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UTD.187.2019.09.00_EN Operating instructions G series
12 - Gear reducer troubles: causes and corrective actions
See specific motor documentation.
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.
Trouble Possible causes Corrective actions
Excessive oil
temperature
Inadequate lubrication:
– excessive of insufficient oil quantity
– unsuitable lubricant (different type, too viscous, exhausted,
etc.)
Check
– oil level (gear reducer at rest) or quantity
– lubricant type and/or state (see ch. 6.2, lubrication
table) and replace if necessary
Incorrect mounting position Change the mounting position
Too tightened taper roller bearings Consult Rossi
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, etc.
Check the pump, the pipes, the oil filter and safety
devices efficiency (manostats, thermostats, etc.)
Anomalous noise One or more teeth with
– dents or spallings
– excessive flanks roughness
Consult Rossi
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. 11.4)
Damaged rotating seating (scoring, rust, dent, etc.) Restore the seating
Mounting position differs from the one stated on the name
plate
Correctly position the gear reducer
Oil leaking from filler
plug
Too much oil Check oil level/quantity
Incorrect mounting position Check mounting position
Inefficient vent valve Clean/replace filler plug with vent valve
Low speed shaft not
rotating even if high
speed shaft or motor
are running
Broken key Consult Rossi
Completely worn gear pair
Lubricant leaking from
joints (covers or half-
housing joints)
Defective oil seals Consult Rossi
Water in the oil Defective cooling coil or heat exchanger Consult Rossi
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