Master Lock MGR2900A, MGR4500I, MGR6000I Maintenance And Repairs, High Altitude Operation

OWNER’S MANUAL

OPERATION

Continued

HIGH ALTITUDE OPERATION

This generator will not perform well at high altitudes without proper adjustment. See engine owner’s manual for details.

ADDING ELECTRICAL

LOADS

IMPORTANT: Do not overload generator. Make sure total wattage of all electrical loads does not exceed rated wattage of generator. Overloading may shorten generator life. It could also cause internal damage to genera- tor. Overloading will trip circuit breaker.

IMPORTANT: (All models except MGR2900A) Keep voltage selector switch in the 120 VOLT ONLY position if only powering 120V items. Only move switch to 120 + 240 VOLT position if powering 240V items.

1.Check items to be powered. Their nameplate lists their wattage ratings.

Note: The wattage ratings for some electrical motors are misleading. They may require up to three-times their rated wattage to start. You must figure total electrical load wattage. Make sure total wattage of all electrical loads does not exceed rated wattage of generator. See Determining Electrical Load For Generator, page 9.

2.Start engine. Let engine reach full speed.

3.Connect electrical loads one at a time. If the load consists of electric motors, start them first. Always start the largest first. Start each motor individually.

DISCONNECTING ELECTRIC LOADS

Remove electrical loads one at a time. Re- move voltage sensitive items first. Voltage sensitive items include TVs, VCRs, and other home electronic items.

STOPPING ENGINE

IMPORTANT: The engine speed is preset. The throttle is locked in preset position. Do not adjust throttle.

Follow the steps below to stop engine.

1.Remove all electrical loads from genera- tor (see Disconnecting Electrical Loads). Remove electrical loads one at a time.

2.Let engine run for two or three minutes after removing electrical loads. This lets engine cool slightly.

3.Turn engine switch to the OFF position (see Figure 18).

4.Turn fuel valve lever off except on Model MGR6000I. Do this by moving valve lever fully to the left (see Figure 19).

ENGINE SW

ON

OFF

Figure 18 - Engine Switch In OFF Position

CLOSED

OPEN

Fuel Valve Lever

(Off Position)

Figure 19 - Fuel Valve Lever Off (Model MGR4500I Shown)

MAINTENANCE AND REPAIRS

WARNING: Only a qualified electrical service person should service and repair the alternator onthisgenerator.Useonlyfactory approved replacement parts.

CAUTION: The engine speed is preset. The throttle is locked in preset position. Do not adjust throttle. Preset position lets en- gine run at 3600 RPM under load. The engine must maintain 3600 RPM for generator to create cor- rect voltage. Running engine at lower speeds will damage genera- tor and powered items.

CAUTION: Shut off generator before performing maintenance.

IMPORTANT: Keep generator level when servicing. Never turn generator upside down or stand it on end to service.

Note:We supply the engine owner’s manual with generator. Refer to that manual for questions concerning engine maintenance and repairs.

Non-engine parts require little maintenance. Keep generator clean. Use a damp cloth to clean outside surfaces. Never use water to clean generator. Water can cause damage to internal parts. Use vacuum to clean air inlet and outlet louvers of alternator.

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