Cat Pumps 35 frame plunger pomp 3521

Cat Pumps 3521 Plunger Pump

The Cat Pumps 3521 is a powerful industrial plunger pump from the 35-frame series, engineered for continuous-duty operation in demanding environments. Its robust design and use of high-quality materials ensure exceptional reliability and a long service life. With a flow rate of up to 94.6 l/min (25 gpm) and a maximum working pressure of 138 bar (2000 psi), this model is ideally suited for industrial, marine, cleaning, and process installations.

Key Features Cat Pumps 3521

• Triplex design for high efficiency and minimal pulsation.

• Reinforced connecting rod and plunger rod materials for optimal performance under continuous-duty conditions.

• Fully lubricated V-packings and low-pressure seals, cooled by the pumped liquid, significantly extend service life.

• Model 3521C is optionally available with external flush ports, ideal for high-temperature or low-lubricity liquids.

• Standard NBR seals, with optional alternatives (FPM, EPDM, FFKM) for higher temperature or chemical compatibility.

Technical Specifications Cat Pumps 3521

• Model: 3521 (Stainless Steel)

• Flow: 94.6 l/min (25 gpm)

• Working Pressure: 100–2000 psi (6.9–138 bar)

• Pump Speed: 870 rpm

• Minimum Speed: 100 rpm

• Inlet Pressure: Flooded to 4.8 bar

• Max. Fluid Temperature (NBR): 71°C (160°F)
  (FPM up to 82°C, FFKM up to 93°C)

• Bore / Stroke: 32 mm / 48 mm

• Connections:
  • Inlet: 1½” NPT(F)
  • Flush: ¼” NPT(F)
  • Discharge: 1” NPT(F)

• Shaft Diameter: 35 mm – mountable on either side

• Crankcase Capacity: 4.2 liters

• Dimensions (L x W x H): 618 x 460 x 247 mm

• Weight: 63 kg

Model 3521DHS is supplied with a shaft protector. Mounting rails sold separately.

Alternative seal configurations Cat Pumps 3521