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7 Troubleshooting
The following tables list problems that could occur when using the
granulator. This general information may help to locate the cause
of the problem and allow it to be resolved promptly. When a
problem arises, it is advisable to perform the simplest checks
before proceeding to more complicated ones, which may
subsequently prove unnecessary.
7-1 General Problems
Problem Possible Causes Possible Remedies
Overheating of bearings Dirt or contamination in the bearing
Excessive belt tension
No lubrication
Correct source of contamination
Adjust belt tension
Check bearing seals
Knives moving in their
seats
There may be foreign matter on the
knives
Knife screws loose
Knife screws weakened
Carefully clean seat
Tighten screws with torque wrench
at values specified
Screws must not be used more than
6 times
Broken knife Improper resharpening
Extremely hard material
Incorrect rotor direction
Foreign body in the cutting chamber
Faulty fitting of screen
Check knife grinding method used
Contact supplier
Check rotor direction
Look for cause with operator
Check assembly procedure
Excessive knife wear Incorrect knife position
Improper knife re-sharpening
Abrasive material
Correct the gap or distance
between bed knives and rotor
knives
Check dimensions with Figure 14
and Figure 15.
Contact the supplier for special
knives
Abnormal screen wear Incorrect fitting of screen
Check that the screen is correctly
seated in its rear position and that it
fits perfectly at the front.
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