The main features of the manual hydraulic pump: power to manual portable hydraulic hand pumps, high pressure, large displacement, ultra-compact, portable, simple operation, wide range of applications. Manual hydraulic pump main body portion is part of a double-acting hydraulic hand pumps, high pressure working chamber, the low-pressure working chamber, two-way valve, high pressure valve (safety valve), low pressure valves, unloading valves, two check valves, feed port and so on it. Around the hole organically linked. Two one-way valves to prevent the pressure oil return, its size, the effect is the same. The role of the low-pressure and high-pressure valve is a pressure control valve, respectively, to control the pressure in 1Mpa and 63Mpa. Power inlet at the two ball check valve. After the work is completed to open the unloader valve, pressure oil flow back into the reservoir tube hydraulic hand pump, hand pump at the time of completion of unloading from the following service find the problem, and to improve the system: 1. Check the boom cylinder leakage situation. The easiest way is to raise the boom to see if there is a significant decline of 2 free, if the whereabouts of obvious disassemble cylinder inspection, such as worn seals should be replaced. 3, check the control valve. First clean the safety valve, check valve body wear, such as wear and tear should be replaced. 4. After you install the safety valve if there is still no change, and then check the control valve spool wear single-acting hydraulic hand pumps, the gap is generally limits the use of 0.06mm, severe wear and tear should be replaced. 5, measuring manual hydraulic pressure. If the pressure is low, then make adjustments, plus the pressure is still not tune up, then hand pump heavy wear double-acting hydraulic hand pumps, hydraulic hand pumps Yantai, Shandong power hydraulic hand pumps provided by the Texas Lu of the hydraulic machinery plant. Texas Lu force hydraulic machinery plant (www.luliyeya.com) strong, credible, in Dezhou hydraulic machinery and components industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Lu Hydraulic and you hand into the brilliant, for a better future!