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TROUBLESHOOTING
SECTION 7-3
Mechanical Faults
PROBLEM
Mechanical Faults
PROBABLE CAUSE REMEDY
1. Excessive wear on the V-
Belt drive
1. Check belt tension and
adjust as necessary
2. Inadequate lubrication 2. Check lubrication frequency
and the recommended
lubricants in motor and rotor
bearings
A. Bearing overheating
3. Dirt/Contamination in
bearing
3. Eliminate source of
contamination
B. Visible cracks in knives 1. Incorrect grinding
procedure or incorrect
grinding wheels in use
1. Check grinding procedures
and contact a Cumberland
Service Engineer
1. Uneven knifes seat surfaces 1. Clean knife seats to provide
maximum bearing surface
2. Loose knife screws 2. Tighten to correct torque,
per section 4
C. Knives moving on seats
3. Stretched knife screws 3. Knife screws should not be
used more than six times.
Renew them if there is
evidence of stretching
1. Possibly due to cracks
caused by incorrect grinding
1. Refer to problem B.
“Visible cracks in knives”
(above left)
2. Abnormally heavy material 2. Contact a Cumberland
Service Engineer
D. Knives breaking
3. Contaminated input
material
3. Inspect the material for
contaminates and foreign
matter
1. Open knife setting 1. Reset as detailed in
alternate material
E. Excessive knife wear
2. Abrasive materials 2. Contact a Cumberland
Service Engineer
1. Incorrectly seated 1. Check that the screen is
seated correctly and fully on
its cradle
F. Screens wearing
2. Abrasive materials being
granulated
2. Obtain special alloy or heat
treated screens