Tech & Specs

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Dependable Operation

The secret to our dependable operation is the unique, floating rotor which is pivoted in the spherical housing. This rotor provides the positive expulsion of fluid from the pumping chamber directly to the line of flow. The simplicity of this design with only one move part provides the most dependable pump manufactured today.

Unmatched Durability

Granco manufactures a full line of unique rotary positive displacement ball type pumps. In fact, it is the only ball type design being manufactured today. The simple ball and shaft design promotes durability because the pumping mechanism “floats” in the housing with no metal to metal contact. This design promotes years of durable, dependable service. The large rotating cavities provide slower speeds which maintains critical tolerances not seen in any other designs.


Adaptable Design

The unique design of the Granco pump provides a lower maintenance profile, easier installation, higher volumetric efficiencies, lower energy usage, reversibility, and easily adaptable to pump fluids from 32 ssu
(water) to over 1,000,000 ssu (cold grease). These pumps are either truck mounted or stationary and can be driven by electric motor drives, gas engine drive, hydraulic motor drive, or belt drive. The same basic pump can pump thin fluids to the most viscous fluids without changing its design.

Reversible Flow

The direction of flow in positive displacement pump designs depend on shaft rotation. Granco can provide flow in either clockwise or counter-clockwise direction by simply rotating the valve components 180 degrees. This simple adjustment will take only minutes and provides for the flow in either preferred direction. An arrow pointing to the inlet side is cast into our relief valve cover to confirm the correct inlet port.

Versatile Applications

All Granco pumps are available in (2) port or (4) port design. The (4) port design is used in many truck mounted applications where ease of connections is paramount on the chassis. All of our pumps are designed with mechanical seals or packing depending on the fluid being pumped and its temperature. All pumps are equipped with an internal relief valve for pressures up to 100psi or shipped without a relief valve for pressures over 100psi and up to 225psi. All pumps are capable of pumping very thin fluids or highly viscous fluids without making any changes to your existing pump.

Think Ni-Resist!

Granco offers an alternative to stainless steel pumps. Our Ni-Resist Pumps are 18-22% Nickel and 3.5% Chromium. This alloy gives the same corrosive resistance as stainless steel, but Ni-Resist does not gall, which is the main drawback of stainless steel. Stainless steel pump manufacturers must use expensive alloys and heat treatment processes in addition to much larger clearances to avoid galling. Granco’s Ni-Resist pumps are equal or superior to the 300 series of stainless steels. Its exceptional wear and galling resistance is due to the graphite particles distributed throughout its chemical structure as well as the finely dispersed Nickel and Chromium carbides. In addition to its tough corrosion resistance, Ni-Resist also offers erosion and heat resistance allowing high temperature pumping applications without structural or oxidation problems. This material is offered to customers for various applications in petroleum, marine, chemical processing, food handling, fertilizer and paper and pulp industries.

Materials of Construction

Granco Pumps can be used in many applications for many different fluids. The pump is classified as a slow speed, high displacement pump that receives its lubrication from the fluid being pumped. The fluid must have some “film forming” ability or lubricity between moving parts to minimize metal to metal contact between the rotor shafts and their bearings and between the pivoting parts of the rotor. There are (4) major material characteristics that must be considered in any given application. They are corrosion, abrasion, and temperature resistance as well as the self-lubricating qualities. When corrosion and abrasion are the major considerations, Granco offers a variety of material combinations to handle the fluid. Cast iron, bronze, Ni-Resist and ductile iron are used in various combinations of rotor material and main pump body components to handle your specific needs.

Temperature issues usually require Ni-Resist or cast iron and water based products need bronze. Granco can offer many solutions to problematic applications with the variety of materials available and in stock.”

Is Granco Right For You?

Usage Examples

Ready wherever you need them

Granco pumps deliver whether you need them mounted on a mobile system, stationary, or hydraulically controlled.

Granco has developed a new hydraulic motor mount for use on its entire line of pumps. The new flange mount provides direct drive mounting of the hydraulic motor permitting a more compact and rugged arrangement which eliminates a separate motor mount and the need to align the drive. On truck applications the power-take-off and universal joint drives are eliminated and replaced by the hydraulic lines from an engine driven hydraulic pump. For this reason, the Granco Truck-Mounted pumps can be located anywhere on the truck body and the controls placed where convenient. More than one pump can be easily installed, and with proper valving, the additional advantages of hydraulic drives can be used. Those advantages are infinite speed control, reversibility for two-way pumping, and pressure relief on the hydraulic side.

Granco mounted pumps are ideal for bulk transfer of petroleum products and a variety of other liquids in a myriad of other industries.
All units are securely mounted on a heavy steel base and easily adapted to any type of power source. The performance is smooth and quiet with no vibration when properly installed. All of Granco’s pump models have a rugged, cartridge-type outboard bearing and they are designed with two ports. Four port pumps are available upon request. Compare small space requirements and the efficient operation of our mounted units and you will find that Granco is your best buy in pumping equipment. All systems are engineered with the proper size motor and gear reducer directly driving the pump. The gear reducers used have totally enclosed reduction gears running in a smoothly in an oil-tight gear housing. The size of the motor will depend on the flow required, viscosity, temperature of the liquid, diameter and length of the discharge pipe along with the total dynamic head. All Granco pumps are available with gear motor drive, variable speed drive, torque limited drive and gasoline engine drive. Pictured is a typical system drawing produced for each individual system manufactured by Granco.
Hydraulically driven multiple pump systems are available for plant operations requiring the bulk transfer of fluid from tanks to blending stations, trucks, and railcars. When your plant operation needs three or more pumps to move liquids from several sources to different destinations, a hydraulically driven pumping system design by Granco is you ideal choice. The GRANCO HYDRIVE SYSTEM is the ultimate, modern answer to give you control of the flow rate and direction of flow for maximum flexibility in transferring fluids around your operation. Granco can assist you in plant layout, size and selection of pumps for each location. We then select a hydraulic power pack and central control panel to drive and control all the Granco pumps in your system. Each transfer pump is independently driven by a hydraulic motor under the HY-DRIVE control giving each pump complete zero to maximum speed flexibility and complete reversibility. The HY-DRIVE system allows easy the simple adjustment of pump speed and therefore flow rate. High flow rates are available for quick unloading of bulk carriers. Medium flow rates are used for loading delivery trucks or large containers such as totes. For barrel or pail filling operations, the low flow rates are matched to handling speeds. Speeds can be adjusted to pump viscous products effectively and to handle liquids in cold weather.

The HY-DRIVE pumping system features full reversibility of all Granco transfer pumps in your plant operation. A manual control for each transfer pump allows flow in either direction through the pump. By opening and closing valves, or switching hose connections in your system, the operator can have total control over the destination of the fluids in each individual tank. Savings are in initial costs since pre-engineered components allows us to custom design your drive system without the huge initial design cost. You save on operating labor cost since the centralized control of the entire system saves manpower and time. One man control is usually recommended. You save on operating costs since this system allows one or two pumps operating at once and the system adjusts itself to the conditions using only the energy called for by the system demand. In multiple pump systems quality concerns are solved by avoiding cross contamination in the final product by dedicating one pump for each individual tank. With only one large electrical motor and starter for the hydraulic power pack, the cost and complexity of make the system explosion proof if needed is dramatically reduced. Expansion for future growth is no problem since more pumps can be added to the entire system at minimal cost.

Granco Markets Served

(Stationary or Truck-mounted)


Low Viscosity Hydrocarbons
  • Diesel Fuels
  • Unleaded Gasoline
  • Jet Fuels (A/B)
  • Aviation Gasoline
  • Kerosene
  • Solvents
Medium Viscosity Oil Products
  • Lube Oils
  • Gear Oils
  • Multi-grade Lubricants
  • Auto Transmission Fluids
  • Waste Oil
  • Base Petroleum Products for Blending
  • Hydraulic Oils
High Viscosity Petroleum Products
  • Grease
  • Creosote
  • Bunker C
  • Coal Tar
  • Crude
  • Coal Tar
  • Asphalt
  • Asphalt Emulsions & Mixtures
  • Heat Transfer Fluids

Industrial Markets

Paint & Varnish
  • Highway Striping Epoxy Resins
  • Oil Base Paint
  • Water Base Paint
  • Resin Base Paint
  • Paint Recirculation
B. Glues, Adhesives & Chemicals
  • Resins
  • Polymers
  • Latex
  • Monomers
  • Epoxy Resins
  • Alkyd Resins
  • Plastisols
  • Slurries
  • Aldehydes
  • Ketons
  • Acetone
  • Acids
  • Alcohols
Water & water-Based Liquids
  • Water
  • Seawater
  • Bilge Water
  • Oil Skimmers

*Due to poor lubricity of water and water based liquids, their applications are not strong recommendations, as wear may be excessive. Increased clearances due to wear can cause poor performance.

However, some GRANCO applications have been successful.

Bronze pumps or bronze rotors are recommended for their self-lubricating tendencies and resistance to corrosion.

Soaps & Detergents
  • Concentrated Soap
  • Diluted Soap
  • Concentrated Detergents
  • Diluted Detergents

*Granco pumps have been used for both concentrated and diluted soaps and detergents, where excessive foaming and aeration must be avoided.

Process Applications( Ni-Resist Pumps)

Low Viscosity
  • Hot Oils
  • Cooking Oils(deep fat frying)
  • Acids
  • Caustics
  • Fertilizers
Medium Viscosity
  • Vegetable Oils
  • Soybean Oil
  • Corn Oil
  • Fish Oil
  • Cottonseed Oil
  • Coconut Oil
  • Hot Tallow
  • Animal Feed
High Viscosity
  • Molasses
  • Corn Syrup
  • Liquid Sugar
  • Fats & Tallows
  • Liquid Feed
  • Animal Feed
  • Crude Petroluem
  • Bunker C
  • Epoxy Resins

Process Applications (Ni-Resist Pumps)

A. Petroleum Applications (Sour Crude)
B. Marine (Seawater and Bilge)
C. Chemical Processing (Acids and Alkalines)
D. Food Handling (Vinegar, Liquid Sugar)
E. Fertilizer (Ammonium Sulphate)
F. Pulp & Paper(Suphates and Sulfides)

Want More Details?

Download the specs and dimensions chart to see all the various specs available. Don’t see what you need? Get in touch with us so we can make it for you!

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2203 Smeed Parkway, Caldwell, Idaho 83607


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