With the prolongation of use time, the Rexroth gear pump will have insufficient pump oil, or even no oil pump problem. The key factor is the relative position of excessive wear. The key position where the gear pump passes out is the Lux drive shaft and the bushing has a central hole and a shaft pin driven gear, the gear pump body cavity, and the end face of the gear pump cover. After the lubricating oil pump is worn and its main technical indicators fail to meet the requirements, it should be replaced and disassembled, and the position and degree of wearing the logo should be taken to take effective measures to give maintenance.

1. Rexroth gear pump drive shaft and bush wear repair

"When the drive shaft and bushing are worn, the gap between the drive shaft and the bushing increases, and the Rexroth gear pump oil volume must be affected." In this case, it can be used to repair the normal working clearance of the drive shaft or bushing. If the drive shaft is worn and the light is on, simply press down on the old bushing and replace it with a standard gauge liner to restore the gap to allowable category. If the severity of the drive shaft and the bushing is serious, and the severity of the fit clearance exceeds the standard, not only the bushing needs to be replaced, but the drive shaft should also be chrome-plated or vibratory surfacing to increase the diameter of the bushing, and then meet the specifications, the interfit between the repair and the bushing was fixed.

2. Rexroth gear pump shell crack repair in house repair:

Cracks in the Rexroth gear pump shell can be repaired by welding with 508 nickel-copper electrodes. The welding seam is tight, forming air holes, and the flatness deviation of the joint surface with the pump cover is not more than 0.05mm.

Grinding repair of drive shaft bushing hole and driven shaft hole: After the bushing hole is worn, the wear marks can be removed by reaming, and the bushing of the corresponding specification can be used to wear the driven shaft hole and removed by reaming wear marks, then adjust the driven shaft according to the actual specification of the hole after reaming

Repair the inner cavity of the pump casing: wear the inner part of the pump casing, usually the lumen casement repair method, is a set of cast iron or steel lining with the large inner cavity lining. After the sash, the inner cavity is lined to a predetermined size, and the protruding end surface of the wear sleeve is combined with the pump casing so that it is flush with the surface.

Seat repair: There are two types of pressure limiting valves: ball valve and plunger valve. After the ball valve seat is worn, a steel ball can be placed on the valve seat, and then the steel ball can be tapped lightly with a metal rod until the ball valve and the valve seat are closed. When the valve seat is severely worn, the wear marks should be removed with a relatively small hole first, and then the upper method should be used to close it. After the piston valve seat is worn, a small amount of valve sand can be put in to grind it until it is closed.

3. Rexroth gear pump cover repair

Repair of the working plane: If the working plane of the pump cover is worn, the grinding marks can be removed by manual grinding, that is, a small amount of valve sand is placed on the platform or a thick glass plate, and then the pump cover is placed on the upper side for grinding until it is ground Removes scratches and keeps the work surface clean. The depth of the working plane of the pump cover is worn. If it exceeds 0.1mm, it should be repaired by turning and grinding for the first time.

Drive shaft bushing hole repair: drive shaft bushing hole pump repair wear cap and wear the same way, housing drive shaft bushing hole repair

4. The flipping application of gears

The key to gear wear in Rexroth gear pumps lies in the tooth thickness, while the wear of the gear end face and tooth top is relatively light. The gears are all worn on one side of the tooth thickness so the gears can be turned 180 degrees for use. When the end face of the gear is worn, the end face can be ground flat, and the housing of the lubricating oil pump can be ground at the same time.