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1. Repair of driving shaft and bushing after wear
After the gear pump drive shaft and the bush are worn, the matching clearance increases, which will definitely affect the pump oil volume. In case of this, the method of repairing the driving shaft or bushing can be used to restore its normal fit clearance. If the drive shaft is slightly worn, just press out the old bush and replace it with a standard size bush, and the fitting clearance can be restored to the allowable range. If the drive shaft and the bushing are seriously worn and the fit clearance is seriously exceeded, not only should the bushing be replaced, but the drive shaft should also be increased in diameter by chrome plating or vibration surfacing, and then ground to the standard size to restore the bushing Requirements for cooperation.
2. Repair of lubricating oil pump housing. Repair of housing cracks
Shell cracks can be repaired by welding with cast 508 nickel copper electrode. The welding seam must be tight and porous, and the flatness error of the joint surface with the pump cover shall not be greater 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 reaming method can be used to eliminate the wear marks, and then a bushing enlarged to the corresponding size can be used. The wear of the driven shaft hole is also eliminated 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 out, the inner cavity inserting method is generally adopted to repair, that is, the inner cavity is enlarged and fitted with cast iron or steel bushings. After inserting the sleeve, the inner cavity is lined with 5. Repair of the valve seat: The pressure limiting valve has two kinds of spherical valve and plunger valve. After the spherical 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 tightly sealed. If the valve seat is severely worn, it can be reamed to remove the wear marks, and then use the upper method to make it tight. After the plunger valve seat is worn, a little valve sand can be put in for grinding until it is tight.
6. Repair of pump cover
Repair of the working plane: If the working plane of the pump cover is less worn, manual grinding can be used to eliminate the wear marks, that is, put a little valve sand on the platform or thick glass plate, and then place the pump cover on it for grinding until the wear marks are eliminated. The working surface is flat. When the wear depth of the working surface of the pump cover exceeds 0.1 mm, it should be repaired by turning first and then grinding.
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