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14
Drive sprocket
To stop the drive sprocket rotating on the drive shaft, the shaft has a
inch square projection (a woodruff key) that fits into a notch (or keyway)
at the centre of the sprocket. If you use a non-Raymarine drive sprocket,
its bore and keyway dimensions must fall within the ranges specified in
Figure 4
for it to lock correctly to the drive shaft.
Attaching drive and steering sprockets
Each sprocket must be keyed and then screwed to the shaft with a grub screw secured with
Note:
thread-locking compound.
Checking sprocket alignment and chain tension
Aligning drive and steering sprockets
Both sprockets must be accurately aligned to run in the same plane when viewed from the
side. Check for correct alignment by holding a straight edge between the edge of the
Figure 5
sprockets (see
CAUTION
3.22 mm – 3.24 mm
(0.127 in – 0.1275 in)
keyway
grub screw
19 mm
(0.75 in)
Figure 4: Sprocket bore and keyway dimensions
).
15.89 mm – 15.9 mm
(0.6256 in – 0.6275 in)
bore
9.46 mm – 9.61 mm
(0.3725 in – 0.3785 in)
12.7 mm
(0.5 in)
D5084-1
1
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8
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