RDG603A73 - Issue 3
Page 36 of 96
20. Centa Coupling CF-M-160 (RDG2779)
Centa have given Barrus permission to use the following instruction on how to fit the coupling:
When assembling the coupling all the bolts and nuts must be tightened to the correct torque
using a torque wrench.
Tightening by “feel” will not give a satisfactory result.
•
Remove the clamping bush from the coupling.
•
Degrease the propeller shaft and the bore of the clamping hub. Leave the special
grease only in the tapered bore of the coupling hub, and on the outside of the clamping
hub.
DO NOT USE SOLVENTS.
•
Mount the coupling onto the gearbox output flange. Note: The M10 tapped holes in
the coupling are 15/17mm, so care must be taken to use screws or studs of the correct
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.
21. 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
