Section 4 — Maintenance
Guardian 40kW
•Add recommended coolant mixture as necessary.
•Periodically remove radiator pressure cap to make sure the coolant recovery system is functioning properly. Coolant should be at bottom of radiator filler neck. If coolant level is low, inspect gasket in radiator pressure cap. Replace cap, if necessary. To have pressure cap tested, contact an authorized service dealer. Inspect cooling system and coolant recovery system for leaks.
4.5.8 CHECK FAN BELT
•Inspect fan belts every three months. Replace any damaged, deteriorated, worn or otherwise defec- tive belt.
•Check fan belt tension. Thumb pressure, exerted midway between pulleys, should deflect about 3/8 to 3/4 inch. Adjust belt tension as required.
4.5.9 INSPECT ENGINE GOVERNOR
4.5MAINTENANCE OWNER/ OPERATOR CAN PERFORM
4.5.1 CHECK ENGINE OIL LEVEL
Refer to “Checking Fluid Levels” in Section 4.4.
4.5.2 CHECK BATTERY
•Check battery fluid level each week as outlined under “Check Fluid Levels”.
•Check battery cables for condition, tightness, cor- rosion or damage. Clean, tighten or replace as necessary.
4.5.3 EXERCISE SYSTEM
If the unit is not set up for automatic operation, start the generator engine at least once every seven days and let it run at least 12 minutes. See Section 3.6, “Weekly Exercise Cycle”.
4.5.4 INSPECT COOLING SYSTEM
•Inspect engine cooling system at least once each month.
•Check hoses for damage, deterioration, leaks, etc. Correct any discrepancies found.
•Check hose clamps for tightness.
4.5.5 CHECK ENGINE COOLANT LEVEL
See “Checking Fluid Levels” in Section 4.4.
4.5.6 PERFORM VISUAL INSPECTION
Complete a thorough visual inspection of the entire
4.5.7 INSPECT EXHAUST SYSTEM
Inspect the exhaust system at least once every three months. Check all exhaust system pipes, mufflers, clamps, etc. for condition, tightness, leaks, security, damage.
Visually inspect electronic governor.
DANGER
DANGER: Do not attempt to adjust the gover-
!nor. Only qualified service dealers should adjust the governor. Excessively high operat- ing speeds are dangerous and increase the risk of personal injury. Low speeds impose a heavy load on the engine when adequate engine power is not available and may short- en engine life. Correct rated frequency and voltage are supplied only at the proper gov- erned speed. Some connected electrical load devices may be damaged by incorrect fre- quency and/or voltage. Only qualified service technicians should adjust the governed speed.
4.5.10 CHANGING ENGINE OIL
Refer to maintenance performed by authorized service dealers for engine oil and filter change frequencies.
Drain the oil while the engine is still warm from run- ning. This means warm up the engine, shut it down and drain immediately as follows:
1.Remove OIL DRAIN HOSE from its retaining clip.
2.Loosen and remove OIL DRAIN HOSE CAP. Drain oil completely into suitable container.
3.When all oil has drained, install and tighten OIL DRAIN HOSE CAP, and
4.Turn OIL FILTER (Figure 4.2) counterclockwise and remove. Dispose of old filter.
5.Apply light coating of new engine oil to seal of new oil filter. Install FILTER and tighten by hand only.
DO NOT OVERTIGHTEN.
6.Remove OIL FILL CAP. Add recommended oil (see
SPECIFICATIONS). DO NOT FILL ABOVE THE DIPSTICK “FULL” MARK. Crankcase oil capacity is 4.0 U.S. quarts (3.8 liters).
After refilling the crankcase with oil, always
!check oil level on dipstick. NEVER OPERATE ENGINE WITH OIL BELOW THE DIPSTICK “ADD” MARK.
Generac® Power Systems, Inc. 17
