A heavy-duty roller pump built for agricultural and commercial spraying applications where corrosive chemicals, herbicides, and fertilizers demand more than standard cast-iron or polypropylene construction. The R660SS moves up to 19.6 GPM at a maximum 150 PSI with a counter-clockwise (CCW) shaft rotation -- ready to pair with your existing PTO or engine-driven sprayer setup.
The Remco RollMax R660SS is a 6-roller positive-displacement roller pump designed to handle the rigors of field spraying season after season. Where standard roller pumps use nylon or rubber rollers that degrade on contact with aggressive chemicals, the R660SS uses stainless steel rollers and stainless steel housing components that resist corrosion from fertilizers, herbicides, pesticides, and other agricultural chemicals.
The 5/8" keyed shaft and 3/4" FNPT inlet and outlet ports are sized for high-volume trailer or skid sprayer rigs. Counter-clockwise rotation matches a wide range of gas engine and tractor PTO configurations -- verify your drive source rotation before ordering.
High-volume output supports large boom setups, multiple nozzle banks, and faster tank turnover in the field.
Adequate pressure for standard agricultural boom sprayers, spot sprayers, and nurse tank transfer applications.
Corrosion-resistant rollers extend pump life when running herbicides, fertilizers, and other aggressive chemical mixes.
Counter-clockwise rotation matches many gas engine and PTO drive setups. Confirm your drive direction before mounting.
Standard nylon rollers swell, crack, or dissolve when exposed to concentrated herbicides and liquid fertilizers. Stainless steel rollers hold their dimensional tolerance across chemical exposure and temperature variation, which keeps volumetric efficiency consistent over the life of the pump. The result is predictable output per revolution -- critical for accurate application rates.
Roller pumps are positive-displacement pumps: each revolution moves a fixed volume of liquid regardless of back pressure (up to the rated maximum). This makes them well-suited for sprayer applications where consistent flow per nozzle is required. Unlike centrifugal pumps, roller pumps are self-priming and can lift fluid from a tank below the pump inlet -- typically up to about 10 feet of lift in good condition.
Flow rate decreases as pressure increases. The 19.6 GPM rating is the open-flow (near-zero pressure) figure; expect lower actual output at working nozzle pressures. At typical boom pressures of 30-60 PSI, actual flow will be meaningfully lower than peak open-flow -- this is normal for all roller pump designs and should be accounted for when sizing your system.
Roller pump output is directly proportional to shaft RPM. The 19.6 GPM figure is measured at a specific drive speed (typically 540 RPM for PTO-rated pumps or a published engine RPM for direct-drive). Running the pump faster increases flow and pressure; running it slower reduces both. Match your drive speed to your target output range -- do not exceed the pump's maximum rated RPM to avoid premature roller and housing wear.
Stainless steel rollers and housing components provide excellent resistance to most agricultural chemicals, but the pump also contains other wetted materials including seals and O-rings (typically EPDM or Buna-N depending on configuration). Always verify that ALL wetted materials are compatible with the specific chemical concentrate you intend to run. Highly acidic or solvent-based products may still attack non-stainless components. Flush the pump thoroughly with clean water after each use to extend service life.