Cat Pump 310 Plunger Pump, 5 Frame Triplex Belt Drive Pump Model 310
The Cat Pump 310 is a 5 frame triplex plunger pump built for equipment that runs long hours and cannot afford downtime. It moves up to 4 gallons per minute and handles pressures up to 2200 PSI at 950 RPM, which puts it in a comfortable middle ground: strong enough for serious cleaning and process duty, but small and light enough to mount on a skid, a cart, or inside a compact machine frame. The belt drive configuration lets you dial in the speed and pressure your application actually needs rather than accepting whatever a direct-coupled motor happens to deliver.
Inside, the design follows the pattern that made these pumps a standard on service trucks and plant floors alike. Solid ceramic plungers ride against preset high pressure packings, so abrasive water and dissolved solids wear far more slowly than they would against metal. The chrome plated brass manifold carries 304 stainless steel valve assemblies that are interchangeable between the inlet and discharge positions, which cuts the number of spare parts you need to stock. An oil bath crankcase with oversized crankshaft bearings keeps the lower end cool and quiet through continuous operation.
Practically speaking, the 310 shows up wherever clean, steady high pressure flow matters. It drives industrial washdown and parts cleaning lines, feeds reverse osmosis membranes, powers misting and humidification systems, supplies hydrostatic test benches, and serves as a replacement pump in car wash, truck wash, and mobile pressure washing equipment. Dual 1/2 inch NPT inlet ports and dual 3/8 inch NPT discharge ports on opposite sides of the manifold give you flexibility in plumbing the pump into an existing layout without reworking the whole system. Seal materials can be specified in Buna-N, Viton, or EPDM depending on what the pump is asked to move.
Key Features
- Triplex plunger design delivers smooth, low pulsation flow
- Solid ceramic plungers resist abrasion and extend seal life
- Chrome plated brass manifold with 304 stainless steel valve assemblies
- Interchangeable inlet and discharge valve assemblies reduce spare parts inventory
- Preset high pressure packings require no field adjustment
- Oil bath crankcase with oversized crankshaft bearings for continuous duty
- Heat treated valves and seats for long service life
- Belt drive configuration allows pressure and speed to be matched to the application
- Dual inlet and dual discharge ports for flexible plumbing
- Compatible with clutch, flexible coupling, and bellhousing drive arrangements
- Seal options available in Buna-N, Viton, and EPDM
Applications
- Industrial and commercial washdown systems
- Car wash, truck wash, and fleet wash equipment
- Mobile and stationary pressure washing units
- Reverse osmosis and membrane feed boosting
- Misting, fogging, and humidification systems
- Parts washing and degreasing lines
- Hydrostatic and pressure testing benches
- Agricultural spraying and sanitation equipment
- Dust suppression systems
- General water transfer at elevated pressure
Specifications
- Model: 310
- Pump Frame: 5 Frame
- Pump Type: Triplex plunger pump
- Drive Type: Belt drive
- Maximum Flow: 4.0 GPM (15.1 LPM)
- Pressure Range: 100 to 2200 PSI (7 to 152 BAR)
- Maximum RPM: 950
- Inlet Port Size: Two 1/2 inch NPT (F)
- Discharge Port Size: Two 3/8 inch NPT (F)
- Stroke: 0.709 inch (18 mm)
- Shaft Diameter: 0.787 inch (20 mm)
- Crankcase Oil Capacity: 18 oz (0.55 L)
- Manifold Material: Chrome plated brass
- Valve Material: 304 stainless steel
- Plunger Material: Solid ceramic
- Seal Material: NBR (Buna-N) standard, Viton and EPDM optional
- Inlet Pressure Range: -5 to 60 PSI
- Maximum Liquid Temperature: 160°F (71°C)
- Overall Dimensions: 11.73 x 10.00 x 5.24 inches
Frequently Asked Questions
Q: Can the Cat Pump 310 be run below its 950 RPM rating?
A: Yes. The 310 is a belt drive pump, so pulley sizing lets you run it at reduced speed for lower flow, and it will operate reliably well below the maximum rating as long as inlet supply and lubrication remain adequate.
Q: Does the pump need a pressure regulator or unloader installed?
A: Yes. A positive displacement plunger pump moves the same volume every revolution regardless of downstream restriction, so an unloader or pressure regulating valve sized to the flow must be installed on the discharge line to prevent dangerous pressure buildup.
Q: What kind of oil does the crankcase take and how often should it be changed?
A: The crankcase uses a dedicated pump crankcase oil rather than automotive motor oil. The typical practice is an initial change after roughly 50 hours of break-in, then every 500 hours or three months of service, whichever comes first.
Q: Will this pump handle liquids other than water?
A: It handles a range of compatible fluids provided the manifold, valve, plunger, and seal materials suit the liquid. Buna-N is the standard seal, with Viton and EPDM available for fluids that attack nitrile, and chemical compatibility should be confirmed before use.
Q: How is the pump mounted and oriented?
A: The 310 is designed for horizontal mounting on a rigid base with the crankcase oil level visible at the sight glass. The dual port arrangement on both sides of the manifold allows the inlet and discharge plumbing to be routed from whichever side suits the equipment layout.
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