Gear reducer troubles: causes and corrective actions 10
Trouble
Possible causes
Corrective actions
Excessive temperature
of oil
Inadequate lubrication:
– excessive of insuffi cient oil quantity
– unsuitable lubricant (diff erent 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
Ineffi ciency of auxiliary bearing lubrication
system
Check the pump and the pipes
Bearings failure, defect or bad lubrication
Consult Rossi
Ineffi cient or out of service oil cooling
system: obstructed fi lter, insuffi cient oil
(exchanger) or water (coil) fl ow rate, pump
out of service, water temperature > 20 °C
Check the pump, the pipes, the oil fi lter
and safety devices effi ciency (manostats,
thermostats, etc.)
Abnormal noise
One or more teeth with
— dents or spallings
— excessive fl anks 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 raceway surface (scoring, rust,
dent, etc.)
Restore the seating
Mounting position diff ers from the one stated
on the name plate
Correctly position the gear reducer
Oil leaking from fi ller plug
Too much oil
Check oil level/quantity
Incorrect mounting position
Check mounting position
Ineffi cient vent valve
Clean/replace fi ller 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
See specifi c motor documentation.
NOTE
When contacting Rossi S.p.A. please indicate:
•
all data on gear reducer or gearmotor name plate;
•
failure nature and duration;
•
when and under what conditions the failure happened;
•
during the warranty period, in order not to loose validity, do not disassemble nor tamper the gear reducer or gearmotor
without approval by Rossi.
32
UT.D 208-2021.12-EN
