Rossi MR Series User Manual

10
Table of tightening torques for fastening screws
bolts (foot, flange and cover lids)
Bolt
M [N m]
UNI 5737 - 88
class 8.8 class 10.9
M 4
3 4,3
M 5
6 8,5
M 6
11 15
M 8
25 35
M10
50 71
M12
85 120
M16
205 290
Trouble Possible causes Corrective actions
Excessive oil temperature Inadeguate lubrication:
– excessive or insufficient oil quantity
– unsuitable lubricant (different type, too viscous,
exhausted, ecc.)
– Wrong mounting position
– Excessive ambient temperature
Check:
– oil level (gear reducer at rest) or quantity
–
lubricant type and/or state; replace if necessary
– change mounting position
– increase the cooling or correct the ambient tem-
perature
Obstructed passage of air Eliminate obstructive material
Slow or missing air recycle Arrange auxiliary ventilation
Radiance Screen gear reducer and motor properly
Worn, faulty or badly lubricated bearings Consult ROSSI MOTORIDUTTORI
Anomalous noise
One or more teeth with:
– dents or spallings
– excessive flanks roughness
Consult ROSSI MOTORIDUTTORI
Worn, faulty or badly lubricated bearings
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
Damaged raceway surface (scoring, rust, dent,
etc.)
Restore the raceway
Mounting position differs from the one stated on
the name plate
Position the gear reducer correctly
Too much oil Check oil quantity
Low speed shaft not rotating
even with high speed shaft/motor
running
Broken key Consult ROSSI MOTORIDUTTORI
Completely worn gear pairs
Lubricant leaking from cover lids
Defective oil seals Consult ROSSI MOTORIDUTTORI
Gear reducer troubles:causes and corrective actions
Motor: see specific instructions.
NOTE
When consulting ROSSI MOTORIDUTTORI state:
– all data of gearmotor name plate;
– nature and duration of failure;
– when, under which conditions, and in which way (systematically or occasionally) 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.
Notes
- Class 8.8 is usually sufficient (gearmotors are supplied with screws and bolts
class.8.8).
-
Before tightening the bolt be sure that the centering of flanges are inserted properly
- The bolts are to be diagonally tightened with the maximum tightening torque.

Rossi MR Series Specifications

General

Brand	Rossi
Model	MR Series
Category	Engine
Language	English