Cat Pumps lists this model as obsolete in the 7 Frame Plunger Pump range. Current models with a comparable duty point: 530, 550, 56, 57. We can still source parts and service documentation for it — and we will confirm the correct current replacement for your duty point before you order.
CAT Pumps 55.3000 Pump, 5.0 GPM, 3000 PSI
Genuine Cat Pumps OEM — Cat Pumps Corporation, HQ Minneapolis, MN — supplied by ForeverPure Corporation, an authorized Cat Pumps distributor in Santa Clara, California.
The Cat Pumps 55.3000 is a genuine Cat Pumps OEM pump for Cat Pumps industrial triplex pumps. Supplied direct through Cat Pumps Corporation — built, machined, and pressure-tested to the original factory specification.
Typical Applications & Industries
Common Applications
- Commercial & industrial reverse osmosis
- Pressure washing & car wash
- Industrial cleaning & wash-down
- Agricultural spraying
- Misting & evaporative cooling
- Food & beverage process water
Industries Served
- Water treatment & desalination
- Commercial car wash & detailing
- Agriculture & irrigation
- Oil & gas (produced water)
- Food & beverage processing
- Industrial cleaning & facility services
Documentation & Service
🔧 Cat Pumps Service Manual (PDF)
The data sheet carries the specifications, the exploded view, the numbered parts list and the seal and valve kit tables. The service manual covers installation and start-up, valve and seal servicing, the torque chart and troubleshooting.
Cat Pumps lists this model as obsolete. The documentation below is the last published revision and remains valid for servicing an installed pump. Ask us about a current replacement. Cat Pumps does not publish a usable data sheet for this model — the sheet covering it sets several pumps side by side, so its figures cannot be attributed to this model with confidence and none are shown. Tell us your duty and we will confirm the detail with Cat Pumps before you order.
Specifications & Dimensions
| Specification | Value | Metric |
|---|---|---|
| Max Flow | 5 gpm / 18.9 lpm | — |
| Max Pressure | 3000 | — |
| RPM | 1415 | — |
| Inlet Port Size | 1/2" NPT(F) | — |
| Discharge Port Size | 3/8" NPT(F) | — |
| Material | Brass | — |
Figures as published by Cat Pumps for this model. Cat publishes the envelope and the port and shaft interface but no dimensioned outline drawing; ask us if you need one for a skid layout.
Performance & Sizing
The 55.3000 is a positive-displacement pump, so it has no flow-versus-pressure curve in the sense a centrifugal pump does, and Cat Pumps does not publish one. Flow is set by the displacement and the shaft speed and stays essentially constant as discharge pressure rises. Pressure is set by the restriction downstream — the nozzle, orifice or membrane array — and capped by the regulating device, not by the pump.
To work out flow at another speed, or to size the drive, use the relations Cat Pumps prints on its data sheets:
| Flow at another speed | Desired GPM = Rated GPM × (Desired RPM ÷ Rated RPM) |
| Required horsepower | HP (electric brake) = GPM × PSI ÷ 1460 |
Rated speed for this model is 1415 rpm.
Maximum ratings apply individually — do not assume maximum flow and maximum pressure can be taken together. A primary pressure-regulating device and a secondary safety relief device are both required in the system. Talk to us before ordering if your duty sits near a limit.
Frequently Asked Questions
What is the Cat Pumps 55.3000?
The Cat Pumps 55.3000 is a genuine Cat Pumps OEM pump for Cat Pumps industrial triplex pumps. Supplied through Cat Pumps Corporation (HQ Minneapolis, MN) and built to the original factory specification.
Is this the correct pump for my pump?
Cat Pumps parts are model-specific — share your Cat pump's model number, serial number, and date of manufacture with the ForeverPure applications team and we'll confirm the correct pump for your unit.
Where is the Cat Pumps 55.3000 manufactured?
Cat Pumps Corporation is headquartered in Minneapolis, Minnesota (1681 94th Lane NE, Minneapolis, MN 55449) and has been the Cat Pumps brand owner since 1968. Cat Pumps triplex pumps, spare parts, and accessories are manufactured at the company's US and Japan production facilities to Cat Pumps Corporation's ISO 9001:2015 factory specifications — the country of origin for this specific SKU is listed in the technical specifications table above.
How do I get a quote or datasheet for the Cat Pumps 55.3000?
Call ForeverPure Corporation at +1-408-969-2688, email sales@foreverpure.com, or request a quote through the website. As an authorized Cat Pumps distributor, ForeverPure provides factory-direct pricing, datasheets, cross-reference support, and same-day turnaround on most quote requests.
What is the warranty on the Cat Pumps 55.3000?
Cat Pumps factory warranty: 1 year on complete pumps, 90 days on parts and accessories, from date of purchase from an authorized distributor. ForeverPure honors and administers Cat Pumps warranty claims for customers in North America.
