Attention should be paid to the installation and use of Hydraulic Gear Pump of loader
One, hydraulic pump connection matters needing attention
(1) Before the installation of the hydraulic pump, an appropriate amount of hydraulic oil should be added to the pump cavity.
(2) The hydraulic pump is installed in the torque converter housing and gearbox housing, and the coaxiality of the hydraulic pump shaft and the driving oil pump shaft should be less than 0.03mm.
(3) Suction pipe should be as short, straight, large and thick as possible. The suction pipe should be set with a Hydraulic Oil Filter whose nominal flow is not less than 2 times of pump flow (the filtering accuracy is generally 80 ~ 180μm). The suction pipe of the hydraulic pump should be directly connected with the oil tank, and the back pressure of the oil return should not be greater than 0.05MPa. The suction pipe and return pipe of the oil pump should be below 200mm of the lowest oil level of the oil tank.
(4) the import and export of the hydraulic gear pump should be firmly installed, and the sealing device should be reliable, otherwise it will produce the phenomenon of air inhalation or oil leakage, affecting the performance of the hydraulic pump.
(5) The self-priming height of the hydraulic gear pump is not more than 500mm (or the inlet vacuum is not more than 0.03mpa), and the oil level in the hydraulic tank should be kept at the normal height.
(6) before the installation of the hydraulic gear pump, check whether the depth of the installation hole is greater than the shaft extension length of the pump, to prevent the phenomenon of the top shaft, otherwise it will burn out the pump.
Two, the use of hydraulic pump matters needing attention
(1) When the hydraulic pump is started, it should be moved several times. After the oil flow direction and sound are normal, it should be operated for 5 ~ 10min under low pressure, and then put into normal operation. Before starting the plunger pump, clean working oil must be injected into the pump through the drain port on the pump housing.
(2) the change of oil viscosity is affected by temperature, oil temperature rise and viscosity decrease, so the oil temperature is required to keep below 90℃, in order to make the hydraulic pump can work stably at different working temperatures, the selected oil should be subject to small temperature change viscosity oil temperature characteristics, as well as good chemical stability and foam resistance. L-hm46 (GB11118.1-94) anti-wear hydraulic fluid is recommended.
(3) Oil must be clean and shall not be mixed with mechanical impurities and corrosive substances. The hydraulic system without filter on the suction pipe must be refuelled to the tank by the filter tanker (filter accuracy less than 25μm).
(4) the highest pressure and the highest speed of the hydraulic pump, refers to the peak value allowed when used in a short period of time. Hanfeng reminds us to avoid long-term use, otherwise it will affect the service life of the hydraulic pump.
(5) The normal working oil temperature of the hydraulic pump is 15 ~ 65℃, and the highest temperature on the pump shell is generally 10 ~ 20℃ higher than the inlet oil temperature of the tank pump. When the oil temperature in the tank reaches 65℃, the maximum temperature on the pump shell does not exceed 75 ~ 85℃.
