Airmar ST200 - Manual (Page 4)

4
any petroleum residue inside the hull, remove it with either mild
household detergent or a weak solvent (alcohol) before sanding.
7. Proceed with “Bedding” and “Installing” on page 2.
Operation, Maintenance, Repair & Parts
Using the Blanking Plug
To protect the insert, use the blanking plug:
• When the boat will be kept in salt water for more than a week.
• When the boat will be removed from the water.
• When aquatic growth buildup is suspected due to inaccurate
readings from the instrument.
1. On the blanking plug, inspect the o-rings (replace if necessary)
and lubricate them with silicone grease or petroleum jelly (see
Figure 4). The o-rings must be intact and well lubricated to make
a watertight seal.
2. ST200—Remove the paddlewheel insert from the housing by
removing one safety ring and the retaining pin.
ST550—Remove the safety wire and unscrew the cap nut.
3. With the blanking plug ready in one hand, pull the paddlewheel
insert most of the way out using the pull ring. Remove the insert
and rapidly replace it with the plug. With practice, only 250ml
(10oz.) of water will enter the boat. Align the arrow on the top of
the plug facing forward toward the bow. Be sure to engage the
key in the notch. (Use a pushing twisting motion.)
4. Secure the blanking plug:
ST200—with the retaining pin and safety rings.
ST550—with the cap nut and safety wire.
Servicing the Paddlewheel Insert
ST550 converts to low-speed or high-speed operation simply by
changing the paddlewheel. The low-speed paddlewheel is
optimized for speeds up to 40kn (46MPH) and the high-speed
paddlewheel is designed for speeds up to 50kn (57MPH).
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 10 kn (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.
1. Using the new paddlewheel shaft, push the old shaft out about
6mm (1/4"). With pliers, remove the old shaft (see Figure 4).
2. Place the new paddlewheel in the cavity with the flat side of the
exposed blade facing the same direction as the arrow on the
top of the insert.
3. Tap the new shaft into place until the ends are flush with the
insert.
4. Install two o-rings.
5. The remaining o-rings are placed in a similar position on the
blanking plug.
Replacement Transducer & Parts
The information needed to order a replacement Airmar transducer
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.
If you have purchased a plastic housing and have a wood hull or
desire greater strength, purchase a metal housing. Lost, broken, or
worn parts should be replaced immediately.
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]
Model Blanking
Plug
Cap Nut Hull Nut
Housing &
Hull Nut
Paddle-
wheel Kit
ST200 33-412 — 04-002 —
33-114
(see Fig. 5)
ST550 33-414
04-234-1 (plastic)
02-131-01 (bronze) 04-004 (plastic)
02-030 (bronze) 33-100
(bronze B17)
Figure 5. ST200:
Copyright © 1994 - 2011 Airmar Technology Corp. All rights reserved.
AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
www.airmar.com
Copyright © 1997 Airmar Technology Corp.
Paddlewheel Kit 33-114
Figure 4. ST550: Replacing
o-rings
arrow
flat side
of blade
pull ring
shaft
Copyright © 1997 Airmar Technology Corp.
paddlewheel and o-rings
faces bow
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