In the maintenance manual hydraulic pump from the following to find the cause, and to improve the system: 1. Check the boom cylinder internal leakage situation. The easiest way is to raise the boom, to see whether there is a significant decline in freedom 2, if you disassemble the fuel tank to check the whereabouts of obvious, such as worn seals should be replaced. 3, check the control valve. First clean the safety valve, check valve wear, such as wear and tear should be replaced. 4. If there is still no change after installing safety valve, check valve spool manipulation wear SSD1 manual pump, the gap is generally limits the use of 0.06mm, badly worn should be replaced. 5, the measurement manual hydraulic pressure. If the pressure is low, then make adjustments, plus the pressure is still not up SBD14E manually adjust the pump, then a manual pump badly worn how to make safe and reasonable to use a hand pump? In order to complete our work in a manual hydraulic pump for use during the SYB-1 manual pump, usually require certain inspections, its use must not exceed 63MPa pressure job. Not free to mobilize the high and low pressure valve; when its work should be smooth shake the handle, not the impulse to make the oil phenomenon, so that the valves and lasting work; when their needs should be reduced slowly twisting the hand wheel, not cause decompression too fast; in addition to the manual hydraulic pressure hose needs related to a pressure test every six months for a manual pump, hose aging prevent accidents. Test pressure lower than 90MPa, which happened when raised leakage can not be used. According to the introduction to related articles, you can learn a manual pump is a manual control valve opening and closing drive hydraulic equipment, hydraulic equipment by hand (includes tank), manual valve, safety relief valve and other devices make up the system . Continuous pressing the joystick (bar), piston work, pressure increases, so that the pilot valve reaches the open or closed position. When the pressure reaches a maximum working pressure relief valve opens, high pressure oil spill back to the storage tank through the safety valve, hydraulic pipeline has remained constant, to ensure system security. I hope that by telling the above knowledge, you can better help to you. SBD20D force hydraulic hand pump _ Lu (certified) _ manual pump is provided by the Texas Lu force hydraulic machinery plant. Texas Lu force hydraulic machinery plant (www.luliyeya.com) is a leader in Dezhou, hydraulic machinery and parts, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Lu Hydraulic leadership with the staff warmly welcome all inquiries negotiations to create Lu hydraulic force a better future.