Gear oil pump maintenance: When the inner cavity of a gear oil pump wears out, it is typically repaired by using the inner cavity lining method. The inner cavity is first enlarged, and then lined with cast iron or steel sleeves. After lining, the inner cavity is refaced.

2. Valve Seat Maintenance: Pressure relief valves come in two types: spherical valves and plunger pump valves. After a spherical valve seat wears, place a bearing steel ball onto the valve seat, then gently tap the bearing steel ball with a metal rod until the gate valve and seat achieve a seal. If the valve seat is severely worn, first file away the scratches, then use the aforementioned method to achieve a seal. For a plunger pump valve seat that has worn, pour a small amount of cylinder sand into it for grinding until a seal is achieved.

3. Maintenance of Gear Oil Pump Cover and Working Plane Diagram: If the working plane diagram of the KCB gear oil pump cover shows minor wear, it can be manually polished to remove the wear marks. This involves sprinkling a small amount of emery on a service platform or thick glass, then placing the pump cover inside for grinding until the wear marks are removed and the working surface is flattened. When the wear depth of the working plane diagram exceeds 0.1mm, a method of first cutting and then polishing should be used for repair.

4. Gear Oil Pump Repair After the gear oil pump's drive shaft and sleeve wear out, the clearance between them expands, which can eventually harm the oil valve flow. In such cases, repairing the drive shaft or sleeve can restore the regular fit clearance. If the drive shaft wear is minor, simply remove the old sleeve and replace it with a standard-sized sleeve to restore the fit clearance to an allowable range. For severe wear on both the drive shaft and sleeve with a significant clearance exceeding standards, both the sleeve and the drive shaft must be replaced. The drive shaft can be resized using stainless steel or oscillating spray welding, then machined back to the standard size, ensuring the proper fit with the sleeve.

5. Gear Oil Pump: After the gear oil pump's drive shaft bushing bore and the driven bore shaft are worn, the worn bore can be cleaned by broaching to remove the wear marks, followed by fitting a bushing reinforced to the corresponding specifications. The worn driven bore shaft can also be cleaned by broaching to remove the wear marks, and then the driven shaft is fitted according to the specific dimensions of the broached bore.

6. Repair cracks in the lubrication pump housing can be achieved using cast 508 nickel-tin welding rods. The weld must be tight with no air pockets, and the flatness deviation between the welding surface and the pump cover must not exceed 0.05mm.