If you're using our popular KANG INDUSTRIAL ZCB-700D Electric Hydraulic Pump (SKU: 162206V240) for punching, bending, or jack applications and suddenly find it's not building pressure, you're not alone. This is one of the most common issues we see – and the good news is it's often straightforward to resolve with a few simple checks and adjustments.
This 750W, single-acting solenoid valve power pack delivers up to 10,000 PSI (70 MPa) with a 7L oil capacity and pedal switch control. It's built tough for workshop and site use, but impurities in the hydraulic oil or minor setup issues can temporarily block pressure build-up.
Common Cause: The most frequent culprit is contamination (dirt, debris, or particles) blocking the internal valve – often from hydraulic oil or when attaching custom workpieces. Don't worry – follow these steps to get back up and running.
Step-by-Step Fix (Safety First!) Always unplug the unit, wear eye protection, and work in a well-ventilated area. If you're unsure, contact our support team before proceeding.
- Clean Position A. Remove the bolt and any metal cover/piece at the designated position A (refer to the above picture). Use compressed air to blow out any debris, or briefly run the pump to flush oil through. Why? This clears potential blockages in the internal valve.
- Loosen Position C Slightly loosen the nut at position C – do not remove it completely. Why? This allows air to enter during operation, helping the pump prime and build pressure.
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Adjust Pressure at Position B Use a spanner to loosen the outer nut counterclockwise. Then use a 6mm hex (Allen) key on the inner nut:
- Clockwise = increase pressure
- Counterclockwise = decrease pressure. Make small adjustments (quarter-turns) and test. Once set, tighten the inner nut, then secure the outer nut firmly (hand-tight is not enough – it should resist turning by hand). Why? This resets or fine-tunes the pressure relief valve, which can sometimes get out of adjustment or stuck.
After these steps, test the pump again – it should now build pressure normally.
Important Reminders & Tips
- Max Pressure: Never exceed 70 MPa (10,000 PSI) to avoid damage. If you adjust pressure for your application, note the setting and let us know – it helps if issues arise later.
- Custom Workpieces: If you've added your own fittings or tools to the oil outlet, check the seals. Incomplete sealing can cause oil spray during operation and prevent proper pressure holding. Top up hydraulic oil to the recommended level before testing.
- Prevention: Always use clean, high-quality Hydraulic Oil and keep the reservoir filled. Avoid introducing contaminants when changing fittings.
- When to Contact Us: If these steps don't resolve the issue, or if you're seeing unusual noises/leaks, send us photos/videos via kang@kakaindustrial.com or reply to your order. We're here to help!
This quick fix has resolved the issue for many customers.
Other Busbar Machines are available.
Have questions or need parts? Drop a comment below or reach out – we're based in Australia and ready to assist.