In this paper, a power tiller vibration was investigated at handle position as well as seat position of a trailer pulled by\nthe power tiller. The experiments were conducted at five levels of engine speed, four levels of transmission gear ratio during\ntransportation, and in three directions. Then the weighted 1/3rd octave spectrum was calculated from the narrow band vibration\nacceleration signals. The amount of vibration damage on operator's body and allowable exposure limits were calculated based on\nISO standards. The results showed that the vibration increased with the engine speed increased for all the gear ratios and\ndirections. The magnitude of vibration was the greatest at vertical direction in all the experiments. The vibration allowable\nexposure time was in the range of 2.32 - 5.7 years at the power tiller handle for the different engine speeds and gear ratios. The\ntotal equivalent vibration, A (8), at the trailer seat was in the range of 0.5 to 0.87 m/s2 and it exceeded the allowable limits for the\nreduced comfort boundary, fatigue-decreased boundary and exposure limit for 8 hrs day-1. So, it is necessary to reduce the\nvibration transmitted to the operator�s hand and body by designing and developing adequate insulating systems.
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