1 Rice, the primary cereal crop grown in East Asia, is particularly suited to the warm, wet growing season. ( 2 Rice is best grown in flooded fields, or paddies.) Since rice produces a much higher yield per acre than does a crop such as wheat, it can support a much greater population per acre than does wheat.
Hydraulic Motor Circuits. These are partial circuits, illustrating some of the ways hydraulic motors can be connected. and controlled. Each circuit is condensed to its simplest form to illustrate one basic idea. These circuits can be combined with other hydraulic circuitry to make up a complete working. circuit. Parallel Motors.
In some systems, air can enter the pump through its shaft seal. Check the condition of the pump shaft seal and if it is leaking, replace it. Cavitation occurs when the volume of fluid demanded by any part of a hydraulic circuit exceeds the volume of fluid being supplied. This causes the absolute pressure in that part of the circuit to fall below the vapor pressure of the hydraulic fluid. This results in the formation of vapor cavities within the fluid, which implode when compressed, causing a characteristic knocking noise.