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What are the causes of wear on the housing of a Rexroth gear pump? Shenzhen Autos today wants to talk to you about the issue of shell wear in Rexroth gear pumps. 1. The main reason is excessive wear in the relevant areas. The worn parts of a gear pump mainly include the drive shaft and bushing, the central hole of the driven gear and the shaft pin, the inner cavity of the pump casing and the gears, as well as the end faces of the gears and the pump cover. When the main technical specifications of a lubricating oil pump are no longer met due to wear, it should be disassembled to identify the location and extent of the wear, and appropriate measures taken for repair. Repair of wear in the drive shaft bushing hole and the driven shaft hole: When the drive shaft bushing hole is worn, the wear marks can be removed by reaming, after which a bushing of an enlarged size can be used. Wear in the driven shaft hole is also eliminated by reaming to remove the wear marks, after which the driven shaft is fabricated according to the actual dimensions of the reamed hole. 2. When the drive shaft and bushing of the Rexroth gear pump wear out, the clearance between them increases, which will inevitably affect the oil delivery volume of the pump. In such cases, the normal clearance fit can be restored by repairing the drive shaft or bushing. If the drive shaft is only slightly worn, it is sufficient to press out the old bushing and replace it with a bushing of standard size; the clearance can then be brought back within the allowable range. 3. Repair of the internal cavity of the Rexroth gear oil pump casing: When the internal cavity of the pump casing is worn, the repair method generally involves lining the cavity, that is, enlarging the cavity and then fitting a cast iron or steel liner into it. After fitting the bushing, the inner cavity is lined to the required dimensions, and the portion of the bushing that protrudes from the end face is ground down so that it is level with the surface in contact with the pump casing.