GEA Ariete NS3015P, Instruction Manual

Page: 315 / 337

IT
EN
Motor: see specific instructions.
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 rotating
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. 8.3)
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: obstruc-
ted filter, insufficient oil (exchanger) or water (coil) flow
rate, pump out of service, water temperature
.
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 effi-
ciency (pressure switchs, thermostats, flow indica-
tors, 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