WQK Grinder Sewage Pump – Common Problems & Quick Solutions
The pump’s cutting mechanism ensures long fibers and soft solids are shredded before discharge, preventing pipe blockages and reducing maintenance costs. Problem Possible Cause Solution Pump won’t sta…
The pump’s cutting mechanism ensures long fibers and soft solids are shredded before discharge, preventing pipe blockages and reducing maintenance costs.
Problem
Possible Cause
Solution
Pump won’t start
Power not connected / phase loss / impeller stuck
Check wiring, adjust impeller gap to 0.2–0.5mm
Low flow or head
Impeller worn / reverse rotation / low voltage
Replace impeller, swap two phase wires, adjust voltage
Poor cutting performance
Gap too large / blades dull
Adjust gap, replace impeller and bottom plate
Protector trips repeatedly
Low insulation / motor overload / phase failure
Dry motor, check voltage, clean debris
Maintenance Tips: • After pumping thick slurry, run pump in clean water for a few minutes • Change oil every 300–500 hours (use #10 machine oil) • Check insulation resistance regularly (min 0.5 MΩ) • Test seal integrity at 0.2 MPa after repair
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