Danfoss TMT 250 151Z3020 orbital hydraulic motor

Danfoss TMT 250, part number 151Z3020, is a fixed-displacement orbital hydraulic motor for low-speed, high-torque drives. The exact geometric displacement is 251.8 cm³/rev. The nominal size 250 is a series designation and should not be substituted for the geometric displacement.

The factory execution uses a splined shaft: Dia. 1 1/2 inch, 17T, M12 x 1.75-6H thread in shaft end. Mounting type: 4 Bolt - Square. The locating pilot is 160.0 mm and the bolt circle is 200.0 mm. Refer to the applicable original manufacturer drawing for tolerances, rear mounting interfaces and mating-part dimensions.

Main port connection: 3/4" BSP. Drain connection: 1/4" BSP. Port arrangement: Sideport - staggered. The factory specifies Geroler gearing, disc valve with valve drive and NBR - Standard shaft sealing. Check-valve provision: No.

Use the size-specific hydraulic data and applicable shaft-load and shaft-seal limits to select the operating point. Continuous, intermittent and peak limits describe separate duties; they are not a single combined maximum-duty point. Differential pressure is distinct from maximum inlet pressure. Drain routing and return pressure must follow the original manufacturer instructions.

Representative Danfoss TMT series photograph supplied on this article’s manufacturer page; shaft, ports, mounting, brake arrangement and displacement may differ. Use the technical PDF for exact specifications.