Troubleshooting Common Hydraulic Pressure Drops in Concrete Machinery

A loss of pumping stroke force is one of the most frustrating jobsite issues. Here is our systematic troubleshooting sequence: 1. **Check Accumulator Nitrogen Charge:** A ruptured 4L or 6L bladder will cause jerky S-tube shifting and massive pressure spikes on the main gauge. 2. **Inspect Main Relief & Unloader Valves:** Contamination in pilot orifices can cause valves to dump flow back to tank prematurely. 3. **Volumetric Efficiency Test on Main Piston Pump:** Measure case drain flow under maximum operating pressure to verify internal slippage.