1. Hydraulic Piping (1) Choose the tubing according to the pressure and the occasion of use. The tubing should have sufficient strength. The inner wall should be smooth and clean. No sand, no rust and no scale. For long-term storage pipes, Wash thoroughly, wash, and inspect. (2) When sawing the pipe with a saw, the non-perpendicularity of the cross-section and the axial direction shall be ± 0.5 °. The sharp edges shall be blunt and clear of the iron filings. The ellipticity of the cross-section of the bent pipe shall be 10%. When its outer diameter (3) installation of pipelines is required, the shortest lines, turn as little as possible, the highest part of the pipeline should be set exhaust, in order to start deflating. (4) Install the rubber tube should avoid sharp turns, the bending radius r ≥ (9 ~ l0) d (d hose diameter). Do not bend near the root of the joint, requiring the hose joint to begin bending at a distance l ≥ 6d. Hose work should not be reversed. (5) suction pipe shall not leak, nor should the resistance is too large, to prevent gas or oil suction cavitation. (6) The oil return pipe mouth shall extend below the fuel tank oil surface to prevent the bubbles from splashing. The relief valve return pipe can not be directly connected with the pump inlet, must pass the fuel tank, otherwise the oil temperature will be too high. (7) All pipe installation procedures are to be carried out in two stages. First, the test assembly shall be carried out. The pipe joints and flanges shall be spot-welded at appropriate positions. After all the pipe tests are qualified, they are removed and pickled before being formally installed. 2. Other hydraulic components (1) All hydraulic components should be pressure and seal test, after passing before installation. Before installation should be a variety of automatic control instrument calibration, to avoid mistakes. (2) When installing various control valves, pay attention to the orientation of inlet and return ports. Screws can not be over-tightened with flanges when installing valve parts, but tightening can sometimes cause poor sealing. (3) Install the hydraulic cylinder should be solid and reliable, in order to prevent the influence of thermal expansion, when the stroke is large and the temperature is high, one end of the cylinder must be kept floating. Hydraulic cylinder seal Do not be too tight, especially the u-shaped ring, so as to avoid excessive resistance. (4) hydraulic pump drive shaft and motor drive shaft misalignment should be less than 0.lmm, the general use of flexible coupling connection, not allowed to directly drive the shaft with a tape to prevent the pump shaft by the radial force Large, affecting the normal operation of the pump. (5) When installing the hydraulic pump its direction of rotation and inlet and outlet should meet the technical requirements. (6) various types of hydraulic pump suction height, generally less than 0.5mm.
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