Digging machine hydraulic pump failure

If the hydraulic pump of the digging machine fails, the boom load cannot be raised, and to troubleshoot the problem of the hydraulic pump, the following three conveniences are the starting targets.
1. When the pit pump hydraulic pump is seriously worn out. When the pump is running at low speed, the leakage in the pump is serious. At high speed, the pump pressure slightly increases. However, due to the wear and internal leakage of the pump, the volumetric efficiency drops significantly and it is difficult to reach the rated pressure. The long time working of the hydraulic pump exacerbates the wear and causes the oil temperature to rise, which causes the wear of the hydraulic components, the aging and damage of the seal, the loss of the sealing ability, the deterioration of the hydraulic oil, and eventually the failure.
2. The selection of hydraulic components is unreasonable. The boom cylinder specifications are 70/40 non-standard series, and the seals are also non-standard parts. The manufacturing cost is high and the seal replacement is inconvenient. Boom cylinder bore is small, it is bound to set the system high pressure.
3, digging machine manufacturers hydraulic system design is unreasonable. The control valve and the hydraulic steering gear are connected in series with a single pump. The safety valve is set at a pressure of 16mpa, and the hydraulic pressure rating of the excavator hydraulic pump is also 16mpa. Hydraulic pumps often work under full load or long-term overload (high pressure) conditions, and the system has hydraulic impact, long-term oil change, hydraulic oil contamination, exacerbated wear of hydraulic pumps in digging machines, resulting in serious hydraulic consequences The pump casing bursts.