Hydraulic Office Chair Refueling

The refueling of a hydraulic office chair should be carried out according to the following steps, and strict adherence to the specifications is required during operation to ensure safety and performance:

1. Locate the refueling port

• Rubber stopper position: First, check the rubber stopper on the side of the hydraulic rod. Pull it out to directly add hydraulic oil. If the stopper is aged or missing, a backup method should be used.
• Backup refueling port: If the rubber stopper cannot be found, disassemble the small piston rod below the pressure rod, take out the internal steel ball, and then add oil through this hole. This operation should be carried out with caution to avoid losing the steel ball or damaging the sealing structure.
• Bottom/side interface: Some chairs have dedicated refueling ports at the bottom or side of the seat. Clean the surrounding dust first to prevent impurities from entering the oil cylinder and causing wear or jamming.

2. Prepare tools and materials

• Tool selection: Prepare an appropriate wrench according to the size of the refueling port to ensure smooth opening and closing of the cover. Also, prepare a clean cloth for wiping oil stains to avoid contaminating the hydraulic system.
• Hydraulic oil specifications: The hydraulic oil model must be strictly selected according to the requirements in the instruction manual. Different chairs have different requirements for parameters such as oil viscosity and temperature resistance. Incorrect use may lead to swelling of the seals, oil leakage, or adjustment failure. For example, anti-wear hydraulic oil should be used in high-temperature environments, and low-pour-point oil should be used in low-temperature environments.

3. Refueling operation

• Oil pretreatment: After opening the oil bottle, shake it gently to ensure uniformity and prevent sediment from clogging the oil passage. Insert the oil bottle upside down into the refueling port and use a wrench to fix the connection between the bottle mouth and the port to prevent oil leakage.
• Control the flow rate: Slowly invert the oil bottle to allow the oil to flow into the oil cylinder in drops, avoiding rapid pouring that may cause air to mix in or the oil to overflow. If the flow rate is too slow, gently press the seat to assist the oil in entering, but keep the pressure uniform to prevent sudden pressure changes from damaging the oil cylinder.
• Monitor the oil level: Observe the oil level mark on the oil cylinder to ensure that the oil surface is between the minimum and maximum marks. A low oil level will result in weak adjustment, while a high oil level may cause abnormal pressure, oil leakage, or the seat to sink automatically. If replenishment is required, add a small amount in batches and check repeatedly.

4. Post-refueling treatment

• Seal inspection: Clean the oil stains around the refueling port, tighten the cover, and ensure there is no looseness. If a backup refueling port (such as the piston rod hole) is used, reinstall the steel ball and test the sealing performance to prevent oil leakage.
• Function test: Slowly raise and lower the seat several times to check if the adjustment is smooth and if there are any abnormal noises or oil leakage. If any abnormalities are found, stop using it immediately and investigate the cause.

Precautions: Ensure that the chair is in the lowest position before operation to avoid oil splashing; if the hydraulic rod is severely aged or leaking oil, it is recommended to replace it with a new rod instead of simply refueling. Regular maintenance (such as checking the oil condition every 1-2 years) can extend the service life of the chair.