The efficiency of steering pump of port tractor lost very heavy when engine was in high speed.

港口牵引车液压系统中的转向泵在发动机高速状态时的能量损失较大。

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Modifications of engine and tractor are discussed and experimental data presented in this paper.

本文就发动机及拖拉机的改装等问题进行了探讨，并对试验结果进行了分析。

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The mathematical models of tractor set, engine, clutch and the moment of tractor set resistance during the tractor starting have been set up.

建立了拖拉机起步过程中机组、发动机、离合器和机组阻力矩的数学模型。

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The technology isn't new-a patent for a hydrogen internal combustion engine was issued in 1928, and a 20hp fuel-cell tractor was demonstrated in the late 1950s.

FORBES: Magazine Article

During the hearing the HSE said the tractor's starter motor had been faulty for at least two months and staff had been starting the engine by using a screwdriver or spanner to short the connection.

BBC: Leicester