Wheel Loaders

Working Hydraulics - The Ups and Downs of a Wheel Loader

Basic system for wheel loaders (open-center working hydraulics)

The so-called open-center working hydraulics are perfect for the less expensive wheel loaders. This system is based around gear pumps AZP together with the control block SM 12. The advantages of this system are:

its simple layout
compact design
the ease of adding functions later-on

The comfort version:

Three central elements make up this user-friendly system: Pump, valves and controls. It's knowing how these different areas interact with one another that determines the system's practicality.

The A10V0 variable displacement pump offers a large number of different methods for optimizing energy consumption - such as regulation of pressure and flow combined with higher-level power regulation or electro-proportional swivelangle adjustment. This pump is directly attached to the travel pumps or the diesel engine's power take-off. The SX and M6 valve systems are the basic units of the high-quality LUDV flow sharing technology for the various different types of wheel loaders. These two systems also offer a number of other advantages:

the zero-leak seat valves prevent the bucket from lowering in an uncontrolled manner
the integrated priority control for the steering reduces the amount of pipework
a special design prevents cavitation when lowering and tipping out the bucket

Everything under control with our joysticks

The hydraulic and electronic joysticks THF and MHVEJ with the ergonomic EC 2000+ and EC 4000 handles make everyday use of the loader easier and more effective: Low actuation forces and proportional control behavior permit sensitive control, while various characteristic curves ensure optimal matching to the working hydraulics. Lock-in positions and reference positions for identifying working points simplify the task of the operator. The handles offer a wide selection of switches, rollers, rockers and buttons.

For control blocks with no integrated control oil supply there is the compact control oil supply unit MHSTE for serving up to three independent high-pressure circuits. This offers integral pressure limitation valves and shuttle valves as well as various safety functions.