RDG603A63 - Issue 10
Page 40 of 104
21. Hydraulic Drive Transmissions
If an engine is to have a hydraulic drive transmission attached to it instead of a conventional
marine gearbox, a number of points must be observed.
•
Bobtail engines (i.e. Engines supplied without a marine gearbox), normally do not have
a gearbox oil cooler fitted. However if a cooler is supplied, this will only be suitable to
cool a conventional marine gearbox.
•
Hydraulic drive transmissions generate far more heat than a conventional marine
gearbox. Therefore, the size of the oil cooler installed must be calculated by the
hydraulic drive transmission supplier. This is to ensure it has sufficient cooling capacity
and is sized appropriately taking into account:
•
Maximum engine power.
•
High ambient summer air temperature.
•
Summer River/Canal/Sea temperature.
•
No additional restriction to engine coolant flow is present.
Skin tanks will also need to be increased by up to approx. 10% to dissipate the additional
heat generated, when a hydraulic drive system or hydraulic bow thruster is used.
Or
An additional separate skin tank of suitable capacity with separate water circulating pump
may need to be fitted for a hydraulic drive transmission.
Hydraulic oil coolers should be installed after the engine, not before. Coolers
that are installed before the engine will invalidate the engine warranty.
22. 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
