Swivelling drives

Swivelling drives are coaxial planetary gearboxes with two to four planetary stages, which drive large diameter bearings or gear rings via an output pinion. Swivelling drives are made with short or long output shafts, depending on the installation situation . The one-piece, case hardened and ground output shaft withstands the highest loads and, if required, can be fitted with profile-corrected gearing.

Swivelling drives are used in swivelling mechanisms in excavators and have a very robust design due to the highly dynamic loads. As a rule, the mostly two-stage gearboxes are driven hydraulically.

Liebherr swivelling drives are always designed for the specific requirements. The types in the table below give an idea of the range of options. Output torques, gear ratios and dimensions are available in a wide range of additional specifications and can be adjusted at any time.

SAT 275
Output torque [Nm]
10,000
Gear transmission ratio
36
Gear module of output pinion
10
Drive
Hydraulic motor
Gear brake
with integrated brake
Weight [kg]
200
The SAT 275 with a short output shaft is a relatively new design, which is ideally suited for the installation conditions of a crawler excavator of the latest generation.
SAT 325
Output torque [Nm]
18,000
Gear transmission ratio
36
Gear module of output pinion
14
Drive
Hydraulic motor
Gear brake
with integrated brake
Weight [kg]
320
The SAT 325 with a long output shaft is an example of the majority of swivelling drives manufactured by Liebherr and is used in a wide range of hydraulic and material excavators.
SAT 700
Output torque [Nm]
63,000
Gear transmission ratio
40
Gear module of output pinion
9-24
Drive
Hydraulic motor
Gear brake
with integrated brake
Weight [kg]
2,000
The SAT 700 is one of the largest swivelling drives offered by Liebherr. It is operating in a mining excavator.