11.3. GEAR UNITS EQUIPPED WITH HEATERS
Gear units equipped with heaters must not be started before the oil temperature is above 5°C (40°F). Heaters
have to be switched off automatically when the oil temperature is above 15°C (60°F).
11.4. GEAR UNITS WITH FORCED FEED LUBRICATION
For the different parts of the lubrication system, refer to the service manual of the lubrication and cooling equipment
and/or the technical leaflets concerning the specific components.
11.5. GEAR UNIT DRIVEN BY A TWO SPEED MOTOR
When switching from the higher to the lower speed, first decelerate to below the lower speed so that the motor
has to accelerate when switched on at the lower speed. In this way high synchronisation peak torques can be
avoided.
12. MAINTENANCE
Refer to the MAINTENANCE TABLE on page 7.
Read carefully all paragraphs of chapter 12.
Read also the points in the other paragraphs.
12.1. INSPECTION AND MAINTENANCE
Rotating parts may cause injuries and damage.
For inspection and maintenance always de-energize the drive and make sure that the gear unit and
the drive are externally secured against unintentional switch-on or movement.
12.2. OIL CHANGE AND REGREASING THE LUBRICATION POINTS
12.2.1. General directives
Handle any lubricant or oil with care and according to the handling and safety instructions to be sup-
plied by the lubricant supplier on customer's request. These instructions have to be handed over to any
personnel performing installation, maintenance or repair of the gear unit.
Use clean oil from clean barrels. Avoid any penetration of abrasive particles and water. The water content should
be no higher than 0.05% (derived following titration method accepted by the oil manufacturer).
To improve the steadiness of the bearing life time, it is highly recommended to use oil that has an initial oil
cleanliness of -/15/12 (or better) according to ISO 4406.
Refer to the oil supplier to obtain this oil quality.
It is recommended to change the oil before summertime, hence running with fresh oil in the most
critical period when thermal load is higher.
If the gear unit is provided with a heater, disconnect the heater from the electric supply before draining
the oil.
Drain the oil while the gear unit is still warm. Be careful while draining the hot oil. Use an appropriate hot oil
recipient, heat resistent clothing and gloves to avoid burns.
Every time the lubricant is changed, it is recommended to flush the gear unit and the corresponding lubrication
and cooling system with fresh oil. Check to make sure that the gear unit, the lubrication and cooling system items
are well drained after flushing .
Don't forget to renew the filter cartridge.
Operating procedure and specifications are mentioned in the service manual of the lubrication and cooling
equipment and / or the technical leaflets for the specific instrumentation.
Disposable filter cartridges can not be cleaned.
External dipsticks and sight glasses must be periodically checked against the gear unit dipstick.
ENGLISH
33
32
6