1. Repair the pump housing cavity pump housing cavity after abrasion, in general, casement law cavity repair, upcoming cavity Boring big set with cast iron or steel liner after sets. After the casement, the cavity lining 5, seat repairs: pressure limiting valve and plunger valve has two ball valves. After the spherical seat wear can be a ball on the seat, and then gently tap the ball with a metal rod until the ball and seat snug. Such as seat badly worn hinges can be trimmed to grind marks, then the law to make it close together. After the plunger seat wear, you can put a little sand valve grinding until snug.
2. The pump cover repairs, repair work plane: If the pump cover work wear smaller plane can be used hand-grinding method to eliminate signs of wear, that put a little sand valve on the platform or thick glass, and then carried on top of the pump cover grind until eliminate signs of wear, work surface until smooth. When the pump is working flat cover more than 0.1 mm wear depth, should take the first turning grinding way to repair.
3. Repair gear pump drive shaft and bushing wear, with the gap increases, will affect the fuel pump. If this method can be used to repair the drive shaft or sleeve resume its normal with the gap. If the drive shaft wear light, simply press out the old bushings replaced after standard size bushing, with the gap can be restored to the permitted range. If the driving shaft and bushing wear serious and with the gap seriously overweight, not only to replace the bushings, and a drive shaft also applied chrome or vibration welding method will increase its diameter, and then grinding to a standard size, recovery and bushes coordination requirements.
4. housing repair, crack the shell of available nickel-copper rod casting 508 welding. Weld must close and Yuan pores, combined with the pump cover face flatness error of less than 0.05 mm.
5. Wear repair, after the drive shaft bushing bore wear, available reaming method to eliminate signs of wear, and is equipped with a corresponding increase to the size of the bush. Also driven shaft bore wear reaming method to eliminate signs of wear, and then press the actual size of the hole after reaming preparation of the driven shaft.