Hydraulic Motors

Orbital (Gerotor) Motors

Compact low-speed, high-torque motors from 8 to 990 cm³/rev

Orbital motors use an internal gerotor (cycloidal) gear set to deliver high torque at low speed from a small, light housing. The range covers mini motors from 8.2 cm³/rev, shaft-valve motors for general mobile duty and disc-valve motors up to 990 cm³/rev for continuous pressures up to 20 MPa. Flanges, shafts, port threads and paint are selected per order, including wheel-motor and built-in-brake versions.

Typical specifications

Displacement: 8.2 – 990 cm³/rev
Max. torque: 11 – 2,015 N·m continuous; up to 2,280 N·m intermittent, 2,470 N·m peak
Pressure drop (continuous / peak): 7 – 20 MPa continuous; up to 28 MPa peak (size-dependent)
Speed: approx. 8 – 1,950 r/min continuous (size-dependent); up to 2,450 r/min intermittent on mini sizes
Max. output power: up to 47 kW continuous / 56 kW intermittent
Weight: 1.9 – 38.6 kg

Ranges across the product family. Exact figures depend on the model.

Options

Shaft-valve (spool) and disc-valve designs
Mini series 8–50 cm³/rev and compact short-housing series
2-hole oval, 4-hole square and wheel-hub mounting flanges
Shafts: Ø25 mm keyed, 1" keyed, 1" SAE 6B spline, Ø28.56 mm tapered, Ø32 mm keyed
Ports: G1/2, M22×1.5, 7/8-14 UNF O-ring, 1/2-14 NPTF; side or rear port positions
Built-in parking brake; high-radial-load and no-external-drain options
Finish: blue, black, silver-grey or unpainted