Magnum MLT4200IF4 Generator Set

⚠ Allow engine to cool before troubleshooting

1. Check the coolant level in the overflow jug
2. Restart and verify a high coolant temperature shutdown; stop immediately if coolant reaches 210°F (99°C)
3. Allow the engine to cool, then add coolant to the overflow jug and radiator as needed
4. Check the radiator shroud and ducting for blockage
5. Inspect coolant hoses, engine block, and water pump for leaks
6. Check the serpentine drive belt tension for the water pump
7. Remove the load, restart, and monitor coolant temperature; shut down immediately if it overheats again

⚠ Allow engine to cool before troubleshooting

1. Check engine oil level with the dipstick and add oil if required
2. Visually inspect the engine for oil leaks
3. Restart and verify oil pressure does not read above 5 psi (34 kPa) within 5 seconds, or shut down immediately
4. Check the oil pressure sender; refer to the engine operator's manual for corrective action

⚠ Only a qualified electrician should troubleshoot or repair electrical problems

1. Clean the fixture reflector and both sides of the lens with mild soap and water
2. Replace the bulb if worn from normal use
3. Check the mast coil cord, junction box, and light connections
4. Verify generator output is 120V +/-5V; adjust the voltage regulator if incorrect
5. Check transformer output (should strike near 400VAC then stabilize 240-260VAC); check capacitor/coil if incorrect

⚠ Keep area above the unit clear of overhead wires and obstructions; mast extends to 30 ft (9.14 m)

1. Locate the unit at or above the area to be illuminated
2. Place unit on firm, flat ground and block the wheels
3. Rotate the tongue jack 90° and raise the trailer tongue off the tow vehicle
4. Connect a good earthen ground to the grounding stud near the trailer tongue
5. Extend and lock the outriggers, then rotate and lower the outrigger jacks
6. Level the trailer using all four jacks
7. Adjust and aim the lamps, then tighten hardware and connect to the junction box

⚠ Stop immediately if the mast hangs up or the winch cable develops slack

1. Shut down lights and engine; let lights cool 10-15 minutes
2. Loosen the mast rotation knob, align the white arrows, and retighten
3. Turn the upper mast winch handle counterclockwise to collapse the mast, keeping the electrical cord clear
4. Release the mast lock and lower the mast into the transport cradle with the lower winch
5. Insert and secure the mast cradle locking pin

1. Confirm the main breaker and light breakers are OFF
2. Move the Control Power switch to ON
3. Press the Start button on the Home screen to begin the startup sequence
4. If the engine fails to start on the first crank, it pauses 15 seconds then retries, up to three total crank cycles
5. If it fails after three cycles, the Fail to Start alarm shows; wait 2 minutes for the starter to cool before retrying
6. Once running, allow the engine to reach 1800 rpm and warm up
7. Check for excessive noise, vibration, or coolant/oil/fuel leaks before loading
8. Confirm frequency reads about 60 Hz with no load
9. Switch the main breaker ON, then switch on receptacle loads as needed
10. Allow the engine to reach normal operating temperature before switching on loads

⚠ Never raise or lower the mast while the unit is operating

⚠ Stop immediately if the winch cable develops slack or a mast section sticks

1. Set up and level the unit with outriggers extended
2. Remove the mast cradle locking pin
3. Check mast cables and electrical cord for wear or damage
4. Clear the area around the unit before raising the mast
5. Remove the safety pin from the mast lock bar and raise the mast with the lower winch until it locks; reinsert the safety pin
6. Telescope the mast to desired height with the upper winch, watching the electrical cord
7. Rotate the mast to the desired direction and tighten the rotation knob

1. Remove all loads from the receptacles
2. Switch each light circuit breaker OFF
3. Switch the main circuit breaker OFF
4. Press the Stop/Reset (O) button
5. Move the Control Power switch to OFF after the unit shuts down

1. Raise the rear jack and outrigger jacks into travel position and lock the pins
2. Slide outriggers into the frame and lock the pins
3. Raise or lower the trailer onto the tow vehicle hitch with the tongue jack; attach safety chains
4. Grease the leveling jack fittings
5. Connect trailer wiring and check directional/brake lights
6. Confirm the mast cradle locking pin is in place and doors are latched
7. Remove bulbs from light fixtures if driving over rough ground
8. Check trailer tire inflation
9. Torque wheel lugs in three passes if a tire was removed: 20-25, then 50-60, then 90-120 ft-lbs