Cat Pumps 3CP1140 Triplex Plunger Pump — 3.6 GPM at 2200 PSI, 1725 RPM
The Cat Pumps 3CP1140 is a compact triplex plunger pump built for equipment that has to run high-pressure water day in and day out without drama. It moves up to 3.6 GPM and handles pressures from roughly 100 up to 2200 PSI at 1725 RPM, which puts it right in the sweet spot for pressure washing rigs, car wash bays, misting lines and a long list of general industrial cleaning jobs. Because it uses three plungers instead of one or two, the flow comes out smooth and steady, so downstream nozzles, guns and control valves see far less pulsation and last longer.
Inside, the 3CP1140 uses the same construction philosophy that made the 3CP series a shop favorite. The forged brass manifold resists corrosion and holds pressure without flexing, the solid ceramic plungers shrug off the abrasion that ruins softer plunger materials, and the 304 stainless steel inlet and discharge valves open hydraulically and close under spring load for fast, repeatable sealing. A forged chrome-moly crankshaft running in a die-cast aluminum crankcase carries the load, and standard Buna-N (NBR) seals and O-rings cover the majority of ambient-temperature water applications. High-temperature and specialty seal versions exist under related part numbers when the fluid runs hotter or a different chemistry is involved.
Mounting is flexible, which is part of why this pump shows up in so many different machines. The solid shaft accepts belt drive, clutch, flexible coupling or bellhousing arrangements, so it can be paired with an electric motor or a small gas engine depending on how the system is laid out. At 2200 PSI it wants about 5.4 HP behind it. Rebuild kits and wear parts are widely stocked, so a pump that has put in a few thousand hours can usually be brought back to spec with seals, valves and a little bench time rather than being replaced outright.
Key Features
- Triplex plunger design for smooth, low-pulsation flow and consistent pressure output
- Forged brass manifold for corrosion resistance and dimensional stability under load
- Solid ceramic plungers for long life in abrasive and high-cycle service
- 304 stainless steel inlet and discharge valve assemblies, spring-loaded closed and hydraulically opened
- Forged chrome-moly crankshaft supported in a die-cast aluminum crankcase
- Standard NBR (Buna-N) seals and O-rings for common ambient-temperature water service
- Solid shaft accepts belt, clutch, flexible coupling or bellhousing drive arrangements
- Compact, lightweight footprint that fits tight equipment frames and skids
- Fully rebuildable with widely available seal, valve and plunger service kits
Applications
- Pressure washing and hot water cleaning equipment
- Car wash and truck wash systems
- Industrial and commercial parts cleaning
- High-pressure misting, fogging and humidification systems
- Reverse osmosis and general water treatment feed service
- Agricultural and horticultural spraying equipment
- Food and beverage plant washdown systems
- Dust suppression and evaporative cooling
- General OEM high-pressure water transfer
Specifications
- Model: 3CP1140
- Pump Type: Triplex positive displacement plunger pump
- Maximum Flow: 3.6 GPM (13.6 L/min)
- Pressure Range: 100 to 2200 PSI (7 to 155 BAR)
- Maximum Speed: 1725 RPM
- Inlet Port Size: 1/2" NPT (F)
- Discharge Port Size: 3/8" NPT (F)
- Inlet Pressure Range: Flooded to 70 PSI (flooded to 4.9 BAR)
- Maximum Liquid Temperature: 160°F (71°C)
- Horsepower Required: Approximately 5.4 HP at 2200 PSI
- Stroke: 0.433" (11 mm)
- Bore: 0.709" (18 mm)
- Shaft Diameter: 0.650" (16.5 mm)
- Shaft Configuration: Solid shaft
- Crankcase Oil Capacity: 11.8 oz. (0.35 L)
- Manifold Material: Forged brass
- Plungers: Solid ceramic
- Valves: 304 stainless steel
- Seals and O-Rings: NBR (Buna-N), standard
- Crankshaft: Forged chrome-moly
- Crankcase: Die-cast aluminum
- Drive Options: Belt, clutch, flexible coupling, bellhousing
- Dimensions: 9.10" x 8.77" x 5.47" (231 x 223 x 139 mm)
Frequently Asked Questions
Q: Does the 3CP1140 come with a motor or engine attached?
A: No. The 3CP1140 is supplied as a pump end only. You select and mount your own electric motor or gas engine using a belt drive, clutch, flexible coupling or bellhousing arrangement to match your system.
Q: What kind of oil does the crankcase take and how often should it be changed?
A: The crankcase holds about 11.8 oz. and uses a dedicated pump crankcase oil rather than automotive motor oil. A common practice is an initial change after the first 50 hours of run time, then every 500 hours or three months of service, whichever comes first.
Q: Can this pump be run dry even briefly?
A: It should not be. Running dry destroys the seals in seconds and can score the ceramic plungers. Always confirm the inlet is flooded and free of air before starting, and protect the pump with an adequate supply line and a clean inlet filter.
Q: What happens if the pump runs faster than 1725 RPM?
A: Exceeding the rated speed increases flow and heat beyond what the seals, valves and bearings were designed for, which shortens service life and can void coverage. Size your pulleys or coupling so operating speed stays at or below the rating.
Q: Is the 3CP1140 rebuildable, or is it a throwaway pump?
A: It is fully rebuildable. Seal kits, valve kits and plunger components are available separately, and most performance loss from age or wear can be corrected on the bench without replacing the entire pump.
CLRMarine
