8 - PROPULSION SYSTEM 268
8.12 GEAR BOX
The main functions of a marine gearbox are the following:
• Couple the engine with the propeller shaft and reduce the number of
revolutions of the propeller;
• Reverse the motion direction;
• Interrupt the propeller shaft motion (idle).
The gear boxes are provided with several documents.
We suggest you to read the operating instruction manual carefully and in
detail.
8.12.1 Gearbox check
Oil level check
Check the oil level only when the engine is at a standstill. The proper oil level
is between the upper and the lower notch of the dipstick.
After the rst oil lling, a repair or the cleaning of the oil lter, the gearbox
must be run for about two minutes.
Next the oil level check has to be carried out again two minutes after the
engine has stopped.
CAUTION
Before starting checking the oil level, check that the gearbox oil tempera-
ture complies with the normal operating specications.
ENVIRONMENT
Recover waste oil following the norms in force, relevant to special waste
disposal.
It is possible to drain the used oil from the propulsion engines by using a
manual pump activated by means of the relevant lever.
DANGER
Service the gear box only if engine and propellers are stopped and the
thermal switch is OFF. Before starting the inverter, carry out the lling
and the consequent check of the oil level. The use of the gearbox with a
low quantity of oil may damage the gears. An excess of oil might cause
leaks to the seals and to the vent and increase remarkably the operating
temperature.
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