Roper Pump 1F-75 Type 27 Hydraulic Gear Pump

Roper Pump 1F-75 Type: 27 Hydraulic Gear Pump (Port Size: 6.3 cm / 2-1/2″) – New

The Roper Pump 1F-75 Type 27 is a positive-displacement rotary gear pump manufactured by Roper Pump Company for high-pressure fluid transfer, engine-room circulation, and mobile hydraulic applications. Built around the time-tested Roper “F” Series helical-gear design, the 1F-75 provides pulse-free displacement across a broad spectrum of viscous and lubricating fluids.

Operating at discharge pressures up to 300 PSI (20.7 bar) and delivering throughput capacities up to 90 GPM (20.5 m³/h) at maximum operational RPM, the unit delivers consistent volumetric efficiency. The Type 27 build indicates a foot-mounted assembly configured without an internal relief valve, designed to integrate into external piping loops with dedicated line-relief protection. Featuring a close-grained ASTM A48 Class 30 cast iron casing, heat-treated steel helical gear sets, durable bronze sleeve bushings, and an elastomeric mechanical face seal, the 1F-75 is built for high-duty-cycle industrial operations.

Model Details:

• Manufacturer: Roper Pump Company (USA)
• Model Designation: 1F-75 (F-Series, 75 frame size)
• Type: 27 (Foot mounted, high/low drive adaptable, plain backplate, mechanical seal, no internal relief valve)
• Manufacturer Part Number (MPN): 1F75-27 / 1F-75-TYPE-27
• Condition: New Unused Surplus
• Inlet / Outlet Port Dimensions: 6.3 cm (2-1/2″ / 2.5 inch nominal) Flanged Ports

Technical Details

Key Features

1. Precision-Cut Helical Pumping Gears: Precision hobbed helical steel gear teeth generate smooth, uniform fluid delivery without hydraulic chatter or high-frequency pulsation, minimizing strain on pipe fittings and inline valves.
2. Heavy-Duty Cast Iron Construction: The pump casing and end plates are cast from high-tensile ASTM A48 Class 30 gray iron, providing structural stability and pressure containment under cyclical 300 PSI shock loads.
3. High-Flow 6.3 cm (2-1/2″) Flanged Ports: Generous porting reduces fluid inlet velocity and net suction head losses, protecting against cavitation when pulling heavy marine distillates or high-viscosity hydraulic oils.
4. Positive Mechanical Shaft Face Seal: Eliminates the continuous maintenance and gland adjustments required by braided packing sleeves, preventing hydrocarbon leaks and environmental contamination during continuous duty.
5. High-Tolerance Bronze Sleeve Bearings: Internal bronze bushings are washed and lubricated by the pumped liquid, maximizing bearing surface contact and shaft stability during high-radial-load direct coupling or belt-drive configurations.

Applications

• Marine Engine Room Lube Oil Transfer: Circulation, crankcase replenishment, and batch oil purifiers for large 2-stroke and 4-stroke marine diesel propulsion units.
• Bunker & Heavy Marine Fuel (MGO/MDO) Transfer: Suction and transfer from double-bottom storage tanks to settling and day tanks.
• Industrial Hydraulic Power Units (HPU): Low-to-medium pressure bulk fluid circulation, charge pump feed, and reservoir filtration skid loops.
• Bulk Terminal & Tank Truck Offloading: Fuel oil, hydraulic oils, turbine fluids, transformer oils, and mineral lubricants.
• Auxiliary Machinery Lubrication Systems: Heavy reduction gearboxes, deck winches, thruster power packs, and offshore crane hydraulic drives.

Compatibility:

• Marine Diesel Main Engines & Gensets: Wärtsilä, MAN B&W, Caterpillar, MaK, Bergen, and Daihatsu auxiliary lube skid feeds.
• Centrifugal Oil Separator Systems: Feed pump loops on Alfa Laval, Westfalia (GEA), and Mitsubishi Purifier skids.
• Industrial Equipment: Direct replacement on mobile transfer skids, railcar loading arms, asphalt circulation systems, and continuous-duty hydraulic power plants.

Part Number Cross-References

• Roper Pump Co.: 1F-75 Type 27 / 1F75-27 / Spec 17
• Roper F Series Interchange: 1F-75 Type 21 (Packing Seal variant), 1F-75 Type 47 (Internal Relief Valve variant)
• OEM Stock Numbers: TN-11604, 1F7527

Frequently Asked Questions

What does “Type 27” signify on a Roper 1F-75 pump?

“Type 27” designates the pump’s engineering build specification: a foot-mounted cast iron housing with precision steel helical gears, bronze sleeve journal bushings, a mechanical shaft face seal, and a flat backplate without an internal built-in relief valve.

Can the Roper 1F-75 Type 27 run in reverse rotation?

Yes. The pump displacement mechanics operate equally well in both clockwise (CW) and counter-clockwise (CCW) directions. However, reversing shaft rotation reverses fluid flow direction (suction becomes discharge). If reversing rotation, verify the mechanical seal arrangement and external piping configurations match the new flow path.

What is the difference between the Roper 1F-75 and 1F-150?

The numbers denote the theoretical gear face width and displacement capacity. The 1F-75 features a 0.093 GPR displacement producing up to 90 GPM, while the larger 1F-150 has a 0.186 GPR displacement capable of delivering up to ~180 GPM.

Can this pump handle high-viscosity fluids?

Yes. The positive-displacement helical design makes the 1F-75 well-suited for transferring high-viscosity liquids such as lube oil, residual marine fuel, asphalt base, and polymer liquids. For viscosities exceeding 1,000 cSt, pump operational speed must be reduced to avoid cavitation and motor overload.

Does this pump require lubrication for its internal bearings?

No external grease lubrication is required for the gear journals. The internal bronze sleeve bushings are lubricated and cooled by the liquid passing through the pump housing. For this reason, the pump must never be operated dry.