Chapter 5: Installing the ST4000+ 735 Installing the ST4000+Securing the sensor to the boatLocationMount the rudder position sensor on a suitable base alongside therudder stock and tiller arm.Note: If necessary, you can install the sensor upside down. If youmount the sensor in this way, you must swap the red and green cableconnections at the control unit.Securing the rudder position sensor1. Hold the sensor in place, mark the mounting holes, then removethe sensor (if required, use the template supplied).2. Drill the pilot holes using a 3 mm (1/8 in) drill bit.3. Attach the sensor to the mounting base using the threeself-tapping screws supplied (pan-head No 8 x 3/4 inch).Note: To make minor adjustments to the sensor alignment, loosen thescrews, rotate the sensor body, then re-tighten the screws.Attaching the sensor to the tiller armAttaching the tiller pin to the tiller arm1. For optimum performance, mount the tiller pin on the tiller arm140 mm (5.5 in) from the rudder stock center line.Note: If necessary, you can fit the tiller pin anywhere between101 mm (4 in) and 190 mm (7.5 in) from the rudder stock. This willnot affect autopilot performance, but will slightly alter the scaling ofthe rudder angle display shown on the control unit.2. Hold the tiller pin in place (either along or across the tiller arm),mark the mounting holes then remove the tiller pin.3. Drill pilot holes using a 3 mm (1/8 in) drill bit.4. Attach the tiller pin to the tiller arm using the two self-tappingscrews supplied (countersunk No 8 x 3/4 inch) or suitable bolts,nuts and lock washers.81131_7.book Page 73 Wednesday, March 17, 2004 3:59 PM
