Overheating hydraulic pump excessive heat for two reasons, one is mechanical friction and heat. Since moving surfaces in dry or semi-dry friction state friction pump maintenance, friction between the moving parts of the heat. The second is a liquid friction and heat. High pressure oil leak to the low pressure chamber through a variety of gap, a large number of hydraulic energy into heat energy loss. Therefore, the correct choice of the gap between moving parts, fuel tank capacity and cooler pump, the pump can prevent excessive heat and high oil temperature phenomenon. Also, back to the oil filter blockage caused by excessive back pressure back to the oil pump repair, can cause high oil temperature and pump overheating. 7. Piston oil spill oil spill following main reasons: (1) the spindle shaft seal is damaged or defective scratch; (2) internal leakage is too large, resulting in increased pressure at the pump seal sales, but will seal damage or punch out; (3) the drain line too small for too long, so that the seal leakage; (4) external pump tubing loose fittings injury, the gasket aging or cracks; (5) variable adjustment mechanism bolts loose, broken seals; ( 6) Cast iron pump casing adverse trachoma or welding. Flow clockwise rotation: A to B counterclockwise rotation: B to A ● Technical Data Sheet (theoretical value, not considered ηm and ηv) Size 28 5,580,107,160,225,468 displacement Vgmax α = 25 ° (ml / r) 28.1 54.8 80 107 160 225 468Vgmin α = 70 ° (ml / r) 8.1 15.8 23 30.8 46 64.8 135 allows maximum flow Qmax (l / min) 133 206 268 321 424 531 889 at maximum speed nmax Vgmax (r / min) 4750 3750 3350 3000 2650 2360 1900nmax at Vg pump maintenance, crystal creating hydraulic assurance (certification), the hydraulic pump from Jinan Jing Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal creating hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal creating hydraulic better future.