Chapter 1: St40 Speed Transducer; Changing A Paddlewheel - Raymarine ST40 Service Manual

Chapter 1, Speed Transducer
Chapter 1:

Changing a paddlewheel

ST40 Instruments Service Manual 83149-2
ST40 Speed Transducer
Insert (top view)
Arrow indicates
front of boat
Insert (side view)
Cap nut
Key
1, Paddlewheel shaft
Flat area of blade
faces front of boat
Housing (side view)
Keyway
Vane housing
(6, valve assembly)
Vane
(6, valve assembly)
Arrow indicates
front of boat
ST40 Speed transducer
To change a paddlewheel, refer to the ST40 Speed transducer illustration, and:
1. Use the new paddlewheel shaft from the spare parts kit to push out the old
shaft (1) approximately 5 mm (1/4 inch).
2. Grasp the end of the old shaft (1) with pliers and pull it straight out, to release the
paddlewheel (2).
3. Place the new paddlewheel (2) in the insert assembly cavity.
Pull ring
3, 'O' ring
4, 'O' ring
('O' rings should be
free of abrasions,
knicks, and cuts to
ensure watertight
integrity.)
2, Paddlewheel
5, Snap ring
Vane retainer pin
(6, valve assembly)
Spring
(6, valve assembly)
Hull
D4518-2
3 - 1