In short. A generator AMC is a written annual agreement that fixes which generators are covered, how many scheduled visits they get, what each visit includes, whether consumables and parts are inside or outside the price, and how breakdown calls are handled. The useful ones are specific about exclusions and reporting. An AMC does not add capacity or guarantee uninterrupted supply; it buys disciplined maintenance and a known response arrangement.
What an AMC is for
Most generator failures we attend in Hyderabad are not sudden. They are the end of a slow decline that nobody was watching: a battery that had been weak for a year, a radiator core half blocked with dust, a fuel tank with water in the bottom. The purpose of an annual maintenance contract is to put a competent person in front of the machine at fixed intervals with a defined checklist, so that decline is recorded and corrected before an outage exposes it. The contract turns preventive maintenance from a good intention into a calendar commitment with a named supplier.
For the customer the second benefit is priority. When the set does fail, a contract customer with a known machine, known history and agreed response terms is dealt with faster than an unknown caller, because half the diagnosis is already on file.
The three common contract structures
Suppliers in India use different names, but almost every generator AMC falls into one of three shapes. The names matter less than the boundary each one draws.
| Structure | Included | Billed separately | Suits |
|---|---|---|---|
| Labour-only (non-comprehensive) | Scheduled visits, inspection, servicing labour, reports, breakdown attendance within agreed terms | All oil, filters, coolant, batteries, parts and repair labour beyond the visit | Sites with a competent stores function that prefer to buy parts themselves |
| Semi-comprehensive | Everything above plus defined consumables such as engine oil, oil, fuel and air filters and coolant at scheduled changes | Batteries, belts, hoses, injection equipment, electrical components, major repairs | Most commercial standby sets, where predictable servicing cost is the goal |
| Comprehensive | Scheduled service, consumables and listed replacement parts and repair labour, subject to exclusions | Items outside the listed scope, damage from misuse, overload, fuel contamination, accident, flood or fire, and usually major overhaul | Critical sites that want one annual figure and minimal procurement during the year |
No comprehensive contract covers everything. The exclusions clause is where the real scope lives, and it should be read before the price.
Clauses that decide whether the contract works
Equipment schedule
Each set listed by make, model, rating, serial number, location and hour-meter reading at the start of the contract. A contract that says “two generators at the factory” invites a dispute when a third one appears or one is replaced.
Visit frequency and content
The number of scheduled visits per year, typically two to four for standby sets and more for prime-power duty, and a checklist for each visit type. The checklist should name the systems inspected, the measurements taken and the point at which a load test is included, because a load test needs either a plant shutdown or load bank testing and must be planned.
Consumables and parts
State by name what is included: oil grade and quantity per change, filter part numbers, coolant type. State who supplies parts outside the scope, who approves them and at what price basis. The commonest AMC argument is a customer who assumed batteries were covered.
Breakdown response
Response terms should be written and realistic. A promise of attendance within a fixed number of hours depends on location, technician availability, site access and whether parts are in stock, and a contract that pretends otherwise is not worth having. A sound clause states working-hours and after-hours arrangements, how a call is logged, who confirms attendance and how parts needed during a breakdown are approved. Repair labour on a breakdown may be inside or outside the contract; the document must say which.
Reporting and escalation
Every visit produces a report showing hours, work done, readings, findings and recommendations with a priority. Urgent findings, such as a battery about to fail or a coolant leak, should trigger a defined escalation to a named person on the customer side rather than waiting for the next quarterly review.
What an AMC does not do
An AMC does not increase the kVA available, does not make a wrongly sized set adequate and does not keep the plant running while the generator is being serviced. If continuity during service matters, the contract should identify a shutdown window or a temporary rental generator arrangement. An AMC also does not substitute for repair of a known defect; a set entering a contract with a pre-existing fault should have that fault listed and priced separately so that the first visit does not become an argument about scope.
Older brochures from any supplier, including our own, describe service in general terms. The contract document is what governs, and the useful test is simple: when a fault occurs at night, can the shift electrician read the contract and know what to do, whom to call and what is covered?
Comparing AMC quotations
Three quotations with three different prices usually describe three different scopes. Compare them line by line on visit count, checklist depth, consumables included, parts policy, response terms, load testing, reporting format and exclusions. Ask each supplier for a sample service report and a copy of their standard checklist. A low price with two visits and no consumables can cost more over the year than a semi-comprehensive contract once the oil, filters and call-out charges are added. Where the generator is old or its history unknown, ask for a condition assessment before the contract starts; the findings may redirect money from a contract into a root-cause investigation of a chronic problem or into replacement planning.
Related photographs and videos
Common mistakes
- Signing a contract that lists “preventive maintenance” without a checklist, which lets the visit shrink to an oil top-up and a signature.
- Assuming batteries, belts and hoses are included because the contract is called comprehensive, which produces an unbudgeted invoice at the first failure.
- Accepting a guaranteed response time that no supplier can honour at a remote site, which creates a contractual dispute instead of a repaired generator.
- Never reading the service reports, so recommendations about a weak battery or a blocked radiator are filed and then rediscovered during an outage.
- Starting a contract on a generator with an unresolved fault and no baseline inspection, which makes every later problem a disagreement about whether it was pre-existing.
What to send us
For an AMC proposal send the list of generators with make, rating, serial numbers and locations, nameplate photographs, current hour-meter readings, approximate annual running hours, the last service date and any recent service reports or recurring faults. Tell us which sites can be shut down for load testing and which cannot, and whether you want labour-only, semi-comprehensive or comprehensive cover. Use the service and AMC enquiry form.
Questions engineers ask
How many visits a year should a generator AMC include?
For a standby set running under 250 hours a year, two to four scheduled visits is typical, with site staff doing weekly checks in between. Prime-power sets on continuous or daily duty need visits tied to running hours, often monthly, because they reach oil change intervals quickly. The engine manufacturer’s schedule sets the minimum.
Is a comprehensive AMC worth the higher price?
It is worth it where the generator protects a critical process and the customer wants a single annual cost with no procurement delays during the year. For a lightly used standby set in good condition, a semi-comprehensive contract with consumables included usually gives most of the benefit at lower cost. In both cases read the exclusions before comparing prices.
Does an AMC cover breakdown repairs?
Attendance at breakdowns is normally included; repair labour and parts may or may not be, depending on the structure. Labour-only contracts bill repair work separately. Comprehensive contracts include listed repairs but exclude damage from misuse, overload, contaminated fuel, flooding and similar external causes, and usually exclude major overhaul.
Can one AMC cover generators of different makes?
Yes, provided the supplier has the manuals, tools and parts access for each make. The equipment schedule should list each set individually with its own service intervals, since a Cummins, a Kirloskar and a Perkins engine on the same site may have different oil capacities, filter numbers and valve adjustment schedules.
What happens if the generator fails between scheduled visits?
The breakdown clause applies: the site logs a call, the supplier confirms attendance under the agreed working-hours or after-hours terms, the fault is diagnosed and any parts or repair labour outside the contract are quoted for approval. The visit is recorded in the same service file so that the history stays complete.
What does an AMC cost? See what decides the AMC price and how to compare two quotations fairly.
Generators by rating
- Under 15 kVA generators
- 15–50 kVA generators
- 50–125 kVA generators
- 125–250 kVA generators
- 250–500 kVA generators
- 500–1000 kVA generators
- 1–2 MVA generators
- 2 MVA and above generators
Technical content reviewed by Srinivas Reddy, Managing Partner, Reddy Generators. Last updated 19 October 2026.