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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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