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| Problem |
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Possible Cause |
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Possible Solution |
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| Motor overload of vacuum pump |
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Too much water is being supplied to the pump |
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Adjust water supply untill maximum vacuum is achieved with minimum water supply |
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Current draw exceeds power of motor |
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Check the motor data tag |
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Too less water is being supplied to the pump |
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Adjust water supply untill maximum vacuum is achieved with minimum water supply |
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The exhaust line has a restriction or is not connected to a vent open to the atmosphere |
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Unclog the line / connect it to an open vent |
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| Vacuum too low |
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Water too warm |
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Adjust water temperature (cold water produces more vacuum) |
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| Barrel Heat Zone will not reach the set point |
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Heater band burned out |
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Replace heater band |
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Pyrometer is not energized when the temperature drops below the set point |
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Replace the pyrometer |
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Mercury contactor in control cabinet not energized or faulty |
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Replace mercury contactor |
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Overload protection circuit breaker for the individual heater zone is not energized |
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Energize circuit breaker for appropriate zone |
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Thermocouple is not seated in the thermocouple well |
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Seat the thermocouple well again |
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Thermocouple or heater bands reversed at their zones (Example: Zone 2 thermocouple sensing a low temperature in Zone 2 and adding heat to Zone 1 |
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Switch thermocouple or heater band to the proper zone |
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Cooling control solenoid stuck in the open position |
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Replace control solenoid |
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| Heat zone overriding the set point |
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Pyrometer does not de-energize when the temperature exceeds the set point |
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Replace the pyrometer |
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Pressure relief valve stuck in the open position |
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Replace the relief valve |
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Thermocouple or heater bands reversed at their zones (Example: Zone 2 thermocouple sensing a low temperature in Zone 2 and adding heat to Zone 1 |
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Switch thermocouple or heater band to the proper zone |
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Insufficient water flow through the heat exchanger. Heat exchanger is clogged or the globe valve is closed |
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Check hoses, unclog heat exchanger or open globe valve. Replace heat exchanger |
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Solenoid for zone's fluidcontrol not opening |
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Replace defective solenoid |
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Defective pump, motor, thermal overload or coupling |
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Replace defective pump, motor or coupling |
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Oil system plugged or clogged |
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Change oil filter. Clean and flush oil systems |
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| Screw temperature will not reach the set point |
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Heater band is burned out |
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Replace the heater band |
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Thermocouple is defective |
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Replace the thermocouple |
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Pyrometer : Not energizing the mercury contactor |
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Replace the pyrometer |
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Cooling solenoid continuously energized |
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Replace the solenoid |
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Mercury contactor is defective |
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Replace the mercury contactor |
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Cooling fluid solenoid valve is stuck open |
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Replace the solenoid valve |
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Insufficient fluid flow: clogged filter |
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Change the filter |
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Faulty pump, motor or coupling |
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Replace |
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Oil system plugged or clogged |
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Change oil filter. Clean and flush oil system |
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| Screw temperature overriding the set point |
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Pyrometer does not deenergize when the temperature exceeds the set point |
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Replace the pyrometer |
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Thermocouple near the flow meter outlet is defective |
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Replace the thermocouple |
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Insufficient water flow through the heat exchanger |
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Unclog or replace heat exchanger |
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Water solenoid supply not energized or stuck in the close position |
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Replace the solenoid |
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Cooling fluid solenoid valve stuck closed |
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Replace solenoid valve |
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Pressure relief valve stuck open |
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Replace relief valve |
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Filter clogged |
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Change filter |
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Faulty pump, motor, thermal, overload or coupling |
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Replace |
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Oil system plugged or clogged |
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Change oil filter. Clean and flush oil system |
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| Insufficient vacuum for venting |
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Insufficient water flow |
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Check hose |
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Check hose clamps and manifold bolts for tightness |
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Check O-rings in sight glass |
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Clean out gate valve |
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Change the filter |
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Check solenoid valve |
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Check pump, motor and coupling |
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| Excessive vibration |
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Poor coupling alignment at motor |
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Realign coupling |
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Defective bearing in the reduction gearbox |
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Replace the bearing |
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Defective bearing in the motor |
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Replace the bearing |
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| Thumping noise in the rear of the machine |
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Defective bearing in the distributor gearbox |
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Replace defective bearing |
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Rough spot on gear inside distributor gearbox |
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Remove rough spot on gear |
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Poor coupling alignment between the reduction and distributor gearboxes |
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Realign coupling |
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| Erratic drive RPM |
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Faulty speed board in DC drive |
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Replace speed board |
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Faulty current board in DC drive |
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Replace current board |
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Faulty input voltage to DC drive |
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Correct the voltage supply |
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Excessive current being drawn from the drive |
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Check / Replace DC drive motor |
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| Starve feeder auger does not operate |
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The reference potentiometer is set to zero |
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Reset or replace the potentiometer |
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The control is not receiving the start input due to debris in the start button |
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Clean out control buttons |
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The starting coil has not received an output from the control or is faulty |
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Check the connection and/or replace the starting coil |
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The drive fuses have blown |
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Replace the fuses |
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The feeder drive is faulty |
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Replace the motor |
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The armature fuse has blown |
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Replace the fuse |
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Optional signal conditioned card used for slaving the main extruder motor and the feed auger has failed |
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Replace the card |
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| Starve feeder auger operates but will not achieve full speed |
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Main motor potentiometer is set low or to zero |
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Increase the setting of the main motor potentiometer |
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| The entire extruder is overheating |
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The water saver solenoid has failed in the closed position or blown in related fuse |
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Check the solenoid valve and/or replace the fuse |
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The cooling water supply to the extruder is dirty causing restricted flow or the supply pressure is insufficient |
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Change the filter or check the supply line for leaks |
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