Personal safety
Warning
Protect yourself from injury. Use proper safety equipment including safety glasses at all times.
Hazardous material
Warning
Hydraulic fluid contains hazardous material. Avoid contact with hydraulic fluid.
Always dispose of used hydraulic fluid according to state and federal environmental regulations.
Design
Danfoss fixed displacement motor (TMM) is designed to convert an input of hydraulic power into an
output torque. It operates in the reverse manner of the pump.
The high pressure hydraulic fluid enters through the input port. The fluid pressure builds behind the
pistons causing them to move down the swash plate (the path of least resistance). As the piston returns
up the swashplate again, the fluid is allowed to exit through the exit port. The spinning pistons are
housed in a cylinder which is connected to the output shaft. The output torque can be applied to a
mechanical function.
The motors include a loop flushing feature that provides additional cooling and cleaning of fluid in the
working loop.
Cross-section view of TMM
Anti-cavitation valve
High pressure relief valve
Loop flushing relief valve
Loop flushing valve
Valve plate
Piston
Conical bearings
Output shaft
Fixed swashplate
Cylinder block
The System Circuit
The Basic Closed Circuit
Hydraulic lines connect the main ports of the pump to the main ports of the motor. Fluid flows in either
direction from the pump to the motor and back. Either of the hydraulic lines can be under high pressure.
In pumping mode the position of the pump swashplate determines which line is high pressure as well as
the direction of fluid flow.
Service Manual
TMM Transit Mixer Axial Piston Motor, Size 070/084/089
Introduction
8 L1211037 • Rev AC • Apr 2014
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