1. Repair of the drive shaft and bushing after wear
After the gear pump drive shaft and bushing wear, the matching clearance increases, which will affect the pump oil quantity. In this case, the normal fit clearance can be restored by repairing the drive shaft or bushing. If the drive shaft wears slightly, simply press the old bushing and replace it with a standard size bushing to match the clearance to the allowable range. If the drive shaft and bushing are severely worn and the clearance is severely exceeded, the bushing must be replaced, and the drive shaft should be chromed or vibrated to increase its diameter, then ground to standard size, and the bushing is restored. Coordination requirements.
2. Repair of cracks in the repair of the lubricating oil pump housing
The shell crack can be repaired by casting 508 nickel-copper welding rod. The weld must be tight and the air hole, and the flatness error of the joint surface with the pump cover is not more than 0.05 mm.
3. Repair of the wear of the drive shaft bushing hole and the driven shaft hole
After the drive shaft bushing hole is worn, the wear marks can be removed by reaming, and then the bushing is enlarged to the corresponding size. The driven shaft hole wear also eliminates the wear marks by reaming, and then the driven shaft is prepared according to the actual size of the reamed hole.
4. Repair of the inner cavity of the pump casing
After the inner cavity of the pump casing is worn, it is generally repaired by the inner cavity inserting method, that is, the inner cavity is enlarged and then cast with cast iron or steel bushing. After the sleeve is set, the inner cavity æª5 and the valve seat are repaired: the pressure limiting valve has two kinds of a spherical valve and a plunger type valve. After the spherical seat is worn, a steel ball can be placed on the valve seat, and then the steel ball is gently tapped with a metal rod until the ball valve is in close contact with the valve seat. If the seat is severely worn, it can be first reamed to remove the wear marks, and then the upper method is used to make it close. After the plunger seat is worn, a small amount of valve sand can be placed for grinding until it is tight.
5, the repair of the pump cover
Repair of the working plane: If the working plane of the pump cover is less worn, the wear marks can be eliminated by manual grinding, that is, put a little valve sand on the platform or thick glass plate, and then put the pump cover on it for grinding until the wear marks are eliminated. The working surface is flat. When the working surface of the pump cover wears more than 0.1 mm, it should be repaired by turning and grinding first.
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