Case 721G Stage IV, Operator'S Manual

Page: 54 / 522

2 - SAFETY INFORMATION
Vibration levels
The level of vibrations transmitted to the operator depends mainly upon the conditions of the ground on which
operations take place, the mode of operation of the machine and its equipment. Thus, the exposure to vibrations
can be considerably reduced when the following recommendations are complied with:
• Use equipment compatible with the machine and the type of work to be done.
• Adjust and lock the seat in the correct position. Also inspect regularly the suspensions of the seat, performing the
adjustments and repairs as required.
• Perform regularly the current maintenance operations of the machine at the prescribed intervals.
• Operate the equipment in a uniform manner, preventing, as far as possible, sharp movements or excessive loads.
• When traveling, avoid, as far as possible, particularly rough terrain or the impact against possible obstacles.
• This machine is equipped with an operator seat, which meets the criteria of
ISO 7096:2000 representing vertical
vibration input under severe but typical operating conditions. This seat has been tested with the input spectral class
EM 3-9, and its transmissibility factor is within the foreseen values. This ensures that the exposure of the operators
body to vibrations comply with the protection requisites for the protection against vibrations when the machine
operates as required by the operational scopes, in accordance with the prescriptions of this manual. The effective
value of the acceleration issued by the machine to which the arms of the operator are subjected does not exceed
2,5 m/s² . The effective value of the acceleration issued by the machine to which the body is subjected does not
exceed 0,5 m/s² . These results have been achieved using an accelerometer during load and unload operations.
NOTE: whole-body emission value is determined under particular operating and terrain conditions and is therefore not
representative for the various conditions in accordance with the intended use of the machine. Consequently this single
whole-body vibration emission value is not intended to determine the whole-body vibration exposure as required by
European Directive
2002/44/EC . For this purpose it is recommend to carry out real working condition measurement.
If not feasible, use of below reported information on ISO/TR 25398:2006 (*) is suggested.
Average
Standard deviation (s)
Typical operating condition
1,4*aw ,
eqx m/s²
1,4*aw ,
eqy m/s²
aw ,
eqz m/s²
1,4*Sx m/s² 1,4*Sy m/s² Sz m/s²
Load and carry motion
0,84 0,81 0,52 0,23 0,20 0,14
Mining application
1,27 0,97 0,81 0,31 0,31 0,47
Transfer movement
076 0,91 0,49 0,35 0,35 0,17
V-shape motion 0,99 0,54 0,54 0,32 0,32 0,14
(*) ISO/TR 25398:2006 Mechanical vibration - Guideline for the assessment of exposure to whole-body vibration of
ride on operated earth moving machines - Using harmonized data measured by international institutes, organizations
and manufacturers.
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