Raymarine ST40 - Chapter 1: ST40 Speed Transducer; Changing a Paddlewheel

Chapter 1, Speed Transducer
ST40 Instruments Service Manual 83149-2 3-1
Speed
Transducer
Chapter 1: ST40 Speed Transducer
H
A
N
D
T
I
G
H
T
E
N
Hull
Insert (top view)
Insert (side view)
Housing (side view)
5, Snap ring
Vane retainer pin
(6, valve assembly)
Vane
(6, valve assembly)
Keyway
Pull ring
3, 'O' ring
4, 'O' ring
('O' rings should be
free of abrasions,
knicks, and cuts to
ensure watertight
integrity.)
Key
Flat area of blade
faces front of boat
Arrow indicates
front of boat
1, Paddlewheel shaft
2, Paddlewheel
D4518-2
Arrow indicates
front of boat
Vane housing
(6, valve assembly)
Spring
(6, valve assembly)
Cap nut
ST40 Speed transducer
Changing a paddlewheel
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.