3535-3535C-3531-3531C-3537

Summary

Product identification

This document describes the CAT Pumps 35 Frame Plunger Pump models: 3535, 3535C, 3531, 3531C, and 3537.

• Models 3535, 3535C: Brass (Standard and Flushed)
• Models 3531, 3531C: Stainless Steel (Standard and Flushed)
• Model 3537: Nickel Aluminum Bronze (Standard)

Operating limits

• Flow: 36 gpm (136 l/m)
• Pressure Range: 100 to 1200 psi (7 to 85 bar)
• Inlet Pressure Range: Flooded to 70 psi (Flooded to 0.9 bar)
• RPM: 800 rpm
• Maximum Liquid Temperature: 160°F (70°C)
  • Note: Above 130°F, contact CAT PUMPS for specific inlet conditions and elastomer recommendations.

Electrical

The datasheet provides an "ELECTRIC HORSEPOWER REQUIREMENTS" table, detailing required horsepower based on flow rate and pressure at various RPMs (800, 667, 556 rpm).

• For exact tabulated values, consult the official PDF.
• Formulas are provided for determining pump RPM, required horsepower, and motor pulley size.
• Consult CAT PUMPS for specific pump and motor pulley sizes.

Mechanical / hydraulic

• Bore: 1.575” (0 mm)
• Stroke: 1.890” (8 mm)
• Crankcase Capacity: 0.2 Qts.
• Inlet Ports (2): 1-1/2” NPTF
• Flushing Ports (2) (Models 3531C, 3535C): 1/4” NPTF
• Discharge Ports (2): 1” NPTF
• Pulley Mounting: Either Side
• Shaft Diameter: 1.378” (35 mm)
• Weight: 139 lbs. (63 kg)
• Dimensions (Models 3535, 3535C): 23.87 x 18.11 x 9.72” (606.5 x 60 x 27 mm)
• Dimensions (Models 3531, 3531C, 3537): 24.33 x 18.11 x 9.72” (618 x 60 x 27 mm)

Features

• Triplex design for high efficiency and low pulsation.
• Durable dual V-Packings, lubricated and cooled by pumped liquid.
• Pre-set Lo-Pressure Seals provide secondary protection against external leaks, requiring no adjustments.
• Special high-density, polished, concentric plungers for true wear surface and extended seal life.
• Specially formulated Seals and V-Packings for unmatched performance and extended life.
• Interchangeable inlet and discharge valves for easy servicing.
• Wet-end can be serviced without entering the crankcase.
• Die cast aluminum crankcase for high strength, lightweight, and excellent tolerance control.
• Oversized crankshaft bearings for extended bearing life and pump performance.
• Chrome-moly crankshaft for strength and surface hardness.
• Matched oversized TNM connecting rods for superior tensile strength and bearing quality.
• Special stainless steel plunger rods with high strength crossheads for longevity and corrosion resistance.
• Stainless steel slinger provides backup protection for the crankcase seal.
• Special concentric, high-density, polished, solid ceramic plungers for extended seal life.
• Manifolds are high tensile strength forged brass, 316 stainless steel, duplex stainless, or nickel aluminum bronze for continuous duty.
• 100% wet seal design for extended service life by cooling and lubricating both sides.
• Stainless steel valves, seats, and springs for corrosion-resistance, ultimate seating, and extended life.
• Crossheads are 360° supported for uncompromising alignment.
• Special Flushed Inlet Manifold allows external flush for added cooling with high temperature liquids and lubrication with low lubricity liquids.

Parts List

A detailed parts list, including part numbers, descriptions, quantities, and material codes (ABS, AL, BB, BBCP, CC, CM, D, EPDM, F, FBB, FBR, FCM, FPM, NAB, NBR, NBRS, NY, POP, PTFE, PVDF, S, SS, SSD, SSL, SSZZ, STCP, SFG, STG, STL, STZP, TNM, ZP), is available in the official PDF.

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

Official datasheet (PDF)

Lenntech datasheet mirror