GP TP2530J34 Pump Assembly – 3.0 GPM, 2,500 PSI, 3/4" Shaft

Professional Triplex Pump for Reliable Gas Pressure Washer Performance

The GP TP2530J34 Pump Assembly (Bare Pump Part #85.130.020SP) is a robust triplex direct-drive gas pump designed to deliver consistent cleaning power and long-term durability. Capable of producing up to 2,500 PSI at 3.0 GPM, this pump is an excellent replacement or upgrade for gas-powered pressure washers used in residential, agricultural, and light commercial applications.

Built by General Pump (GP), a trusted name in pressure washer technology, the TP2530J34 combines ceramic plungers, a brass manifold, and an external unloader into a pump engineered for efficiency and long-lasting service. Backed by a 5-year warranty, this pump is built to handle tough cleaning jobs with confidence.

Key Features

• Bare Pump Part #: 85.130.020SP

• Pump Manufacturer: General Pump (GP)

• Pump Model: TP2530J34

• Pump Style: Triplex, direct-drive gas

• Max PSI: 2,500

• Max GPM: 3.0

• Shaft Size: 3/4"

• Unloader Type: External (85.300.003)

• Plunger (Piston): Ceramic for durability and thermal stability

• Inlet Size: 3/4" GHF (garden hose fitting)

• Discharge Size: 3/8" Brass QC (85.300.103)

• Soap Injector: Adjustable (85.400.000)

• Manifold Type: Brass for strength and corrosion resistance

• RPM: 3,450

• Max Inlet Temp: 74°C / 165°F

• Thermal Relief Valve: 85.300.023 included

• Oil Capacity: 11 oz

• Oil Type: 30W non-detergent oil

• Weight: 11.5 lbs

• Warranty: 5 Years

Engineered for Smooth, Reliable Operation

The triplex plunger design sets the TP2530J34 apart from axial pumps, providing smoother operation, higher efficiency, and longer lifespan. Using three precision ceramic plungers, this pump reduces vibration, handles higher temperatures, and delivers consistent high-pressure water for extended use.

With 2,500 PSI of pressure and a flow rate of 3.0 GPM, this pump is designed for versatility. It provides strong cleaning power while maintaining enough water volume to efficiently cover large surface areas. This makes it a great choice for homeowners, farmers, and contractors who want dependable performance.

The brass manifold ensures durability against corrosion and pressure fatigue, while the ceramic plungers provide superior resistance to heat and abrasion, ensuring the pump delivers reliable performance over time.

User-Friendly Features

The external unloader (85.300.003) offers flexibility and serviceability, allowing operators to adjust pressure outside the pump body and easily replace or maintain the unloader without disturbing the pump itself.

The adjustable soap injector (85.400.000) gives users control over detergent application. By switching to a low-pressure nozzle, cleaning solutions can be injected directly into the water stream, with adjustable flow to match the cleaning task.

The brass quick-connect discharge fitting (3/8”) makes connecting hoses fast and reliable, reducing setup time and eliminating leaks.

Durability and Protection

To protect the pump during long bypass cycles, the TP2530J34 includes a thermal relief valve (85.300.023). This valve automatically purges overheated water and replaces it with cooler water to protect seals and internal components from heat damage.

The pump has a maximum inlet water temperature of 165°F (74°C), giving it superior tolerance compared to many models. This feature provides greater flexibility for applications where warmer water supplies are used or when heavy-duty cleaning demands extra resilience.

Routine maintenance is straightforward. The pump requires 11 oz of 30W non-detergent oil to keep its moving components properly lubricated. Regular oil checks and changes are simple tasks that help maximize service life.

At 11.5 lbs, the pump is lightweight enough for easy installation while still heavy-duty in construction for reliable performance.

Common Applications

The GP TP2530J34 Pump Assembly is versatile enough to handle a wide range of cleaning needs for both homeowners and professionals. Typical uses include:

• Concrete Cleaning – Remove dirt, oil, and stains from driveways and sidewalks.

• Decks, Patios, and Fences – Restore wood, vinyl, or stone surfaces.

• Fleet and Vehicle Washing – Keep cars, trucks, trailers, and boats clean.

• Agricultural Equipment – Wash tractors, implements, and farm machinery.

• Construction Sites – Clean off dirt and grime from jobsite equipment.

• Property Maintenance – Handle siding, outdoor furniture, and other surfaces.

Its 3/4” shaft size makes it compatible with many gas-powered engines, providing a dependable replacement option for pressure washer owners who need reliable output.

Product Specifications

• Part #: 85.130.020SP

• Manufacturer: General Pump (GP)

• Model: TP2530J34

• Style: Triplex, direct-drive gas

• Max Pressure: 2,500 PSI

• Max Flow Rate: 3.0 GPM

• Shaft Size: 3/4”

• RPM: 3,450

• Unloader: External (85.300.003)

• Soap Injector: Adjustable (85.400.000)

• Manifold Material: Brass

• Plunger Material: Ceramic

• Inlet Connection: 3/4” GHF

• Discharge Connection: Brass QC 3/8" (85.300.103)

• Oil Capacity: 11 oz (30W non-detergent oil)

• Thermal Relief Valve: 85.300.023

• Max Inlet Temp: 74°C / 165°F

• Weight: 11.5 lbs

• Warranty: 5 Years

Backed by GP Quality

General Pump (GP) is one of the most respected names in the pressure washer industry, known for designing pumps that combine performance, durability, and innovation. The TP2530J34 Pump Assembly continues this legacy with its triplex design, ceramic plungers, brass manifold, and external unloader.

Backed by a 5-year warranty, this pump offers long-term peace of mind and exceptional value.

When you need reliable performance, versatile cleaning power, and professional-grade durability, choose the GP TP2530J34 Pump Assembly—engineered for results, built to last.