Naniwa Pump Manual - [work]

Naniwa pumps are precision-balanced. Using a rubber mallet to force pipes into alignment is a common fatal error.

Given that Naniwa Pump Mfg. Co. merged with EBARA in the 2010s, finding legacy manuals can be challenging. Do not rely on random PDF hosting sites. Use these verified channels: naniwa pump manual

| Problem | Immediate Check (Manual Reference) | Solution | | :--- | :--- | :--- | | | Is the pump primed? (Section 4.2) | Flood the suction line. Replace foot valve. | | Low flow | Is the impeller diameter correct? | Check for wear ring damage. Replace impeller. | | Excessive vibration | Shaft alignment (Section 2.7) | Realign coupling. Balance the impeller. | | Leaking at shaft seal | Flush line pressure too high (Section 6.3) | Reduce flush pressure to 0.5 bar above suction. | | Overheating bearings | Wrong grease type (Appendix C) | Flush bearings with ISO VG 46. | | Gear pump "hammering" noise | Relief valve stuck (NGP Manual, p. 12) | Disassemble and clean the poppet valve seat. | Naniwa pumps are precision-balanced

In the TOP series magnetic drive pumps, a clicking noise indicates decoupling. The manual states: Stop immediately. The magnetic drive has overheated due to dry running or excessive back pressure. Wait 60 minutes for cooling before attempting reset. Use these verified channels: | Problem | Immediate

: For older or project-specific models (like ship JS 99-023), specialized Parts and Service Manuals are available, detailing sectional drawings and material lists. Maintenance & Troubleshooting Essentials

A: Drain the casing completely via the bottom plug. For gear pumps, disconnect the suction line and blow compressed air through the cavity to remove residual liquid.