Description of the vehicle
Brief description of the vehicle 5.2
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[en] | 05/2019 | 1000408123 | 4080T Basic Line | Operator’s Manual
5.2.4
Cooling system
In the engine compartment, there is a combined water/hydraulic oil cooler
that cools the diesel engine and hydraulic oil. The radiator fan is mechan-
ically driven by the diesel engine via V-belts.
Control lights and control displays in the instrument panel of the vehicle
ensure that the engine and hydraulic oil temperature can be constantly
monitored.
5.2.5
Hydraulic system
The hydraulic system is equipped with control units, pressure relief
valves, filters and a radiator.
Depending on the vehicle equipment, plug-in couplings are fitted at the
front and rear of the vehicle for connecting hydraulically operated attach-
ments.
The vehicle has two hydraulic systems that are fed from a hydraulic oil
tank:
• Hydrostatic drive system
• Steering hydraulics and working hydraulics
Pipe rupture safety devices on the loader unit
The vehicle can be equipped as standard or as an option with pipe rup-
ture protection on the hydraulic cylinders of the loader unit. Pipe rupture
safety devices prevent an abrupt and unintentional lowering of the loader
unit in the event of a hydraulic line or hydraulic hose bursting.
The pipe rupture safety devices consist of lowering brake valves. De-
pending on the equipment of the vehicle, the lowering brake valves can
be bypassed by means of a switch in the cab (lowering brake bypass).
This is necessary for functions such as floating position and loader unit
stabilizer.
Hydrostatic drive system
The diesel engine permanently drives a variable displacement pump, the
oil flow of which is sent to a variable displacement engine flanged on the
transfer gearbox. The force of the displacement engine is transmitted to
the rear axle via the transfer gearbox, and to the front axle via the drive
shaft.
Adjustment is automatic and continuous, but depends on engine speed
and load. The travel speed is aligned with the speed of the engine and
the load of the vehicle.
Depending on the load of the vehicle, the variable displacement pump is
automatically regulated back so that the most favorable torque is always
maintained. The higher the load on the vehicle (for example during load-
ing work or uphill vehicle travel), the more the achieved maximum speed
is reduced. This type of vehicle regulation makes the best possible use of
the entire power range.
By actuating the brake/inching pedal (inching = deceleration; left foot
pedal), the control can also be influenced. When the inching function of
the brake/inching pedal is actuated, the vehicle brakes in fine doses to a
standstill, regardless of the engine speed. This control provides the work-
ing hydraulics with full engine power when the accelerator pedal and
brake/inching pedal are actuated simultaneously.
5
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