RDG603A63 - Issue 10
Page 41 of 104
length. Centa recommend the use of M10 x 25 screws or M10 x 40 studs. If using
studs the shorter (10mm) screwed portion should be inserted into the coupling.
TIGHTENING TORQUE IS 45Nm
•
Push the clamping hub fully onto propeller shaft.
•
Connect the clamping hub/propeller shaft onto the coupling. The connecting screws
of the clamping bush must be tightened alternately in several steps until the required
tightening torque is reached. Finally, the tightening torque of all fasteners must be
checked all round.
TIGHTENING TORQUE (M12x40) is 79Nm
The tightening of the connecting screws between the clamping bush and the
hub means that the clamping hub/propeller shaft will be dragged into the coupling by
a few millimetre’s, thereby effectively shortening the installation length. Sufficient free
space (minimum 10mm) should be available between the outer bearing and the
propeller hub.
The propeller-thrust (or propeller-pull in reverse drive) is safely transmitted via the coupling
from the propeller shaft to the gearbox, but the design of the coupling is such that the rubber
must be compressed when sailing in the forward direction. The coupling is not suitable for
use with vee-drive gearboxes having outputs of the quill-shaft arrangement where the
coupling would be subject to a pulling force when sailing forward.
The coupling uses a bonded rubber element, and care should be taken not to contaminate
the rubber by indiscriminate use of solvents or anaerobic liquids.
23. PRM 280DP Gearbox with Power Take Off (Optional Extra)
The PRM 280 with power take off is designed for driving hydraulic pumps made to SAEJ77
Series B specification. The maximum power which can be transmitted is 22kW (29.5hp) per
1000rpm.
The power take off operates in the opposite direction to the gearbox input
shaft. The output of the live power take off is the same speed as the engine.
24. Engine Start Battery
For the required specification of the Engine Start Battery, please refer to
Section 10
–
Technical Data.
