Hydraulic transmission with manual with variable axial piston pump, by subject and body composition variables, body by the pump casing, drive shaft, cylinder, a plurality of pistons, Slipper, return plate, return spring, a small spring, with oil pan, pump, etc., between the drive shaft and the cylinder splined plunger fitted in the cylinder bore manually variable pump plunger, plunger ball and shoe associated, in the card shoe return plate hole on the pump and the pump housing associated with the oil pan fitted between the cylinder and pump, variable by variable body shell, variable head, large dial block, small block dial, dial columns and variables valve composition, variable valve mounted on the shell variable, the variable head and variables associated bearing housing through variable piston pump, a small dial mounted on the rear derailleur column block installed in the variable valve inserted in the lower end of the column set aside large dial block, big block with screws aside in a variable head, body and variables associated with the screw body, shoe close to the variable head, respectively, by the drive shaft bearings mounted on the pump housing and variable, with a small , light weight, low noise, long life advantages. The amount of valve anti-tank. When a loop, the load should a feedback signal LS (i.e. load), these two quantities are added together (LS with the spring force and), and if the pressure exceeds the high pressure oil pump, the three-way flow valve pushed up, so that the flow through the three-way flow valve is reduced. Flow to the load increases. Excess flow through the three-way flow valve back into the tank. Keep both ends of the orifice flow through the three-way valve pressure constant. Throttle pressure differential only depends on the size of the spring force, is not affected by the load. Under the same pressure piston pump v38, the greater the variable orifice area of ??the pump, the flow is greater. Troubleshooting: Unloading at 20bar pressure is always above, this may be due to the three-way flow valve is fully open, check-way flow valve spool movement is flexible and, if necessary, replace the valve, including the damping; pressure system is always not reach the predetermined value, the leakage may be three-way flow control valve is too large. Then we must replace three-way flow control valve piston or connecting blocks. Domestic variable pump, variable pump, hydraulic pressure from Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!