguin ben ajustats abans d'utilitzar-los. Comproveu-los periòdicament i torneu-los a apretar si cal.
- Mantingueu les mans i els dits allunyats de les peces mòbils durant l'ajust.
- Feu servir la cadira sobre una superfície plana i estable.
Contingut del paquet
Abans de començar el muntatge, verifiqueu que tots els components siguin presents i no estiguin danyats. Si hi ha alguna peça que falti o que estigui danyada, poseu-vos en contacte amb el servei d'atenció al client.
- Respatller (1)
- Coixí de seient (1)
- Reposabraços (2)
- Gas Lift Cylinder (1)
- Star Base (1)
- Rodes (5)
- Mechanism Plate (1)
- Paquet de ferramenta (cargols, volanderes, clau Allen)
Muntatge i muntatge
Assembly typically takes 10-15 minutes. All necessary hardware and tools are included. For visual guidance, refer to the included installation instructions and videos provided with your purchase.
- Fixeu les rodes a la base: Insert each of the five casters into the holes at the end of each leg of the star base until they click securely into place.
- Instal·lació de l'elevador de gas: Col·loqueu el cilindre d'elevació de gas al forat central de la base en estrella.
- Fixeu la placa del mecanisme al seient: Align the mechanism plate with the screw holes on the underside of the seat cushion. Ensure the front of the mechanism faces the front of the seat. Secure with screws using the provided Allen wrench.
- Fixar els reposabraços al seient: Secure the armrests to the sides of the seat cushion using the designated screws. Ensure they are oriented correctly for the flip-up function.
- Fixar el respatller al seient/braços: Connect the backrest to the seat and armrests using the remaining screws.
- Connecteu el conjunt del seient a l'elevador de gas: Col·loqueu amb cura el seient muntat sobre el cilindre d'elevació de gas, assegurant-vos que estigui centrat i estable.
Instruccions de funcionament
Your DUMOS Ergonomic Office Chair offers several adjustable features to customize your seating experience.
1. Ajust d'alçada del seient
To adjust the seat height, locate the lever on the right side beneath the seat. While seated, pull the lever up to lower the seat. To raise the seat, stand up and pull the lever up. Release the lever at your desired height.

Image: Visual representation of the chair's tilt and rocking mechanism, including recline lock, rocking tension, and height adjustment controls. Shows chair positions for 90° work, 105° rest, and 120° sleep.
2. Tilt and Rocking Function
The chair features a 90°-120° tilt function, ideal for transitioning between work and relaxation. Locate the lever on the left side beneath the seat.
- Per reclinar-se: Pull the lever outwards to unlock the tilt mechanism. Lean back to your desired angle and push the lever inwards to lock the position.
- To Adjust Rocking Tension: The round knob located at the front center beneath the seat controls the rocking tension. Turn clockwise to increase tension (making it harder to recline) or counter-clockwise to decrease tension (making it easier to recline).
3. Reposabraços abatibles
The armrests can be flipped up to allow the chair to be pushed closer to a desk or for space-saving storage. Simply lift the armrests upwards until they lock into a vertical position. To return them to the horizontal position, pull them down.

Image: The DUMOS office chair with its armrests shown in both the standard down position and flipped up, illustrating the space-saving feature.
Manteniment
Regular maintenance will help preserve the appearance and functionality of your chair.
- Neteja: Wipe the chair surfaces with a damp cloth. Avoid harsh chemicals or abrasive cleaners, which may damage the mesh fabric or cushion material.
- Comprovació de maquinari: Periodically check all screws and bolts to ensure they remain tight. Re-tighten as needed to prevent loosening and ensure stability.
- Cura de les rodes: Mantingueu les rodes lliures de cabells i deixalles per garantir un moviment suau.
Resolució de problemes
If you encounter any issues with your DUMOS Ergonomic Office Chair, refer to the following common solutions:
| Problema | Causa possible | Solució |
|---|---|---|
| La cadira no ajusta l'alçada | Gas lift lever not engaged or gas lift cylinder faulty. | Ensure the height adjustment lever is fully pulled up. If the issue persists, the gas lift cylinder may need replacement. |
| La cadira trontolla o se sent inestable | Cargols solts o terra irregular. | Revisa i estreny tots els cargols de muntatge. Assegura't que la cadira estigui sobre una superfície plana i uniforme. |
| Les rodes no giren suaument | Debris caught in casters or casters damaged. | Traieu els cabells o les restes de les rodes. Si estan danyades, és possible que calgui substituir-les. |
| El respatller no es reclina ni es bloqueja | Tilt lock lever not engaged or mechanism faulty. | Ensure the tilt lock lever is properly engaged or disengaged. Adjust rocking tension knob. |
Especificacions

Image: Technical drawing illustrating the dimensions of the DUMOS Ergonomic Office Chair, including seat height, depth, width, and overall chair height.
| Característica | Detall |
|---|---|
| Marca | DUMOS |
| Nom del model | Cadira d'oficina ergonòmica |
| Número de model de l'article | HJ3-BL-C-3699-GY |
| Color | Gris clar |
| Dimensions del producte | 20.08 "P x 20.47" W x 48.03" H |
| Mida total | 25.59" x 26.38" x 48.03" |
| Recomanació de pes màxim | 300 lliures (136 kg) |
| Estil d'esquena | Solid Back, S-shaped ergonomic design |
| Característica especial | Ergonomic, Adjustable Height, Flip-up Armrests, Tilt Function (90°-120°) |
| Estil de braç | Abatible |
| Material de farciment | High-density shaping foam (cushion) |
| Recomanació de superfície | Hard Floor (PU casters) |
| Muntatge obligatori | Sí |
| Pes de l'article | 27.6 lliures (12.5 kg) |
Garantia i Suport
For any questions, concerns, or assistance with your DUMOS Ergonomic Office Chair, please refer to the following resources:
- Manual d'usuari (PDF): A comprehensive PDF version of this manual is available for download aquí.
- Atenció al client: Contact DUMOS customer support for further assistance. Refer to your purchase documentation for specific contact details.
Please retain your proof of purchase for warranty claims, if applicable. Specific warranty terms may vary; consult your purchase receipt or product packaging for details.





