1616585181: O.F.S. G-21

The Atlas Copco O.F.S. G‑21 air end, part number 1616585181, serves as the core compression unit for Atlas Copco oil‑free screw compressors. We source this unit directly from Atlas Copco (shanghai) Trading Co., Ltd., and deliver brand‑new genuine original stock to global industrial customers. Manufactured in Belgium, this precision‑built air end delivers stable, contamination‑free compressed air and extends the service lifespan of your existing compressor equipment.

This article covers product overview, full specifications, core advantages, working principle, replacement triggers and step‑by‑step installation guidance to help maintenance teams make well‑informed purchasing and servicing decisions.

Product Introduction

Industrial production facilities across food, pharmaceutical, electronics and chemical sectors rely on 100 % oil‑free compressed air to safeguard product quality and comply with strict industry regulations.

The O.F.S. G‑21 air end (1616585181) represents the heart of Atlas Copco oil‑free rotary screw compressors. Unlike oil‑injected screw air ends, this unit uses timing gear sets to synchronize male and female rotors without oil injection inside the compression chamber, so it generates truly oil‑free compressed air for critical production workflows. Many industrial plants face costly downtime when their original air end suffers rotor wear, clearance shift or internal bearing damage. Installing this brand‑new genuine 1616585181 air end restores your compressor back to factory‑rated flow, pressure and energy efficiency instead of investing in a complete new compressor machine.

We obtain every unit straight from Atlas Copco (shanghai) Trading Co., Ltd. Every product keeps original factory packaging, complete identification labels and full manufacturer traceability. The country of origin is Belgium, and the HS customs classification code is 8414909090 for smooth international import‑export clearance. Industrial buyers, maintenance contractors and equipment rebuild shops select this air end for ZR and ZT series oil‑free compressors, where clean compressed air directly impacts final product safety. Food processing, pharmaceutical manufacturing, semiconductor assembly and beverage bottling operations all benefit from the pure air output of this G‑21 air end.

Product Parameters

All technical data below match factory release records for part number 1616585181 ATLAS COPCO O.F.S. G‑21 air end.

– Part Number: 1616585181
– Part Name: O.F.S. G‑21
– Unit Price: $10,000 excluding VAT
– Country of Origin: BE (Belgium)
– HS Code: 8414909090
– Net Weight: 52.2 Kg
– Outer Dimension: Length 40 cm, Width 28 cm, Height 28 cm
– Compatible Equipment: Atlas Copco oil‑free screw air compressors (ZR / ZT series matching G‑21 specification)
– Condition: Brand‑new genuine original, sourced from Atlas Copco (shanghai) Trading Co., Ltd.
– Core Structure: Twin screw rotors with precision timing gear drive, no compression‑chamber oil injection

These physical dimensions help your logistics team calculate container space, pallet loading and on‑site lifting planning before delivery. The 52.2‑kilogram weight requires proper lifting tools during on‑site installation work. The HS code 8414909090 supports accurate customs declaration for cross‑border shipments, and avoids classification delays at international ports.

Product Advantages

Plant operators pick the genuine 1616585181 O.F.S. G‑21 air end for four practical operational strengths.

First, it maintains strict oil‑free air quality. Timing gears synchronize male and female rotors, and no lubricating oil enters the compression cavity. Your downstream filters do not handle oil aerosol contamination, filter service cycles extend, and you consistently meet ISO 8573‑1 zero‑oil compressed‑air standards. Pharmaceutical and food production lines eliminate risks of oil residue polluting finished goods.

Second, it preserves original‑grade energy efficiency. Factory‑machined rotor profiles and controlled micro‑clearances minimize internal air leakage. When you fit genuine air end, your compressor keeps its designed free‑air delivery without excessive power draw. Many facilities observe lower monthly electricity bills after replacing a worn‑out old air end with the new G‑21 unit.

Third, it delivers long‑term mechanical stability. High‑grade alloy steel rotors and heavy‑duty bearings resist thermal cycling and continuous 24‑hour industrial operation. Precision‑calibrated timing gears prevent rotor‑to‑rotor contact that causes catastrophic rotor damage. You reduce unexpected emergency shutdown events that hurt production schedules.

Fourth, it guarantees full supply‑chain traceability. We procure every unit directly from Atlas Copco (shanghai) Trading Co., Ltd. You receive complete factory labels, serial number records and full manufacturer compliance documentation. Maintenance teams validate part authenticity easily, and you keep equipment service records intact for plant audits.

Working Principle

The O.F.S. G‑21 oil‑free screw air end follows positive‑displacement rotary‑screw compression logic with timing‑gear‑driven twin rotors. Three sequential stages complete air compression: intake, compression and discharge.

During the intake phase, rotating rotors open the suction port. Ambient atmospheric air flows into the spaces between male and female rotor lobes. Rotor rotation traps a fixed volume of incoming air inside these lobe cavities.

In the compression phase, timing gears drive male and female rotors in precise synchronized rotation. The timing gear set keeps a safe, tiny clearance between the two rotors, and no direct metal‑to‑metal contact occurs during running. As air travels along the rotor length toward the discharge side, the volume of each trapped air pocket continuously shrinks. Shrinking volume raises air pressure and air temperature inside the compression chamber. Since no oil injects into this chamber, compression completes entirely through mechanical rotor motion.

At the discharge stage, rotor lobes align with the discharge opening. Fully compressed oil‑free air flows out toward the compressor after cooler and downstream piping networks. The rotors then cycle back to the suction side to draw in the next batch of ambient air. This repeating cycle delivers continuous steady compressed‑air output for your plant production lines. Bearings and timing gears sit outside the compression cavity, with independent lubrication circuits that never mix lubricant with process air. This mechanical layout forms the core reason this assembly produces truly oil‑free compressed air.

When You Need to Replace the 1616585181 O.F.S. G‑21 Air End

You should schedule air‑end replacement when you observe multiple consistent warning signs on your Atlas Copco oil‑free air compressor. Do not wait for complete catastrophic failure, because sudden breakdown triggers expensive unplanned production stops.

First, watch for persistent compressed‑air flow loss. When your compressor runs at full motor speed but cannot reach target working pressure, internal rotor clearance has grown from long‑term wear. Even full motor output cannot maintain rated air delivery, and your production machines suffer insufficient air supply.

Second, listen for abnormal mechanical noise. Metallic grinding, rattling or cyclic knocking sounds from the compressor main housing signal worn bearings or degraded timing gears. Shut down equipment for inspection immediately, as continued operation will destroy rotor surfaces.

Third, track rising discharge temperature without cooling‑system faults. If you fully service coolers, fans and heat exchangers yet discharge temperature stays abnormally high, internal air‑end wear creates excess mechanical friction and internal leakage.

Fourth, review your total runtime hours. Follow Atlas Copco official service documentation for oil‑free compressor service cycles. When your existing air end reaches the defined end‑of‑service‑life hour count, plan proactive swap‑out instead of running until breakdown.

Fifth, inspect after major equipment incidents. Events such as motor overload, liquid water ingestion inside the air end, or foreign‑object ingestion almost always damage rotor geometry. In these scenarios, direct replacement of the 1616585181 air end delivers more reliable long‑term performance than attempting partial component repair.

Installation Procedures

Only trained, qualified compressor service technicians should perform installation work. Always respect site safety rules and Lockout‑Tagout procedures before you start any service work.

• Step 1. Complete full machine isolation. Power off the compressor main electrical supply, apply official LOTO lock‑and‑tag devices. Open drain valves and release all residual pressure until pressure gauges read zero bar. Allow the whole compressor unit to cool fully down to ambient temperature to avoid high‑temperature burns.
• Step 2. Dismantle surrounding auxiliary components. Remove protective cabinet panels, disconnect suction piping and discharge piping connected to the old air end. Disconnect timing‑gear‑related access covers, and disconnect drive coupling assemblies. Label every cable and pipe connection for error‑free reassembly.
• Step 3. Safely remove the worn‑out original air end. Use appropriate lifting equipment rated for 52.2 kg working load. Loosen mounting bolts in cross‑torque sequence, lift the old air end slowly out of the compressor frame. Inspect mounting base surfaces, and clear away all dirt, carbon deposits and old seal residue. Check mounting bases for deformation or cracking.
• Step 4. Prepare the brand‑new 1616585181 O.F.S. G‑21 air end. Unpack the genuine unit and visually inspect for transit damage. Confirm printed part number and serial number match your order documentation. Prepare new gaskets and sealing elements as specified in the Atlas Copco service manual. Never reuse aged gaskets from the old air end.
• Step 5. Position and mount the new air end. Use lifting gear to lower the G‑21 air end carefully into the mounting frame. Align coupling interfaces and mounting holes perfectly. Tighten mounting bolts in cross‑pattern sequence to factory‑specified torque values. Incorrect torque leads to housing distortion and premature unit failure.
• Step 6. Reconnect couplings, piping and auxiliary assemblies. Align drive coupling within factory‑allowed misalignment tolerance. Fit brand‑new gaskets on suction and discharge flanges. Re‑fit timing‑gear access covers, cabinet panels and all previously disconnected pipelines. Double‑check every connection for proper seating.
• Step 7. Complete pre‑start inspection. Verify all tools and loose hardware stay clear of rotating parts. Confirm all safety guards sit in correct installed positions. Double‑check that no foreign objects remain inside air flow passages.
• Step 8. Execute commissioning and performance testing. Remove LOTO tags, restore power supply. Start the compressor following Atlas Copco startup procedures. Monitor running noise, discharge pressure, discharge temperature and vibration levels for 60 continuous minutes. Check all flange joints for air leakage. Record all operational readings into your plant equipment maintenance log. If you detect abnormal noise, vibration or leaks, shut down the unit immediately and troubleshoot before returning to production service.

Important note: Always reference the official Atlas Copco service manual for your compressor model for full torque values and detailed disassembly‑reassembly guidance. Improper installation will void related product performance expectations.

Order Now!

If you are looking for the new and original Atlas Copco 1616585181 O.F.S. G‑21 air end, contact ACD today for the latest quotation, availability, delivery options, and part-number verification. Send us your compressor model and serial number, and let our team help you confirm the correct component before you place your order.

Inquiry Now