Danfoss TMK FL 250 11008905 orbital hydraulic motor

Danfoss TMK FL 250, part number 11008905, is a fixed-displacement orbital hydraulic motor for low-speed, high-torque drives. The factory geometric displacement is 252.2 cm³/rev. Nominal size 250 identifies the series size and differs from the exact geometric displacement.

The factory execution uses a tapered keyed shaft: Dia. 1 1/2 inch, 1:8 SAE J501, 1 - 20 UNEF-2A thread in shaft end. Refer to the original shaft-end or wheel-hub drawing for spline, key, threads and tolerances.

Mounting type: 4 Bolt - Square; locating pilot 140.0 mm; bolt circle 161.9 mm. Main port connection: 1 1/16-12 UN-2B SAE O-Ring port. Drain connection: 7/16-20 UNF-2B O-Ring port. Port arrangement: Sideport - staggered. The motor uses Geroler gearing and disc valve with valve drive. Factory check-valve provision: No.

This execution includes a hydraulically released parking brake with low release pressure and a 7/16-20 UNF-2B SAE O-Ring Port release connection. The brake is for holding duty. Observe the original release-pressure, holding-torque and drain limits.

Select the operating point from the size-specific hydraulic data and performance diagram. Continuous, intermittent and peak limits represent separate operating duties and must not be combined into one maximum-duty point. Differential pressure differs from maximum inlet pressure. Observe the applicable shaft loading, shaft-seal pressure, return pressure and drain requirements.

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