Description
The 1616710390 is the service stage for the OIS D-11 oil-injected screw element, the compression stage whose documentation designation reads SERV.STAGE GX2-5C OIS D-11 (C40). It is ordered through the service channel when the stage fitted to the machine has reached the end of its service life, and it arrives as one complete assembly: housing, rotor pair, bearing sets and shaft seals, built and set at the factory. At 42 x 30 x 10 cm and 7.19 kg, it sits at the light end of the complete-stage range, and the renewal it supports is correspondingly compact.
This page sets out the identification and physical data for the 1616710390, explains how its two ordering numbers relate to each other, and describes what an oil-injected screw stage does, how wear shows up, and what fitting a complete replacement involves. The sections follow the order a renewal actually happens in: identify, order, receive, fit, record.
The two references in play are the 1616710390 itself and its production counterpart 1616710380, and both are set out with their roles below.
One Stage, Two Numbers
Atlas Copco screw elements carry two references. The production number 1616710380 belongs to the stage fitted to new compressors at the factory. The service number 1616710390 is the order code for the same element through the service channel, and it is the number this page is written around. Both numbers name the OIS D-11 stage; they differ in where they appear, not in what they point to.
For a renewal, the service number is what goes on the order. Quotations, order confirmations and the service documentation all key on the 1616710390, so quoting it in the first message puts the enquiry on the right track from the start. The production number has its own job: it is the reference to quote when reading a machine parts list or checking which stage was fitted when the compressor left the factory. Archived parts lists, factory records and earlier quotations all carry the 1616710380, so the history of what was fitted stays readable through the production reference.
Keeping the two references straight is what makes an enquiry fast. A question about what is fitted to a specific machine is answered by the production number; a question about what to order is answered by the service number. The 1616710390 closes the ordering question on its own, and the production number completes the machine’s history. Send either one together with the machine details and the identification closes in a single pass.
Technical Specifications
The tables below record the identification and physical data for the 1616710390 as supplied through the service channel.
Part Identification
| Parameter | Value |
|---|---|
| Item number | 1616710390 |
| Description | SERV.STAGE GX2-5C OIS D-11 (C40) |
| Product group | Oil-injected screw service stage |
| Country of origin | Belgium |
| Tariff code | 8414900090 |
| Serialized | Yes |
Dimensions and Weight
| Parameter | Value |
|---|---|
| Length | 42 cm |
| Width | 30 cm |
| Height | 10 cm |
| Weight | 7.19 kg |
Each 1616710390 is serialized, and the number on the plate links the physical stage to its supply and documentation record through installation and every service event after it. The serial and the 1616710390 together identify the unit beyond doubt. Keep both together with the machine’s maintenance file: when the next renewal is being planned, the file states exactly what is fitted and when it went in.
Inside an Oil-Injected Screw Stage
In an oil-injected screw element, the injected oil seals the running clearances, carries away the heat of compression and lubricates the surfaces along the compression path. The male and female rotors mesh through their machined profiles and stay separated by an oil film rather than metal-to-metal contact, so the rotors themselves are not where the wear concentrates. Air enters the stage, is compressed as the rotor chambers turn, and leaves with the oil carried in the air stream to be separated and cooled downstream before the machine recirculates it.
Because the oil does the sealing and the cooling, the components that age are the ones around the rotors: the bearing sets that carry the rotor loads and the shaft seals that keep the oil on its own side of the air path. That is why the condition of an oil-injected stage is read through its output — delivery, power draw, discharge temperature, noise — and why the repair that restores it replaces the complete internal assembly rather than adjusting the parts around it.
The oil circuit and the air circuit meet only where the design intends them to. Injected oil travels with the compressed air to the separator, which returns it to the circuit, and the shaft seals hold the boundary at the stage itself. That division is what makes the machine’s output readable as a condition signal: when delivery, temperature or noise drift, the cause sits in a short list of components, and the 1616710390 sits at the center of that list.
Why Renewal Comes as a Complete Stage
Rebuilding a screw element means replacing the bearing set and the shaft seals and then re-setting the rotor clearances to factory values — precision work that needs dedicated tooling and a controlled environment. Clearances set in the field depend on the skill of the day; clearances set on the factory line are the ones the rotor pair was machined against. The 1616710390 takes that work out of the field: it arrives with the bearings, seals and clearances already set at the factory, so the renewal becomes an exchange of assemblies rather than a rebuild on the workshop floor.
The small format sharpens that advantage. At 7.19 kg the 1616710390 is handled by one person, carried to the machine in its packaging, and exchanged with hand tools within a scheduled service visit. There is no crane to book, no route to survey and no heavy rigging to arrange — the practical work of the renewal sits entirely in the mechanical connections, and the machine is down for hours, not days. The 7.19 kg on the specification sheet is what keeps the whole procedure that light.
Wear Signals and the Renewal Decision
A stage wears gradually, and the operating data moves before anything breaks. Free air delivery slips against the same power input. Specific energy climbs, so the machine pays more kilowatt-hours for each cubic meter of air. Discharge temperature drifts upward as internal clearances begin to leak, and noise or vibration at the stage sharpens as bearing clearances grow. Each of these readings has alternative causes in the surrounding system, so the coolers, separator and filters are ruled out first and the 1616710390 is charged with the fault only when the readings point its way.
The trend line separates a slow internal decline from a step change caused by a blocked cooler or a fouled separator, which is why plants that log these readings hold the advantage when the decision comes. Left to run to failure, a worn stage does not announce its end: bearing fatigue progresses until the machine stops on its own, at a moment the production schedule did not choose. Renewing the 1616710390 on condition — ordered against the confirmed number and fitted inside a planned service window — keeps that decision where it belongs, with the maintenance calendar.
Fitting the Service Stage
The renewal is a short, scripted job when it is prepared. The new 1616710390 stays in its packaging until it stands at the machine, and the port caps stay on until connection so nothing enters the rotor chamber. Mounting faces are cleaned, the fastener torques follow the values in the compressor manual, and the shaft seal surfaces are handled with the care any precision component deserves. With the old stage out, the serial numbers of both units go into the maintenance record — one retired, one installed.
Planned this way, the 1616710390 exchange fits inside a routine service stop. The stage is a single assembly with nothing to build out on site, the handling is a one-person job, and the work of the visit concentrates on connections and checks rather than on moving weight. The compressor returns to service with a new factory-set stage and a clean entry in its maintenance file.
Ordering the Correct Stage
Two details close the identification: the stage number and the machine. The 1616710390 is read from the plate on the old stage, from a previous quotation, or from the service documentation, and the compressor is identified by the model and serial number on its nameplate. Send the pair together and the match is confirmed in one pass, with no chain of follow-up questions between departments.
Where the plate on the old stage has worn past reading, the nameplate details still identify the machine, and the service documentation for that serial carries the stage reference. Either route ends in the same place: the correct 1616710390 on order, the identification already settled, and the exchange scheduled into the window the maintenance team has set.
Genuine Atlas Copco Supply from Seadweer
Seadweer supplies genuine Atlas Copco screw stages and the machines they serve, alongside the wider range of compressors and original parts. Send the 1616710390 reference with your machine details and we will confirm the match and prepare the quotation.
FAQ
What does the OIS D-11 designation stand for?
OIS is the Atlas Copco family mark for Oil-Injected Screw elements, and D-11 identifies the size class of this stage within that family. The full documentation designation for the 1616710390 reads SERV.STAGE GX2-5C OIS D-11 (C40), and the service number 1616710390 is the reference that identifies the part in quotations and order confirmations.
What is the difference between 1616710390 and 1616710380?
They are the two references for the same OIS D-11 stage: 1616710380 is the production number fitted to new compressors at the factory, and 1616710390 is the service number used to order the stage through the service channel. For a renewal, quote the service number; the production number is the reference for parts lists and factory-fitted records.
How heavy is the stage, and what does fitting involve?
The 1616710390 measures 42 x 30 x 10 cm and weighs 7.19 kg, so one technician carries it to the machine without lifting equipment. Fitting is an assembly exchange: ports capped until connection, mounting faces cleaned, fastener torques set from the compressor manual, and the serial numbers of the old and new stages recorded.
How do I confirm the 1616710390 matches my compressor?
Read the number from the plate on the stage being replaced, or take the model and serial number from the compressor nameplate. Send either or both, and the 1616710390 is checked against the service documentation before the order is placed. One message with those details is enough.
When does an oil-injected screw stage need renewal?
On condition, not on a fixed date. Delivery falls, specific energy climbs and discharge temperature drifts as the internal clearances leak, and noise or vibration sharpens as the bearings wear. When those readings survive a check of the coolers, separator and filters, the stage is the cause, and the 1616710390 is ordered for a planned exchange rather than a failure response.
Is the stage delivered complete?
Yes. The 1616710390 arrives as one factory-built assembly with housing, rotor pair, bearing sets and shaft seals in place and the internal clearances set at the factory. There is no on-site internals work and no loose parts, so the renewal is an exchange measured in hours inside a scheduled service visit.
Grace Adeyemi –
Our GX package was due for its element renewal, so we sent the service number 1616710390 together with the nameplate details and had the match confirmed the same week. The stage arrived boxed and complete, and at just over seven kilograms one technician carried it to the machine without any lifting equipment. The old stage came out, the new one went in with the ports capped until connection, torques set from the manual, and the compressor was back at its rated delivery before the afternoon. A clean exchange from quotation to restart.