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General PumpSKU: TSP1821

TSP1821 Pressure Washer Pump-General Pump HD Belt Drive 5.5 GPM - 5100 PSI Max

$1,149.00

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Overview

The TSP1821 is a General Pump heavy-duty belt-drive pressure washer pump rated 5.5 GPM at 1450 RPM with a 5100 PSI maximum discharge pressure. Turning at a slow 1450 RPM, it's built for continuous-duty work: a forged brass manifold backed by General Pump's lifetime warranty, a large-capacity anodized aluminum oil-bath crankcase, over-sized connecting rods, tapered roller bearings, and solid ceramic plungers with lubricated packings. Ports are 1/2-inch inlet and 3/8-inch discharge on a .945 in. (24 mm) shaft, with a 165°F maximum fluid temperature. It's the right replacement for belt-drive machines where long pump life matters. Note: every installation requires a primary regulating device (unloader) plus a secondary safety relief valve.

What's included

  • Heavy-duty continuous-use belt-drive pump running at 1450 RPM
  • Forged brass manifold with exclusive lifetime warranty
  • Large-capacity anodized aluminum oil-bath crankcase
  • Over-sized HD connecting rods for maximum life
  • Heavy-duty tapered roller bearings minimize friction
  • Solid ceramic plungers with lubricated packings
  • Unitized stainless steel inlet and discharge valves
  • Easy-view oil sight gauge on the side of the pump

Specifications

GPM
5.5 @ 1450 RPM
Max Discharge Pressure
5100 PSI
Max Inlet Pressure
125 PSI
Max Inlet Vacuum
9 ft. water (7.9 in. Hg)
Max Fluid Temperature
165°F
Plunger Bore
.787 in. / 20 mm
Plunger Stroke
.630 in. / 16 mm
Crankcase Oil Capacity
40.6 oz.
Inlet Port Thread
1/2 in.
Discharge Port Thread
3/8 in.
Shaft Diameter
.945 in. / 24 mm

Frequently asked questions

The TSP1821 fits belt-drive machines that can accept a .945 in. (24 mm) pump shaft and run the pump at 1450 RPM. Check your shaft diameter, pulley setup, and plumbing — it uses a 1/2-inch inlet port and a 3/8-inch discharge port.

Yes — this pump requires both a primary pressure regulating device (an unloader or regulator) and a secondary pressure safety relief device such as a pop-off valve. Running the pump without both can damage the pump and system components and risks personal injury.

The forged brass manifold carries General Pump's exclusive lifetime warranty. The rest of the pump is built for continuous duty, with an oil-bath crankcase, tapered roller bearings, and solid ceramic plungers.

The TSP1821 is rated for a maximum fluid temperature of 165°F. Keep incoming water at or below that limit to protect the plungers and packings; it is not rated for steam or higher-temperature service.

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