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16
6. Troubleshooting
Possible Problems and Solutions:
1.
Pre-shredder will not start:
a.
Check that the emergency stop button is pulled out.
b.
Check that the power supply switch is on.
c.
Lastly, contact an electrician to check the electrical panel for blown fuses, tripped circuit breakers or
overload resets.
2.
No particle output:
a.
Feedstock may be jammed inside the hopper. Shut the machine down and check. Be sure to de-
energize the machine using proper LOTO procedures.
b.
Security screens are jammed or plugged. Refer to
Service Instructions
for accessing the screens.
c.
Duct run to the fan may be clogged. Clean as required.
3.
Excessive power required – blown fuses:
a.
Machine is overloaded. Reduce amount of feedstock put into the machine per unit of time.
b.
Knives are dull. Sharpen or replace knives and re-install (See section
5.1 Changing Knives
).
c.
Knife gap is too large. Adjust knives to proper gap specification.
d.
Clearance between the rotor knives and screen is too small. Check that the screen is
properly seated in the screen chamber.
4.
Machine stalls:
a.
Machine is overloaded. Reduce amount of feedstock put into the machine per unit of time.
b.
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.
c.
Machine has loose or thrown belts. Inspect, and if acceptable for use, re-install and tighten per
maintenance instructions.
5.
Bearings are noisy or hot:
a.
Lack of lubrication. Lubricate per maintenance instructions.
b.
Machine is overloaded. Reduce amount of feedstock put into the machine per unit of time.
c.
Bearings have exceeded their rated life. Consult with SEM customer service for replacement instructions.
d.
Bearings are not properly installed or tightened. Consult with SEM customer service
for installation instructions.
6.
Belts slip or squeal:
a.
Belts are too loose. Tighten per maintenance instructions. (see section
5.3 Belts
)
b.
Machine is overloaded. Reduce amount of feedstock put into the machine per unit of time.
c.
Machine has thrown belts. Inspect, and if acceptable for use, re-install and tighten per
maintenance instructions. If not, replace. (see section
5.3 Belts
)
