Description
The Cat Pumps Model 3CP1120 is a compact, high-performance triplex plunger pump from the 3CP series. Renowned for its “over-built” design and longevity, this pump is a staple in the car wash and pressure washing industries, specifically engineered for direct-drive electric motor applications.
Technical Specifications
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Flow Rate: 4.2 GPM (16.0 LPM)
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Pressure Range: 100 to 2200 PSI (7 to 152 bar)
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Speed: 1725 RPM (Standard 4-pole motor speed)
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Shaft Diameter: 20 mm (Solid Shaft)
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Inlet Port: 1/2″ NPT(F)
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Discharge Port: 3/8″ NPT(F)
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Max Liquid Temp: 160°F (71°C)
Key Features
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Precision Ceramic Plungers: Equipped with solid alumina ceramic plungers (Part #46976) that provide an ultra-smooth finish, reducing friction and extending the life of high-pressure seals.
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Compact 3CP Frame: The smaller footprint allows for easy integration into tight spaces, such as car wash equipment rooms or mobile pressure washing skids.
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Forged Brass Manifold: Provides superior strength and corrosion resistance against standard detergents and water-treatment chemicals.
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Direct Drive Design: At 1725 RPM, it is optimized for a 1:1 drive ratio with a 7.5 HP electric motor via a flexible coupler or bell housing.
Essential Service Kits
To maintain the 3CP1120 at peak performance, use the following genuine Cat Pumps kits:
| Kit Description | Part Number | Quantity Required |
| Seal Kit (Standard) | 33061 | 1 Kit per pump |
| Valve Kit | 33062 | 2 Kits required for full service |
| Ceramic Plunger | 46976 | 3 required for full replacement |
| Crankcase Oil | 6107 | ISO 68 Non-Detergent (11.8 oz capacity) |




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