What this page covers – and what it does not
If you want to know what an annual maintenance contract typically includes and how we offer one, see our compressor AMC page. This page covers the other half of the job: how a plant engineer or maintenance manager chooses between contract offers, writes clear terms, and then manages the contract through the year so it delivers reliable air rather than a file of signed visit sheets.
The same principles apply whether you buy a basic preventive-visit contract, a comprehensive contract with parts, or a mixed arrangement across several brands in one compressor house.
Which type of service contract fits your plant?
| Contract type | Usually includes | Usually excludes | Suits |
|---|---|---|---|
| Labour-only preventive | Scheduled visits, inspection, readings, report | Parts, oil, breakdown labour | Plants with their own parts stores and in-house staff |
| Preventive with consumables | Visits plus filters, separator, oil at scheduled intervals | Breakdown parts, major repairs, airend work | Most general industry with steady duty |
| Preventive plus breakdown labour | Above, plus labour for unplanned calls | Major parts, overhaul, third-party items | Single-machine sites with no standby |
| Comprehensive | Visits, consumables and most repair parts within defined limits | Misuse, external damage, defined major items | Critical air where budget certainty matters |
| Call-out / rate contract | Agreed rates for visits and parts when needed | Any scheduled commitment | Low-hours or standby machines |
Choose the type by criticality first. A sole compressor feeding a pharma line or a continuous process deserves different terms from a standby unit that runs a few hours a week. Our guide to criticality classification and service levels explains how to rank machines before you negotiate.
How to define scope so nothing is assumed
Most contract disputes start with a sentence like “complete maintenance of compressors”. Replace general wording with lists.
- Asset schedule: each machine by make, model, serial number, location and running hours at the start. Include dryers, filters, drains and receivers only if you mean to.
- Task schedule: which tasks happen at which running hours or calendar points, based on the manufacturer’s schedule and your duty. Our interval optimisation guide explains how to tune these.
- Parts and consumables: which items are included, whether genuine or approved equivalent parts are used, and who supplies the lubricant.
- Diagnostics: whether readings such as dP, discharge temperature, pressure dew point and vibration are taken at each visit, and whether oil analysis is included.
- Breakdown work: whether labour, parts or both are included, and any limits.
- Major items: airend overhaul, motor rewinding, controller replacement, cooler replacement – almost always separate and quoted when needed.
- Customer duties: access, isolation permits, daily checks, room ventilation, power quality and safe working conditions.
- Exclusions: misuse, unauthorised repairs, contaminated intake, water or power faults, and any third-party equipment.
Response definitions: what “response” should actually mean
“Response within X hours” can mean a phone call, a technician leaving the office, arrival on site or the machine running again. These are very different promises. Write each one separately and only include commitments both sides have agreed commercially.
| Term | Meaning to agree | Practical note |
|---|---|---|
| Acknowledgement | Call logged and a named person responds | Use one call log or WhatsApp group so time is recorded |
| Remote diagnosis | Fault discussed using alarm codes, photos and readings | Often fixes simple faults without a visit |
| Attendance | Technician on site | Depends on distance, so define it per site and per priority |
| Restoration | Air supply restored, possibly temporarily | May need parts or a temporary machine |
| Permanent repair | Root cause fixed and machine returned to normal duty | Often follows restoration after parts arrive |
Set priority levels in the contract: for example, total loss of air, reduced capacity, and non-urgent defects. Agree what happens if parts are not available locally, and whether a temporary compressor from a rental fleet is part of the plan. For critical lines, a pre-agreed temporary air arrangement for breakdowns is often worth more than any response clause.
Parts, pricing and change control
Parts cause more friction than labour. Agree up front:
- How parts are identified – from nameplate, serial number and old part – and confirmed before quoting.
- Whether genuine, OEM-equivalent or approved aftermarket parts are acceptable for each item, and how warranty conditions affect that choice.
- How parts outside the contract are quoted and approved, and who signs off.
- Which critical spares the plant keeps on site, such as a filter kit, separator, oil and drive belt, so a scheduled visit is never delayed.
- How price changes during the year are handled, if at all.
Use a simple change-control rule: any work outside scope needs a written quote and approval before it starts, except an agreed emergency limit. This protects both sides.
What every visit report should contain
The visit report is the evidence that the contract is working. A signature on a blank sheet tells you nothing. Insist that each report records:
- Machine identity, date, running hours and loaded hours.
- Tasks completed against the schedule, and any tasks deferred with the reason.
- Readings: delivery pressure, discharge temperature, separator and filter dP, ambient temperature, and dryer dew point where included.
- Parts and oil replaced, with quantities.
- Defects found, their severity and recommended action.
- Alarms or trips since the last visit, from the controller history.
- Next due service and any items the plant must arrange.
Ask for reports in a form you can keep – PDF or a shared sheet – so trends can be compared across visits. Readings from one visit mean little; readings from twelve visits show a cooler fouling or a separator loading long before a trip.
KPIs that keep a contract honest
Choose a few measures both sides can see and influence. Review them at a short meeting every quarter.
| KPI | How to measure | What it reveals |
|---|---|---|
| Scheduled visits completed on time | Visits done within the agreed window ÷ visits due | Planning discipline |
| Unplanned stoppages | Count per machine per quarter, with cause | Whether PM is preventing failure |
| Repeat faults | Same fault on the same machine within one service interval | Root-cause quality |
| Response performance | Logged times against each agreed definition | Whether commitments are realistic |
| Open defects | Defects reported but not yet closed, with age | Whether recommendations are acted on – by either side |
| Report completeness | Reports with all required readings | Quality of evidence |
Many unplanned stops trace back to defects the provider reported and the plant did not approve. Track open defects honestly; it keeps the conversation factual rather than blame-based.
Reviewing and renewing the contract
Treat renewal as an engineering review, not a purchase-order formality. About two months before expiry:
- Compile the year’s visit reports, breakdown log and KPI summary.
- Check the asset list: machines added, retired, relocated or moved to standby.
- Compare running hours with the hours assumed when the contract was priced.
- Identify machines nearing major work such as an airend overhaul, and decide whether that belongs inside or outside the contract.
- Agree changes to intervals based on oil analysis and dP trends.
- Rewrite unclear clauses that caused arguments during the year.
- Consider whether an air audit is due – leaks, pressure settings and demand often change more than the compressors do.
A contract that improves each year, with fewer breakdowns and clearer scope, is worth more than one that is simply cheaper.
How Reddy Compressors helps
We have served industry since 2002 as an independent multi-brand specialist, working on Atlas Copco, Ingersoll Rand, ELGi, KAESER, Chicago Pneumatic, Gardner Denver, Sullair, Doosan, Kirloskar, Bobcat and many other makes. That lets one contract cover a mixed compressor house.
- Help you draw up an asset schedule and task schedule for each machine.
- Offer service contracts and AMCs with scope, exclusions and response terms written out clearly – details on our AMC page.
- Provide visit reports with readings, parts used, defects and next actions.
- Identify spare parts from the nameplate and confirm fit before quoting.
- Support breakdown repair, overhaul, temporary rental air from 50–2,000 cfm, and air audits when the review shows a need.
- Review an existing contract you hold with another provider and point out gaps.
Our office is at Tarnaka, Secunderabad, and our service teams cover the whole of Telangana and Andhra Pradesh. Equipment, rentals and spares are supplied across India.
What to send us
- A list of compressors, dryers and related equipment with make, model, serial and nameplate photos.
- Running hours and typical operating pressure for each machine.
- Your current contract or the scope you want quoted.
- Last year’s service reports and breakdown history, if available.
- Which machines are critical and which are standby.
- Site location, working hours and access or permit requirements.
Frequently asked questions
What should a compressor service contract include?
It should list every covered machine by serial number, the tasks and intervals, which parts and lubricants are included, how breakdowns are handled, what response terms mean, exclusions, customer responsibilities and what each visit report must record. Clear lists prevent disputes later. Anything major, such as airend overhaul, should be stated as included or quoted separately.
What is the difference between an AMC and a comprehensive maintenance contract?
The terms are used loosely in India. A basic AMC usually covers scheduled preventive visits, sometimes with consumables. A comprehensive contract normally adds breakdown labour and most repair parts within stated limits, so the plant has more budget certainty. Always read the inclusions and exclusions lists rather than relying on the name of the contract.
How do I measure if my compressor service provider is doing a good job?
Track a few agreed KPIs: scheduled visits completed on time, unplanned stoppages, repeat faults, response against each agreed definition, open defects and completeness of visit reports. Review them quarterly with the provider. Falling breakdowns, consistent readings in reports and defects closed promptly are better signs than the number of visits made.
Should a compressor AMC include spare parts?
It depends on how you prefer to manage cost and risk. Including scheduled consumables such as filters, separator and oil is common and simplifies planning. Including breakdown parts gives budget certainty but raises the contract price. Whatever you choose, define how parts are identified, which grades are acceptable and how out-of-scope parts are quoted and approved.
Can one service contract cover compressors of different brands?
Yes, if the provider works across brands. An independent multi-brand service team can cover mixed screw, reciprocating and portable machines, plus dryers, under one schedule and one reporting format. Make sure the asset list names each machine and that parts terms are clear for each make, especially for machines still under the manufacturer’s warranty.
What should I check before renewing a compressor maintenance contract?
Review the year’s visit reports, breakdown log and KPIs. Check that the asset list and running hours still match reality, identify machines approaching major work, adjust intervals based on oil analysis and pressure-drop trends, and rewrite any clauses that caused disagreement. Renewal is the best time to fix scope rather than repeat the same terms.
Related pages
Technical content reviewed by D. Srinivas Reddy, Managing Partner and service engineer, Reddy Compressors. Last updated 17 October 2026. How our engineering content is reviewed.