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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At the heart of the tractor is the electric motor, which drives the hydraulic pump that supplies power to the wheels. Both ac and DC powered motors are used in e-line tractors.

爬行器的核心是电机，其驱动液压泵为轮组提供动力，电缆爬行器可以使用AC或DC电机。

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Nearby, a decrepit tractor and an ancient pump stand idle, their engines cannibalised for spare parts.

ECONOMIST: Iraq

In ten minutes, the fire circled the house, and he climbed up to the belvedere to track its progress as it burned to the ditches surrounding his tract, taking out the pump house and a tractor shed, and incinerating his Dodge, which burned hot and high, killing most of the foliage of the live oak shading it.

NEWYORKER: Idols