Engine Derating; Shutting Down The Unit; Lowering The Mast; Lowering The Mast-Manually - Generac Power Systems Magnum MLT4150MV Owner's Manual

Operation

Engine Derating

All units are subject to derating for altitude and
temperature. Derating reduces the available power for
operating tools and accessories connected to the outlets.
For every increase in 1000 ft (305 m) of elevation, engine
performance for this unit typically drops between 2% and
4%. Also, engine performance decreases about 1% for
every 10ºF (5.6ºC) increase in ambient air temperature
over 72ºF (22ºC).

Shutting Down the Unit

Check with personnel using power supplied by the unit
and let them know the power is going to be turned off.
Make sure the power shutdown will not create any
hazards by accidentally turning off equipment that needs
to remain running (pumps, compressors, lights, etc.).
1. Remove all loads from the outlets.
2. See Figure 3-10. Switch the individual circuit
breakers for each light OFF (O).
3. Switch the main circuit breaker OFF (O).
4. Move the control power switch to STOP.
NOTE: For extended storage time, disconnect the
battery. For extended storage requirements, refer to the
engine operator's manual.
I I I
O O O
Figure 3-10. Shutting down the Unit

Lowering the Mast

WARNING
Burn hazard. Lamps become extremely hot
while in use. Allow 10–15 minutes for cooling
before handling or lowering mast. Touching a
hot lens or fixture can cause severe burns.
1. Shut down the lights and engine. See
Down the Unit.
2. If the trailer is going to be moved, it is
recommended that the mast is turned so the lights
face toward the back of the unit. To rotate the mast:
a. Loosen the mast rotation knob.
b. Rotate the mast until the white arrows are
aligned and the metal stop tabs are touching.
18
OFF
GLOW
RUN
PLUG
START
I
O
004550
(000278)
Shutting
The winch and lights should be facing toward
the back of the unit.
c. Tighten the mast rotation knob.
3. Press and hold the winch control toggle switch
downward to collapse the mast to its lowest
position. Verify the electrical cord does not get
caught in, or pinched by, the mast while it is being
lowered.
WARNING
Personal Injury. Stop immediately if the mast hangs
up or the winch cable develops slack. Excess slack
could cause the mast to collapse, resulting in personal
injury or equipment damage.
IMPORTANT NOTE: Contact a Generac Mobile
Products Authorized Service Dealer immediately if
the mast hangs up or the winch cable develops
slack.
NOTE: If the generator is not operational, and the
batteries do not have enough power to lower the mast, it
may be necessary to lower the mast manually.
Lowering the Mast—Manually
WARNING
Burn hazard. Lamps become extremely hot
while in use. Allow 10–15 minutes for cooling
before handling or lowering mast. Touching a
hot lens or fixture can cause severe burns.
NOTE: Do not use this procedure unless it is absolutely
necessary. Continuous use of this procedure could
damage the planetary gear brake of the winch. This
procedure will not work if the planetary gear brake is
damaged.
D
C
Figure 3-11. Winch Assembly
1. See Figure 3-11. Remove the power cables from
the two terminals on the winch motor assembly (A).
Owner's Manual for MLT Light Tower
(000265)
(000278)
A
B
A
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