Hydraulic System - EUROMACH R 1253 Forester Mode D'emploi

Hydraulic system

The excavator is equipped with a L.U.D.V. system that permits the complete use of the power
generated by the Diesel engine.
Each individual function receives a predefined quantity of hydraulic oil, when two or more
functions are activated at the same time, the oil flow generated by the pump is divided
proportionally into the various functions on the base of the predefined oil quantities. The final
result is that all functions are running at the same time even if they demand different
pressures, on the contrary of the traditional hydraulic system.
The rotation function has the priority, therefore the rotation speeds stay constant whatever
other function is going to be activated. The main pump is a load sensing pump and it varies
the displacement and therefore the oil flow on the base of the quantity of oil that the function
is requiring. This system produces a much lesser oil heating than the traditional hydraulic
system, where the oil is circulating even when not utilised.
The total capacity of the system is 470 lit/min, that are subdivided as follows:
Main pump
Variable displacement axial piston pump with constant power governor:
Maximum capacity
Maximum absorbed power (with one activated function) 65 KW
Motion pump
Variable displacement axial piston pump:
Maximum capacity
Maximum absorbed power
Secondary pump
The secondary pump is feeding the fan drive of the machine, this pump is a gear pump with fix
displacement.
Maximum capacity
Maximum absorbed power
Main control valve
1 hydraulic control valve with maximum pressure valve located at the inlet and with anti-shock
and anti-cavitation valves on all sections. The control valves control the boom cylinders,
rotation and motion functions. The oil comes from the main pump.
Secondary control valve
1 electrically actuated control valve, that receives the oil from the secondary pump, controls
the under carriage functions.
Boom cylinders
All the boom cylinders are of double effect type and are equipped with end stroke shock
absorber in both directions. The cylinders of the inner and outer boom can be equipped with
locking valves (Standard ISO 10567).
Under carriage cylinders
All the under carriage cylinders are of the double effect type and are equipped with locking
valves.
Operator's cab
The cabin is made out of steel and is installed on shock absorbers.
The cabin is safe against overturning and is verified with following standards:
•
ROPS structure following the ISO 3471 standards
•
FOPS structure of 1st level following ISO 3449 standards
The cabin can be tilted hydraulically for maintenance purposes.
The windows, in tempered and colored glass, are of big dimensions and permit full visibility on
the working area. The windows have the following openings:
Edizione 01/16 – Revisione 00
Technical Specifications – R1253
R1253
290 lit/min. (76.62 gall/min)
155 lit/min. (40.95 gall/min)
81 KW
28 lit/min. (7 gall/min)
10.7 KW
Feb 16
UT
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