5 Warning Signs Your DG Set Needs AMC Now

An Annual Maintenance Contract (AMC) is cheap insurance against the one thing every genset owner dreads: the set failing to start during the exact outage it exists for. Most failures don't happen without warning — here are five signs worth acting on before they become a breakdown call.

If the engine used to fire within a couple of seconds and now takes noticeably longer to catch, that's often an early battery, starter motor, or fuel-delivery issue. It rarely fixes itself and tends to get worse under cold-start conditions.

Black smoke on startup that clears quickly is normal on many diesel sets. Persistent black, blue, or white smoke — especially under steady load — points to a combustion, oil consumption, or cooling-system problem that's worth a technician's look before it escalates.

A genset that's noticeably louder or vibrates differently than it used to, particularly once load comes on, is often flagging a mounting, alignment, or internal wear issue. This is one of the easier things to catch early and one of the more expensive things to ignore.

A genset shouldn't be meaningfully low on coolant or oil between scheduled services. If you're topping up more than the manual suggests, there's a leak or consumption issue that a scheduled AMC visit should catch before it causes an overheating shutdown.

Most CPCB IV+ diesel gensets specify service intervals around 250 running hours or annually, whichever comes first — check your specific model's warranty terms, since skipping a scheduled interval can also void coverage. If you're not tracking hours, an AMC provider will.

Not all AMC contracts are the same, and it's worth knowing what should actually be happening at each visit rather than treating it as a black box. A thorough service typically includes:

• Battery and starting system check — voltage under load, terminal condition, and cold-crank performance, not just a visual look at the battery.
• Fuel system inspection — filter condition, water/contamination check in the fuel tank, and injector performance where accessible.
• Cooling system service — coolant level and condition, radiator cleaning, and a check for leaks around hoses and the water pump.
• Load bank test — running the genset under actual or simulated load, not just an unloaded startup check, since some faults (weak alternator output, cooling issues under load) only show up once load comes on.
• Control panel and AMF function check — confirming the automatic mains failure switching actually works as expected, not just that the panel powers on.

If your current AMC provider's visits consist of a quick startup test and an oil top-up, that's worth a conversation — a real service should touch all of the above, not just the parts that take five minutes.

An AMC covers scheduled, thorough maintenance, but a few quick checks between visits can catch a developing problem before the next scheduled service:

• Note the cranking time each time the genset starts, even informally — a gradual increase over a few weeks is the earliest version of warning sign #1.
• Glance at coolant and oil levels at a consistent interval (weekly is reasonable for most commercial installations) so a slow leak shows up as a trend, not a surprise.
• Listen for changes during routine test-runs, if your facility does them — most operators run a genset periodically even without an outage, and that's the easiest moment to notice something's different.

If any of these sound familiar, don't wait for the next outage to find out how serious it is — contact a dealer near you through our dealer directory.