Causes of the fault:
⑴ Contaminants or debris on the impellers, resulting in insufficient clearance;
⑵ Gear wear, leading to excessive backlash;
⑶ Loose gear fixation, preventing the impellers from remaining synchronized;
⑷ Bearing wear, resulting in increased internal clearance.
Solutions:
⑴ Remove contaminants and inspect internal components for damage;
⑵ Adjust gear backlash; if the gear backlash exceeds the average value by 30%–50%, the gears should be replaced;
⑶ Reassemble the gears, ensuring that the contact area for the tapered fit reaches at least 75%;
⑷ Replace the bearings.