Generator Specs & Maintenance Schedule Lookup
Instant factory oil capacities, valve lash clearances, spark plug gaps, and maintenance cadences for top commercial and residential generators.
Guardian Series (Air-Cooled)
Engine: G-Force 800 / 999cc V-Twin OHV (816cc - 999cc)
5W-30 Full Synthetic
Capacity: 1.9 Quarts
0.020 in (0.5 mm)
Champion RC12YC / Generac 0G0767A
Intake: 0.002 - 0.004 in (cold)
Exhaust: 0.002 - 0.004 in (cold)
Group 26R
Min 525 CCA
Factory Maintenance Intervals
Initial Oil & Filter Change
Drain factory break-in oil, install new filter, inspect for oil leaks.
Annual Preventive Maintenance
Replace 5W-30 synthetic oil & filter, replace air filter, check battery float voltage (13.5V-13.8V).
Major Tune-Up & Valve Lash
Replace spark plugs (gap 0.020"), adjust valve lash clearances to 0.002-0.004", test exercise cycle.
Protector Series (Liquid-Cooled Diesel)
Engine: Inline 4-Cylinder Turbo Diesel (2.4L - 3.4L)
15W-40 CK-4 Heavy Duty Diesel
Capacity: 6.5 Quarts
Compression Ignition (Diesel)
N/A
Intake: 0.008 in (cold)
Exhaust: 0.012 in (cold)
Group 24 / Group 31
Min 650 CCA
Factory Maintenance Intervals
Initial Oil & Fuel Filter Service
Drain engine oil, replace primary fuel filter & water separator.
Oil, Filters & Coolant Check
Change 15W-40 oil, fuel filters, inspect belts and 50/50 ethylene glycol coolant.
Coolant Flush & Battery Replacement
Flush cooling system, pressure test radiator cap, test block heater operation.
RCA / RESV Series (Air-Cooled)
Engine: Kohler Command PRO CH740 / CH1000 (725cc - 999cc)
5W-30 Full Synthetic
Capacity: 2 Quarts
0.030 in (0.76 mm)
Champion XC12YC / Kohler 25 132 12-S
Intake: Hydraulic lifters (zero lash check)
Exhaust: Hydraulic lifters (zero lash check)
Group 26R / Group 51R
Min 500 CCA
Factory Maintenance Intervals
Initial Oil Change
Replace oil and filter, inspect fuel connections with sniffer/bubbles.
Annual Service
Change engine oil, oil filter, air filter, inspect battery charger output.
Ignition & Electrical Service
Replace spark plugs (gap 0.030"), clean slip rings, test ATS emergency transfer.
QuietConnect Series (Liquid-Cooled Gas)
Engine: QSG2.4 / QSJ2.4 L4 Gaseous (2.4L Inline 4)
5W-30 Full Synthetic (Low Ash)
Capacity: 4.5 Quarts
0.028 in (0.71 mm)
Denso / Cummins OEM
Intake: 0.010 in (cold)
Exhaust: 0.012 in (cold)
Group 26 / Group 34
Min 575 CCA
Factory Maintenance Intervals
First Oil Change
Drain break-in oil, install Cummins oil filter, retorque clamps.
Annual PM Service
Engine oil, filter, air filter, fuel gas regulator pressure check.
Valves, Plugs & Cooling System
Adjust valve lash, replace spark plugs, flush coolant, test load transfer under building load.
DE / C-Series Commercial Diesel
Engine: Cat C4.4 / C7.1 ACERT Diesel (4.4L - 7.1L Turbocharged Aftercooled)
Cat DEO-ULS 15W-40
Capacity: 11 Quarts
Compression Ignition (Diesel)
N/A
Intake: 0.010 in (0.25 mm)
Exhaust: 0.020 in (0.50 mm)
Group 31 (24V System - 2 Batteries in Series)
Min 950 CCA
Factory Maintenance Intervals
30-Minute Operational Run
Run under building load >=30% nameplate, log oil pressure, water temp, frequency (60 Hz).
Fuel & Battery Analysis
Specific gravity testing, fuel sample water/microbe check, jacket water heater test.
Full PM & Load Bank Test
Cat 15W-40 oil change, primary/secondary fuel filters, 2-hour or 4-hour load bank certification.
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