Raymarine Autohelm 100, Install Manual

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50 TYPE 100/300 Operation and Installation Handbook
9.46mm – 9.61mm
(0.3725in – 0.3785in)
3.22mm – 3.24mm
(0.127in – 0.1275in)
15.89mm – 15.9mm
(0.6256in – 0.6275in)
19mm
(0.75in)
12.7mm
(0.5in)
Grub screw
D758-1
The drive unit must be bolted to a substantial frame member. The
mounting foot is secured to the drive unit by four equally spaced allenhead
screws and it may be rotated through 90 degrees to provide a more
convenient mounting position, if required. In some cases it may be
necessary to fabricate a special frame to mount the drive unit.
It should be noted that chain tension can exceed 500 lb (230Kg) and,
therefore, an extremely rigid mounting structure is vital to maintain good
chain alignment. Installation failures can occur in this area and over-
engineering is strongly recommended for drive unit mounting. All
fastenings should be secured with lock washers.
Provisions must also be made for chain adjustment. This is achieved by
removable shims placed under the mounting foot or, alternatively, by
elongated clearance holes in the mounting frame.