PM1 Generator Maintenance:
The Comprehensive 31-Point Inspection
PM1 Generator Service
Generator Source’s Certified 31-Point Inspection Process
Every quarter, your industrial or commercial generator needs a Preventative Maintenance 1 (PM1) inspection to ensure it’s ready to perform when you need it most. Our comprehensive 31-Point Inspection evaluates every critical system and component, identifying potential issues before they cause failures or costly downtime.
This systematic approach ensures no component is overlooked and provides a complete picture of your generator’s health. Each inspection item has been carefully selected based on decades of field experience and manufacturer recommendations.

PM1 Inspection Items
| Maintenance Item | PM 1 | PM 2 | PM 3 | Load Bank Test |
| Air Inlet System & Air Filters | ✔ | ✔ | ✔ | |
| Alternator | ✔ | ✔ | ✔ | |
| Barrel Insulation | ✔ | ✔ | ✔ | |
| Batteries | ✔ | ✔ | ✔ | |
| Battery Charger | ✔ | ✔ | ✔ | |
| Bearings | ✔ | ✔ | ✔ | |
| Block Heater | ✔ | ✔ | ✔ | |
| Breakers | ✔ | ✔ | ✔ | |
| Collect Oil & Coolant Samples | ✔ | ✔ | ✔ | |
| Controller | ✔ | ✔ | ✔ | |
| Coolant & Coolant Filters | ✔ | ✔ | ✔ | |
| Crankcase Breather(s) | ✔ | ✔ | ✔ | |
| Engine Oil & Oil Filters | ✔ | ✔ | ✔ | |
| Exhaust Manifold | ✔ | ✔ | ✔ | |
| Fan and Fan Drive | ✔ | ✔ | ✔ | |
| Fuel Filters – Primary / Secondary | ✔ | ✔ | ✔ | |
| Fuel Lines | ✔ | ✔ | ✔ | |
| Fuel Tank | ✔ | ✔ | ✔ | |
| Gauges | ✔ | ✔ | ✔ | |
| Governor | ✔ | ✔ | ✔ | |
| Hoses & Connections | ✔ | ✔ | ✔ | |
| Jacket Water Heater | ✔ | ✔ | ✔ | |
| Radiator | ✔ | ✔ | ✔ | |
| Remote Annunciators & Alarms | ✔ | ✔ | ✔ | |
| Safety Controls | ✔ | ✔ | ✔ | |
| Starter | ✔ | ✔ | ✔ | |
| Turbocharger(s) | ✔ | ✔ | ✔ | |
| Vibration Isolators | ✔ | ✔ | ✔ | |
| Voltage | ✔ | ✔ | ✔ | |
| Water Pump | ✔ | ✔ | ✔ | |
| Water Separator | ✔ | ✔ | ✔ | |
| Additional Service Items | ||||
| Change Oil | ✔ | ✔ | ||
| Change Filters (Oil, Coolant, Fuel, Air) | ✔ | ✔ | ||
| Change Coolant | ✔ | |||
| Change Rubber Hoses & Belts | ✔ | |||
| Change Thermostats & Gaskets | ✔ | |||
| Collect Fuel Samples | Upon Request | Upon Request | Upon Request | |
| Transfer Test | Upon Request | Upon Request | Upon Request | |
| Visual ATS Inspection | Upon Request | Upon Request | Upon Request | |
| Change Batteries | Upon Request | Upon Request | Upon Request | |
| Load Bank Test | ||||
| Accurate Temperature Gauge Test | ✔ | |||
| Auto Start Test & Tag Verifications | ✔ | |||
| Check Temperature with Heat Gun | ✔ | |||
| Coolant Leaks | ✔ | |||
| Engine Alternator Test | ✔ | |||
| Full Rating Tests | ✔ | |||
| Gauge Adjustment Tests | ✔ | |||
| Gauge Compliance Tests | ✔ | |||
| Oil Leaks | ✔ | |||
| Pre-Alarm Verification | ✔ | |||
| Shut Down Verification | ✔ | |||
Recommended PM Schedule
(PM1 + All Filters & Oil Change)
(PM2 + Coolant, Hoses, Gaskets & Thermostats Change)
Still have questions or looking for more information?
Generator Source specializes in low-hour, used, new, and surplus generator sets. We have a wide variety of generator sizes and models to fit any project. We are not a broker, we own what we sell.
Call us today (877-866-6895) or click Contact Us to be connected with one of our experienced sales reps.
We have 350+ generators in stock and ready to ship!

