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Generac MLT4150MV Generator Set

The Generac MLT4150MV is a 15 kW Diesel standby generator set powered by a Mitsubishi S4L2 engine. It is available at 120/240 V and 240 V, single-phase, 60 Hz and rated 50 A. It holds about 6 L (1.6 gal) of oil and 4.3 L (1.1 gal) of coolant, with a maximum ambient rating of 49 °C. Starting uses 1 group-24 battery rated 440 CCA at 12 V. The set measures 2870×2710×7620 mm (113.0×106.7×300.0 in), weighs about 943 kg (2079 lb) and produces 71 dBA at 7 m. An integrated tank holds 213.5 L (56.4 gal), roughly 38 hours of runtime. The same S4L2 engine also powers generator sets from Mitsubishi and Pt. Berkat Manunggal Jaya.

15 kW
Standby
1.76 L
Displacement
6.0 L
Oil capacity
3
Document types

How to read your Generac serial & model number →

Typical fuel consumption for 15–20 kW Diesel generators →

Compare with other 15–20 kW Diesel generators →

Service parts for the MLT4150MV

Grouped by system, with how many of each the parts manual calls for.

Fuel system

1 required
300585Fuel filtersee priceAmazon

Oil system

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power15 kW
Prime power16.7 kW
EmissionsTier 4 Final
ControllerAnalog controls, Power Zone (if equipped), Power Zone Plus, Power Zone Plus (if equipped), Standard Analog
Oil capacity6.0 L
AlternatorMarathon 333CSA3024
Voltage options120/240 V, 240 V
Phase1
Rated current50 A
Power factor1 (1Ø)
Circuit breaker70 A
Battery group24
Battery cranking440 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity4.3 L
Max ambient49 °C
Dimensions (L×W×H)2870×2710×7620 mm
Dry weight943 kg
Wet weight1126 kg
Sound level71.0 dBA @ 7 m
Fuel tank213.5 L
Tank runtime38 hr

Engine

Mitsubishi S4L2
Oil capacity8.0 L
Coolant capacity11.0 L
Displacement1.76 L
AspirationNatural
Rated speed1 rpm

Filters for the Mitsubishi S4L2

2

Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.

SystemFilterDescriptionCross-references
Oil filterP502007Lube Filter, Spin-On Full FlowMITSUBISHI 30A4000100, MITSUBISHI 30A4000100A, NAPA 67356, BALDWIN B1402 FridayParts $13.99

Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:

SystemFilterDescriptionCross-references
Fuel filterP550345Fuel Filter, Spin-On SecondaryBALDWIN BF7915, ZETOR 0040563502, DEUTZ 01174696, DEUTZ 01180596 KuduParts $17.00 FridayParts $19.00

Same engine, other brands

2 brands

The Mitsubishi S4L2 in this set also powers 2 generator sets sold under 2 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

BrandModels
MitsubishiS4L2
Pt. Berkat Manunggal JayaBMGS.013LSP5

Maintenance & consumables

for the Mitsubishi S4L2
ItemSpecCapacityPart #Interval
Air filterDry cartridge—
Fuel filterFA-1D Lockable Flame Arrestor Fuel Cap300585 Amazon eBay
Oil filterChange the engine oil and oil filter after the initial 50 hours of operation, then at the appropriate interval thereafter.0A453102441000 hr Amazon eBay $24.99 NAPA $9.09
Battery—250 hr
BeltB—
Coolant—250 hr
Oil—1000 hr
Spark plug—1000 hr

Compatible filters for the Mitsubishi S4L2 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: Donaldson P772579 Donaldson P775300 Wix 46652 Baldwin PA1608 Wix 46672

Service intervals

22
ItemActionHoursMonthsNotes
Coolant levelCheck8 hrDaily or before use
Electrical connectionsCheck8 hrDaily or before use
Fuel levelCheck8 hrDaily or before use
Oil levelCheck8 hrDaily or before use
Tire pressureCheck8 hrDaily or before use
Engine bolts and nutsAdjust50 hrFirst service — Initial 50 hours
Engine oil and oil filterChange50 hrFirst service — Change after the initial 50 hours of operation, then at the appropriate regularly scheduled interval thereafter
Engine oil and oil filterReplace50 hrFirst service — Initial 50 hours, then yearly or 100 hours
Replace engine oil and oil filterChange50 hrFirst service — Mitsubishi engine, after initial 50 hours, then at regular interval thereafter
Air cleanerCheck250 hrInspect
Fuel filterReplace250 hr
Belt and belt tensionInspect400 hrInspect and adjust
Fuel tankDrain400 hrDrain water from fuel tank
Glow plugsCheck500 hrDiesel engines
Leveling jacksLubricate750 hr
Air cleaner elementReplace12 moReplace yearly, or after six cleanings, whichever occurs first (Mitsubishi engine guide)
Jack Maintenance (lubricate gearing/handle)Lubricate12 moPerform at least annually
Replace air cleaner elementReplace12 moKubota engine: yearly, or after six cleanings, whichever occurs first
Trailer Wheel Bearings LubricationLubricate12 moMinimum every 12 months or 12,000 miles (19,312 km)
Trailer wheel bearingsLubricate12 moMinimum recommended lubrication is every 12 months or 12,000 miles (19,312 km)
Wheel lug nutsCheckFirst service — Tighten to factory specifications after first 50 miles
Winch brake assemblyClean6 moClean and grease brake assembly per winch preventive maintenance schedule (semi-annually)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

14
TypeItemValueUnitCondition
PressureAir pressure for cabinet cleaning40PSI (276 kPa) max
PressureEngine oil pressure, normal operating35-80psi (241-552 kPa)engine running
TemperatureEngine coolant temperature, normal operating100-230°F (38-110°C)engine running
TemperatureHigh Coolant Temperature Shutdown Threshold210°F99°C
TorqueWheel lug nuts - first pass20-25ft-lb (27-33 Nm)star pattern
TorqueWheel lug nuts - second pass50-60ft-lb (67-81 Nm)star pattern
TorqueWheel lug nuts - third pass90-120ft-lb (122-162 Nm)star pattern
TorqueWheel lug nuts, first pass20-25ft-lb (27-33 Nm)first pass
TorqueWheel lug nuts, second pass50-60ft-lb (67-81 Nm)second pass
TorqueWheel lug nuts, third pass90-120ft-lb (122-162 Nm)third pass
VoltageEngine/DC battery voltage (VBAT)13.5-15V12-volt system, engine running
VoltageGFCI Outlet / Ballast Supply Voltage120 ±5V
VoltageTransformer Stabilized Voltage240-260VACafter strike, drops then rises and stabilizes
VoltageTransformer Strike Voltageapproximately 400VACwhen bulb strikes/induces an arc

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

FluidGradeStandardAmbientCapacityNotes
Coolant50% glycol, 50% waterbelow 49°CStandard mixture; 60/40 and heated options available for cold weather
Coolant50% glycol, 50% water or 60% glycol, 40% waterbelow 49°CLiquid cooled engines with standard 50/50 mixture or optional cold-weather 60/40 configuration
Coolant50/50 glycol/water or 60/40below 49°CLiquid cooled diesel engines
Coolant40% water / 60% antifreezeabove -36°CFreezing point -34°F (-36°C); maximum freeze protection is 60% antifreeze
Coolant50% water / 50% antifreezeabove -24°CFreezing point -12°F (-24°C); mix demineralized/distilled water with coolant, not hard water
Engine oilSAE 0W-20 Syntheticbelow -18°CFor use below -0°F / -18°C
Engine oilSAE 10WFrom engine oil viscosity chart decal
Engine oilSAE 15W-40From engine oil viscosity chart decal
Engine oilSAE 30WFrom engine oil viscosity chart decal
Engine oilSAE 40WFrom engine oil viscosity chart decal
FuelNo. 2D diesel (above freezing) / No. 1D diesel (at or below freezing); climatized 1D/2D mix also usable in some areasUltra-low-sulfur diesel onlyDo NOT use home heating oil or bio-diesel fuel
FuelUltra-low-sulfur diesel No. 1D or No. 2DNo. 1D when at or below freezing; No. 2D when above freezing; climatized fuel acceptable
FuelUltra-low-sulfur diesel; No. 1D below freezing, No. 2D above freezing (climatized 1D/2D blend acceptable in some areas)216.0 LDO NOT use home heating oil or bio-diesel fuel
GreaseHigh quality grease made specifically for wheel bearing lubricationTrailer wheel bearing lubrication, minimum every 12 months or 12,000 miles (19,312 km)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

12
Light Tower Setup installation

⚠ Verify area above unit is clear of overhead wires before raising the mast

  1. Position unit at ground level or higher than the area to be illuminated
  2. Place unit on firm, relatively flat ground (less than 5° slope) and block wheels
  3. Rotate the tongue jack 90° and raise the trailer tongue off the towing vehicle
  4. Use the grounding stud on the frame per NEC and local regulations
  5. Pull outrigger locking pins and extend outriggers until pins snap into place
  6. Rotate rear jack 90° and lower it, then level the trailer with all four jacks
  7. Adjust lamp aim by loosening trunnion wing nuts, then tighten hardware
Jack Maintenance maintenance
  1. Apply automotive grease to internal gearing via jack cover or grease fitting near crank (side-wind models)
  2. Rotate jack handle to distribute grease evenly
  3. Apply lightweight oil to handle unit at both sides of tube (side-wind models)
  4. Lubricate caster wheel axle bolt/nut assembly with lightweight oil if equipped
  5. Apply lightweight oil to screw stem (top-wind models)
RPM Quick Drain maintenance

Tools: RPM Quick Drain system hardware

  1. Convenient - no need to reach under machines
  2. Purges and extracts from the sump
  3. Evacuates sump directly to final containment via zero leak quick disconnect
  4. No spills, dripping filters, drain pans or intermediate containers needed
  5. Completes engine oil and filter change in less than 10 minutes
Trailer Wheel Bearing Lubrication maintenance

Tools: Grease gun

  1. Remove small rubber plug on grease cap
  2. Attach standard grease gun fitting to grease zerk fitting
  3. Pump grease until new grease is visible around gun nozzle
  4. Wipe excess grease from hub with clean cloth
  5. Replace rubber plug
Winch Preventive Maintenance maintenance

⚠ Replace cable immediately if damaged

⚠ Replace brake if slippage detected

  1. Check winch is free of dirt, oil, grease, water, and foreign substances
  2. Ensure all mounting bolts tightened to recommended torque values
  3. Check connections are securely tightened and free of corrosion
  4. Inspect cable for damage: cuts, knots, crushed or frayed portions, broken strands
  5. Check brake for slippage or drift by visual inspection when winch is under load
Lifting the Unit operation
  1. Verify lifting equipment has sufficient capacity for unit weight
  2. Close and lock all hoods and doors and stow the lights
  3. Verify the cradle locking pin is in place
  4. Attach slings, chains or hooks directly to the central lifting eye
  5. Use upper or lower forklift pockets with care, approaching perpendicular to the unit
Raising the Mast operation

⚠ Do not extend mast beyond the colored mark on the second mast section

  1. Set up and level the unit
  2. Check mast cables for wear or damage and verify centering in pulleys
  3. Press and hold the winch control toggle switch upward to extend mast to desired height
  4. Rotate the mast using the rotation knob at the base until lights face desired direction
Shutting Down the Unit operation
  1. Remove all loads from the outlets
  2. Switch individual light circuit breakers OFF
  3. Switch the main circuit breaker OFF
  4. Move the control power switch to STOP
Shutting Down the Unit - Standard Controls operation
  1. Remove all loads from the outlets
  2. Switch individual circuit breakers for each light OFF (O)
  3. Switch the main circuit breaker OFF (O)
  4. Move the control power switch to STOP
Starting the Engine - Analog Controls operation

⚠ Do not continuously crank engine for more than ten seconds

⚠ Never start the engine with circuit breakers switched on

  1. Verify main circuit breaker and individual light breakers are OFF (O)
  2. Turn key to GLOW PLUG position, hold 10-15 seconds until glow plug indicator turns red
  3. Turn key to START position, hold until engine cranks and starts
  4. Release key; it moves to RUN position
  5. Allow engine to reach normal operating temperature before switching on loads
Starting the Unit operation

⚠ Do not continuously crank engine for more than ten seconds

  1. Verify main circuit breaker and individual light breakers are OFF
  2. Turn key to GLOW PLUG position and hold five seconds or until indicator turns red
  3. Turn key to START position and hold until engine cranks and starts
  4. Release the key; it moves to RUN position
  5. Allow engine to reach normal operating temperature before switching on loads
Towing the Unit operation

⚠ Maximum recommended highway towing speed is 45 mph (72 km/h)

  1. Raise the rear jack and outrigger jacks fully into travel position
  2. Use the tongue jack to couple the trailer to the towing vehicle hitch and attach safety chains
  3. Lubricate the leveling jack grease fittings
  4. Connect trailer wiring and check directional/brake lights
  5. Verify mast cradle locking pin is secure and doors/enclosure are latched
  6. Check tire inflation and tighten wheel lugs in sequence per torque specification

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

How many kW is the Generac MLT4150MV?

The Generac MLT4150MV is rated 15 kW standby.

Which engine powers the Generac MLT4150MV?

The Generac MLT4150MV is powered by the Mitsubishi S4L2 engine.

What kind of fuel does the Generac MLT4150MV run on?

The Generac MLT4150MV runs on Diesel.

What is the oil capacity of the Generac MLT4150MV?

The Mitsubishi S4L2 engine in the Generac MLT4150MV has an oil capacity of 8.0 liters.

What is the cooling system capacity of the Generac MLT4150MV?

The Generac MLT4150MV cooling system holds 4.3 liters (1.1 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the continuous rating of the Generac MLT4150MV?

The Generac MLT4150MV is rated 16.7 kW prime, against 15 kW standby.

What is the sound level of the Generac MLT4150MV?

The Generac MLT4150MV is rated at 71.0 dBA at 7 m, per the manufacturer specification sheet.

What is the dry weight of the Generac MLT4150MV?

The Generac MLT4150MV has a dry weight of 943 kg (2078 lb).

What size fuel tank does the Generac MLT4150MV have?

The Generac MLT4150MV has a 213.5 liter (56 US gallon) fuel tank, giving about 38 hours of runtime.

What voltage does the Generac MLT4150MV produce?

The Generac MLT4150MV is offered in 120/240 V, 240 V, 1-phase.

What size battery does the Generac MLT4150MV need?

The Generac MLT4150MV uses 1 battery, 12 V each, 440 CCA, group 24, per the manufacturer specification sheet.

Which alternator is fitted to the Generac MLT4150MV?

The Generac MLT4150MV uses a Marathon 333CSA3024 alternator.

What oil filter fits the Generac MLT4150MV?

The Generac MLT4150MV uses oil filter part number 0A45310244.

What fuel filter fits the Generac MLT4150MV?

The Generac MLT4150MV uses fuel filter part number 300585.

Which air filter part number does the Generac MLT4150MV take?

The Generac MLT4150MV uses air filter part numbers Donaldson P772579, Donaldson P775300.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Low oil pressure shutdownLow oil levelVerify oil level on dipstick. Add oil, if needed.
Low oil pressure shutdownOil leaking from engineVisually inspect the engine for leaks.
Low oil pressure shutdownOil pressure switch failureRefer to OEM engine operator's manual to identify corrective action.
High coolant temperature shutdownLow coolant levelAdd coolant if needed. Allow engine to cool, then check coolant level in radiator. Restart engine and check coolant temperature. Stop engine immediately if coolant temperature is 210°F (99°C) or more.
High coolant temperature shutdownBlockage in radiatorInspect radiator shroud and ducting for blockage and remove any foreign matter.
High coolant temperature shutdownLeakage in coolant hoses, engine block, or water pumpInspect for visible leaks. Verify tension of water pump serpentine drive belt. Remove load on generator and restart engine. Verify coolant temperature and shut engine down immediately if it starts to overheat. Refer to the OEM engine operator's manual for additional information on engine overheating.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Generac MLT4150MV troubleshooting guide (28 entries) →

Parts

25
Part #DescriptionQtySystem
042418Dinse-Style Connector Kit Accepts #4 to #1/0 AWG cable. Kit includes one male Dinse-style plug which attaches to the work and/or weld cables and plugs into the Dinse-style receptacles on the power source.Cable connector Amazon eBay
043688RCCS-14 North/south fingertip control1Remote control Amazon eBay
043947FA-1D Lockable Flame Arrestor Fuel Cap Fuel cap can be padlocked to prevent vandalism. A built-in flame arrestor prevents flames or sparks from entering the fuel tank.1Fa 1d lockable flame arrestor fuel cap fuel cap can be padlocked to prevent vandalism a built in flame arrestor prevents flames or sparks from entering the fuel tank Amazon eBay
0439522/0 Stick Cable Set, 100/50 ft. (30.5/15 m) Consists of 100-foot (30.5 m) 2/0 electrode cable with holder, and 50-foot (15 m) work cable with clamp. 300 A, 100% duty cycle.1Stick cable set Amazon eBay
1738512/0 Stick Cable Set, 50 ft. (15 m) Consists of 50-foot (15 m) 2/0 electrode cable with holder, and 50-foot (15 m) work cable with clamp. 350 A, 100% duty cycle.1Stick cable set Amazon eBay
191981Tweco®-Style Connector Accepts #1/0 to #2/0 AWG cable. Kit includes one male Tweco-style plug which attaches to the work and/or weld cables and plugs into the Tweco-style receptacles on the power source.Cable connector Amazon eBay
195196No. 2 Stick Cable Set, 15 ft. (4.6 m) Consists of 15-foot (4.6 m) No. 2 electrode cable with holder, and 15-foot (4.6 m) work cable with clamp. 200 A, 100% duty cycle.Stick cable Amazon eBay
195511PRHC-14 Hand Control* Complete current control brings 120 volts of GFCI power to work area in a single cord. Housed in a durable and light aluminum case and includes 125-foot (38 m) cord with plugs.Remote control Amazon eBay
210061Tweco®/Dinse Adapter One-piece adapter with a male Tweco-style plug (to power source) on one end and a female Dinse-style receptacle (for weld cable connection) on other end.Cable connector Amazon eBay
252782Engine Filter Kit Includes all filters required for proper engine maintenance. Oil filter, primary and secondary fuel filter, and primary air filter.1Oil filter Amazon eBay $271.99
300585FA-1D Lockable Flame Arrestor Fuel Cap1Fuel filter Amazon eBay
300836No. 2 Stick Cable Set, 50 ft. (15 m) Consists of 50-foot (15 m) No. 2 electrode cable with holder, and 50-foot (15 m) work cable with clamp. 200 A, 100% duty cycle.Stick cable Amazon eBay
301580Wireless Remote Foot Control* For remote current control. Receiver plugs directly into the 14-pin receptacle of Miller machine. 90-foot (27.4 m) operating range. Wireless antenna kit 300749 is recommended.1Remote control Amazon eBay
301611Universal Connector Kits Tweco®-style receptacles 301595 Dinse-style receptacles Includes receptacles, wrench and electrical joint compound.Cable connector Amazon eBay
907529Spectrum® 375 X-TREME™ See literature PC/9.2Plasma cutter Amazon eBay
907579Spectrum® 625 X-TREME™ with 12-foot (3.7 m) torch See literature PC/9.6Plasma cutter Amazon eBay
907579001Spectrum® 625 X-TREME™ with 20-foot (6.1 m) torch See literature PC/9.6Plasma cutter Amazon eBay
042419SCREW RHM 10-32 X 44Service part / kit Amazon eBay
1191721-phase, 120/240 V, 50 A plug (NEMA 14-50P) to fit full KVA receptacle.1Service part / kit Amazon eBay
151086RCC-14 Remote Contactor and Current Control1Service part / kit Amazon eBay $51.68
194744RFCS-14 HD Foot Control* Heavy-duty foot current control. Includes 20-foot (6 m) cord and 14-pin plug.1Service part / kit Amazon eBay KuduParts $30.00
195301Blue water-resistant cover with Miller logo resists stains and mildew, and protects the finish of your welder.1Service part / kit Amazon eBay
209649Form: SFC626B1Service part / kit Amazon eBay
242211020RHC-14 Hand Control1Service part / kit Amazon eBay
301582Wireless Remote Hand Control - Wireless antenna kit 300749 recommended1Service part / kit Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Continuous1.140.301
Continuous100%2.230.59
Prime5.11.35
Prime100%2.230.59
Standby1.140.301
Standby100%2.230.59

Available documents

Spec sheet (Generac)Reference (Generac)Owner's manual (Generac)Owner's manual — A0000100009 (Generac)

This page was generated from the 4 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Full service, cheapest listings

Priced items from this model's own parts manual.

Oil filter 0A45310244$9.09
1 priced item$9.09