LIGHT TOWER
MLT6SM • MLT6SK • MLT8SK
OPERATING MANUAL
Parts manuals available online at www.generacmobile.com
00749
17973 G 07/15
CALIFORNIA PROPOSITION 65 WARNING: Diesel engine exhaust and some of its
constituents are known to the state of California to cause cancer, birth defects, and
CALIFORNIA PROPOSITION 65 WARNING: This product contains or emits chemicals
known to the state of California to cause cancer, birth defects, and other reproductive
ii
WARNING
other reproductive harm.
WARNING
harm.
Introduction
This manual provides information and procedures to safely operate and maintain the Generac Mobile Products unit.
For your own safety and protection from physical injury , carefully read, understand, and observe the safety instructions
described in this manual. Keep a copy of this manual with the unit at all times. Additional copies are available from
Generac Mobile Products, or can be found at www.generacmobile.com.The information contained in this manual
was based on machines in production at the time of publication. Generac Mobile Products reserves the right to
change any portion of this information without notice.
Read all of the manuals included with the unit. Each manual details specific information regarding items such as
setup, use and service requirements. An engine operator’s manual provides detailed operation and maintenance
procedures for the engine. Additional copies of the engine operator’s manual are available from the engine
manufacturer.
DO NOT MODIFY or use this equipment for any application other than for which it was designed.
Generac Mobile Products recommends that a trained and licensed professional perform all electrical wiring and
testing functions. Any wiring should be in compliance with the National Electrical Code (NEC), state and local
regulations and Occupational Safety and Health Administration (OSHA) guidelines.
GENERAC MOBILE PRODUCTS LLC
215 Power Drive • Berlin, WI 54923
U.S.A.
Phone: 920-361-4442
FAX: 920-361-4416
Toll Free: 1-800-926-9768
www.generacmobile.com
For technical or parts QUESTIONS, please contact the Generac Mobile Products Customer Support
or Technical Support team at 1-800-926-9768. Please have your serial number available.
To ORDER SERVICE PARTS, please contact the dealer from which you purchased the unit, or call
Generac Mobile Products to locate a dealer in your area.
Engine Make:__________________________________________
Engine Serial Number:___________________________________
Engine Model Number: __________________________________
Generator Make: _______________________________________
Generator Model Number:________________________________
Generator Serial Number: ________________________________
Unit Model Number:_____________________________________
Unit Serial Number: _____________________________________
iii
This Page Intentionally Left Blank
iv
Table of Contents
Introduction............................................................................................................................ iii
Section 1 - Safety
Safety Notes....................................................................................................................................... 1
Operating Safety.................................................................................................................................1
Engine Safety.....................................................................................................................................2
Service Safety ....................................................................................................................................3
Towing Safety.....................................................................................................................................3
Reporting Trailer Safety Defects ........................................................................................................3
Safety Symbol Summary.................................................................................................................... 5
Section 2 - General Information
Specifications .....................................................................................................................................7
Unit Dimensions ....................................................................................................................9
Unit Serial Number Locations...........................................................................................................10
Component Locations.......................................................................................................................11
Control Panel....................................................................................................................................13
Prestart Checklist .............................................................................................................................15
Section 3 - Operation
Light Tower Set Up...........................................................................................................................17
Raising the Mast...............................................................................................................................18
Raising the Mast with Electric Winch Option....................................................................................19
Starting the Unit................................................................................................................................20
Light Operation................................................................................................................................. 20
Derating for Altitude..........................................................................................................................21
Wet Stacking ....................................................................................................................................21
Control Panel Receptacles............................................................................................................... 22
Shutting Down the Unit.....................................................................................................................22
Automatic Shutdown.........................................................................................................................22
Lowering the Mast - Manual.............................................................................................................23
Lowering the Mast - Electric Winch Option.......................................................................................23
Electronically Lowering the Mast.........................................................................................23
Manually Lowering the Mast................................................................................................23
Towing the Unit.................................................................................................................................24
Lifting and Tie Down.........................................................................................................................25
Section 4 - Maintenance
Daily Walk Around Inspection...........................................................................................................27
General Maintenance.......................................................................................................................27
Basic Maintenance Schedule - Mitsubishi Engine............................................................................28
Basic Maintenance Schedule - Kubota Engine ................................................................................29
Winch Use, Operation and Maintenance - Manual...........................................................................29
Prior to Use..........................................................................................................................29
Operation.............................................................................................................................29
Maintenance........................................................................................................................30
Winch Use, Operation and Maintenance - Electric...........................................................................30
Winch Preventive Maintenance Schedule...........................................................................30
Winch Mechanical Brake.....................................................................................................30
Jack Maintenance.............................................................................................................................31
Trailer Wheel Bearings..................................................................................................................... 31
Section 5 - Troubleshooting
Troubleshooting the Lights...............................................................................................................33
Mast Lights Off, Checking Outside the Control Box ............................................................33
Mast Lights Off, Checking Inside the Control Box...............................................................33
Mast Lights On But the Light Output is Low ........................................................................ 33
v
Section 6 - Wiring Diagrams
Mast Light Connections.................................................................................................................... 35
AC Wiring - MLT6SM, MLT6SK........................................................................................................36
AC Wiring - MLT8SK........................................................................................................................37
DC Wiring - Mitsubishi......................................................................................................................38
DC Wiring - Kubota...........................................................................................................................39
DC Wiring - Electric Winch...............................................................................................................40
DC Wiring Option - Heated Fuel Filter - Mitsubishi...........................................................................41
DC Wiring Option - Heated Fuel Filter - Kubota............................................................................... 42
Trailer Lights Wiring..........................................................................................................................43
Section 7 - Options & Accessories
Lower Radiator Hose Heater Option - Use and Maintenance..........................................................45
Service Log ............................................................................................................................ 47
vi
SAFETY NOTES
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury or death.
This manual contains DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES which must be
followed to prevent the possibility of improper service, damage to the equipment, personal injury or death.
The following formatting options will apply when calling the readers attention to the DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES.
INDICA TES A HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, WILL RESULT IN
Indicates a hazardous situation which, if not avoided, could result in death or serious
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury .
Section 1 - Safety
DANGER
DEATH OR SERIOUS INJURY.
WARNING
injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could result in property or equipment
damage.
Note: Notes contain additional information important to a procedure and will be found within the regular text body
of this manual.
OPERATING SAFETY
Before using the unit, be sure to read and understand all of the instructions. This equipment was
designed for specific applications; DO NOT modify or use this equipment for any application other than
which it was designed for. Equipment operated improperly or by untrained personnel can be dangerous.
Read the operating instructions and familiarize yourself with the location and proper use of all instruments
and controls. Inexperienced operators should receive instruction from someone familiar with the equipment
before being allowed to operate or set up the unit. The following points should be practiced at all times:
• The area immediately surrounding the unit should be dry, clean, and free of debris.
• Position and operate the unit on a firm, level surface.
• NEVER start a unit in need of repair.
• If the unit is equipped with a frame grounding stud, follow any local, state, and National Electrical
Code (NEC) guidelines when connecting.
• NEVER operate the unit on a combustible surface.
• NEVER operate a unit while tired, distracted, or under the influence of drugs or alcohol.
• Keep all body parts, clothing and other loose items away from moving parts.
• ALWAYS lower the mast when not in use, or if high winds or electrical storms are expected in the area.
• The mast extends up to 23 ft (7m). ALWAYS make sure the area above the unit is open and clear of
overhead wires and obstructions.
• Keep area around the unit clear of people while raising and lowering the mast.
17973 G MLT6SM/K-8SK Operating Manual 1
Safety
• Bulbs become extremely hot during use. Allow bulb and light fixture to cool 10-15 minutes before
handling.
• NEVER raise, lower or turn the mast while the unit is operating.
• ALWAYS extend the outriggers and level the unit before raising the mast. DO NOT retract the outriggers
while the mast is up.
• If for any reason any part of the mast hangs up or winch cable develops slack while raising or lowering
the mast, STOP immediately and contact an authorized service representative.
• NEVER use the unit if insulation on electrical cord is cut or worn through.
• NEVER operate the lights without protective lens cover in place or with a lens cover that is cracked
or damaged.
• Only use mild soap and water to clean the lens covers. Other chemicals may have an adverse effect
on the glass.
• DO NOT fill fuel tank near an open flame, while smoking, or while engine is running. DO NOT fill tank
in an enclosed area with poor ventilation.
• DO NOT operate with the fuel tank cap loose or missing.
• Shut the engine down if any of the following conditions exist during operation:
1. Noticeable change in engine speed.
2. Loss of electrical output.
3. Equipment connected to the unit overheats.
4. Sparking occurs.
5. Engine misfires or there is excessive engine/generator vibration.
6. Protective covers are loose or missing.
7. If the ambient air temperature is above 120°F (49°C).
ENGINE SAFETY
Internal combustion engines present special hazards during operation and fueling. Failure to follow the
safety guidelines described below could result in severe injury or death. Read and follow all safety warnings
described in the engine operator's manual. A copy of this manual was supplied with the unit when it was
shipped from the factory.
• DO NOT run engine indoors or in an area with poor ventilation unless exhaust hoses are used. Engine
exhaust contains carbon monoxide, a deadly , odorless and colorless gas which, if inhaled, can cause
nausea, fainting or death. Make sure engine exhaust cannot seep into closed rooms or ventilation
equipment.
• DO NOT touch or lean against hot exhaust pipes or engine components.
• DO NOT clean air filter with gasoline or other types of low flash point solvents.
• DO NOT operate the unit without a functional exhaust system.
• Prolonged exposure to sound levels in excess of 85 dB(A) can cause permanent hearing loss. Wear
hearing protection when working around a running engine.
• Batteries contain sulfuric acid which can cause severe injury or death. Sulfuric acid can cause eye
damage, burn flesh or eat holes in clothing. Protective eye wear and clothing are necessary when
working on or around the battery. Always disconnect the negative (-) battery cable from the
corresponding terminal before performing any service on the engine or other components.
• NEVER open the radiator cap or oil drain plug while the engine is running or before the engine has
cooled down. Pressurized coolant and hot engine oil can cause severe burns. Allow the unit to cool
completely before attempting any service work.
• Keep area around exhaust pipes and air ducts free of debris to reduce the chance of an accidental fire.
2 MLT6SM/K-8SK Operating Manual 17973 G
SERVICE SAFETY
All service work must be performed by qualified personnel who are familiar with the equipment. Only a
qualified electrician should troubleshoot or repair electrical problems occurring in this equipment. Follow the safety guidelines described below to prevent hazardous situations which could result in severe
injury or death.
• NEVER wash the unit with high pressure hoses, power washers, or steam cleaners. Water may collect
in the unit, causing damage to electrical parts.
• ALWAYS use extreme caution when servicing this unit in damp conditions. Do not service the unit if
your skin or clothing is wet. Do not allow water to collect around the base of the unit.
• Replace all missing and hard to read decals. Decals provide important operating instructions and
warn of dangers and hazards.
• Before servicing the unit, make sure the Key switch and circuit breakers are in the OFF (O) position,
and the negative (-) terminal on the battery is disconnected. NEVER perform even routine service
(oil/filter changes, cleaning, etc.) unless all electrical components are shut down.
• NEVER start the unit under load. The circuit breakers must be in the OFF (O) position when starting
the unit.
• Wear heavy leather gloves when handling winch cables. Never let cables slip through bare hands.
Safety
TOWING SAFETY
T owing a trailer requires care. Both the trailer and vehicle must be in good condition and securely fastened
to each other to reduce the possibility of an accident. Some states require that large trailers be registered
and licensed. Contact your local Department of Transportation of fice to check on license requirements for
your particular unit.
• Check that the hitch and coupling on the towing vehicle are rated equal to, or greater than, the trailer's
Gross Vehicle Weight Rating (GVWR).
• Check tires on trailer for tread wear, inflation, and condition.
• NEVER tow trailer using defective parts. Inspect the hitch and coupling for wear or damage.
• Make sure the trailer hitch and the coupling are compatible. Make sure the coupling is securely fastened
to the vehicle.
• Make sure directional and brake lights on the trailer are connected and working properly.
• Check that the lug nuts holding the wheels are tight and that none are missing.
• Maximum recommended speed for highway towing is 45 mph (72 km/h). Recommended off-road
towing speed is not to exceed 10 mph (16 km/h) or less, depending on terrain.
• When towing, maintain extra space between vehicles and avoid soft shoulders, curbs and sudden
lane changes. If you have not pulled a trailer before, practice turning, stopping and backing up in an
area away from heavy traffic.
• A film of grease on the coupler will extend coupler life and eliminate squeaking. Wipe the coupler
clean and apply fresh grease each time the trailer is towed.
• Connect safety chains in a crossing pattern under the tongue.
• Before towing the trailer, check that the weight of the trailer is equal across all tires. On trailers with
adjustable height hitches, adjust the angle of the trailer tongue to keep the trailer as level as possible.
REPORTING TRAILER SAFETY DEFECTS
If you believe your trailer has a defect which could cause a crash or could cause injury or death, you should immediately
inform the National Highway Traf fic Safety Administration (NHTSA) in addition to notifying Generac Mobile Products
17973 G MLT6SM/K-8SK Operating Manual 3
Safety
LLC.
If NHTSA receives similar complaints, it may open an investigation; and if it finds that a safety defect exists in a group
of vehicles, it may order a recall and remedy campaign. However, NHTSA cannot become involved in an individual
problem between you, your dealer, or Generac Mobile Products LLC.
To contact NHTSA, you may either call the Auto Safety Hotline toll-free at 1-888-327-4236 (TTY:1-800-424-9153),
go to http://www.safercar.gov; or write to:
Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590
You can also obtain other information about motor vehicle safety from http://www.safercar.gov.
4 MLT6SM/K-8SK Operating Manual 17973 G
Safety
SAFETY SYMBOL SUMMARY
This equipment has been supplied with numerous safety and operating decals. These decals provide important
operating instructions and warn of dangers and hazards. Replace any missing or hard-to-read decals and use care
when washing or cleaning the unit. Decal placement and part numbers can be found in the online parts manual at
www.generacmobile.com. Below is a summary of the intended meanings for the symbols used on the decals.
> 60 mph
Safety alert symbol;
used to alert you
to potential hazards.
Hot surface(s) nearby.
Belt/entanglement
hazard; keep body parts
clear of this area.
Fan hazard; keep body
parts clear of this area.
Crush hazard; keep
body parts clear of
this area.
Wind hazard; do not set
up in wind speeds
greater than 60 mph
(95 km/h).
Do not operate unit
indoors or in an area
with poor ventilation.
Align marks for stowed
position.
Check diesel fuel fill
D
level.
Check engine oil fill
level.
Check coolant fill level.
Read and understand
the operator’s manual
before operating.
STOP
Circuit breaker.
Mast lights.
Glow plugs.
Stop engine.
Run engine.
Engine start.
Electrical storm hazard.
Asphyxiation hazard;
operate in well ventilated area.
Dangerous voltage may
be present.
Burn/scald hazard;
pressurized steam.
Ultraviolet radiation
hazard; operate only
with lens intact.
15 MIN
Allow lamp to cool.
Wait 15 minutes.
Do not step on this
surface.
Do not operate near
powerlines. Contact with
powerlines can cause
electrocution.
Do not remove guard.
Fire/explosion hazard;
keep open flames
away from unit.
Disconnect battery
before servicing.
Unit electrical ground.
Anchor/tie down point.
Forklift here only.
Lift here only.
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17973 G MLT6SM/K-8SK Operating Manual 5
Safety
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6 MLT6SM/K-8SK Operating Manual 17973 G
Section 2 - General Information
SPECIFICATIONS
GENERAC MODEL MLT6SM MLT6SK
Engine
Make/Brand.............................................................................Mitsubishi ................................Kubota
Model......................................................................................L3E-W461ML ..........................D1005-E3BG1-MGM-1
EP A Tier ..................................................................................4f ................................... ..........4f
Horsepower - Prime hp (kW) .................................................10.5 (7.8).................................11.7 (8.7)
Horsepower - Standby hp (kW) .............................................12.2 (9.1).................................13.1 (9.8)
Operating Speed rpm.............................................................1800........................................1800
Displacement in
Cylinders - qty.........................................................................3..............................................3
Fuel Consumption - 100% Prime gph (Lph) .........................0.47 (1.78)...............................0.50 (1.89)
Battery Type - Group Number.................................................24 ............................................24
Battery Voltage (quantity per unit)...........................................12V (1) ....................................12V (1)
Battery Rating.........................................................................440 CCA..................................440 CCA
Generator
Make/Brand.............................................................................Marathon Electric ....................Marathon Electric
Model......................................................................................201CSA5411...........................201CSA5411
Type, Insulation.......................................................................Brushless, F ............................Brushless, F
Generator Set (Engine/Generator)
Output - Standby kW (kVA) ....................................................6.0 (6.0)...................................6.0 (6.0)
Output Voltage V.....................................................................120/240, single phase.............120/240, single phase
Output Amperes 120V (240V) A .............................................50 (25).....................................50 (25)
Frequency Hz..........................................................................60 ............................................60
Power Factor...........................................................................1 (1Ø)......................................1 (1Ø)
3
(L) ..............................................................57.97 (0.95).............................61.08 (1.00)
Weights
Dry Weight lbs (kg).................................................................1290 (585)...............................1330 (603)
Operating Weight lbs (kg) ......................................................1560 (708) ..............................1600 (726)
Capacities
Fuel Tank Volume gal (L)........................................................43.5 (165)................................43.5 (165)
Usable Fuel Volume gal (L)....................................................43.5 (165)................................43.5 (165)
Coolant (incl. engine) qt (L)....................................................4.5 (4.3)...................................4.8 (4.5)
Oil (incl. filter) qt (L)................................................................5.0 (4.7)...................................5.4 (5.1)
Maximum Run Time hrs .........................................................90 ............................................84
Lighting
Lighting Type...........................................................................Metal Halide ........................... .Metal Halide
Ballast Type.............................................................................Coil & Core..............................Coil & Core
Lumens...................................................................................440,000 ...................................440,000
Coverage acres (m
AC Distribution
Circuit Breaker Size ................................................................30 ............................................30
Voltage Regulation..................................................................Capacitor +/- 6% .....................Capacitor +/- 6%
Voltages Available 1Ø.............................................................120, 240 ..................................120, 240
Trailer
Number of Axles......................................................................1 ..............................................1
Capacity - Axle Rating lbs (kg)...............................................2200 (998)...............................2200 (998)
Tire Size in..............................................................................13 ............................................13
Hitch - Standard......................................................................2'' ball ......................................2'' ball
Maximum Tire Pressure psi....................................................50 ...........................................50
2
)..............................................................5-7 (20,234-28,328) ................5-7 (20,234-28,328)
Specifications are subject to change without notice.
17973 G MLT6SM/K-8SK Operating Manual 7
General Information
GENERAC MODEL MLT8SK
Engine
Make/Brand...........................................................................................................................Kubota
Model.................................................................................................................................... D1105-E3BG
EP A Tier ....................................................................................................................... .........4f
Horsepower - Prime hp (kW) ...............................................................................................13.5 (10.1)
Horsepower - Standby hp (kW) ........................................................................................... 15.4 (11.5)
Operating Speed rpm...........................................................................................................1800
Displacement in
Cylinders - qty.......................................................................................................................3
Fuel Consumption - 100% Prime gph (Lph) .......................................................................0.70 (2.65)
Battery Type - Group Number............................................................................................... 24
Battery Voltage (quantity per unit).........................................................................................12V (1)
Battery Rating....................................................................................................................... 440 CCA
Generator
Make/Brand...........................................................................................................................Marathon Electric
Model.................................................................................................................................... 201CSA5412
Type, Insulation..................................................................................................................... Brushless, F
Generator Set (Engine/Generator)
Output - Standby kW (kVA) ..................................................................................................8.0 (8.0)
Output Voltage V................................................................................................................... 120/240, single phase
Output Amperes 120V (240V) A ...........................................................................................66 (33)
Frequency Hz........................................................................................................................ 60
Power Factor.........................................................................................................................1 (1Ø)
3
(L) ............................................................................................................68.53 (1.12)
Weights
Dry Weight lbs (kg)...............................................................................................................1349 (612)
Operating Weight lbs (kg) .................................................................................................... 1619 (734)
Capacities
Fuel Tank Volume gal (L)......................................................................................................43.5 (165)
Usable Fuel Volume gal (L)..................................................................................................43.5 (165)
Coolant (incl. engine) qt (L)..................................................................................................4.8 (4.5)
Oil (incl. filter) qt (L)..............................................................................................................5.4 (5.1)
Maximum Run Time hrs ....................................................................................................... 60
Lighting
Lighting Type.........................................................................................................................Metal Halide
Ballast Type...........................................................................................................................Coil & Core
Lumens................................................................................................................................. 440,000
2
Coverage acres (m
)............................................................................................................5-7 (20,234-28,328)
AC Distribution
Circuit Breaker Size .............................................................................................................. 40
Voltage Regulation................................................................................................................Capacitor +/- 6%
Voltages A vailable 1Ø ........................................................................................................... 120, 240
Trailer
Number of Axles....................................................................................................................1
Capacity - Axle Rating lbs (kg)............................................................................................. 2200 (998)
Tire Size in............................................................................................................................ 13
Hitch - Standard....................................................................................................................2'' ball
Maximum Tire Pressure psi..................................................................................................50
Specifications are subject to change without notice.
8 MLT6SM/K-8SK Operating Manual 17973 G
Unit Dimensions
General Information
B
A
C
D
Figure 1 - Unit Dimensions
ABCDE
MLT6SM,
MLT6SK,
MLT8SK
Specifications are subject to change without notice.
17973 G MLT6SM/K-8SK Operating Manual 9
118 in. (3 m) 101 in. (2.6m) 23 ft (7 m) 57 in. (1.45 m) 120.5 in. (3.1 m)
E
00751
General Information
UNIT SERIAL NUMBER LOCATIONS
Refer to the illustration to locate the unit ID tag and Vehicle Identification Number (VIN) tag on the unit. Important
information, such as the unit serial number, model number , VIN and tire loading information are found on these tags.
Record the information from these tags so it is available if the tags are lost or damaged. When ordering parts or
requesting assistance, you may be asked to provide this information.
Unit ID Tag
(Located on top of control box)
VIN Tag
MANUFACTURED BY/FABRIQUE PAR: Generac Mobile Products LLC
GVWR/PNBV: 000KG (0000LBS)
GAWR / PNBE TIRE / PNEU RIM / JANTE GONFA FROID - KPA(PSI/LPC) SGL / DUAL
EACH
AXLE
THIS VEHICLE CONFORMS TO ALL APPLICABLE STANDARDS PRESCRIBED UNDER THE U.S. FEDERAL MOTOR VEHICLE SAFETY STANDARDS(FMVSS) AND CANADIAN
MOTOR VEHICLE SAFETY REGULATIONS IN EFFECT ONTHE DATE OF MANUFACTURE.
CE VEHICULE EST CONFORME A TOUTES LES NORMES QUI LUI SONT APPLICABLES EN VERTU DU REGLEMENT SUR LA SECURITE DES VEHICULES AUTOMOBILES DU CANADA EN VIGUEUR A LA DATE SA
FABRICATION.
00000000000000000
V.I.N./N.I.V.:
COLD INF. PRESS./
PRESS.DE
MODEL:
TYPE: TRAILER
DATE: 00/0000
XXX000
TIRE AND LOADING INFORMATION
RENSEIGNEMENTS SUR LES
PNEUS ET LE CHARGEMENT
The weight of cargo should never exceed 0000KG (0000LBS)
Le poids du chargement ne doit jamais depasser 0000KG (0000LBS)
SEE OWNER’S
MANUAL FOR
ADDITIONAL
INFORMATION
VOIR LE
MANUEL DE
L’USAGER
POUR
PLUS DE
RENSEIGNEMENTS
Manufactured by Generac Mobile Products LLC
(920) 361-4442 (800) 926-9768
Country of Origin
Manufacturing Code
1 ph. 1.0PF 3 ph. .8PF 3 ph. 1.0PF
KW
KVA
V
A
Serial Number
Model
Weight (lbs/kg) RPM/Frequency
Rating
FOR ELECTRICAL EQUIPMENT
ONLY. POUR MATERIAL
ELECTRIQUE SEULEMENT.
209649
Form: SFC626B
Ins. Class
Figure 2 - Serial Number Locations
01741
10 MLT6SM/K-8SK Operating Manual 17973 G
COMPONENT LOCATIONS
8
General Information
7
1
2
6
5
3
Figure 3 - Component Locations - Front and Left Side
1. Outriggers 5. Tongue Jack
2. Rear Jack 6. Mast Rotation Knob
3. Fuel Fill 7. Winch
4. Tie Down Locations 8. Lights
17973 G MLT6SM/K-8SK Operating Manual 11
4
01742
General Information
7
1
6
5
4
3
Figure 4 - Component Locations - Rear and Right Side
1. Central lift point 5. Control box
2. Radiator access 6. Rear jack
3. Forklift pockets 7. Engine access
4.
Tie down location
2
01743
12 MLT6SM/K-8SK Operating Manual 17973 G
CONTROL PANEL
I
O
I
O
I
O
I
O
I
O
General Information
12
DC CIRCUIT
BREAKER
12V
AC CIRCUIT
BREAKER
120V
3
9
STOP
8
15 SEC.
MAX.
MAIN
BREAKER
240V
4
3
7
5
6
Figure 5 - Control Panel Component Locations - MLT6SM, MLT6SK
1. DC Breaker 6. 240V Twist-Lock Receptacle
2. AC Breaker 7. Engine Hour Meter
3. Light Switches 8. Main Circuit Breaker
4. Electric Winch Switch (Optional) 9. Control Power Switch
5.
120V GFCI Receptacle
17973 G MLT6SM/K-8SK Operating Manual 13
00757
General Information
I
O
I
O
I
O
I
O
I
O
I
O
12
10
DC CIRCUIT
BREAKER
12V
AC CIRCUIT
BREAKERS
120V
3
9
STOP
8
15 SEC.
MAX.
MAIN
BREAKER
240V
4
3
7
5
6
Figure 6 - Control Panel Component Locations - MLT8SK
1. DC Breaker 6. 240V Twist-Lock Receptacle
2. AC Breakers 7. Engine Hour Meter
3.
Light Switches
4. Electric Winch Switch (Optional) 9. Control Power Switch
5.
120V GFCI Receptacle
14 MLT6SM/K-8SK Operating Manual 17973 G
00758
8. Main Circuit Breaker (For Lights and
GFCI Receptacles)
10. Main Circuit Breaker (for Twist-Lock
Receptacle)
PRESTART CHECKLIST
Before starting the unit, all items in the prestart checklist must be completed.
Read and understand ALL safety sections at the beginning of this manual.
Ensure all maintenance procedures are up to date. For more information, refer to “General
Maintenance” on page 27 and Basic Maintenance Schedules beginning on page 28.
The unit must be level with jacks firmly in contact with the ground and wheels lifted approximately 1
inch (2.5 cm) off the ground.
The unit must be dry. Check for any water inside, on, or near the unit; dry if needed.
For grounding requirements, follow any local, state or National Electrical Code (NEC) guidelines.
Switch the Control Power switch to the OFF (O) position.
Switch all circuit breakers to the OFF (O) position.
Inspect all electrical cords; repair or replace any that are cut, worn, or bare.
Ensure all winch cables are in good condition and centered on each pulley. Do not use if cables are
kinked or beginning to unravel.
Check oil, coolant, and fuel levels. For more information, refer to “Basic Maintenance Schedule -
Mitsubishi Engine” on page 28.
Ensure battery connections are secure.
Check the engine fan belt tension and condition.
Check the engine fan belt guard.
Check the engine exhaust system for loose or rusted components.
Ensure the enclosure is secure.
General Information
17973 G MLT6SM/K-8SK Operating Manual 15
General Information
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16 MLT6SM/K-8SK Operating Manual 17973 G
Section 3 - Operation
LIGHT TOWER SET UP
1. For maximum light coverage, locate the unit at ground level or in a spot higher than the area being illuminated
by the lamps.
WARNING
The mast extends up to 23 ft (7 m). Make sure the area above the unit is open and
clear of overhead wires and obstructions. Do not set up the unit if high winds or
storms capable of producing lightning are expected in the area.
DETAIL B
C
D
E
DETAIL C
E
A
1”
F
Figure 7 - Set Up of Outriggers and Jacks
2. Place the unit on firm ground that is relatively flat, then block the wheels to keep it from moving (A). This will
make it easier to level the unit.
3. Pull the locking pin on the tongue jack and rotate the jack 90°. Replace the locking pin (B). Turn the jack
handle clockwise to raise the trailer tongue off of the towing vehicle.
B
DETAIL E
00843
4. A grounding stud is located on the rear frame of the trailer near the left side outrigger (B). For grounding
requirements, follow and local, state or National Electrical Code (NEC) guidelines.
5. Pull the locking pin (D) on the outrigger (E) and pull each outrigger out until the spring loaded locking pin
snaps back into place. Pull the locking pin on the outrigger jack and rotate each jack 180° so the jack pad is
facing down. Replace the locking pin.
17973 G MLT6SM/K-8SK Operating Manual 17
Operation
6. Turn the jack handles clockwise to start leveling the trailer (E). Adjust all three jacks by turning their handles
clockwise until they are firmly in contact with the ground and continue until the wheels are approximately 1
inch (2.5 cm) off the ground (F).
7. Before raising the mast, it may be necessary to adjust the lamps. The lamps may be adjusted up, down, left
or right by loosening the wing nuts on the trunnion (H) and aiming them in the desired direction. Tighten the
hardware completely and make sure the lamps are connected to the junction box (J).
RAISING THE MAST
1. Set up and level the unit. Refer to “Light T ower Set
Up” on page 17.
WARNING
The unit must be leveled with
the outriggers extended before
raising the mast. The
outriggers must remain
extended while the mast is up.
Failure to level the unit or
extend the outriggers will
severely reduce the stability
and could allow the unit to tip
and fall.
STOP
2. Check the mast cables for excessive wear or
damage. Make sure the cables are properly centered in each pulley (A). Check the electrical
cord for damage.
WARNING
Do not start the unit if
insulation on the electrical
cord is cut or worn through.
Bare wires in contact with the
mast or frame may energize the
unit and cause electrocution.
Repair or replace a damaged
cord.
3. Use the winch to extend the mast slowly , making
sure that the coiled electrical cord is extending at
the top sections of the mast. If, for any reason,
the winch cable begins to develop slack or any
of the mast sections get stuck, STOP IMMEDI-
ATELY and contact an authorized service center.
A
DETAIL B
B
C
00755
Do not extend the mast beyond the colored mark on the lower mast section (B). A limit
switch on the main mast section will disconnect power to the upper electric winch to prevent
18 MLT6SM/K-8SK Operating Manual 17973 G
Figure 8 - Pulley Locations - Manual Winch
CAUTION
overextending the mast.
Operation
4. Rotate the mast by loosening the mast rotation knob at the bottom of the mast (C). Turn the mast until the
lights face in the desired direction and then tighten the mast rotation knob to secure the mast in position.
WARNING
Never raise or lower the mast while the unit is operating.
RAISING THE MAST WITH ELECTRIC WINCH OPTION
1. Set up and level the unit. Refer to “Light T ower Set
Up” on page 17.
WARNING
The unit must be leveled with
the outriggers extended before
raising the mast. The
outriggers must remain
extended while the mast is up.
Failure to level the unit or
extend the outriggers will
severely reduce the stability
and could allow the unit to tip
and fall.
DETAIL B
2. Check the mast cables for excessive wear or
damage. Make sure the cables are properly centered in each pulley (A). Check the electrical
cord for damage.
WARNING
Do not start the unit if
insulation on the electrical
cord is cut or worn through.
Bare wires in contact with the
mast or frame may energize the
unit and cause electrocution.
Repair or replace a damaged
cord.
3. Press and hold the winch control switch (B)
upward to telescope the mast to the desired
height. Extend the mast slowly , making sure that
the coiled electrical cord is extending at the top
sections of the mast. If, for any reason, the
winch cable begins to develop slack or any of
the mast sections get stuck, STOP IMMEDI-
ATELY and contact an authorized service center.
A
C
D
STOP
DETAIL C
B
00756
Do not extend the mast beyond the colored mark on the lower mast section (C). A limit
switch on the main mast section will disconnect power to the upper electric winch to prevent
17973 G MLT6SM/K-8SK Operating Manual 19
Figure 9 - Switch & Pulley Locations - Electric Winch
CAUTION
overextending the mast.
Operation
I
O
I
O
I
O
I
O
I
O
I
O
A
4. Rotate the mast by loosening the mast rotation knob at the bottom of the mast (D). Turn the mast until the
lights face in the desired direction and then tighten the mast rotation knob to secure the mast in position.
WARNING
Never raise or lower the mast while the unit is operating.
STARTING THE UNIT
Note: If the engine was run out of fuel or the fuel tank was drained, it may be necessary
to bleed the fuel lines. Refer to the engine operator’s manual supplied with the unit.
5. Check that the main circuit breaker(s) are in the OFF (O) position.
MAIN
BREAKER
6. Turn the key on the Control Power switch to the right Glow Plug ( ) position and hold the key in place for five seconds, then turn the key to the right
Start ( ) position and hold it until the engine cranks and starts running.
Release the key, it will move to the Run ( ) position.
240V
Figure 10 - Direction of
Switches
00759
Note: For cold weather conditions, refer to the engine operator’s manual for appropriate glow plug interval.
CTIVATE GLOW PLUGS
15 SEC.
MAX.
STOP
CRANK ENGINE TO START
15 SEC.
MAX.
STOP
RELEASE KEY
15 SEC.
MAX.
STOP
00760
Figure 11 - Key Locations to Starting the Unit
Do not crank the engine longer than 10 seconds at a time. If the engine will not start, wait
30 seconds to allow the starter motor to cool and then repeat the starting procedure.
Excessive cranking will cause damage to the starter.
Note: If oil pressure is not obtained within 15 seconds after the key is switched to the Run ( ) position, the low oil
automatic shutdown will turn off the fuel supply , stopping the engine. Check the oil level and turn the key to the Stop
STOP
( ) position to reset the oil pressure timer before attempting to restart the engine.
7. Once the engine is running, allow it to reach normal operating temperature before switching on any loads.
LIGHT OPERATION
20 MLT6SM/K-8SK Operating Manual 17973 G
NEVER operate the lights without the protective lens cover, or with a lens cover that
is cracked or damaged. The bulbs in the light fixtures produce high temperatures and
operate under pressure. A broken or missing lens cover could cause the bulbs to
WARNING
shatter, causing injury.
Operation
A
I
O
I
OIO
I
O
I
O
I
O
1. Once the engine is up to temperature and running
smoothly, switch the main circuit breaker (A) to
the ON (I) position.
2. With the main circuit breaker on, switch each
individual circuit breaker for the lights (B) to the
ON (I) position, one at a time.
3. The ballast indicator lights (C) will come on and
continue to get brighter as the lights warm up,
and then remain on. This confirms that power is
coming from the ballasts to the lights.
4. If an indicator light does not come on, the ballast
may need to be serviced. If the indicator light
comes on and stays lit, but the related light is not
illuminated, check the bulb or the mast wiring.
Refer to “Troubleshooting the Lights” on
page 33.
Figure 12 - Light Switches and Breakers
5. The lights require a warm up period of 5-15 minutes before they reach full output. If the lights are shut down,
they require a cool down period of approximately 10 minutes before they can be switched on again.
DC CIRCUIT
BREAKER
12V
15 SEC.
MAX.
STOP
MAIN
BREAKER
240V
AC CIRCUIT
BREAKERS
120V
B
00761
6. The light tower uses four 1000W bulbs. When checking or replacing the bulbs, wipe them with a clean cloth
to avoid leaving any grease, oil residue or fingerprints on the glass. Any residue can create a hot spot on
the bulb, causing premature bulb failure.
CAUTION
Bulbs become extremely hot when in use. Allow bulb fixture to cool 10-15 minutes before
handling or lowering the mast.
DERATING FOR ALTITUDE
All units are subject to derating for altitude and temperature; this will reduce the available power for operating tools
and accessories connected to the receptacles. Typical reductions in performance are 2-4% for every 1000 ft (305
m) of elevation and 1% per 10ºF (5.6ºC) increase in ambient air temperature over 72ºF (22ºC).
WET STACKING
The unit is powered by a diesel engine. Diesel engines are susceptible to wet stacking if lightly loaded. Wet stacking
occurs when an engine is run at less than 30% of its full load capacity, causing unburned fuel to accumulate in the
exhaust system. Wet stacking can be detected by continuous black exhaust when the unit is under a constant load.
It can also cause fouling of injectors and buildup on engine valves. Diesel engines operate properly when applied
loads are between 30% and 100% capacity. Appropriate generator sizing is determined by the anticipated load. If
the unit is in a wet stack condition, load the unit heavily for five hours or until the exhaust is clear.
17973 G MLT6SM/K-8SK Operating Manual 21
Operation
I
O
I
O
I
O
I
O
I
O
I
O
CONTROL PANEL RECEPTACLES
The control panel is equipped with multiple receptacles
for running accessories or tools from the generator.
Power is supplied to the receptacles any time the engine
240V Twist-Lock
Receptacle
120V GFCI
Receptacles
is running and the main circuit breaker is switched to the
ON (I) position.
Note: Do not pull more than 1000W from each receptacle
when the lights are on. This will overload the generator
and cause the main circuit breaker to trip. Should the
breaker trip, switch off the lights, remove some of the load
to the receptacles and wait 10 minutes for the bulbs to
cool before turning them back on.
With all of the lights off, the full generator output may be
used with the 240V twist-lock receptacle.
00762
Figure 13 - Location of Receptacles
SHUTTING DOWN THE UNIT
Prior to 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 shut down will not create any hazards by accidentally turning off
equipment that needs to be kept on (pumps, compressors, lights, etc.).
When you have finished using the unit, proceed with shut down as follows:
1. Remove any loads from the receptacles.
2. Switch the individual circuit breakers for each light and each receptacle to the OFF (O) position.
3. Switch the main circuit breaker to the OFF (O) position.
4. Turn the Control Power switch to the OFF (O) position.
CIRCUIT BREAKERS
MAIN
BREAKER
240V
CONTROL POWER SWITCH
15 SEC.
MAX.
STOP
00763
Figure 14 - Breakers and Control Power Switch
Note: For extended storage time, disconnect the battery. For extended storage requirements, refer to the engine
operator’s manual.
AUTOMATIC SHUTDOWN
This unit is equipped with a low oil pressure and high coolant temperature automatic shutdown system. This system
will automatically shut off the fuel supply to stop the engine if oil pressure drops too low or the engine exceeds normal
operating temperature. Return the Control Power switch to the (stop) position to reset the unit after you have
determined the cause of the shutdown.
22 MLT6SM/K-8SK Operating Manual 17973 G
STOP
Operation
LOWERING THE MAST - MANUAL
1. Shut down the lights and engine, refer to “Shutting Down the Unit” on page 22. Allow the lights to cool 10-15
minutes before lowering the mast.
2. If the unit is going to be moved, it is recommended that the mast is turned so the lights face the rear 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.
c. Tighten the mast rotation knob.
3. Use the winch handles to collapse the mast to its lowest position. Ensure the electrical cord does not get
caught in, or pinched by, the mast while it is being lowered.
CAUTION
STOP IMMEDIATELY if the mast hangs up or the winch cable begins to develop slack.
Excess slack in the cable could cause the mast to collapse, which could result in personal
injury or equipment damage. Contact an authorized service center.
LOWERING THE MAST - ELECTRIC WINCH OPTION
Electronically Lowering the Mast
1. Shut down the lights and engine, refer to “Shutting Down the Unit” on page 22. Allow the lights to cool 10-15
minutes before lowering the mast.
2. If the unit is going to be moved, it is recommended that the mast is turned so the lights face the rear 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.
c. Tighten the mast rotation knob.
3. Press and hold the upper winch control switch downward to collapse the mast to its lowest position. Ensure
the electrical cord does not get caught in, or pinched by, the mast while it is being lowered.
Note: Some electric winch models are equipped with an anti-backlash safety limit switch. This switch will disconnect
power to the winch if excess cable slack is detected, preventing accidental lowering of the mast.
CAUTION
STOP IMMEDIATELY if the mast hangs up or the winch cable begins to develop slack.
Excess slack in the cable could cause the mast to collapse, which could result in personal
injury or equipment damage. Contact an authorized service center.
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.
Manually Lowering the Mast
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
17973 G MLT6SM/K-8SK Operating Manual 23
planetary gear brake is damaged.
Operation
1. Remove the power cables from the two terminals on the winch motor assembly (A).
2. Remove the two flange head screws (B) securing the winch motor assembly to the winch. Retain the screws
for reassembly.
3. Carefully remove the motor assembly (C), making sure the two pieces do not separate.
4. Insert a 3/8 in. hex key (D) into the sleeve bearing.
5. Rotate the wrench counter-clockwise to lower the mast. If any slack is observed in the cable, stop immediately and remove the slack.
6. When the mast is completely down, reinstall the winch motor assembly , securing it with the screws retained
in step 2.
TOWING THE UNIT
Once the engine is shut down, the mast and lights are properly stowed, and the unit is lowered so the weight is on
the wheels, follow these steps to prepare the unit.
1. Raise the outrigger jacks completely and remove the locking pins to rotate them up into the travel position.
Replace the locking pins.
2. Release the outrigger locking pins and slide the outriggers into the trailer frame until the locking pins snap
into place.
3. Use the tongue jack to raise or lower the trailer onto the hitch of the towing vehicle. Lock the hitch coupling
and attach the safety chains or cables to the vehicle. Remove the tongue jack locking pin and rotate the jack
into the travel position. Replace the locking pin.
Note: A film of grease on the coupler will extend coupler life and eliminate squeaking. Wipe the coupler clean and
apply fresh grease each time the unit is towed.
4. To ensure proper operation of the jacks, lube the grease fittings located on the leveling jacks. Refer to “Jack
Maintenance” on page 31. For maintenance interval information, refer to Basic Maintenance Schedules
beginning on page 28.
5. Connect any trailer wiring to the tow vehicle. Check for proper operation of the directional and brake lights.
6. Make sure the enclosure is properly latched.
7. If the unit is going to be driven over rough ground, remove the bulbs from the light fixtures.
8. Check for proper inflation of the trailer tires. For maximum tire pressures,
refer to Specifications beginning on page 7.
9. Check the wheel lugs. Tighten or replace any lugs that are loose or missing. If
a tire has been removed for axle service or replaced, tighten the lugs, in the
order shown, to the following specifications:
a. Start all lug nuts by hand.
3
1
5
6
2
4
b. First pass tighten to 20-25 ft-lbs (27-33 Nm).
c. Second pass tighten to 50-60 ft-lbs (67-81 Nm).
d. Third pass tighten to 90-120 ft-lbs (122-162 Nm).
Note: After the first road use, re-torque the lug nuts in sequence.
24 MLT6SM/K-8SK Operating Manual 17973 G
00205
Figure 15 - Lug Sequence
Operation
10. Maximum recommended speed for highway towing is 45 mph (72 km/h). Recommended off-road towing
speed is not to exceed 10 mph (16 km/h) or less, depending on the terrain.
LIFTING AND TIE DOWN
When lifting the unit, attach any slings, chains or hooks directly to the central lift point. The central lift point is located
on top of the enclosure.
Note: When using the central lift point, the mast must be in the stowed position, as shown.
1. Make sure the equipment being used to lift the unit has sufficient capacity . For approximate weights, refer to
Specifications beginning on page 7.
2. Always remain aware of people and objects around the unit while moving.
3. Use the forklift pockets with care. Lift only from rear of the unit
When securing the unit for transportation, use the tie down points, as shown.
Central
Lift Point
Forklift Pockets
Forklift From Rear Only
Tie Down Points
01074
Figure 16 - Lifting and Tie Down Points
17973 G MLT6SM/K-8SK Operating Manual 25
Operation
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26 MLT6SM/K-8SK Operating Manual 17973 G
Section 4 - Maintenance
Normal maintenance service and replacement of parts are the responsibility of the owner/operator and, as such, are
not considered defects in materials or workmanship within the terms of the warranty . It is strongly recommended that
the equipment be periodically checked by a Generac Mobile Products Authorized Dealer.
DAILY WALK AROUND INSPECTION
Look for conditions that could hinder performance or safety, such as (but not limited to) oil/coolant/fuel leakage,
blocked vents, loose/missing hardware, and electrical connections.
Visually inspect the fan belt for cracks, fraying, stretching, and verify the belt is properly seated in the pulley grooves.
Replace the belt according to the manufacturer’s recommendations.
Note: At the service interval stated in the Basic Maintenance Schedules starting on page 28, it is recommended that
the belt be removed and checked for wear. While the belt is removed, inspect pulleys and bearings. Rotate and feel
for hard turning or unusual sounds. If pulleys or bearings need replacement, contact the engine manufacturer.
Failure to perform a daily inspection may result in serious damage to the prime mover.
GENERAL MAINTENANCE
Poorly maintained equipment can become a safety hazard. In order for the equipment to operate safely and properly
over a long period of time, periodic maintenance and occasional repairs are necessary. NEVER perform routine
service (oil/filter changes, cleaning, etc.) unless all electrical components are shut off. 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.
• 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. W ater 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 that winch cables are in good condition and are centered on each pulley. DO NOT use a cable that
is kinked or starting to unravel.
• Check that the safety pins for the mast lock rod and mast lock bar are present and secured with a chain.
Check that the spring located in the mast lock bar is not broken or missing. Check the operation of the mast
lock bar.
• Check the wheel lugs. Refer to “Towing the Unit” on page 24.
• 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 COMPLETEL Y COOL, coolant may be added directly to the coolant
17973 G MLT6SM/K-8SK Operating Manual 27
Maintenance
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32 MLT6SM/K-8SK Operating Manual 17973 G
Section 5 - Troubleshooting
TROUBLESHOOTING THE LIGHTS
DANGER
THIS UNIT USES HIGH VOLTAGE CIRCUITS CAPABLE OF CAUSING SERIOUS
INJURY OR DEATH. ONLY A QUALIFIED ELECTRICIAN SHOULD TROUBLESHOOT
OR REPAIR ELECTRICAL PROBLEMS OCCURRING IN THIS EQUIPMENT.
Mast Lights Off, Checking Outside the Control Box
1. Mast light is too hot. Allow light to cool 10-15 minutes before restarting.
2. Faulty bulb connection. Check that the bulb is tight in the socket.
3. Bulb broken. Check for broken arc tube or outer bulb jacket, broken or loose components in bulb envelope
or blackening/deposits inside tube.
4. Check the connections inside the mast junction box and each mast light housing/socket.
5. Check the mast electrical cord for damage and check the cord connections inside the control box.
Mast Lights Off, Checking Inside the Control Box
1. Check the connections inside the control box and inside each ballast box.
2. Generator output incorrect. Check the incoming voltage to the ballast by checking the available voltage on
the GFCI receptacle. Incoming voltage should be 120V +/- 5V. If voltage is incorrect, the engine speed may
need to be adjusted or generator may require service.
3. Low transformer output. The voltage from the transformer should read approximately 400VAC as the light
“strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240-260VAC. On quick disconnect models, measure across the junction box terminals when the light is unplugged. On hard wired models,
remove the mast junction box cover and insert the wire probes into the connector blocks for the light and
ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs
to be replaced.
Mast Lights On But the Light Output is Low
1. Fixture and/or lens is dirty . Clean reflective surface inside fixture and both inside and outside surface of glass
lens. Use mild soap and water to clean lens. Other chemicals may have an adverse effect on the glass.
2. Bulb worn due to normal use. Replace bulb.
3. Check the mast coil cord, mast junction box and mast light connections.
4. Generator output incorrect. Check the incoming voltage to the ballast. Incoming voltage should be 120V +/5V. If the voltage is incorrect, the engine speed may need to be adjusted or the generator may require service.
5. Low transformer output. The voltage from the transformer should read approximately 400VAC as the light
“strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240-260VAC. On quick disconnect models, measure across the junction box terminals when the light is unplugged. On hard wired models,
remove the mast junction box cover and insert the wire probes into the connector blocks for the light and
ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs
to be replaced.
If problems persist, contact Generac Mobile Products Technical Service at 1-800-926-9768 for assistance.
17973 G MLT6SM/K-8SK Operating Manual 33
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