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SEBU7858-03 31
Safety Section
Sound Information and Vibration Information
•
Jobsiteorgani
zation, preparation, environment,
weather, and material
•
Machine type,
quality of the seat, quality of the
suspension system, attachments, and condition of
the equipment
It is not possible to get precise vibration levels for
this machine. The expected vibration levels can be
estimated w
ith the information in Table 1 in order
to calculate the daily vibration exposure. A simple
evaluation of the machine application can be used.
Estimate the vibration levels for the three vibration
directions. For typical operating conditions, use the
average vi
bration levels as the estimated level. With
an experienced operator and smooth t errain, subtract
the Scenario Factors from the average vibration level
in order to
obtain the estimated vibration level. For
aggressive operations and severe terrain, add the
Scenario Factors to the average vibration level in
order to o
btain the estimated vibration level.
Note: All vibration levels are in meter per second
squared.
Table 1
“ISO Reference Table A - Equivalent vibration levels of whole body vibration emission for earthmoving equipment.”
Vibration Levels Scenario Factors
Machine Family Machine Type
Typical Operating
Activity
X
axis
Y
axis
Z
axis
X
axis
Y
axis
Z
axis
Scraper Wheel Scraper
work cycle 1,05 1,18 1,12 0,34 0,40 0,42
Note: Refer to “ISO/TR 25398 Mechanical Vibration -
Guideline for the assessment of exposure to whole
body vibration of ride on operated earthmoving
machines” for more information about vibration.
This publication uses data that is measured
by international institutes, organizations and
manufacturers. This document provides information
about the whole body exposure of operators of
earthmoving equipment. Refer to Operation and
Maintenance Manual, SEBU8257, “The European
Union Physical Agents (Vibration) Directive
2002/44/EC” for more information about machine
vibration levels.
The Caterpillar suspension seat meets the criteria of
“ISO 7096”. This represents vertical vibration level
under severe operating conditions. This seat is tested
with the input “spectral class EM2”. The seat has a
transmissibility factor of “SEAT<1.0”.
The whole body vibration level of the machine varies.
There is a range of values. The low value is 0.5
meter per second squared. The machine meets the
short term level for the design of the seat in “ISO
7096”. The value is 1.34 meter per second squared
for this machine.
Guidelines for Reducing Vibration Levels on
Earthmoving Equipment
Properly adjust machines. Properly maintain
machines. Operate machines smoothly. Maintain the
conditions of the terrain. The following guidelines can
help reduce the whole body vibration level:
1. Use the right type and size of machine, equipment,
and attachments.
2. Maintain machines according to the manufacturer's
recommendations.
a. Tire pressures
b. Brake and steering systems
c. Controls, hydraulic system and linkages
3. Keep the terrain in good condition.
a. Remove any large rocks or obstacles.
b. Fill any ditches and holes.