Generac Diesel Generators MDG250DF4-STD: General Maintenance

Before servicing the unit, always follow the instructions listed below.

• Verify the Control Power switch is turned to the OFF (O) position

• Verify the circuit breakers are turned to the OFF (O) position.

• Activate (push in) the emergency stop switch.

• Disconnect the negative (-) terminal on the battery.

• Attach a “Do Not Start” sign to the control panel. This will notify everyone that the unit is being serviced and will reduce the chance of someone inadvertently trying to start the unit.

• Never wash the unit with a high pressure hose or with any kind of power washer.

• Never wash the engine block or fuel tank with a power washer or steam cleaner. Water may enter the cabinet and collect in the generator windings or other electrical parts, causing damage.

• If the unit is stored outside, check for water inside the cabinet and generator before each use. If wet, dry the unit thoroughly before starting.

• Inspect condition of electrical cords. DO NOT use the unit if insulation is cut or worn through

• Check the wheel lugs. Refer to “Towing the Unit”.

• Check the coolant level daily. Refer to the engine operator’s manual for coolant recommendations and proper mixture. ○ Coolant is checked visually by inspecting the level in coolant overflow jug located near the radiator. ○ Normal operating level is between the full and add markings on the overflow jug known as normal range. ○ WHEN ENGINE IS STOPPED AND COMPLETELY COOL, coolant may be added directly to the coolant overflow jug.

• Check the oil level daily. Refer to the engine operator’s manual for the proper viscosity grade of oil, including special operating conditions such as a change in season or climate. ○ DO NOT start the unit if the engine oil level is below the add mark on the dipstick. Normal operating level is in the cross-hatch pattern between the full and add markings on the dipstick. ○ Add oil only if the oil level is below the add mark on the bottom of the cross-hatch pattern on the dipstick. DO NOT OVERFILL the crankcase.

• Check the fuel level.

• If the unit is connected to a remote start or transfer switch, make sure the remote switch is also off and tagged.