The airend in context
The airend is the compression element of a screw compressor, and it is the most valuable single part of the machine. Its condition decides output, efficiency and reliability, so the decision to repair or replace it should rest on evidence.
Understand why it failed
Before choosing a route, find out why the airend failed. Common causes include contaminated or wrong lubricant, an intake filter failure, overheating, bearing wear, running outside the intended conditions or lack of maintenance. If the cause remains, a rebuilt or new airend can fail the same way.
The three routes
A rebuild repairs the existing unit by replacing bearings, seals and other worn parts and re-checking clearances. It suits cases where the rotors and housing are sound and the specialist capability is available.
An exchange swaps your unit for a reconditioned one, which can shorten downtime because the work is done off the machine. The terms matter: what is replaced, what is tested and what is warranted.
A replacement fits a new airend. It offers a fresh start and a clear warranty, at higher first cost, and it may suit an older machine whose other parts also need attention.
What to compare
Compare the options on:
- Cost of the work and any parts
- Time to return to service
- Condition and age of the rest of the machine
- Warranty and what it covers
- Expected remaining life and the cost of failure
- Availability of parts and of competent service
What to ask for
Whichever route you choose, ask for:
- An inspection report that identifies the failure mode
- A clear scope of work and what is replaced
- Test results, such as running checks after the work
- The warranty terms in writing
- Advice on preventing the same failure
Our approach
We help you gather the evidence, compare the routes using your machine's history and the cost of downtime, and plan the work. We do not claim a rebuild or exchange capacity beyond what has been confirmed for the specific airend, and we state the supply status of any part or unit in the quotation.
Frequently asked questions
Is rebuilding always cheaper than replacing?
Not always. If the damage is severe or the machine is old, replacement or exchange may give a better total outcome. Compare the full cost over the remaining life.
How long does an airend rebuild take?
It depends on the damage, parts availability and the workshop. We confirm a realistic time after inspection.
Will a rebuilt airend perform like a new one?
It can if the work is done correctly and the cause of failure is removed, but the result depends on the condition of the parts and the quality of the work. Ask for test results.
What does an exchange unit warranty cover?
The terms vary. Ask for the scope, the duration and the conditions in writing.
Can I avoid an airend failure?
Good maintenance helps: clean intake air, the right lubricant and filters, correct operating temperature and timely service.