3801-3811-3801K-3811K

Summary

Product identification

• Type: 38 Frame Block-Style Stainless Steel Plunger Pump
• Models:
  • 3801, 3801K (Standard and Flushed)
  • 3811, 3811K (Standard and Flushed)

Operating limits

• Inlet Pressure: Flooded to 70 psi (4.9 bar)
• Maximum Liquid Temperature: 160°F (71°C)
  • Note: Above 130°F, contact Cat Pumps for inlet conditions and elastomer recommendations.

Mechanical / hydraulic

Model 3801, 3801K

• Flow: 10.0 gpm (38 lpm)
• Pressure Range: 100 to 5000 psi (7 to 345 bar)
• RPM: 915 rpm
• Bore: 0.787" (20 mm)

Model 3811, 3811K

• Flow: 14 gpm (53 lpm)
• Pressure Range: 100 to 3000 psi (7 to 210 bar)
• RPM: 800 rpm
• Bore: 0.984" (25 mm)

Common Specifications

• Stroke: 1.890" (48 mm)
• Crankcase Capacity: 4.2 Qts. (4 l)
• Inlet Ports (2): 1-1/2" NPTF
• Flushing Ports (2): 1/2" NPTF (for K Models)
• Discharge Ports (2): 1" NPTF
• Pulley Mounting: Either Side
• Shaft Diameter: 1.378" (35 mm)
• Weight: 170 lbs. (77 kg)
• Dimensions: 24.72 x 18.11 x 9.37" (628 x 460 x 238 mm)

Features

• Triplex 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 adjustments.
• 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.
• Interchangeable inlet and discharge valves for easy servicing.
• Wet-end easily serviced without entering crankcase.
• K Models feature a special Flushed Inlet Manifold for external flush, aiding cooling with high-temperature liquids and lubrication with low-lubricity liquids.

Electrical

Electric Horsepower Requirements

• Model 3801, 3801K (10.0 gpm / 38.0 lpm @ 915 rpm):
  • 4000 psi (275 bar): 27.4 HP
  • 4500 psi (310 bar): 30.8 HP
  • 5000 psi (345 bar): 34.2 HP
• Model 3801, 3801K (9.0 gpm / 34.0 lpm @ 824 rpm):
  • 4000 psi (275 bar): 24.7 HP
  • 4500 psi (310 bar): 27.8 HP
  • 5000 psi (345 bar): 30.9 HP
• Model 3801, 3801K (8.0 gpm / 30.0 lpm @ 732 rpm):
  • 4000 psi (275 bar): 22.0 HP
  • 4500 psi (310 bar): 24.7 HP
  • 5000 psi (345 bar): 27.5 HP
• Model 3811, 3811K (14.0 gpm / 53.0 lpm @ 800 rpm):
  • 2000 psi (140 bar): 19.2 HP
  • 2500 psi (175 bar): 24.0 HP
  • 3000 psi (210 bar): 28.8 HP
• Model 3811, 3811K (12.0 gpm / 45.0 lpm @ 685 rpm):
  • 2000 psi (140 bar): 16.5 HP
  • 2500 psi (175 bar): 20.6 HP
  • 3000 psi (210 bar): 24.7 HP
• Model 3811, 3811K (10.0 gpm / 38.0 lpm @ 571 rpm):
  • 2000 psi (140 bar): 13.7 HP
  • 2500 psi (175 bar): 17.2 HP
  • 3000 psi (210 bar): 20.6 HP

Parts List

A detailed parts list and exploded view are provided in the original document, including part numbers, quantities, materials, and descriptions for various components such as keys, screws, bearings, crankshaft, plungers, seals, manifolds, and valve kits. Different material options (e.g., NBR, FPM, EPDM) are listed for many O-rings and seals.

Important 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 the pump or property. Read all CAUTIONS and WARNINGS before commencing service or operation of any high pressure system.

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 for the project.

Official datasheet (PDF)

Lenntech datasheet mirror