RentSpray 700 Gas Piston Pump

RentSpray 700 Gas Piston Pump Parts

The RentSpray 700 Gas Piston Pump (Model 755-2020) is a rugged, professional-grade airless sprayer pump designed for high-performance applications. Powered by a gas engine, it provides reliable, consistent fluid delivery even in remote or difficult environments, ideal for contractors tackling large jobs, remote sites, or projects where electricity is not available.

Built for durability and serviceability, the 700 model features a slow-stroking hydraulic piston, which helps maximize the life of the fluid section by reducing wear on internal seals. Its pressure control system gives accurate regulation, allowing spray pressure from as low as 400 psi up to 3,600 psi (depending on setup) for flexibility across different coatings. 

Key Features

Slow-Stroking Hydraulic Piston: Reduces wear on internal components to extend pump life.

Wide Pressure Range: Precise control over pressure settings, capable of operating from ~400 psi up to 3,600 psi (depending on configuration).

Tool-Free Fluid Section Replacement: Swap out the fluid section in the field quickly, without special tools. 

Portable Design: 12-inch pneumatic tires make the unit easy to move around job sites. 

Cooling System: Radiator-style active cooling helps dissipate heat during long spray runs. 

Dual-Mode Valve: The PRIME/SPRAY valve allows safe switching between priming and spraying modes. 

Service-Friendly: Designed for maintenance, internal parts such as the piston, seals, and valves are accessible for repair and repacking.

Gas-Powered: No need for mains electricity, ideal for remote or mobile operations.

FAQ’s

1. What are the most common signs that the RentSpray 700 piston pump needs rebuilding?

If your  RentSpray 700 piston pump begins losing pressure, producing pulsations, or showing fluid leakage around the piston area, it’s usually a sign that the piston packings, O-rings, or valve seats are worn. These soft parts naturally degrade over time and require periodic rebuilding to maintain full performance.

2. Why is my RentSpray 700 not priming properly?

Poor priming is commonly caused by a blocked inlet filter, a worn inlet valve, or air entering the suction line. Check the hose connections for air leaks and make sure the inlet strainer is clean. If priming is still weak, your inlet valve assembly may need replacement.

3. How often should I replace the seals or packings in the RentSpray 700 Gas Piston Pump?

Packing wear depends on usage, coating type, and maintenance routines, but most contractors replace them after major projects or when they notice a performance drop-off. The RentSpray 700 is designed for quick, field-friendly fluid section replacement, so repacking can be done without special tools.

4. Why does my RentSpray 700 spray unevenly or produce a fluctuating fan pattern?

This usually occurs if the spray tip is worn, the pump is struggling to maintain pressure, or the outlet valve is sticking. Worn spray tips widen over time, changing the fan pattern. Also check for clogged filters or failing valve assemblies, which can cause unstable pressure output.

5. What should I check if my RentSpray 700 is leaking around the pump or hose fittings?

Leaks typically point to cracked hoses, worn O-rings, loose fittings, or damaged seals inside the fluid section. Inspect each connection, tighten fittings, and replace any old seals. If the leak is internal, the pump packings may be worn and require a rebuild kit.