- If the gear unit is filled with storage oil, it has to be drained and it is strongly advised to rinse the gear unit with
the selected oil before starting up. Check with the oil supplier.
- To improve the steadiness of the bearing life span, 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.
7.6. GREASE SELECTION (see table page 39)
If the gear unit is equiped with parts that need grease lubrication, and unless indicated otherwise on the gear
unit's name plate or in the special technical manual of the specific gear unit (if existing), the grease must be
selected from the table at page 39 of this service manual, listing mineral oils and greases recommended by their
respective brand name owners.
Use only high quality greases with consistency NLGI-Grade 3.
Greases with consistency NLGI-Grade 2 may be used for regreasable labyrinth type seals and grease lubricated
lower bearing of the low speed shaft.
The lubricant suppliers are responsible for the selection and composition of their products.
7.7. GREASE LUBRICATION POINTS (see fig. 5)
All greasing points for bearings which are not oil lubricated and for labyrinth seals are equipped with nipples ac-
cording to DIN 71412 and have been filled before shipment.
The total number of nipples is indicated on the nameplate.
7.8. OIL DRAINING (see fig. 5)
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.
To facilitate oil draining, remove the dipstick. Units having a large oil volume can be drained easier through the
drain plug when using a portable pump. With some executions a small quantity of oil remains beneath the high
speed bearings. This oil can be drained by means of a second drain plug (1), see fig. 5 page 29.
8. VENTILATION (see fig. 5)
To prevent pressure build-up, the gear unit is provided with a breather which is integrated in the dipstick or with a
separate breather (normal, anti-dust or anti-humidity breather).
Take care and check regularly that this breather does not become clogged.
9. COOLING
Heat generated in the gear unit due to friction and churning of the oil, must be dissipated through the housing in-
to the environment. It is important not to decrease the heath dissipation capacity of the housing.
Regularly clean the surface of the housing.
The temperature of the oilbath will rise with increased load. Continuous operating temperature of 80 to 85°C
(175 to 185°F) is allowable for a standard gear unit filled with mineral oil.
Occasional operating temperatures of up to 95°C (200°F) are acceptable.
9.1. ADDITIONAL AIR COOLING
9.1.1. Fans
One or two fans may be mounted on gear unit shafts.
Warning
Do not run the gear unit without appropriate protection covers.
Check regularly that the air inlet and the air outlet are not obstructed.
Fans need no special maintenance, except occasional cleaning.
ENGLISH
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