1. The bearing holes of the stator (oil distribution shaft) and rotor (cylinder body) of the axial piston pump type hydraulic pump belong to the high-precision mutual matching valve block. When the stator (oil distribution shaft) is subjected to the action of the axial unbalanced hydraulic working pressure, it is easy to cause wear with the cylinder (rotor) hole. The gap after wear cannot be compensated, and the leakage is large. The principle of reproduction repair is to repair the original matching gap between the rotor and stator. Under the standard of not harming the strength of the cylinder block, the cylinder block shall be boring and processed according to the wear condition; The stator (oil distribution shaft) shall be plated with hard chromium and milled to repair the original performance index and mutual clearance of parts.

2. Repair of inner inclined stator and plunger pump. The ultra-high pressure oil from the hydraulic oil pump, the hydraulic motor of the down the hole drill is distributed to the axial piston on the cylinder (rotor) through the oil inlet of the stator oil distribution shaft, the other end of the piston is connected with the roller, the roller is closely attached to the inclined stator with axial force travel arrangement by means of back pressure, and the piston of the hydraulic motor of the raise boring machine is at the bottom dead center. When the roller is in contact with the high point of the inner inclined plane of the stator, the piston is at the bottom dead center, and the hydraulic oil that is pressed back flows to the car oil tank through the return oil inlet on the oil distribution shaft. According to the drive torque caused by the repeated movement of each piston in the cylinder block (rotor) hole, the cylinder block (rotor) is driven to rotate and transmitted from the main shaft bearing. If the piston pump and rotor hole are seriously worn, it will do harm to the pulsating drink of the motor torque and speed ratio. If the roller component at the front side of the piston pump and the slide rail of the stator inner slope are seriously worn, it will also produce the pulsating drink of working pressure and impact. The overall wear of the inner inclined plane stator is relatively serious, and the stator components must be removed and replaced, and the method of laser cladding wear-resistant alloy steel shall be used to repair some of the wear; The wear of piston holes on the piston and rotor exceeds the limit, and the piston holes are bored for production and processing. At the same time, the pistons with increased specifications are replaced. The wear of some brake hydraulic motors and holes exceeds the limit, and independent production is adopted.