Airmar ST600 - Manual (Page 4)

pushing twisting motion until the key fits into the notch. Screw
the cap nut in place. Hand-tighten only. Do not over tighten.
5. Reattach the safety wire to prevent the insert from backing out in
the unlikely event that the cap nut fails or is screwed on incorrectly.
Cleaning the Paddlewheel
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.
Replacing the Paddlewheel & O-rings
The water lubricated paddlewheel bearings have a life of up to 5
years on low-speed boats [less than 10kn (11 MPH)] 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 & Valve Kit 33-250
is available (see Figure 5).
1. Using the new paddlewheel shaft, push the old shaft out about
6mm (1/4"). With pliers, remove the old shaft (see Figure 6).
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 the new shaft into place until the ends are flush with the insert.
4. Install a large o-ring near the pull ring, a medium o-ring below it,
and a small o-ring near the paddlewheel.
5. Place the three remaining o-rings in similar positions on the
blanking plug.
Servicing the Valve Assembly
Should the valve fail, remove it for servicing.
1. On the blanking plug, inspect the o-rings (replace if necessary)
and lubricate them with the silicone lubricant supplied or
petroleum jelly (Vaseline®). The o-rings must be intact and well
lubricated to make a watertight seal.
2. Remove the paddlewheel insert from the housing (see Figure 3).
3. Remove the snap ring from the valve assembly using a screw-
driver to pry the end of the ring free. Lift the ring out (see Figure 7).
4. Slide the valve assembly upward and out of the housing slowly.
NOTE: The flap valve retainer pin is a loose slip-fit and may
slide out when the assembly is removed.
5. Hold the cap nut on the blanking plug while sliding it into the
housing with the arrow on the top pointing forward toward the
bow. Seat the plug with a pushing twisting motion until the key fits
into the notch. Screw the cap nut in place and hand-tighten only.
Do not over tighten. Reattach the safety wire (see Figure 3).
6. Clean, repair, or replace the valve assembly so the flap valve
moves freely and seats against the valve housing.
7. To reinstall the valve assembly, first reassemble the flap valve
in the valve housing with the retainer pin and spring in place
(see Figure 7).
8. Remove the blanking plug. Slide the valve assembly into the
housing with the flap valve pointing downward. Insert the snap ring
being certain that it locks into the groove in the housing wall.
9. Hold the cap nut on the blanking plug while sliding it into the
housing. Be sure the arrow on the top is pointing forward
toward the bow. Seat it into place with a pushing twisting motion
until the key fits into the notch. Screw the cap nut in place.
Hand-tighten only. Do not over tighten.
10.Reattach the safety wire to prevent the insert from backing out
in the unlikely event that the cap nut fails or is screwed on
incorrectly (see Figure 3).
Winterizing
After the boat has been hauled for winter storage, remove the blanking
plug to let the water drain away before reinserting it. This will prevent any
water from freezing around the blanking plug and possibly cracking it.
Replacement Sensor & 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]
Blanking
Plug Kit
Cap Nut Hull Nut
Housing
& Hull Nut Kit
Pdlwhl &
Valve Kit
20-600
04-234-1 (plastic)
02-131-01 (bronze) 04-004 (plastic)
02-030 (bronze) 33-340-02 (plastic)
33-340-01 (bronze)
33-250
snap ring
valve assembly
flap valve
spring
retainer pin
housing
pull ring
Figure 6. Replacing the paddlewheel
top view
side view
arrow
small o-ring
shaft
flat side
of blade
notch
and o-rings
faces bow
Figure 7. Servicing the
valve assembly
Figure 5. Paddlewheel &
Valve Kit 33-250
large o-ring
medium o-ring
4
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Copyright © 2001 Airmar Technology Corp. Copyright © 2001 Airmar Technology Corp. Copyright © 2001 Airmar Technology Corp.
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