FluiDyne hydraulic motors cover low-speed high-torque (LSHT) orbital and gerotor designs built by FluiDyne Fluid Power, the ISO 9001:2015 manufacturer in Fraser, Michigan that grew out of Western FluiDyne. The motor lineup spans the J, H, S, 211, 500, 2000, 4000, 6000, and 10,000 series with displacements from roughly 0.50 to 49 in³/rev, plus FM-series geroler motors (FM1, FM3, FM4, FM50, FM51) in the 80-500 cc range. Because FluiDyne builds these to be form-fit-function interchangeable with Parker, Char-Lynn, White, Ross, and TRW units, you can cross-reference an obsolete motor part number and get a current equivalent.
Match the motor to torque, speed, and shaft envelope. For wheel drives, augers, conveyors, and other low-speed high-torque duty, FluiDyne's orbital and gerotor and geroler torque motors deliver high starting torque from a compact gerotor element. Within that family, smaller-displacement J, H, and S series motors suit lighter rotary loads, while the 2000 through 10,000 series carry the larger displacements for heavy continuous torque. When a system pairs a motor with a closed or open-loop pump, confirm the circuit against FluiDyne's hydraulic pumps and piston-pump options so flow and pressure ratings line up across the drive.
The cross-reference is the core of this catalog. FluiDyne motors are engineered to interchange with Parker, Danfoss/Sauer, Eaton/Char-Lynn, White, Ross, and TRW motors by form, fit, and function, and they carry an 18-month warranty as standard. If an OEM motor is discontinued or the casting number no longer maps to a current part, send the displacement, shaft, mounting, and port data along with the legacy number and we will identify the equivalent FluiDyne unit. Request a cross-reference quote for any obsolete or hard-to-source hydraulic motor.
Yes. Every Fluidyne product we list is factory-new and genuine — not aftermarket or remanufactured. Item SKUs match the manufacturer part numbers, so you can verify any model directly against Fluidyne documentation.
Yes — Northern Hydraulics has supplied hydraulic equipment since 1963. Call (800) 823-4937 with your application details, or send a quote request with the model you are replacing and we will cross-reference it to the right Fluidyne part.
Yes. For multi-unit or recurring orders, use the Request a Quote button — volume pricing on Fluidyne equipment is quoted case by case, usually within one business day.