Maintenance
9
9.1
General
At machine rest
, verify at regular intervals (more or less frequently according to environment and use):
•
all external surfaces are clean and air passages to the gear reducer or gearmotor are free, in order that cooling remains fully
eff ective;
•
oil level and deterioration degree (check with cold gear reducer at rest);
•
correct fastening screws tightening.
During the operation
check:
•
noise level;
•
vibrations;
•
seals;
•
etc.
Attention!
After a running period, the gear reducer is subject to a light internal overpressure which may cause burning liquid
discharge. Therefore, before loosening whichever plug (fi ller plug included) wait until gear reducer has become cold,
if this is not possible, use appropriate protection against burns resulting from contact with hot oil.
In all cases, always proceed with great care.
The maximum oil temperatures indicated in the lubrication table (see ch. 6.2) will not impair proper functioning of the gear reducer.
9.2
Oil change
Execute the oil change with the
machine at rest and cold
gear reducer.
Pre-arrange a proper waste oil collection system, unscrew the drain plug and the fi ller plug in order to facilitate the draining;
dispose of the waste lubricant according to the laws in force.
wash the inside part of gear reducer housing using the same oil type suitable for the running; the oil used for this wash can be
applied for further washings after proper fi ltering by 25 µm of fi ltration standard;
Fill the gear reducer with oil again up to level.
During the oil change, replace the seal rings.
When dismounting the cap (whenever gear reducers are provided with), reset the sealing with adhesive on cleaned and degreased
mating surfaces.
For lubrication interval see ch. 6.2.
Apart from running hours:
•
replace mineral oil at least each 3 years;
•
replace or regenerate synthetic oil each 5 - 8 years according to gear reducer size, running, and environmental conditions.
Never mix diff erent makes of synthetic oil; if oil change involves switching to a type diff erent from that used hitherto, then give the
gear reducer a thorough clean-out.
For bearings lubricated with "lifetime" grease, it is not strictly necessary to replace the grease. However, during maintenance
operations in which the bearings are accessible, it is always advisable to check and, if necessary, top up the grease.
28
UT.D 208-2021.12-EN
