Davis-Standard MEDD / Super Blue

Melt temperature above setpoint is usually excessive shear from screw speed or a barrel zone that has drifted. Melt temperature below setpoint usually means a barrel heater or thermocouple failure.

Axial clicking or rumbling from the gearbox area indicates thrust bearing wear from high back pressure or lubrication starvation. Check gearbox oil level and back pressure setting before scheduling a bearing replacement.

Extruder surge is typically caused by inconsistent feed from the hopper, worn screw, or incorrect screw temperature profile. Verify feed zone temperature and throat cooling before adjusting screw speed.