6775-6771-6777

Summary

Product Identification

This document describes the 60 Frame Plunger Pump series, including models:

• 6775: Standard Brass
• 6771: Stainless Steel
• 6777: Nickel Aluminum Bronze

Features:

• Triplex plunger design delivers high efficiency and low pulsation.
• Durable dual V-Packings are lubricated and cooled by pumped liquid.
• Pre-set Lo-Pressure Seals provide secondary protection against external leaks and require no packing adjustment.
• Special high-density, polished, concentric plungers provide a true wear surface and extended seal life.
• Specially formulated Seals and V-Packings offer unmatched performance and extended life.
• Guided valve design for extended valve life.
• Wet-end easily serviced without entering crankcase.

Operating Limits

• Flow: 75 gpm (284 l/m)
• Pressure Range: 100 to 1200 psi (7 to 85 bar)
• Inlet Pressure Range: Flooded to 50 psi (Flooded to 3.5 bar)
• RPM: 650 rpm
• Max. Liquid Temperature: 140°F (60°C)
  • Note: Above 130°F, contact CAT PUMPS for inlet conditions and elastomer recommendations.

Mechanical / Hydraulic

• Bore: 2.165” (55 mm)
• Stroke: 2.579” (65.5 mm)
• Crankcase Capacity: 10 Qts. (9.46 l)
• Inlet Ports (2): 2” NPTF
• Discharge Ports (2): 1-1/4” NPTF
• Shaft Diameter: 1.772” (45 mm)
• Weight:
  • 6775: 356 lbs. (161 kg)
  • 6771: 353 lbs. (160 kg)
  • 6777: 327 lbs. (148 kg)
• Dimensions (L x W x H):
  • 6775, 6777: 31.14 x 24.37 x 12.87” (791 x 619 x 327 mm)
  • 6771: 30.71 x 24.37 x 12.44” (780 x 619 x 316 mm)

Electrical

Electric Horsepower Requirements:

Formulas for System Sizing:

• Determining the Pump RPM: Rated gpm / Rated rpm = "Desired" gpm / "Desired" rpm
• Determining the Required H.P.: gpm x psi / 1460 = Electric Brake H.P. Required
• Determining Motor Pulley Size: Motor Pulley O.D. / Pump rpm = Pump Pulley O.D. / Motor rpm

Safety Information

All High Pressure Systems require a primary pressure regulating device (e.g., regulator, unloader) and a secondary pressure relief device (e.g., pop-off valve, relief valve). Failure to install such relief devices could result in personal injury or damage to pump or property. CAT PUMPS does not assume any liability or responsibility for the operation of a customer’s high pressure system. Read all CAUTIONS and WARNINGS before commencing service or operation of any high pressure system.

Materials of Construction

The document provides an extensive parts list with material codes. Key materials include:

• Model 6775 (Standard Brass): Brass, Steel (Chrome Plated, Zinc Plated, plain Steel), Aluminum, Nitrile (NBR), Ceramic, Acetal, PTFE, PVDF, Chrome-Moly, Forged Chrome-Moly.
• Model 6771 (Stainless Steel): 304SS, 316SS, Steel (Chrome Plated, Zinc Plated, plain Steel), Aluminum, Nitrile (NBR), Ceramic, Acetal, PTFE, PVDF, Chrome-Moly, Forged Chrome-Moly.
• Model 6777 (Nickel Aluminum Bronze): Nickel Aluminum Bronze (plain and Chrome Plated), Steel (Chrome Plated, Zinc Plated, plain Steel), Aluminum, Nitrile (NBR), Ceramic, Acetal, PTFE, PVDF, Chrome-Moly, Forged Chrome-Moly.
• Plungers: Special concentric, high-density, polished, solid ceramic.
• Manifolds: High tensile strength brass (6775), 316 stainless steel (6771), or nickel aluminum bronze (6777).
• Valves, Seats, and Springs: Stainless steel.
• Seals and V-Packings: Specially formulated materials, including NBR, FPM (Fluorocarbon), and EPDM.

Note: See the official PDF for exact tabulated values and a complete list of materials for each component.

Additional Notes

• Shaft protection and rails are included with the pump.
• A C.A.T. (Inlet pressure stabilizer) is highly recommended for pressurized inlet, R.O., and Industrial applications.
• Refer to the pump Service Manual for repair procedures and additional technical information.

---

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original OEM PDF. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror