TUBE 2256041 - Caterpillar

Table 1
"ISO Reference Table A - Equivalent vibration levels of whole body vibration emission for earthmoving equipment."    
Machine Type    Typical Operating Activity    Vibration Levels    Scenario Factors    
X axis Y axis    Z axis    X axis    Y axis    Z axis    
Wheel Loader     load and carry motion     0,84     0,81     0,52     0,23     0,20     0,14    
mining application (1) 1,27     0,97     0,81     0,47     0,31     0,47    
transfer (2) 0,76     0,91     0,49     0,33     0,35     0,17    
V-shape motion (3) 0,99     0,84     0,54     0,29     0,32     0,14    
( 1 ) Loading at the face
( 2 ) Travel at high speed on the job site or on public roads
( 3 ) Loading a truck in short cyclesNote: 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 Supplement , SEBU8257 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 EM3". 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 1.13 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:
Use the right type and size of machine, equipment, and attachments.
Maintain machines according to the manufacturer's recommendations.
Tire pressures
Brake and steering systems
Controls, hydraulic system and linkages
Keep the terrain in good condition.
Remove any large rocks or obstacles.
Fill any ditches and holes.
Provide machines and schedule time in order to maintain the conditions of the terrain.
Use a seat that meets "ISO 7096". Keep the seat maintained and adjusted.
Adjust the seat and suspension for the weight and the size of the operator.
Inspect and maintain the seat suspension and adjustment mechanisms.
Perform the following operations smoothly.
Steer
Brake
Accelerate.
Shift the gears.
Move the attachments smoothly.
Adjust the machine speed and the route in order to minimize the vibration level.
Drive around obstacles and rough terrain.
Slow down when it is necessary to go over rough terrain.
Minimize vibrations for a long work cycle or a long travel distance.
Use machines that are equipped with suspension systems.
Use the ride control system on wheel loaders.
If no ride control system is available, reduce speed in order to prevent bounce.
Haul the machines between workplaces.
Less operator comfort may be caused