Amel Super Maramu 2000

Main Mast Furler Box Transmission Leroy Somer vs Bonfiglioli Leroy Somer Mini Bloc MVA (I believe model M33C with 1/60 reduction but have also seen on the forum MVA-60-NJ-M-H-M) Leroy Somer Mini Bloc MVA (4.3 MB .pdf) Bonfiglioli Model VF44 with configuration P1 70 P63 B14 B3 70:1 reduction

Overhaul the Bonfiglioli is a ittle bigger.

The first issue I see is the position of the holes attaching the electric motor
They are 3 on the Leroy Sommer and 4 on the Bonfiglioli, therefore they are at a different angle.

Side by side

On the Leroy Somer the distance between the holes is 65 mm

The Bonfiglioli will have to be drilled to match the Leroy Somer

The shaft from the electric motor was 10 mm on the Leroy Somer

And 10 mm as well on the Bonfiglioli

The shaft space for the winch on the boom (for the outhaul) was difficult to measure, but over 19 mm on the Leroy Somer

On the Bonfiglioli the shaft space was only 16 mm
The inside will have to be machined to be enlarged to 19 or so mm
unless the shaft itself is reduced to 16 or so mm to fit inside the Bonfiglioli

The width of the 4 bolts holding the transmission (and its electric motor was 60 mm on the Leroy Somer

And it was also 60 mm on the Bonfiglioli

Another concern was how long were the bolts on the Bonfiglioli

Fairly short

With plenty of space to bolt a longer bolt (as these hold the transmission to the boom)

These are size 5 mm .80 thread

Here are different views of these 4 bolts

Not knowing the proper sequence, some bolts have been removed already on the picture

Another view