Part Number: TSS1511-VRT3-310EZ
Category: Pressure Washer Pumps → Triplex Pumps → Ready-to-Install Pump Assemblies
Type: General Pump TSS1511-VRT3-310EZ Pump Made Ready with Thermal Relief

The General Pump TSS1511-VRT3-310EZ Pump Made Ready with Thermal Relief is a factory-configured, ready-to-install triplex pressure washer pump assembly engineered for demanding commercial and industrial cleaning applications. Built around the General Pump TSS1511 triplex pump, this complete assembly comes pre-equipped with a VRT3-310EZ unloader valve and thermal relief valve, minimizing installation time while providing reliable pressure regulation and enhanced pump protection.

Key Features & Benefits

• Genuine General Pump ready-to-install pump assembly
• Built around the General Pump TSS1511 triplex pump
• Pre-installed VRT3-310EZ unloader valve
• Includes factory-installed thermal relief valve
• Rated for 4.0 GPM at 3,500 PSI
• Low-speed 1,450 RPM operation for extended pump life
• 24 mm solid shaft
• Compatible with systems requiring approximately 9.5 BHP (12.5 GHP)
• Reduces installation time with factory-installed components
• Helps protect the pump from overheating during bypass operation
• Designed for commercial and industrial pressure washer systems

Technical Specifications

Pump Model: TSS1511

Manufacturer: General Pump (GP)

Product Type: Pump Made Ready Assembly

Maximum Flow Rate: 4.0 GPM

Maximum Pressure: 3,500 PSI

Maximum Speed: 1,450 RPM

Brake Horsepower (BHP): 9.5

Gas Horsepower (GHP): 12.5

Shaft Size: 24 mm

Unloader Valve: VRT3-310EZ

Thermal Relief Valve: Included

Weight: 41 lbs

OEM Replacement: Yes

Compatible Applications

Designed for use with compatible pressure washer systems utilizing:

• General Pump TSS1511 pump applications
• 24 mm solid shaft drive systems
• Belt-drive pressure washers
• Gear-drive pressure washers
• Commercial pressure washers
• Industrial pressure washers
• Equipment repair and replacement projects
• OEM equipment installations

Always verify shaft size, drive configuration, mounting dimensions, and pressure/flow requirements before installation.

Function of the Pump Made Ready Assembly

The TSS1511-VRT3-310EZ assembly helps:

• Deliver up to 4.0 GPM of water flow
• Produce operating pressures up to 3,500 PSI
• Regulate system pressure through the integrated VRT3-310EZ unloader
• Protect the pump during bypass with the thermal relief valve
• Reduce installation time with a factory-configured assembly
• Provide reliable, high-performance cleaning for demanding commercial applications

The low-speed 1,450 RPM design helps minimize wear while improving pump longevity and operating efficiency.

Common Signs Replacement Is Needed

Replace the pump assembly if you notice:

• Low operating pressure
• Reduced water flow
• Excessive pump noise
• External water or oil leaks
• Pump overheating
• Unloader valve failure
• Cracked or damaged pump housing
• Excessive internal wear
• Thermal relief valve malfunction

Replacing the complete pump assembly restores pressure washer performance while minimizing equipment downtime.

Installation & Service Notes

• Shut down the pressure washer and relieve all system pressure.
• Verify compatibility with the drive system, shaft size, horsepower, and mounting configuration.
• Install the pump according to the manufacturer's specifications.
• Connect the water inlet, high-pressure outlet, and required plumbing.
• Verify the VRT3-310EZ unloader and thermal relief valve are properly installed.
• Prime the pump with water before startup.
• Inspect the system for leaks and verify proper operating pressure after installation.

Important: Never operate the pump without an adequate water supply. Running the pump dry or allowing prolonged bypass operation without a functioning thermal relief valve can significantly reduce pump service life.

Maintenance Recommendations

• Inspect the pump regularly for leaks and abnormal operating noise.
• Check pump oil level and service according to General Pump maintenance recommendations.
• Verify proper operation of the VRT3-310EZ unloader valve.
• Inspect the thermal relief valve periodically for proper function.
• Flush the system after use when pumping dirty or corrosive water.
• Use only genuine OEM General Pump replacement parts and accessories to maintain maximum performance, reliability, and long service life.