Atlas Copco 2989015401 H03MK2 Oil-Injected Screw Service Stage

Description

The 2989015401 is the Atlas Copco service stage of the H03MK2 oil-injected screw element. It carries the official designation SERV.STAGE (H03MK2) and serves the mid-range of the Atlas Copco oil-injected portfolio: the GA 11, GA 15, GA 18 and GA 22 compressors, together with the GX 15, GX 18 and GX 22 models. The number is also the convergence point of two legacy references, because both 1616578981 and 2989015400 are superseded by the 2989015401.

That double replacement makes this stage a frequent subject of ordering questions. One plant holds documentation that names 1616578981, while a sister machine in the same building references 2989015400, and both orders today land on the same current number. This article sets out the identity of the stage, the machines it serves, the way the element works and the figures you need before ordering.

Identity of the 2989015401 Service Stage

Element renewals are the orders where number confusion costs the most time, and this stage sits right at a junction of old and new references. Reading the designation and the replacement chain together removes most of that confusion before an order is placed.

What the SERV.STAGE (H03MK2) Designation Covers

The 2989015401 is listed with the designation SERV.STAGE (H03MK2). The designation names the H03 stage in its MK2 revision, and SERV.STAGE marks the part as the service-track unit of that stage: the complete compression module supplied for renewal work, with rotors, housing, bearings and shaft sealing arriving as one serviced assembly. The stage belongs to the oil-injected screw family, which is also visible in its rate group, listed as S3K Oil injected screw, Element.

Reading the designation together with the tag on the old element is the fastest way to fix the identity of the part you need. The MK2 revision is the version Atlas Copco currently supplies for the H03 stage, and the 2989015401 is its ordering number.

Two Legacy Numbers, One Current Number

The 2989015401 replaces two numbers at once. The first is 1616578981, a reference still present across a large installed base of GA and GX machines. The second is 2989015400, the earlier listing of the H03 stage itself. Atlas Copco directs both references to the same current number, so a renewal documented under either legacy reference is ordered today as the 2989015401.

In practice this shows up as follows. A service file that names 1616578981, a quotation from years ago that names 2989015400, and a current order for the H03MK2 stage all describe the same position in the machine. The practical consequence is simple: whichever of the three numbers your documentation carries, the order conversation starts with the 2989015401, and the old tag code is kept in the records so the machine history stays traceable.

For fleet owners the consolidation is an advantage. One stocking number covers machines that were delivered under different documentation generations, and the 2989015401 becomes the single reference to carry in the maintenance system for the whole group.

Compressors That Use the 2989015401 Stage

The confirmed machine list for this stage covers the GA fixed-speed compressors and the GX models. Both ranges are oil-injected screw machines, and they share the same core stage across their power band.

GA 11, GA 15, GA 18 and GA 22

The 2989015401 serves the GA 11, GA 15, GA 18 and GA 22 compressors. These are fixed-speed oil-injected screw machines for general plant air, spanning the power band where a single compressor often carries a whole workshop or a production section. In each of these machines the H03MK2 stage is the working core that turns motor power into compressed air, and the 2989015401 is the number to order when that core needs renewal.

The four models share the stage, which simplifies planning for sites that run several of them side by side. One renewal unit, one set of handling data and one ordering conversation cover the whole GA group, regardless of which machine the element comes out of.

GX 15, GX 18 and GX 22

The 2989015401 also serves the GX 15, GX 18 and GX 22 models. The GX range places the same oil-injected screw stage inside a machine package that adds further treatment of the air within the unit itself, so the compression core is identical while the surrounding machine differs from the GA. That is why a renewal conversation for a GX 18 lands on the same stage number as a GA 22, and why the two ranges can share one spare-part position in the maintenance plan.

The Related Stage on G 15-22 Machines

The H03 stage family also reaches the G 15 to G 22 machines through a related stage number, 1616578982. That number belongs to the same stage family and appears in the documentation of G machines in this power band. If your compressor is a G 15, G 18 or G 22, the tag on the old element decides which number applies, and Seadweer checks that code against the machine build before the order. The 2989015401 remains the reference for the GA and GX machines listed above.

Confirming Fitment Before Ordering

Element renewal is the one spare-part order where the model name alone is not enough. Read the code on the old element tag, note the compressor model and serial, and send both to Seadweer. The team checks the number against the machine build and confirms whether your unit takes the 2989015401 directly or comes from the legacy references 1616578981 or 2989015400, or from the related stage on a G machine. One pass of verification removes the wrong-part risk entirely.

How the Oil-Injected Screw Stage Works

The H03MK2 is an oil-injected screw element, and its working principle explains both its efficiency and its service profile. Two intermeshing helical rotors spin inside a precision-bored housing. Injected oil seals the running clearances between the rotors, carries compression heat away and lubricates the bearings, so the rotors stay separated by an oil film rather than metal-to-metal contact.

Because the oil does three jobs at once, the stage holds its efficiency over long runs, and wear concentrates in the bearings rather than in the rotors themselves. Air enters the element after filtration, is compressed along the rotor path, and leaves at the working pressure; the oil is removed downstream by the separator of the host machine. The 2989015401 renews this core as one serviced unit, while oil separation, cooling, drive and control components stay part of the host machine.

Keeping the swap clean also depends on the surrounding service work. The oil circuit of the host machine is refreshed at the same visit, the separator and filters are checked, and the new stage is run in under observation so the pressure band and oil temperature settle back to their normal readings. A renewal of the 2989015401 therefore lands as a complete stage restoration on the machine, and the operating records keep a clean before-and-after picture for the maintenance file.

Wear Signs and Renewal Timing

An oil-injected air end usually announces its aging through measured trends long before it fails outright, and the trends are readable with the instruments most plants already run.

Possible Warning Signs

Possible signs of element wear can include rising specific energy, drifting discharge pressure, unusual noise or vibration, higher oil temperature and metal traces in the oil sample. Specific power climbs first in many cases, because widening internal clearances let compressed air slip back instead of leaving the stage. Any one of these trends on a GA or GX machine in this range is a reason to inspect the air end and plan the renewal around the 2989015401.

Timing the Renewal

Oil-injected elements are commonly overhauled somewhere in the 20,000 to 40,000 running-hour band as a family-level reference, but the real timing follows the condition of your machine and the applicable service documentation rather than a fixed hour target. Vibration checks, oil analysis and temperature trends predict bearing condition long before a fixed count is reached. A planned renewal with the 2989015401 beats an unplanned stop, because bearing fatigue left alone can let the rotors seize, which in most cases writes the element off instead of allowing a repair.

Technical Specifications

The tables below collect the identification and physical data of the 2989015401 in one place, exactly as the item data lists them.

Part Identification

Dimensions and Weight

The 47.00 kg weight and the 43 × 32 × 41 cm box place the 2989015401 in the class of stages handled with standard workshop equipment at the machine. The figures are item data for handling and logistics reference, and Seadweer confirms the current package details with the quotation.

FAQ

What is the difference between 2989015401 and 1616578981?

They describe the same stage position on the machine. The 1616578981 is a legacy reference still found in older documentation, and the 2989015401 is the current number Atlas Copco directs renewals to.

Does 2989015401 also replace 2989015400?

Yes. The 2989015400 was the earlier listing of the H03 stage, and the 2989015401 is its current successor. Orders documented under either legacy number land on the same current stage.

Which compressors use the 2989015401 stage?

The confirmed list covers the GA 11, GA 15, GA 18 and GA 22 and the GX 15, GX 18 and GX 22. G 15 to G 22 machines reference the same stage family through the related stage number 1616578982.

How big and how heavy is the 2989015401?

The item data lists 43 × 32 × 41 cm and 47.00 kg. These figures describe the serviced stage as packed, so standard workshop equipment covers the handling during a planned swap.

How do I confirm the right stage before ordering?

Read the code on the old element tag and note the compressor model and serial, then send both to Seadweer. The fitment check names the exact number for your build, whether that is the 2989015401, a legacy reference or the related stage.

What are the signs that the stage needs renewal?

Possible signs can include rising specific energy, drifting discharge pressure, unusual noise or vibration, higher oil temperature and metal traces in the oil sample. Any of these trends is a reason to inspect the element and plan the renewal.

• 2989015401 is the genuine Atlas Copco service stage for the H03MK2 oil-injected screw element, designation SERV.STAGE (H03MK2).
• It supersedes two legacy numbers at once: 2989015400 and 1616578981.
• It fits the GA 11, GA 15, GA 18 and GA 22 and the GX 15, GX 18 and GX 22.
• G 15 to G 22 machines reference the same stage family through the related stage 1616578982.
• Item data: 43 × 32 × 41 cm, 47.00 kg, country of origin Belgium, tariff code 8414900090.
• Send Seadweer your old tag code and compressor model, and the exact stage for your build is confirmed before the order.

More Air Ends Available

Other Atlas Copco air end models are available upon request. Please check the table below or contact us for details.