Airmar – Airmar Shorty™ with Valve—S300 User Manual

Page 4

1. Inspect the O-rings on the blanking plug (replace if necessary)

and lubricate them with the silicone lubricant supplied or
petroleum jelly (Vaseline®) (see Figure 3). The O-rings must be
intact and well lubricated for a watertight seal.

2. Remove the safety wire from the cap nut (see Figure 2).
3. To remove the paddlewheel insert from the housing, unscrew the

cap nut. This will jack the insert out of the housing. Do not unscrew
the screws. Replace the paddlewheel insert with the blanking plug.
Seat it into place with a pushing twisting motion until the key fits
into the notch in the housing. Screw the cap nut in place and hand
tighten only. Do not over tighten (see Figure 5).
NOTE: If the flap valves do not move freely and block the
blanking plug from being inserted, clean the valve assembly so
the flap valves move freely and rest against the valve housing.
In the unlikely event that the flap valves cannot be freed, you
may need to push the flap valves down or break them off.

4. Reattach the safety wire to the cap nut to prevent the insert

from backing out in the unlikely event that the cap nut fails or is
screwed on incorrectly (see Figure 2).

Winterizing

After the boat has been hauled for winter storage, remove the
blanking plug to let the water drain away before re-inserting it.
This will prevent any water from freezing around the blanking plug
and possibly cracking it.

Servicing the Paddlewheel Insert

Aquatic growth can impede or freeze the paddlewheel’s rotation
and must be removed. Clean the surface using a Scotch-Brite®
scour pad and mild household detergent. If fouling is severe, push
out the paddlewheel shaft using a spare shaft or a 4D finish nail
with a flattened point. Then, lightly wet sand the surface with fine
grade wet/dry paper.
The water lubricated paddlewheel bearings have a life of up to 5
years on low-speed boats [less than 10kn (11MPH)] and 1 year
on high-speed vessels. Paddlewheels can fracture and shafts can
bend due to impact with water borne objects and mishandling in
boat yards. O-rings must be free of abrasions and cuts to ensure
a watertight seal. A replacement Paddlewheel Kit 33-350-01 is
available.
1. Using the new paddlewheel shaft, push the old shaft out about

6mm (1/4"). With pliers, remove the old shaft (see Figure 5).

2. Place the new paddlewheel in the cavity with the flat side of the

blade facing the same direction as the arrow on the insert top.

3. Tap in the new shaft until the ends are flush with the insert.
4. Install one large and one small O-ring.
5. Place the remaining two O-rings in similar positions on the

blanking plug.

Sensor Replacement & Parts

The information needed to order a replacement Airmar sensor is
printed on the cable tag. Do not remove this tag. When ordering,
specify the part number and date. For convenient reference,
record this information on the top of page one.

Lost, broken, and worn parts should be replaced immediately.

Part

Airmar Part Number

Blanking Plug

20-288-01

Paddlewheel Kit

33-350-01

Cap Nut

04-011

Hull Nut

04-004

Housing (P371), Valve, and Hull Nut Kit

33-361-01

Obtain parts from your instrument manufacturer or marine dealer.

Gemeco

Tel: 803.693.0777

(USA)

Fax: 803.693.0477
Email: [email protected]

Airmar EMEA

Tel: +33.(0)2.23.52.06.48

(Europe, Middle East, Africa) Fax: +33.(0)2.23.52.06.49

Email: [email protected]

Figure 5. Maintenance

paddlewheel

small

housing

insert

O-ring

blanking

plug

cap nut

paddlewheel

flap valves

with valve

assembly

(flat side

of blade

faces bow)

notch

large

O-ring

detail

key

shaft

small

O-ring

AIRMAR

TECHNOLOGY CORPORATION

35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA

www.airmar.com

This manual is related to the following products:

Shorty™ with Valve—ST300