One of the highlights at Bauer booth during bauma 2025 was the eRG 21 T hybrid pile driver from RTG Rammtechnik. The machine’s drive system combines the power of a 430 kW diesel engine with the precision of an electric motor delivering up to 88 kW of additional power (standard power supply: 125 A / 400 V).
This hybrid technology ensures a constant high level of efficiency, even under strict emission regulations. Thanks to the support of the electric motor, the diesel engine operates with less power, which not only reduces noise significantly but also minimises fuel consumption. As a result, CO2 emissions can be cut by up to 68%.
The system seamlessly adjusts between diesel and electric power based on demand, optimising performance for various applications. When lower power is required, the machine can even operate in fully electro-hydraulic mode. Meanwhile, full power is available for demanding piling tasks.
The standard equipment for the eRG 21 T hybrid includes the Bauer comfort operator cabin and a modern touchscreen with B-Tronic control. Integrated power management optimises the use of the hybrid drive. The temperature-regulated fan control system with fully automatic operation has been specially developed for vibrator operation. Additionally, the machines features a basic remote control as well as retractable side flaps for automatic noise protection.
A variety of optional features allow customisation for specific requirements. An arctic kit or the extended arctic kit plus, for example, enable operation under extreme weather conditions. An optional second swivelling mechanism increases the swivel braking torque, improving machine control. The energy-efficient power (EEP) system with Eco Mode further helps reduce energy consumption. An extended remote control (operation) and automatic coupling system for the base machine (ACS I) and all attachments (ACS II) are also available.
The hybrid drive has already demonstrated its reliability with the eRG 19 T hybrid, the ‘smaller sister’ of the eRG 21 T hybrid. Last year, it was used successfully at the Friedrich-Krause-Ufer site in Berlin, Germany. During the special foundation engineering work for a new office and commercial building, the machine executed vibration driving precisely based on a grid pattern, laying the groundwork for an excavation pit with a stable sealing horizon.
All images: Bauer Group
