Answer: Check for loose parts, worn components, or improper lubrication, and repair as necessary.
Answer: It uses water as a lubricant, achieving oil-free operation.
A. Cylinder head and air liner B. Piston and piston rod C. Valve assemblies and lubrication systems D. These are all answers: D. all of the above are
Answer: The discharge capacity ranges from [A] to [B] m³/min.
A. General B. Poor C. Better D. Very good answer: D. very good
A. Higher B. Lower C. Same as oil injection air compressor D. The answer cannot be determined: B Analysis: Oil-free air compressors do not need to replace lubricants and oil filters, so the maintenance cost is low.