Chair stuck in up position and hydraulic piston won't release. Any tricks to fix?
The information on this web page may be helpful. If the height adjustment lever is working fine then best to replace the gas lift cylinder. Help My Office Chair Keeps Sinking
SOURCE: HOW DO I FIX MY OFFICE BOSS CHAIR IT LEANS BACKWARDS AND WON'T STAY STRAIGHT
without sounding like a smart ***, have you checked the adjustors under the seat. Some handles are 3way handles and can do multiple adjustments. If you have adjusted all the knobs and handles, maybe it is leaking gas or in some case oil. Some of these chairs have an extra knob at the back of the seat along the column of the back rest, as to lock it in the desired position. Good luck.
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