Wildcat Roughneck 40KW Diesel Generator
Made In the USA! Each Wildcat generator is hand-built in Wichita Kansas
40KW of Over-Engineered Power.
With rugged power and versatility, our Wildcat Roughneck 40KW Diesel Generator is ready to produce the energy you require, exactly when you need it. Choose from a variety of optional equipment to customize your generator to fit your specific needs. Our standard options include Tier 3 Diesel KOEL industrial engines or EPA certified NG/LPG Arrow industrial engines, paired with Stamford alternators and DeepSea controllers, in power capacities of 30KW, 40KW, 60KW, and 100KW.
Designed for extended use, our powerful Roughneck Generator offers reliable, convenient power in a durable, open-frame design.
Offered in four Prime Power variations, from 30 KW to a powerful 100 KW, the Roughneck Generator is built to withstand tough conditions and can be trusted to run for long periods without supervision. This makes it perfect for use in big operations such as military bases, government buildings, oil and gas facilities, and disaster relief situations.
-
Durable industrial engine
-
Exceeds NFPA-110, Level 2 Requirements
-
Prime power rated for 24/7/365 run times
-
Easy-to-use digital controls
-
Commercial-grade alternator and controller
-
Easy to service
Included Items:
- 40KW Roughneck Diesel Generator
- FREE SHIPPING!!!
Roughneck 40kW Generator Optional Features (Sold Separately)
- UL 142A - 140 Gal Diesel Fuel Tank for 24 hours of Run Time.
- (CHOOSE TANK OPTION ON THIS PAGE)
- FREE 3-way valve option for external tank available upon request!
- Cat 5 Hurricane-Rated Steel Enclosure
- Military Grade Wiring

The Roughneck generator was designed with rugged simplicity in mind. Three-phase, open skid, or enclosed packages are designed for emergency applications but built to run for extended power outage periods on prime-rated liquid-cooled engine platforms.
Durable Industrial Engine
•Planned for emergency applications but built for industrial applications, the Roughneck’s power plant is a premier industrial fixed-speed (1,800 RPM) engine built to provide strong, reliable power without sacrificing engine longevity.
Quality Clean Power
•Voltage regulation ensures that electronics are safely powered with less 5% total harmonic distortion (THD) at no load.
NFPA-110
•Wildcat designed the Roughneck to exceed NFPA-110, Level 2 Emergency Power Supply Systems (EPSS) by providing prime power (PP) to meet EPSS Class 168 Type 10.
Digital Controls
•Designed for single genset applications, the Roughneck’s digital controls monitor the genset’s voltage, current, power, frequency, engine speed, oil pressure and coolant temperature on a back -lit LCD display for ease of use.
Industrial Class Alternator
•Protected with Class H insulation and standard 40^C nominal rating, the Roughneck’s standard 12-wire winding and 2/3 pitch meets all key international standards and regulations including UL 1446.
Easy to Service
•Preventative maintenance and in-field repairs are made easier with our simplified engineering and non-proprietary parts.
See the Wildcat Roughneck Generator at work in the video below.
The Wildcat RO0040D3 35/40kW Roughneck Tier 3 Diesel Generator is a reliable and highly efficient power solution specifically designed to meet the demands of tough environments and rigorous applications. Notable features include the following:
- Power Output: 35kW continuous with a 40kW peak capability.
- Engine: Features a durable Tier 3 diesel engine known for reliability and fuel efficiency.
- Fuel Options: Compatible with diesel, natural gas, and propane, offering flexibility in fuel choice.
- Cooling System: Equipped with a heavy-duty liquid cooling system to ensure optimal performance even in extreme conditions.
- Rugged Construction: Built to withstand harsh environments, making it ideal for industrial, maritime, and remote applications.
- This generator can be customized with various optional equipment to cater to specific needs, making it a versatile choice.
The Wildcat Roughneck 40KW Diesel Generator, the RO0040D3, was expertly designed for industries that require dependable power in extreme environments, such as the blistering temperatures of desert oil fields or the frigid conditions of Arctic exploration sites. With its Tier 3 diesel engine, this generator is a strong and reliable performer that can operate efficiently on varying fuel types, including diesel, natural gas, and propane. This versatility is especially beneficial for remote locations with limited fuel options or for operators seeking to reduce their carbon footprint.
Crafted for resilience, the Wildcat Roughneck 40KW Diesel Generator is made to withstand the rugged demands of challenging environments. With a liquid cooling system that guarantees peak performance even in high temperatures, this generator is a reliable choice for essential operations in industries such as mining, construction, and emergency response, where downtime is not an option.
The Wildcat RO0040D3 boasts a unique feature: customization. With the ability to add specific equipment, this generator is able to meet the diverse needs of various operations, such as providing extra power outlets for construction sites or equipping data centers with enhanced control systems. This high level of customization ensures that the generator can be optimized for maximum efficiency and performance, regardless of its application.
The Wildcat RO0040D3 is more than just a generator - it's a complete power solution. Its sturdy construction, adaptable fuel choices, and ability to be customized make it ideal for those who require dependable power in harsh conditions. It is an essential tool in industries like agriculture, where reliable electricity is crucial for irrigation and equipment use, and the telecommunications sector, where it can serve as the foundation for essential communication systems.
Experience the unparalleled capabilities of the Wildcat Roughneck 40KW Diesel Generator - a lifeline for uninterrupted operations. Its extraordinary power, durability, and versatility make it the ultimate choice for a wide range of applications. When faced with tough challenges, trust in the Wildcat Roughneck 40KW to keep going.
See the Roughneck Video With Wildcat Power Gen CEO Matt Roeser.
Product Specifications
Model
Model Number
RO0040D3AXEManufacturer
WildcatMade In USA
YesRated Watts
37kWRated Amps
154 AmpsVoltage
120/240 VoltsEnclosure
Open Skid Design—Optional Hurricane Rated Steel Enclosure Sold SeparatelyDecibel Rating
72 dBA No LoadType
Prime PowerSeries Name
RoughneckFeatures
Starting System
Electric StartLow Oil Alert
Low Oil ShutdownMainline Breaker
175 AmpsBattery Requirement
12-Volt 900 CCAMounting Pad
Prepared Site RequiredWeight
3207 PoundsDimensions
108.78L x 41.78W x 71.34H InchesWarranty Information
Consumer Warranty
Wildcat 3-Year 5000-Hour Limited WarrantyCommercial Warranty
Wildcat 3-Year 5000-Hour Limited WarrantyEngine
Engine Brand
KOELEngine Size
3.2 Liter Inline 4 CylinderEngine RPM
1800Cast Iron Sleeve
Cast Iron EngineCooling System
Liquid CooledAlternator
Alternator Type
Brushless 12-LeadFrequency
60 HertzAuto Voltage Regulation
YesFuel
Fuel Type
Ultra Low Sulphur DieselFuel Tank Material
Optional Steel Fuel TankFuel Tank Size
140 Gallon Optional TankRun Time (50% Load)
73 Hours
View Full Specifications for the Roughneck Diesel 40KW
Shipping | This item ships to |
![]() |
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
![]() |
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
![]() |
We offer the absolute lowest price we can offer |
|
![]() |
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
![]() |
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
Description
Wildcat Roughneck 40KW Diesel Generator
Made In the USA! Each Wildcat generator is hand-built in Wichita Kansas
40KW of Over-Engineered Power.
With rugged power and versatility, our Wildcat Roughneck 40KW Diesel Generator is ready to produce the energy you require, exactly when you need it. Choose from a variety of optional equipment to customize your generator to fit your specific needs. Our standard options include Tier 3 Diesel KOEL industrial engines or EPA certified NG/LPG Arrow industrial engines, paired with Stamford alternators and DeepSea controllers, in power capacities of 30KW, 40KW, 60KW, and 100KW.
Designed for extended use, our powerful Roughneck Generator offers reliable, convenient power in a durable, open-frame design.
Offered in four Prime Power variations, from 30 KW to a powerful 100 KW, the Roughneck Generator is built to withstand tough conditions and can be trusted to run for long periods without supervision. This makes it perfect for use in big operations such as military bases, government buildings, oil and gas facilities, and disaster relief situations.
-
Durable industrial engine
-
Exceeds NFPA-110, Level 2 Requirements
-
Prime power rated for 24/7/365 run times
-
Easy-to-use digital controls
-
Commercial-grade alternator and controller
-
Easy to service
Included Items:
- 40KW Roughneck Diesel Generator
- FREE SHIPPING!!!
Roughneck 40kW Generator Optional Features (Sold Separately)
- UL 142A - 140 Gal Diesel Fuel Tank for 24 hours of Run Time.
- (CHOOSE TANK OPTION ON THIS PAGE)
- FREE 3-way valve option for external tank available upon request!
- Cat 5 Hurricane-Rated Steel Enclosure
- Military Grade Wiring

The Roughneck generator was designed with rugged simplicity in mind. Three-phase, open skid, or enclosed packages are designed for emergency applications but built to run for extended power outage periods on prime-rated liquid-cooled engine platforms.
Durable Industrial Engine
•Planned for emergency applications but built for industrial applications, the Roughneck’s power plant is a premier industrial fixed-speed (1,800 RPM) engine built to provide strong, reliable power without sacrificing engine longevity.
Quality Clean Power
•Voltage regulation ensures that electronics are safely powered with less 5% total harmonic distortion (THD) at no load.
NFPA-110
•Wildcat designed the Roughneck to exceed NFPA-110, Level 2 Emergency Power Supply Systems (EPSS) by providing prime power (PP) to meet EPSS Class 168 Type 10.
Digital Controls
•Designed for single genset applications, the Roughneck’s digital controls monitor the genset’s voltage, current, power, frequency, engine speed, oil pressure and coolant temperature on a back -lit LCD display for ease of use.
Industrial Class Alternator
•Protected with Class H insulation and standard 40^C nominal rating, the Roughneck’s standard 12-wire winding and 2/3 pitch meets all key international standards and regulations including UL 1446.
Easy to Service
•Preventative maintenance and in-field repairs are made easier with our simplified engineering and non-proprietary parts.
See the Wildcat Roughneck Generator at work in the video below.
The Wildcat RO0040D3 35/40kW Roughneck Tier 3 Diesel Generator is a reliable and highly efficient power solution specifically designed to meet the demands of tough environments and rigorous applications. Notable features include the following:
- Power Output: 35kW continuous with a 40kW peak capability.
- Engine: Features a durable Tier 3 diesel engine known for reliability and fuel efficiency.
- Fuel Options: Compatible with diesel, natural gas, and propane, offering flexibility in fuel choice.
- Cooling System: Equipped with a heavy-duty liquid cooling system to ensure optimal performance even in extreme conditions.
- Rugged Construction: Built to withstand harsh environments, making it ideal for industrial, maritime, and remote applications.
- This generator can be customized with various optional equipment to cater to specific needs, making it a versatile choice.
The Wildcat Roughneck 40KW Diesel Generator, the RO0040D3, was expertly designed for industries that require dependable power in extreme environments, such as the blistering temperatures of desert oil fields or the frigid conditions of Arctic exploration sites. With its Tier 3 diesel engine, this generator is a strong and reliable performer that can operate efficiently on varying fuel types, including diesel, natural gas, and propane. This versatility is especially beneficial for remote locations with limited fuel options or for operators seeking to reduce their carbon footprint.
Crafted for resilience, the Wildcat Roughneck 40KW Diesel Generator is made to withstand the rugged demands of challenging environments. With a liquid cooling system that guarantees peak performance even in high temperatures, this generator is a reliable choice for essential operations in industries such as mining, construction, and emergency response, where downtime is not an option.
The Wildcat RO0040D3 boasts a unique feature: customization. With the ability to add specific equipment, this generator is able to meet the diverse needs of various operations, such as providing extra power outlets for construction sites or equipping data centers with enhanced control systems. This high level of customization ensures that the generator can be optimized for maximum efficiency and performance, regardless of its application.
The Wildcat RO0040D3 is more than just a generator - it's a complete power solution. Its sturdy construction, adaptable fuel choices, and ability to be customized make it ideal for those who require dependable power in harsh conditions. It is an essential tool in industries like agriculture, where reliable electricity is crucial for irrigation and equipment use, and the telecommunications sector, where it can serve as the foundation for essential communication systems.
Experience the unparalleled capabilities of the Wildcat Roughneck 40KW Diesel Generator - a lifeline for uninterrupted operations. Its extraordinary power, durability, and versatility make it the ultimate choice for a wide range of applications. When faced with tough challenges, trust in the Wildcat Roughneck 40KW to keep going.
See the Roughneck Video With Wildcat Power Gen CEO Matt Roeser.
Product Specifications
Model
Model Number
RO0040D3AXEManufacturer
WildcatMade In USA
YesRated Watts
37kWRated Amps
154 AmpsVoltage
120/240 VoltsEnclosure
Open Skid Design—Optional Hurricane Rated Steel Enclosure Sold SeparatelyDecibel Rating
72 dBA No LoadType
Prime PowerSeries Name
RoughneckFeatures
Starting System
Electric StartLow Oil Alert
Low Oil ShutdownMainline Breaker
175 AmpsBattery Requirement
12-Volt 900 CCAMounting Pad
Prepared Site RequiredWeight
3207 PoundsDimensions
108.78L x 41.78W x 71.34H InchesWarranty Information
Consumer Warranty
Wildcat 3-Year 5000-Hour Limited WarrantyCommercial Warranty
Wildcat 3-Year 5000-Hour Limited WarrantyEngine
Engine Brand
KOELEngine Size
3.2 Liter Inline 4 CylinderEngine RPM
1800Cast Iron Sleeve
Cast Iron EngineCooling System
Liquid CooledAlternator
Alternator Type
Brushless 12-LeadFrequency
60 HertzAuto Voltage Regulation
YesFuel
Fuel Type
Ultra Low Sulphur DieselFuel Tank Material
Optional Steel Fuel TankFuel Tank Size
140 Gallon Optional TankRun Time (50% Load)
73 Hours
View Full Specifications for the Roughneck Diesel 40KW
Shipping
Shipping | This item ships to |
Delivery
![]() |
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
Why Buy From Us
![]() |
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
![]() |
We offer the absolute lowest price we can offer |
|
![]() |
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
![]() |
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
Review

Zendure SuperBase V4600 + Soalr Panel(s) - choose from 1 to 4 Soalr Panels

Choose Voltage and Enclosure or No Enclosure (Skid Mount)

Select Number of Solar Panels