Comparing operational characteristics of 540 rpm and 750 rpm PTO in tractors through laboratory tests

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The objective of this study was to determine the differences in operational characteristics between standard power take-off (PTO) 540 rpm and 750 rpm operations in tractors. Loads were applied to three tractors (JD 5625, NH TD85, MF 3085) with similar technical specifications, by means of a PTO dynamometer (Eddy-current) under stable conditions. Measurements were done to determine tractor PTO torque, engine fuel consumption, specific fuel consumption, and engine exhaust gas and cooling water temperatures. The torque values measured for 540 and 750 rpm at load steps (5-50 kW) were 88 Nm-888 Nm and 63 Nm-638 Nm, respectively. Data analysis showed that the fuel consumption in 750 rpm increased by 1.00-2.80%, 7.56-12.63%, and 7.59-14.64%, respectively, for JD 5625, MF 3085, and NH TD85. Specific fuel consumption decreased with power increase in both PTO operations in each tractor. Exhaust gas temperatures varied between 237-562 °C and 229-562 °C, respectively for 540 and 750 rpm in all tractors. The cooling water temperatures of the engines varied between 79-87 °C, 63-77 °C and 66-72 °C, respectively, for the JD 5625, MF 3085, and NH TD85 tractors. Findings showed that the 750 rpm PTO operation had lower pto torque, higher fuel consumption and specific fuel consumption values than those of the 540 rpm pto operation for the all tested tractors. However, 750 rpm operation may be an alternative to 540 rpm operation for some PTO driven machines.

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Tractor , 540 rpm , 750 rpm , PTO , performance

Anadolu Journal Of Agricultural Sciences

174

Anadolu Journal Of Agricultural Sciences