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Yanmar Pleasure Boat Marine Engine Help
Overview - Front Power Takeoff
A front power takeoff is often used to drive a refrigeration compressor, water-maker compressor, additional alternators, a hydraulic winch pump, etc. As excessive side loads may break the crankshaft, the Yanmar recommended MAXIMUM FRONT PTO at various rpm for individual engine models can be calculated HERE.
The left hand 'A' type drive drawn below shows a support frame mounted integrally with the engine, this is OK.
Keep the angle within 30deg of the horizontal.
'A' type, side view showing the dimension, 'Overhang (L)' required to calculate the allowable load.
'A' type, top view
This 'A' type pto below should have had the excess pulleys machined off. The additional weight of the alternator on this larger engine (6CX-ETE) is insignificant and does not affect the mount.
'D' type couple can handle more horsepower as the crankshaft is supported.
Installation Tips - Front Power Takeoff