39
ROSSI
GEARMOTORS
UT.D 123 rev. 3
Motor: see specific instructions.
NOTE
When consulting ROSSI MOTORIDUTTORI 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 MOTORIDUTTORI.
Trouble
Possible causes
Corrective actions
19 - Gear reducer troubles: causes and corrective actions
Excessive oil temperature
Anomalous noise
Lubricant leaking
from seal rings
Oil leaking from filler plug
Low speed shaft not rotating
even with high speed shaft/
motor running
Lubricant leaking from
joints (covers or
half-casing joints)
Water in the oil
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 ex cessive load during
running -in
– Excessive ambient tempe rature
Check:
– oil level (gear reducer at rest) or quantity (see
ch. 20)
– lubricant type and/or state (see ch. 6.2 lubrication
table); replace if necessary
– Change mounting position
Consult ROSSI MOTORIDUTTORI
Reduce the load
Increase the cooling or correct the ambient temperature Inef-
ficiency of auxiliary bearing lubrication system
Check the pump and the pipes
Inefficient or out of service oil cooling system: obstruc-
ted filter, insufficient oil (exchanger) or water (coil) flow
rate, pump out of service, water temperature > 20 °C
Check pump, pipes, oil filter and safety devices effi-
ciency (pressure switchs, thermostats, fluxmeters,
etc.)
One or more teeth with:
– dents or spallings
– excessive flanks roughness
Consult ROSSI MOTORIDUTTORI
Worn, faulty or badly lubricated bearings
Consult ROSSI MOTORIDUTTORI
Taper roller bearings with ex cessive clearance
Consult ROSSI MOTORIDUTTORI
Vibrations
Check the fastening and the bearings
Seal ring with worn, bakelized, damaged or false
mounted seal lip
Replace seal ring (see ch. 8.3)
Damaged raceway surface (scoring, rust, dent, etc.)
Restore the raceway
Mounting position differs from the one stated on the
name pla te
Too much oil
Incorrect mounting position
Position the gear re ducer correctly (see ch. 13)
Check oil level/quantity (see chapter 13)
Check mounting position (see chapter 13)
Inefficient vent valve
Clean/replace filler plug with vent valve
Broken key
Completely worn gear pair
Consult ROSSI MOTORIDUTTORI
Defective oil seals
Consult ROSSI MOTORIDUTTORI
Defective cooling coil or heat exchanger
Consult ROSSI MOTORIDUTTORI
Worn, faulty or badly lubricated bearings
Consult ROSSI MOTORIDUTTORI
Obstructed passage of air
Eliminate obstructive material
Slow or missing air recycle
Arrange auxiliary ventilation
Radiance
Screen gear reducer and motor properly
