Thermal Oil Pump-Common Ways to Remove Breakdowns II

Thermal Oil Pump-Common Ways to Remove Breakdowns II (2) Mechanical reasons ①If connection between pump and coupling, due to irregularities, cause vibration and noise. It’s required to revise the coupling. ②When the dirt in oil enter into the gear oil pump, the oil pump gears and other parts get wear, thus generating noise. It’s suggested to change oil, strengthen the filter, and disassemble the pump for cleaning; for the badly worn gear, the gear should be repaired or replaced. ③When pump severely damaged or worn parts will produce vibration and noise: like the gear tooth pitch error, bad connection of two gears, tooth surface roughness high, too small backlash, the contact area not in the two gear pitch circle location, etc. In this case, replace the gear or grinding the gear. Meanwhile, needle roller bearing cage damaged, the length of the shaft journal and needle wear, can also lead to poor bearing rotation, thus produces mechanical noise, in this situation, it’s suggested for an overhaul, replacement of needle bearings. ④Gear assembly axial gap is too small; sliding gear face contact between the front and rear cover, due to failure to remove the burr carefully before assembly, thus strained joints during operation, and cause a large leak inside and output flow is reduced; dirt entering the pump and wedging between the front and rear cover of the gap, strain the surface, resulting in high and low pressure chamber due to the occurrence of radial strain and communication trenches, so that the output flow is reduced. The above situation should adopt the following measures to repair. Dismantling gear pumps, appropriately increase axial clearance gap; use grinding cover face and gear face in order to remove the burr (not chamfer) on the tooth; after grinding, end face of the unloading groove depth dimension will vary, thus width should be increased accordingly. Honghai pump.