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UTD.123.2019-10.00_EN
13.8 - Gear reducer troubles: causes and corrective actions
Trouble
Possible causes
Corrective actions
Excessive oil temperature
Inadequate lubrication:
Check:
– excessive of insufficient oil quantity
– oil level (gear reducer at rest) or quantity
(see ch. 15 ... 20)
– unsuitable lubricant (different type, too viscous,
exhausted, etc.)
– lubricant type and/or state
(see table 8.3) and eventually replace it
– wrong mounting position
– change mounting position
– too tightened taper roller bearings
Consult Rossi
Worm gear reducer with ex cessive load durino
running -in
Reduce the load
Excessive ambient temperature
Increase the cooling or correct the ambient
temperature
Obstructed passage of air
Eliminate obstructive material
Slow or missing air recycle
Arrange auxiliary ventilation
Radiance
Screen gear reducer and motor properly
Inefficiency of auxiliary bearing lubrication
system
Check the pump and the pipes
Bearings failure, defect or bad lubrication
Consult Rossi
Inefficient or out of service oil cooling system:
obstructed filter, insufficient oil (exchanger) or
water (coil) flow rate, pump out of service, water
temperature > 20 °C
Check the pump, the pipes, the oil filter
and safety devices efficiency (manostats,
thermostats, etc.)
Anomalous noise
One or more teeth with
Consult Rossi
– dents or spallings
– excessive flanks roughness
Bearings failure, defect or bad lubrication
Consult Rossi
Taper roller bearings with excessive clearance
Consult Rossi
Vibrations
Check the fastening and the bearings
Lubricant leaking from seal ring
Seal ring with worm, bakelized, damaged or false
mounted seal lip
Replace seal ring (see ch. 13.4)
Damaged raceway surface (scoring, rust, dent,
etc.)
Restore the seating
Mounting position differs from the one stated on
the name plate
Correctly position the gear reducer
(see ch. 15 ... 20)
Oil leaking from filler plug
Too much oil
Check oil level or quantity
(see ch. 15 ... 20)
Incorrect mounting position
Check mounting position
(see ch. 15 ... 20)
Inefficient vent valve
Clean/replace filler plug with vent valve
Low speed shaft not rotating
even with high speed shaft/
motor running
Broken key
Consult Rossi
Completely worn gear pair
Consult Rossi
Lubricant leaking from joints
(covers or half-casing joints)
Defective oil seals
Consult Rossi
Water in the oil
Defective cooling coil or heat exchanger
Consult Rossi
Motor: see specific instructions.
NOTE
When consulting Rossi state:
– all data on gear reducer or gearmotor name plate;
– failure nature and duration;
– 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.
Содержание Rossi A Series
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