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What’s the Secret to Keeping Oil-Free Air Compressor Running Longer?

Oil Free Water Lubrication 75kw Screw Type Air Compressor

Regular maintenance of oil-free air compressors is essential for prolonging their lifespan. From startup procedures to operational checks, inspecting materials, and conducting timely component maintenance are all crucial steps in ensuring the longevity of oil-free air compressors. Let’s delve into the specific key points to pay attention to.


I. Methods to Extend the Lifespan of Oil-Free Air Compressors:

1. Follow the operational procedures for oil-free air compressor equipment. Most shutdown procedures are the reverse of startup. Gradually reduce the speed to a very low level. Fully open the exhaust branch valve, close the exhaust valve completely, shut down the drive motor, and confirm that the entire series of air compressor equipment will gradually stop automatically. Do not stop the supply of cooling water within 30 minutes after equipment shutdown.

2. After completing operations with oil-free air compressor equipment, inspect various cutting levels and check the fit between cutting pieces and cutting bodies. Replace parts if there are cracks on the slices. Check the front cover of each cylinder level and assess the friction on the cylinder mirror surface. Investigate friction conditions on the body guide rail and friction surface. Remove connecting rod bushings and crosshead pins, and assess friction on the friction surface.

3. Check the oil level indicated by the oil level indicator of the oil-free air compressor to ensure it meets requirements. Inspect connections and fastenings for any looseness and fix them promptly. Observe and assess the flexibility of moving parts. Rotate the flywheel by hand to allow the oil-free air compressor to idle two or three times. Address any issues of paper jams or collisions.

4. Check the quality of the lubricating oil in the oil-free air compressor and replace the lubricating oil in the body. Due to part wear and the cleaning action of lubricating oil during the initial operation of the oil-free air compressor, a large amount of metal fines enter the lubricating oil. Therefore, replace all lubricating oil after 24 hours of operation and change the oil again after 200 hours. Follow routine maintenance requirements for subsequent oil changes.


II. Major Component Maintenance of Oil-Free Air Compressors:

1. Ensure that all pressures within the oil-free air compressor system have been released, isolated from other pressure sources, the main circuit breaker is disconnected, and safety markings prohibiting closing are in place before repairing or replacing each component as per the table.

2. The timing of compressor cooling lubricating oil changes depends on usage environment, humidity, dust, and the presence of acidic or alkaline gases in the air. For newly purchased oil-free silent air compressors, replace the oil after the first 500 hours of operation, then every 4000 hours thereafter for normal oil change cycles. Machines operating less than 4000 hours annually should have their oil changed once a year.

3. Replace the oil filter after the first 300-500 hours of initial operation, then every 2000 hours thereafter for normal replacement intervals of every 2000 hours.

4. When maintaining or replacing air filters or intake valves, prevent any debris from entering the compressor’s main cavity. Close the main machine inlet during operations and rotate the main machine several turns by hand in the direction of rotation after completion of operations to ensure no obstructions before starting.

5. Check belt tension every approximately 2000 hours of machine operation. Adjust loose belts until they are tight to protect them from oil contamination throughout the process.

6. Replace the oil filter every time the oil is changed.


  1. DEHAHA Compressor Jiangsu Co., LTD. “DEHAHA Air Compressor Product Brochure.” Available at: Dehaha Compressor
  2. “Why Should Industries Choose Oil-Free Air Compressors?,” By Henry. Available at:

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Electric Driven Portable Screw Air Compressor
Electric Driven Portable Screw Air Compressor
Electric Driven Portable Screw Air Compressor   Electric Driven Portable Screw Air Compressor
Scroll compression principle Compressor sucks air through air inlet located at outer scroll.Compression chamber goes smaller with rotary movement and trapped air is compressed.Compression chamber becomes minimum volume at the center of the scroll and air is pumped out through air outlet located at the center of scroll.These, suction, compression & discharging, process is repeated continuously. Long maintenance cycle with long life consumable parts. Compressor head replacement at every 10,000 hours or 4 years whichever comes earlier. Scroll oil free screw air compressor, 100% oil free for food industry, dental and medical industry. Technical parameter Model Capacity (m³/min ) Power (kW) Host architecture Exhaust pressure (Mpa) Noise (dB) Outlet diameter Dimensions (mm) L*W*H Weight (kg) DHH2OS 0.24 2.2 2.2*1 0.8 58±2 1/2 640*660*890 200 DHH3OS 0.41 3.7 3.7*1 0.8 58±2 1/2 640*660*890 220 DHH3OS 0.36 3.7 3.7*1 1 58±2 1/2 640*660*890 220 DHH5OS 0.60 5.5 5.5*1 0.8 58±2 1/2 640*660*890 240 DHH7OS 0.82 7.5 3.7*2 0.8 58±2 3/4 1000*690*990 300 DHH7OS 0.72 7.5 3.7*2 1 58±2 3/4 1000*690*990 300 DHH11OS 1.25 11 5.5*2 0.8 58±2 3/4 1000*690*990 340 DHH11OS 1.25 11 3.7*3 0.8 58±2 3/4 1150*690*1700 430 DHH11OS 1.08 11 3.7*3 1 58±2 3/4 1150*690*1700 430 DHH15OS 1.66 15 3.7*4 0.8 62±2 1 1490*1150*1290 620 DHH15OS 1.44 15 3.7*4 1 62±2 1 1490*1150*1290 620 DHH16OS 1.80 16.5 5.5*3 0.8 62±2 1 1150*690*1700 490 DHH18OS 2.14 18.5 3.7*5 0.8 65±2 1 1490*1150*1700 840 DHH18OS 1.77 18.5 3.7*5 1 65±2 1 1490*1150*1700 840 DHH22OS 2.55 22 5.5*4 0.8 65±2 1 1490*1150*1290 700 DHH22OS 2.55 22 3.7*6 0.8 65±2 1 1490*1150*1700 910 DHH22OS 2.11 22 3.7*6 1 68±2 1 1490*1150*1700 910 DHH30OS 3.40 30 3.7*8 0.8 68±2 5/4 1490*1150*2140 1140 DHH30OS 2.81 30 3.7*8 1 68±2 5/4 1490*1150*2140 1140 DHH33OS 3.60 33 5.5*6 0.8 68±2 5/4 1490*1150*1700 1010 Clean oil free compressed air Adopt 74 degree conicity dry seamless, more reliable seamless, eliminate air leakage. Not just compression process is oil free, but also on the afterward transportation adopt stainless steel pipe, stainless steel check valve, stainless steel air receiver(for air receiver mounted), ensure the quality of compressed air. High efficiency scroll air end Adopt the advanced oil free scroll airend, reliable bearing and grease, make sure the reliability and long life-span of airend, high precise machine for motivated scroll, fixed scroll and housing, ensure high efficiency of airend. Reliable seamless material, ensure compression chamber and lubricated transmit 100% be separate, ensure compressed air is oil free. High Reliability Cooling fan adopt integrated centrifugal impeller, low noise, high cooling air pressure, high cooling air, ensure the cooling air is enough, ventilation fan adopt silence axial fan, ensure the heat inside of cabinet could be eliminated in time. Heat exchange has been increased 20%-30%, anticorrosive treatment inner structure, after strict testing, ensure the exhausting air less than environment temp.+10-15ºC, reduce the burden of downstream equipment. Adopt direct driven, not belt driven, improve transmission efficiency & reliability, reduce the maintenance cost of changing belt. Project case 30Kw 120CFM compressor 8bar pressure oil free rotary scroll air compressor
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