Wire cutters flush the wire with high pressure water pump repair
The AGIE CUT AC150F HSS low-speed wire cutting machine is equipped with a high-pressure water pump (M2) for flushing and threading. However, the machine has been experiencing issues such as excessive vibration and noise, low water pressure, and unstable automatic threading performance. Initially, the water nozzles and filters were removed separately, which reduced the noise slightly, but plugging the nozzle or replacing the filter had no effect. Based on these observations, we began to suspect problems with the pump blades and the coupling between the motor and the pump body.
It’s worth noting that this particular machine uses a domestically manufactured high-pressure water pump, which performs poorly and has a short lifespan. Many AGIE CUT users now opt to purchase imported high-pressure water pumps, but they are costly and take time to arrive. After thorough analysis, we decided to disassemble and repair the unit ourselves.
The disassembly process started by disconnecting the power cable of the high-pressure water pump and marking it for reference. Next, the line plate and filter were removed. Then, the connection nut between the pump body and the motor was loosened, allowing the motor and pump body to be separated without any coupling issues. The pump body was then taken out. A pipe wrench was used to unscrew the cast copper connection seat, which was threaded to the pump body. Once removed, a set of centrifugal pump blades became accessible—there were 11 blades on each side, totaling 22. After cleaning with water, it was discovered that the blade shaft bores were worn and could not be repaired, though they could still be used. More seriously, the motor bushing in the cast copper bracket showed significant wear, with a gap of about 1 mm between the bushing and the bracket.
To address the lateral vibrations, we reconfigured the motor bushing so that it could be pressed into the inner hole of the cast copper bracket, effectively reducing the gap. For the axial turbulence issue, a hexagonal washer with a thickness of 0.6mm was added to the motor shaft.
For assembly, the modified motor shaft was placed inside the cast copper bracket first. Then, the 22 centrifugal blades were installed at both ends of the bracket using the motor shaft, with a hexagonal washer placed on every other blade. It was important not to overfill the space, as too much would eliminate the necessary clearance between the shafts. The pump body was then reassembled, and the cast copper connection seat was tightened. Finally, the pump body was reconnected to the motor, the filter and line plate were installed, and the high-pressure water pump was successfully put back together.
After the repair, the high-pressure water pump performed well, meeting the requirements for thread flushing and producing almost no noise. This repair method could be a cost-effective solution for AGIE CUT users facing similar issues with their high-pressure threading water pumps.
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