6841-6861-6841K-6861K

Summary

Product Identification

• Type: 68 Frame Block-Style Stainless Steel Plunger Pump
• Models: 6841, 6841K, 6861, 6861K
• Design: Triplex plunger design

Features

• Superior Design:
  • Triplex plunger design provides smoother liquid flow.
  • Inlet and discharge valve assemblies interchange for easier maintenance.
  • Oil bath crankcase assures optimum lubrication.
  • Close tolerance concentricity of the ceramic plunger maximizes seal life.
  • Standard Models: Lo-Pressure Seals and V-Packings are completely lubricated and cooled by the pumped liquid.
  • Flushed Models (K Models): Special ported inlet manifold permits an external flush liquid providing cooling for hi-temp liquids and lubrication for low lubricity liquids.
• Quality Materials:
  • Precision design 316 stainless steel valves and seats are hardened and polished.
  • 316 SSL block-style manifolds for strength and corrosion resistance.
  • Special concentric, high-density, polished, solid ceramic plungers.
  • Specially formulated, CAT PUMP exclusive, V-Packings.
  • Die cast aluminum crankcase (optional Cast Iron crankcase available for hazardous environments).
  • Chrome-moly crankshaft.
  • Oversized crankshaft bearings.
• Easy Maintenance:
  • Wet-end is easily serviced without entering crankcase.
  • Preset packings mean no packing gland adjustment is necessary.

Operating Limits

• Max. Liquid Temperature: 140°F (60°C)
  • Note: Above 130°F, consult CAT PUMPS for inlet conditions and elastomer recommendations.

Feed Water

• Inlet Pressure Range: Flooded to 50 PSI (Flooded to 3.5 BAR)

Mechanical / Hydraulic

Model-Specific Specifications

• MODEL 6841, 6841K:
  • Flow: 48 GPM (182 L/M)
  • Pressure Range: 100 to 2000 PSI (7 to 140 BAR)
  • RPM: 615 RPM
  • Bore: 1.772" (45 mm)
• MODEL 6861, 6861K:
  • Flow: 60 GPM (227 L/M)
  • Pressure Range: 100 to 1200 PSI (7 to 85 BAR)
  • RPM: 520 RPM
  • Bore: 2.165" (55 mm)

Common Specifications

• Stroke: 2.579" (65.5 mm)
• Crankcase Capacity: 10 Qts. (9.46 L)
• Inlet Ports (2): 2-1/2" NPTF
• Flushing Ports (2): 1/2" NPTF (for Flushed K Models)
• Discharge Ports (2): 1-1/4" NPTF
• Shaft Diameter: 1.772" (45 mm)
• Weight: 460 lbs. (206 kg)
• Dimensions: 28.86 x 24.33 x 12.64" (733 x 618 x 321 mm)

Performance Data (Electric Horsepower Requirements)

The following table outlines the approximate electric horsepower required for various flow and pressure combinations:

Optional Accessories

• Flushing Assembly: 5 gal., 115V, 1.1 Amp, 1/2" NPT (for K models)
• C.A.T. (Inlet pressure stabilizer for RO and boosted inlet applications)
• Cast Iron Crankcase Conversion Assembly
• Oil, Twin Pack (Two 2.5 Gal) ISO 68 Multi-viscosity Hydraulic
• Lubricant, Antiseize (1 oz.)
• Plunger Pump Service DVD

Important Notes

• All systems require both a primary pressure regulating device (e.g., regulator, unloader) and a secondary pressure safety relief device (e.g., pop-off valve, safety valve). Failure to install such relief devices could result in personal injury or damage to the pump or to system components.
• A detailed parts list and exploded view are available in the official PDF.

Disclaimer

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

Official datasheet (PDF)

Lenntech datasheet mirror