General Pump TSS1511 Triplex Pump – 4.0 GPM, 4,000 PSI, 24 mm Shaft

Part Number: 85.139.005B
Bare Pump Part #: 85.130.005
Pump Model: GP TSS1511
Pump Type: Triplex | Belt Drive | Gas / Electric Compatible

Professional Low-RPM Belt-Drive Pump for High-Pressure Applications

The General Pump TSS1511 Triplex Pump Assembly is a professional-grade, belt-drive triplex plunger pump engineered for high-pressure cleaning applications that require durability, smooth operation, and long service life. Producing 4.0 GPM at 4,000 PSI, this pump delivers strong cutting power with efficient water flow—ideal for industrial, commercial, and contractor-grade systems.

Manufactured by General Pump (GP), one of the most trusted names in the industry, the TSS1511 features a brass manifold, ceramic plungers, and a low-RPM 1,450 belt-drive design for cooler operation, reduced wear, and extended component life. Equipped with an external unloader, adjustable chemical injection, and a brass quick-connect discharge, this pump is built for demanding daily use. Backed by a 5-year warranty, it’s designed to perform reliably year after year.

Key Features

• High-Pressure Performance
  4,000 PSI delivers strong cutting power for heavy-duty cleaning tasks

• Efficient Water Flow
  4.0 GPM provides steady output for consistent coverage and rinsing

• Low-RPM Belt Drive (1,450 RPM)
  Runs cooler and quieter while extending seal, bearing, and plunger life

• Triplex Ceramic Plungers
  Smooth operation with superior heat and abrasion resistance

• Brass Manifold
  Excellent corrosion resistance and heat dissipation

• External Unloader (85.300.037)
  Precise pressure regulation with easier servicing and replacement

• Adjustable Soap Injector (85.400.000)
  Controlled detergent application for enhanced cleaning performance

• Gas or Electric Drive Compatible
  Designed for belt-drive systems powered by gas engines or electric motors

Specifications

Triplex Performance You Can Depend On

The triplex plunger design provides smoother, more efficient operation than axial pumps while significantly extending pump life. The ceramic plungers resist heat and abrasion, protecting seals and internal components during extended high-pressure operation.

With 4,000 PSI, the TSS1511 excels in applications requiring strong impact force, while 4.0 GPM maintains efficient water delivery for consistent results.

Built for Professional Durability

• Brass manifold for corrosion resistance and thermal stability

• Ceramic plungers for long seal life under high pressure

• 24 mm solid shaft for secure belt-drive compatibility

• 32-lb heavy-duty build for stability and long-term reliability

This rugged construction makes the TSS1511 well-suited for continuous-duty professional systems.

Operator-Focused Design

• External unloader allows precise pressure control and easy servicing

• Adjustable soap injector supports flexible detergent application

• Thermal relief valve protects the pump during bypass operation

• Brass quick-connect discharge ensures secure, leak-free hose connections

These features reduce downtime and improve safety during daily operation.

Low-RPM Advantage

Operating at 1,450 RPM, the TSS1511 runs cooler and quieter than high-speed direct-drive pumps. Reduced heat and vibration significantly extend component life, making this pump an excellent long-term investment for demanding applications.

The pump also supports inlet water temperatures up to 165°F (74°C), making it suitable for hot-water systems where enhanced cleaning performance is required.

Maintenance & Service

• Requires 37 oz of 30W non-detergent oil

• Simple oil checks and changes

• Thermal relief valve provides automatic overheating protection

• Designed for easy servicing and long service life

With routine maintenance, the TSS1511 delivers reliable performance for years.

Common Applications

• Industrial Cleaning: Degreasing and heavy-duty wash-downs

• Fleet Washing: Trucks, trailers, buses, and service vehicles

• Car Wash Systems: High-pressure belt-drive installations

• Agriculture: Tractors, combines, and farm equipment

• Commercial Property Maintenance: Parking lots, sidewalks, siding

• Surface Preparation: Paint, coating, mold, and grime removal