With the growth of the use of time, there will be insufficient gear pump oil pump, pump or even failure, mainly due to excessive wear and tear on the parts. Gear pump wear parts are the main shaft and bushings, passive gear center hole and shaft pin, pump housing cavity and gear, gear end face and pump cover. Lubricating oil pump wear and tear of its main technical indicators fail to meet the requirements, it should disassemble, find out the location and extent of wear and tear, to take appropriate measures to be repaired. First, the drive shaft and bushing wear repair Gear pump drive shaft and bushing wear, with the gap increases, will certainly affect the pump oil. In this case, you can repair the drive shaft or bushing method to restore its normal with the gap. If the drive shaft wear slightly, simply press the old bushing and put on the standard size bushing, with the gap can be restored to the allowable range. If the drive shaft and bushing wear serious and serious with excessive clearance, not only to replace the bushing, and the drive shaft also applies chrome or vibration welding method to increase its diameter, and then grinding to the standard size, recovery and bushing With the requirements. Second, the repair of the lubricating oil pump Shell crack repair: shell 508 can be used to crack nickel-copper welding electrode repair. Welds to be close and yuan stomatal, with the flatness of the pump cover with no more than 0.05 mm flatness. Drive shaft bushing hole and driven shaft wear and tear repair: Drive shaft bushing hole wear, the reaming method can be used to eliminate wear marks, and then with increased to the appropriate size of the bushing. Followed by wear and tear of the shaft shaft wear to eliminate traces of wear and tear, and then press the actual size of the hole after the preparation of driven shaft pump chamber cavity repair: pump housing cavity wear, the general approach to repair the lumen, After the enlarging of the inner cavity is set with cast iron or steel bushings. After setting the sleeve, the cavity enamel to the required size, and wear out the end face of the bushing to make it flush with the combination of the pump housing. Seat Repair: Pressure limiting valve has two kinds of ball valve and plunger valve. Ball seat wear, the ball can be placed on a valve seat, and then gently tap the metal ball, until the ball valve and valve seat so close. If the valve seat is worn seriously, first remove the worn marks by reaming, and then use the method to make it close. Plunger seat wear, you can put a little valve sand grinding until close together. Third, the pump cover repair work plane repair: If the pump cover wear a small work surface, available manual grinding method to eliminate wear marks, that is, put a little glass or valve plate on the platform sand, and then put the pump cover on the ground , Until the wear marks disappear, the work surface is flat so far. When the pump cover working surface wear depth of more than 0.1 mm, should be taken after the turning grinding method to repair. Repair of drive shaft bushing hole: The repair of drive shaft bushing hole on pump cover is the same as repair method of wear of drive shaft bushing hole of housing. Fourth, the gear turning gear gear wear is mainly in the tooth thick parts, and the gear face and tooth top wear are relatively light. Gear teeth in the thick parts are unilateral wear, so the gear can be turned 180 degrees to use. When the gear end wear, the end face can be polished, while grinding the lubricating oil pump housing junction to ensure that the gap between the gear end face and the pump cover within the standard range.
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