25
Rossi
Operating instructions − UTD.045.06-2013.00_TR_EN
TR
EN
Motor: see specific documentation.
NOTE
When consulting Rossi state:
– all data of gear reducer or gearmotor name plate;
– nature and duration of failure;
– when and under which conditions the failure occured;
– during the warranty period, in order not to loose validity, do not disassemble nor tamper the gear reducer or gearmotor without approval
by Rossi.
Trouble
Possible causes
Corrective actions
Gear reducer troubles: causes and corrective actions
Excessive oil temperature
Damaged raceway surface (scoring, rust, dent, etc.)
Position the gear re ducer correctly
Clean/replace filler plug with vent valve
Low speed shaft not rota-
ting even with high speed
shaft/motor running
Consult Rossi
Consult Rossi
Vibrations
Check the fastening and the bearings
Lubricant leaking
from seal rings
Seal ring with worn, bakelized, damaged or false
mounted seal lip
Replace seal ring (see ch. 9.3)
Restore the raceway
Mounting position differs from the one stated on the
name pla te
Inadequate lubrication:
– excessive or insufficient oil quantity;
–
unsuitable lubricant (diffe
rent type, too viscous,
ex hausted, etc.)
wrong mounting position
Too tightened taper roller bearings
Worm gear reducer with excessive load during
running-in
Excessive ambient tempe rature
Check:
– oil level (gear reducer at rest) or quantity
– lubricant type and/or state (see ch. 6.2 lubrication
table); replace if necessary
Change mounting position
Consult Rossi
Reduce the load
Increase the cooling or correct the ambient temperature
Inefficiency of auxilia ry bearing lubrication
system
Check the pump and the pipes
Inefficient or out of service oil cooling system:
obstructed filter, insufficient oil (exchanger) or water
(coil) flow rate, pump out of service, water tempera-
ture
.
20 °C, etc.
Oil leaking from filler plug
Too much oil
Check oil level/quantity
Incorrect mounting position
Check mounting position
Check pump, pipes, oil filter and safety devices
efficiency (pressure switchs, thermostats, flow indi-
cators, etc.)
Anomalous noise
Inefficient vent valve
One or more teeth with:
– dents or spallings
– excessive flanks roughness
Consult Rossi
Worn, faulty or badly lubricated bearings
Broken key
Completely worn gear pair
Consult Rossi
Lubricant leaking from
joints (covers or
half-casing joints)
Defective oil seals
Consult Rossi
Taper roller bearings with ex cessive clearance
Worn, faulty or badly lubricated bearings
Consult Rossi
Obstructed passage of air
Eliminate obstructive material
Slow or missing air recycle
Arrange auxiliary ventilation
Radiance
Screen gear reducer and motor properly
Consult Rossi
Water in the oil
Defective cooling coil or heat exchanger
