Generac Gaseous Generators MGG450: Daily Walk Around Inspection Maintenance

When the unit is not running:

• Visually inspect the fan belt for cracks, fraying and stretching. Ensure the belt is properly seated in the pulley grooves. At 500 hours it is recommended that the belt be removed and checked for wear. While the belt is removed, inspect pulleys and bearing. Rotate and feel for hard turning or unusual sounds.

• Coolant should be checked daily. Visually check the coolant expansion tank and make sure the coolant level is between the Cold and Hot level markings. Add coolant to the expansion tank when the engine is cool (not at operating temperature/not running). Add a 50/50 mixture of the correct antifreeze and distilled or deionized water to the coolant system.

• Inspect the tire pressure. Refer to “Specifications” on page 5 for maximum tire pressure.

• Check electrical connectors, battery and battery disconnect connections, and ground points. Look for loose or missing hardware.

• Check all flexible rubber hoses for deterioration.

To check the engine oil using the dipstick:

• Locate the engine oil dipstick.

• The most accurate oil level readings are measured when the engine is cold. If the engine was running, wait at least 10 minutes before proceeding.

• Remove the dipstick and wipe it dry with a clean, lint free cloth.

• Slowly insert the clean dipstick into the tube. Visually confirm that the dipstick is fully seated in the dipstick tube. A visual inspection is required because some dipsticks will require more effort than others to fully seat.

• After 10 seconds remove the dipstick.

• Look at the oil level on both sides of the dipstick. The lower of the two readings will be the correct oil level measurement.

• Add oil (if necessary) to adjust the level. After adding or changing the oil, the engine should run for one minute before checking the oil level. Remember to wait 10 minutes to allow the engine to cool and oil to fully drain into the oil pan.

Typical causes of inaccurate oil level readings:

• Reading the high level of the dipstick.

• Reading the dipstick before the oil fully drains into the oil pan

• Inserting and removing the dipstick too quickly

• The dipstick is not fully seated in the dipstick tube

Note: When changing oil, it is not necessary to drain the oil from the reservoir.

• Close the valve below the oil reservoir.

• Place a bucket below the oil drain hose, located on the right side of the frame.

• Remove the oil drain plug.

• Open the drain valve, located below the front of the engine

• Allow the oil to drain completely into the bucket.

• Remove the oil filter.

• Place a new gasket on the new oil filter and install, turning one turn after initial gasket contact.

• Close the engine oil drain valve and reinstall the hose plug.

• Remove the oil fill cap on the engine valve cover and add fresh oil.

• Open the oil reservoir valve

• Top off the oil in the reservoir.

Check Coolant Level

• Add coolant to the expansion tank only when the engine is cool (not at operating temperature).

• Visually check the coolant expansion tank and make sure the coolant level is between the cold and hot level markings. To add coolant to the system, add it to the expansion tank when the engine is cool (not at operating temperature, not running). Add only a 50/50 mixture of the correct antifreeze and distilled or deionized water to the coolant system.

• DO NOT dispose of the battery in a fire. The battery is capable of exploding

• DO NOT open or mutilate the battery. Released electrolyte can be toxic and harmful to the skin and eyes.

• The battery represents a risk of high short circuit current. When working on the battery, always remove watches, rings, or other metal objects, and only use tools that have insulated handles.

• An authorized operator should inspect the engine battery system monthly. At this time, the battery fluid level should be checked and distilled water added if needed. Battery cables and connections should also be inspected for cleanliness and corrosion.

• Once every six months, an Authorized Service Technician should inspect the battery system. At this time the battery condition and state of charge should be checked using a battery hydrometer. The battery should be recharged or replaced as required.

• Servicing of the battery is to be performed or supervised by personnel knowledgeable of batteries and the required precautions. Keep unauthorized personnel away from batteries.

Observe the following precautions when working on batteries:

• Remove the 10A F2 fuse from the generator control panel.

• Remove watches, rings, or other metal objects.

• Use tools with insulated handles.

• Wear rubber gloves and boots.

• Do not lay tools or metal parts on top of the battery

• If applicable, disconnect the charging source prior to connecting or disconnecting battery terminals. Remove the battery charger fuse (ATC style fuse, 5 amp on the 2.5 charger and 15 amp on the 10A charger).

• Wear full eye protection and protective clothing.

• Where electrolyte contacts the skin, wash it off immediately with water.

• Where electrolyte contacts the eyes, flush thoroughly and immediately with water and seek medical attention.

• Spilled electrolyte is to be washed down with an acid neutralizing agent. A common practice is to use a solution of 1 pound (500 grams) bicarbonate of soda to 1 gallon (4 liters) of water. The bicarbonate of soda solution is to be added until the evidence of reaction (foaming) has ceased. The resulting liquid is to be flushed with water.

Lead-acid batteries present a risk of fire because they generate hydrogen gas.

• DO NOT SMOKE when near the battery.

• DO NOT cause flame or spark in battery area.

• Discharge static electricity from the body before touching the battery by first touching a grounded metal surface.

Daily Maintenance Procedure:

• Walk Around Inspection

• Check Oil Level

• Check Coolant Level

• Check Electrical Wiring

• Check Belts

• Inspect Radiator for Signs of Obstruction or Damage

• Inspect Gas Piping and Hoses for Leaks and Damage

The following inspections should be performed by a qualified/authorized service technician, or a properly trained authorized operator. These maintenance items require a high level of experience and skill to evaluate and correct.

• Inspect engine accessory drive belts

• Inspect hoses and connections

• Inspect fuel supply system

• Inspect exhaust system

• Inspect exhaust blankets. Replace if deteriorated.