RDG603A20 - Issue 10 Page 40 of 100checked all round. TIGHTENING TORQUE (M12x40) is 79NmThe tightening of the connecting screws between the clamping bush and thehub means that the clamping hub/propeller shaft will be dragged into the coupling bya few millimetre’s, thereby effectively shortening the installation length. Sufficient freespace (minimum 10mm) should be available between the outer bearing and thepropeller hub.The propeller-thrust (or propeller-pull in reverse drive) is safely transmitted via the couplingfrom the propeller shaft to the gearbox, but the design of the coupling is such that the rubbermust be compressed when sailing in the forward direction. The coupling is not suitable foruse with vee-drive gearboxes having outputs of the quill-shaft arrangement where thecoupling would be subject to a pulling force when sailing forward.The coupling uses a bonded rubber element, and care should be taken not to contaminatethe rubber by indiscriminate use of solvents or anaerobic liquids.24. PRM 280DP Gearbox with Power Take Off (Option)The PRM 280 with power take off is designed for driving hydraulic pumps made to SAEJ77Series B specification. The maximum power which can be transmitted is 22kW (29.5hp) per1000rpm.The power take off operates in the opposite direction to the gearbox inputshaft. The output of the live power take off is the same speed as the engine.
