Penelitian ini bertujuan untuk membuat biodiesel dari minyak jelantah yang diperoleh dari produsen gorengan dengan dua tahapan esterifikasi dan transesterifikasi, hasil akhir dari biodiesel kemudian di uji melalui 3 karakteristik sederhana yaitu densitas, viskositas dan Asam Lemak Bebas Produk biodiesel, Densitas hari pertama 882 kg/m3,hari ke 15 adalah 889 kg/m3 dan hari ke 30 adalah 889 kg/m3. Viskositas hari pertama adalah 5.43 cst, hari ke 15 adalah 5.72 cst, dan hari ke 30 adalah 5.95 cst, FFA hari pertama 0.28%,hari ke 15 adalah 0.31% dan hari ke 30 adalah 0.40%.

Biomechanics is performed to minimize fatigue and risk of muscle bone loss, in repetitive working conditions. So in the placement and operation of the controller must be ergonomic so that the operation in the most efficient besides, to get the inclination (slope). The hand position angle relative to the horizontal so that the maximal force can be applied, then the condition must meet the condition of each muscle. The objective of the study is to apply ergonomic biomechanics to harvest management of combined harverter machines. The data collection is done directly to the user of combined harverter machine to know the working condition, the collection / measurement, the dimension of the human body. Further data weight and height of the operator will be processed to analyze the posture at work. The direct measurements of muscle strength before redesign of the magnitude of the moment in each segment of the operator body are as follows: The moment of the forearm, the operator A = 11.366 Nm, operator B = 13.769 Nm, operator C = 11.287 Nm and operator D = 11,675 Nm and the magnitude of the moment at the upper arm, on the operator that is operator A = 22.610 N.m, operator B = 27.004 N.m, operator C = 19.845 N.m and operator D = 21.429 N.m.3. The magnitude of the moment on the back, on the operator before redesign the operator A = 69.029 N.m, operator B = 76.587 N.m, operator C = 66.334 N.m and operator D = 70.127 N.m.