Pro Series GENSD7D 5500W-7000W Diesel Powered Generator Review

Pro-Series GENSD7 Diesel Generator

Pro-Series GENSD7D Diesel Generator

The Pro Series GENSD7D 7000 Peak watts/ 5500 Running watts Diesel generator is marketed by Buffalo Tools which also markets the Sportsman Brand of Portable generators. Note that the newest model is now running at 6300W continuous, this model is the GENSD7. This review is for the 5500W model.

Buffalo Tools is a wholesale importer of a wide range of quality products for both home as well as industrial use. They have been in the market since 1963 and are known for the affordability of their products. They are a wholesale company and do not directly deal with the consumer.

The Pro Series GENSD7D diesel generator is designed for heavy duty work and can be used as a backup source for power at home during power outages. It is an ideal generator to use at a job site or at a construction site to power tools and equipment. This is and EPA approved generator but not CARB compliant.

Power Output and Generation

The Pro Series GENSD7D diesel generator is capable of supplying 5500 watts of continuous power while being able to surge up to 7000 watts.

This generator is equipped with a 418 cc 9 hp OHV 4 stroke diesel engine which is designed for a long life and fuel economy.

Power output is self-excited, 2 pole single phase with a power factor of 1.0 and 60 hz produced as the engine runs at 3600 RPM.

Power usage is a little confusing based on the published data from Buffalo tools.

Electrical Output Conditions

The outlets provided are:

  • Two – 120V 5-20R outlets (duplex set)
  • One – 120V L5-30R outlet
  • One 120/240V L14-30 outlet
  • one 12VDC terminal

The literature from Pro Series is stating the new model version of continuous watts which may be confusing if you are looking at the older 5500W model. Make sure you check model numbers GENSD7D (5300W) and GENSD& (6300W)

AT 5500W the maximum amperage is 45A for 120V and 22.5A for 240V.

If looking at the newer model the maximum rated voltage at 120V is 52.5 A or 6300W. When switched to 240V Pro-Series indicates maximum amps is 26.25 A. Just make sure you are considering the watts available on this older model.

You are allowed to use all three 120V outlets in combination up to the rated amps per outlet but are really limited to continuous watt level for your model. It was noted that the 12 VDC can also be used simultaneously with the 120V system.

Fuel Type and Noise Levels:

The Pro-Series GENSD7D generator runs on diesel fuel. It has a fuel tank capacity of 4 gallons and a capability of running for up to 7 hours at full load on one tank of fuel. This makes this a very fuel efficient unit.


This unit produces a noise level of 70 db when it is running. For a diesel generator this is relatively quiet and compares to many of the gas powered generators in this size.

(Back to Top)

Dimensions and Weight

The overall dimensions of this generator are 36 x 26.5 x 20 inches ( L x H x W ) and it weighs in at 396 lbs. (closer to 420 to 425 with fuel.)

This is a not much bigger than comparable gas powered generators except in length making it slightly more bulky, but you have to remember that it was designed for heavy duty usage and the diesel configuration makes it a bit bigger and significantly heavier.

Typical Uses and Needs

The Pro-Series GENSD7D generator runs on diesel fuel which is much more stable than gasoline and is easily available. This generator is also equipped with 4 wheels that make it easy to move around.

Delivering 5500 watts of power continuously makes this an ideal generator to power your house in times of emergencies. It is also a generator that can be used at job sites or construction sites to power electrical equipment and power tools

Display & Control Panel, Start-up

Pro-Series GENSD7 Control Panel

The control panel of the Pro-Series GENSD7D generator is located on the side of the generator. When you face the control panel you will find that you have the Electric Start switch located to the extreme left at the top of the control panel.

Next to this at the right you have the Low Oil alert light and next to it you have the Voltmeter. To the right of the voltmeter you have a 120V/240V toggle switch and to the right of this switch you have the main circuit breaker.

Below the Start switch you have two 120 Volt outlets and next to them on the right you have two reset buttons. To the right of the reset buttons you have the 120Volt L5-30R twist lock outlet and to the right of this outlet you have the 120/240 Volt L14-30R twist lock outlet. To the right of this out let you have the ground terminal and next to this you have the 12Volt DC terminals.

Start up
The Pro-Series GENSD7D diesel generator has an electric start system to start the engine of the generator. Before starting the generator check to see that you have the proper level of engine oil also check and see that you have enough fuel in the fuel tank. Check to see that the generator is properly grounded and is on a flat level surface.

Here are the steps to be taken to start this generator.

  1. Check to see that there are no loads connected to the generator.
  2. Move the 120V/240V toggle switch to the correct setting.
  3. Move the Main circuit breaker to the OFF position.
  4. Set the Engine Run switch to the RUN position.
  5. Turn the Fuel valve to the ON position.
  6. Insert the key in the Electric Start switch and turn it to the Start position.
  7. Allow the engine to run for a few minutes before connecting any electrical loads.
  8. Move the Circuit breaker to the ON position.
  9. Connect any electrical devices to the generator.

Shut Down

  1. Turn OFF all connected devices and unplug them.
  2. Switch the circuit breaker to the OFF position.
  3. Allow the generator to run for a few minutes without any load.
  4. Turn the engine Run lever to the OFF position.
  5. Turn the Fuel valve to the OFF position.
  6. Turn the Starter switch to the OFF position.

(Back to Top)


Here are the features of the Pro-Series GENSD 7D diesel generator.

  1. It has a 418 cc 9 hp diesel engine which lets it deliver 5500 watts of continuous power and surge up to 7000 watts.
  2. It can run for 7 hours on 4 gallons of diesel at full load capacity.
  3. It has an electric start system.
  4. It is equipped with an automatic low oil shut off.
  5. It has an automatic voltage regulator.
  6. It is equipped with four installed wheels for easy maneuverability.
  7. It produces a noise level of only 70 db.

Care and Maintenance and Use

For safe economical and trouble free operation of the Pro-Series GENSD7D generator it is recommended that you do proper routine maintenance on the generator. This will also help to prolong the life of the generator and help reduce pollution. Here is the maintenance schedule as recommended by Buffalo Tools.

Each use

  1. Check engine oil level.
  2. Check the air filter.
  3. Check the fuel level.

First 20 hours

  1. Change the engine oil.

Every 3 months or 50 hours

  1. Clean the air filter.

Every 6 months or 100 hours

  1. Replace engine oil.

Every year or 300 hours

  1. Replace fuel filter.
  2. Replace oil filter.
  3. Clean the fuel tank.

(Back to Top)

Warranty and Repairs

Buffalo Tools indicates that this generator is covered by a 1 year limited warranty as stated on its brochure (6300W), also in the manuals it says that the emission related parts of the generator are covered by a 2 year warranty. A point of confusion is that in the owners manuals indicate the basic generator is covered by a 90 day limited warranty, which covers the defective parts and workmanship including the labor to replace them. We confirmed with Buffalo Tools that indeed it has a 1 year warranty.

Of course individual state laws may override the warranty applications and you should read the warranty thoroughly. The do require you to call or email customer service rather than use the retailer, so registration will need to be completed.

Consumer Comments

The Pro-Series GENSD7D diesel generator gets 3.1 stars out of 5 on Amazon. The customers who bought this generator had differing views about it. Some of them were very happy with the generator and said that it performed to their satisfaction and was much cheaper to run than a gasoline powered generator.

Some of the customers who bought this generator said that they had problems with it within a few hours of running it. They also had differing views about the customer service. Some said that they got the replacement parts quickly while others said that it was difficult to get customer support to help them.

It was noted that if you’re mechanically inclined and willing to work on your own machine that there are a number of adjustments such as valve settings that one should do on a regular basis.

Also one factor that seems to be an issue is proper grounding, which can cause issues with generator brushes, voltage control units, this is a miss use of the unit and not covered under warranty. However, there are claims of proper grounding and bad parts from the initial use but having very bad service to try and help get resolution.

(Back to Top)

Pros & Cons


  • Diesel powered generator, the fuel is easier to store than gasoline.
  • Can run for 7 hours at full load capacity on only 4 gallons of diesel.
  • Has built in wheels for easy maneuverability.
  • It has an automatic voltage regulator.
  • It produces only 70 db of noise.


  • It is very heavy.
  • It appears that it is difficult to get customer support to help when needed.
  • Actually warranty is not very clear and conflicting..
  • It does not supply clean electricity to run electronic equipment.


This list price of this generator is $2500.00 but it is available at a price lower than this. It is available from serveral sources although the best pricing has been through amazon that has had some free shipping. Check the latest pricing here:Pro-Series GENSD7D 5500 Running Watt Diesel Generator


There are a few accessories that you might want with this generator. You can find transfer kits available that will help you transfer the power from the generator safely to your home.

Reliance Controls 31406CRK Pro/Tran 6-Circuit 30 Amp Generator Transfer Switch Kit With Transfer Switch, 10-Foot Power Cord, And Power Inlet Box For Up To 7,500-Watt Generators

Generac 6294 30-Amp 6-10 Circuit Manual Transfer Switch Kit for Portable Generators

You can also get different size power cords and a power inlet for your home.

Reliance Controls PB30 L14-30 30 Amp Generator Power Cord Inlet Box For Up To 7,500 Watt Generators

Reliance Controls PC3010 10-Feet 30-Amp L14-30 Generator Power Cord for up to 7500-Watt Generators

Coleman Cable 01915 3-Feet Generator Power Cord Adapter, 10/3 Splitter Y Adapter, L5-30P to (2) Lighted 5-20R

(Back to Top)


The Pro-Series GENSD7D diesel generator is a heavy duty generator made specially for running job sites and construction sites where there is a need for electricity to power tools and equipment. Its built in wheels make it easy to move it where you need it. With a continuous output of 5500 watts and a surge capacity of 7000 watts it can be used as a backup power source for your home in times of emergencies. It is fuel efficient and can run for 7 hours on only 4 gallons of fuel at full load capacity.

Similar Generation Units:

The following Generators are similar diesel portable generators.

All Power America APG3202 6,500 Watt 10 HP Silent Diesel Powered Generator with Electric Start & Wheel Kit

Kipor Power Systems KDE5000E Diesel Digital Generator

Pulsar PG7000DOF Diesel Generator with Open Frame, 7000-watt

Pulsar PG7000D Diesel Generator, 7000-watt

(Back to Top of Pro-Series GENSD7D Portable Generator Review)

Comments are closed.


Pin It on Pinterest