Cat Pump 430.011 Piston Pump 4 Frame — Triplex 5 GPM, 1000 PSI Belt-Drive Pump
The Cat Pump 430.011 is a 4 Frame triplex piston pump built for operations that run long hours and cannot afford downtime. It moves up to 5 GPM at a maximum of 1000 PSI while turning a relaxed 1040 RPM, and that low operating speed is the whole point of the design. Slower reciprocation means gentler loading on the pistons and seals, stronger suction at the inlet, and a service life that stretches well past what a high-speed pump delivers in the same duty. Three pistons working in sequence keep the discharge smooth and the pulsation low, which protects downstream nozzles, filters, and fittings.
Construction is what separates this pump from lighter-duty alternatives. The chrome-plated brass manifold resists corrosion and scale, the valve assemblies are 304 stainless steel, and the sleeves and cylinders are chrome-plated 304 stainless as well. The 430.011 configuration ships with fluorocarbon (Viton) seals and o-rings, so it handles a wider range of solutions, warmer fluids, and more aggressive chemistry than a standard Buna-N build. A solid shaft and belt or clutch drive setup let you dial in the exact flow and pressure your system needs by changing pulley ratios rather than replacing the pump.
Because it is a positive displacement design, output stays predictable as system pressure changes — useful in misting and humidification, reverse osmosis and water treatment boost duty, agricultural and horticultural spraying, vehicle and equipment washdown, dust suppression, hydrostatic testing, and general industrial process transfer. Pair it with a properly sized regulator or unloader and an adequate inlet supply, keep the crankcase oil clean, and the 430.011 will quietly do its job for years.
Key Features
- Triplex piston design for smooth, low-pulsation flow
- Low 1040 RPM operating speed for extended pump and seal life
- Chrome-plated brass manifold for corrosion and scale resistance
- 304 stainless steel valve assemblies for durability under continuous duty
- Chrome-plated 304 stainless steel sleeves and cylinders
- Fluorocarbon (Viton) seals and o-rings for broader chemical and temperature compatibility
- Solid shaft with belt or clutch drive flexibility
- Positive displacement output that stays consistent as pressure varies
- Strong inlet suction characteristics from the low-speed design
- Compact 4 Frame footprint for tight equipment packages
Applications
- Misting, fogging, and humidification systems
- Reverse osmosis and water treatment boost service
- Agricultural, horticultural, and greenhouse spraying
- Vehicle, fleet, and equipment washdown
- Car wash and self-serve wash bay systems
- Dust suppression and odor control
- Hydrostatic and pressure testing
- Industrial process and chemical transfer
- Food, beverage, and sanitation rinse duty
- General plant washdown and cleaning equipment
Specifications
- Manufacturer: Cat Pumps
- Model: 430.011 (430.0110)
- Frame: 4 Frame
- Pump Type: Triplex reciprocating positive displacement piston pump
- Maximum Flow: 5.0 GPM (18.9 LPM)
- Maximum Discharge Pressure: 1000 PSI (69 bar)
- Operating Speed: 1040 RPM
- Required Horsepower: 3.4 HP
- Inlet Port Size: 1/2 in. NPT female
- Discharge Port Size: 3/8 in. NPT female
- Shaft Diameter: 16.5 mm (0.650 in.), solid shaft
- Bore: 20 mm (0.709 in.)
- Stroke: 19.5 mm (0.768 in.)
- Maximum Liquid Temperature: 160°F (71°C)
- Crankcase Oil Capacity: 21 oz (oil sold separately)
- Manifold: Chrome-plated brass
- Valves: 304 stainless steel
- Sleeves and Cylinders: Chrome-plated 304 stainless steel
- Seals and O-Rings: Fluorocarbon (Viton)
- Drive: Belt or clutch drive
- Dimensions: 12.56 in. L x 8.80 in. W x 5.33 in. H
Frequently Asked Questions
Q: Does the Cat Pump 430.011 arrive filled with crankcase oil?
A: No. The pump ships dry, so you need to fill the crankcase with the correct Cat Pumps crankcase oil to the 21 oz capacity before the first start. Running it dry even briefly will damage the crank and bearings.
Q: Can I run this pump directly off a motor shaft instead of a belt?
A: The 430.011 uses a solid shaft and is designed for belt or clutch drive. That arrangement lets you select a pulley ratio that holds the pump at 1040 RPM while your motor runs at its own rated speed, which is how the pump achieves its long service life.
Q: What kind of inlet supply does it need?
A: Provide a flooded or lightly pressurized inlet through the 1/2 in. NPT port with adequate line size and a clean filter. Starving the inlet is the fastest way to cause cavitation, noisy operation, and premature seal wear.
Q: Why does this version use Viton seals instead of standard ones?
A: The fluorocarbon seals and o-rings in the 430.011 tolerate a wider chemical range and warmer fluids than Buna-N. That makes it a better fit for detergent solutions, treated water, and mild process chemistry.
Q: How do I set the working pressure below 1000 PSI?
A: Install a properly sized regulator or unloader valve on the discharge side and adjust it to your target pressure. Never restrict the discharge without a pressure-relief path, since a positive displacement pump will keep pushing until something gives.
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