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7. Troubleshooting
No particle:
1. Feedstock may be hung up inside the hopper. Shut the machine down and check.
2. Screens are plugged. Clean the screens.
3. Fan line may be clogged. Clean as required.
Excessive power required - blown fuses:
1. Overloading of the machine. Reduce amount of feedstock put into the machine per unit of time.
2. Knives are dull. Sharpen or replace knives and re-install.
3. Knife gap is too large. Adjust knives to proper gap specification.
4. Clearance between the rotor knives and screen is too small. Check that the screen is properly seated in the screen
chamber.
Machine stalls:
1. Overloading of the machine. Reduce amount of feedstock put into the machine per unit of time.
2. Pieces of feedstock jammed in the rotor. Clear the jammed material then visually inspect the rotor to ensure it is
not damaged and that the knife gaps are correct.
3. Machine has loose or thrown belts. Inspect, and if acceptable for use, re-install and tighten per maintenance
instructions.
Bearings sound noisy or are hot:
1. Lack of lubrication. Lubricate per maintenance instructions.
2. Overloading of the machine. Reduce amount of feedstock put into the machine per unit of time.
3. Bearings have exceeded their rated life. Consult with the SEM service department for replacement instructions.
4. Bearings are not properly installed or tightened. Consult with the SEM service department for installation
instructions.
Belts slip or squeal:
1. Belts are too loose. Tighten per maintenance instructions.
2. Overloading of the machine. Reduce amount of feedstock put into the machine per unit of time (see above).
3. Machine has thrown belts. Inspect, and if acceptable for use, re-install and tighten per maintenance
instructions.
Motor will not start:
1. Fuses are blown. Replace fuses with the size and type shown on the wiring diagram (located in the control
enclosure).
2. A limit switch is open. Check the limit switches at the machine front doors and any hopper cleanout
door. Ensure proper actuation and replace if required.
3. Verify that the correct pushbuttons are being depressed and that the main disconnect switch is in the ON position.
Particle builds up in the transition or tubing:
1. Fan is too small. Replace with larger unit or fan wheel.
2. Transition or tubing is clogged. Clean as required.
3. Return air vents are covered or too small. Ensure the vents are open.
4. Fan is not evacuating properly. Check for loose fan wheel on shaft, worn fan wheel, or loose fan drive belts.
5. Feedstock hangs up in the hopper or cutting chamber. Material being placed into the machine for processing is too
large for the hopper, cutting chamber, or rotor diameter. Reduce the initial size of the feedstock.
6. Knives are dull. Sharpen or replace knives and re-install.
7. Overloading of the machine. Regulate the in-feed of scrap to uniformly feed the machine over an extended time
period.
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