Airmar B744V - Manual (Page 4)

1. On the blanking plug, inspect the O-rings (replace if necessary)
and lubricate them with silicone lubricant or petroleum jelly
(Vaseline®) (see Figure 3). The O-rings must be intact and well
lubricated to make a watertight seal.
2. Remove the paddlewheel insert from the housing by removing
the safety wire from the pull ring and the INSERT nut (see
Figure 2). Unscrew the INSERT nut. Do not remove the CAP
nut, as the valve assembly will come out.
3. Grasp the pull ring and remove the paddlewheel insert with a
slow pulling motion.
NOTE: In the unlikely event that the paddlewheel insert cannot
be removed, see “Servicing the Valve Assembly” below.
4. Slide the blanking plug into the housing. Seat it into place with a
pushing twisting motion until the keys fit into the notches (see
Figure 3). Screw the INSERT nut in place and hand-tighten
only. Do not over tighten.
5. Reattach the safety wire (see Figure 2).
Servicing the Valve Assembly: B744V/VL
WARNING: The insert/blanking plug cannot be secured without
the valve sleeve. When the valve assembly is removed, always
re-insert the valve sleeve secured with the CAP nut and the
insert/blanking plug secured with the INSERT nut and safety wire
for a watertight seal.
CAUTION: Be careful to avoid cross threading the CAP nut.
Should the valve fail, it will need to be removed for servicing.
Follow the steps below. If a new valve assembly is required and
not immediately available, the valve sleeve must be reinstalled in
the multisensor housing for a watertight seal. Remove the flap
valve, spring pin, and spring from the sleeve (see Figure 5). Then
reinstall the sleeve in the housing.
1. On the blanking plug, inspect the O-rings (replace if necessary)
and lubricate them with silicone lubricant or petroleum jelly
(Vaseline®) (see Figure 3). The O-rings must be intact and well
lubricated to make a watertight seal.
2. Remove the safety wire and unscrew the CAP nut (see
Figure 2). With the blanking plug ready in one hand, remove the
paddlewheel insert and valve assembly as one unit by grasping
the pull ring and pulling upward. Rapidly replace the valve
assembly with the blanking plug to minimize the flow of water
into the boat. Temporarily secure it with the safety wire. Do not
leave the boat in the water unattended. This is not a watertight
or secure seal!
3. Separate the paddlewheel insert from the valve assembly by
unscrewing the INSERT nut (see Figure 3). Grasp the pull ring
and pull slowly upward.
4. Clean, repair, or replace the valve
assembly so the flap valve moves
freely and seats against the sleeve
(see Figure 5).
5. To reinstall the valve assembly,
inspect the O-rings on the paddle-
wheel insert (replace if necessary)
and lubricate them with silicone
lubricant or petroleum jelly
(Vaseline®) (see Figure 3). The
O-rings must be intact and well
lubricated to make a watertight
seal.
6. Slide the paddlewheel insert into
the valve assembly. Seat it in
place with a twisting motion until
the keys fit into the notches. Secure the paddlewheel insert with
the INSERT nut. Hand-tighten only. Do not over tighten.
7. Remove the safety wire from the multisensor. With the
combined valve assembly and paddlewheel insert ready in one
hand, remove the blanking plug. Slide the assembly into the
multisensor housing with the arrow on the top pointing forward
toward the bow. Be sure the cable fits into the cable channel
and the notch in the sleeve fits into the key in the housing (see
Figure 5). (A pushing twisting motion will locate the key.) Screw
the CAP nut in place, being careful to avoid cross-threading.
Hand-tighten only. Do not over tighten.
8. Reattach the safety wire (see Figure 2).
Servicing the Paddlewheel Insert: B744V/VL
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. Order a replacement Paddlewheel Kit No. 33-113.
1. Using the new paddlewheel shaft, push out the old shaft about
6mm (1/4"). With pliers, remove the old shaft (see Figure 3).
2. Place the new paddlewheel in the cavity with the flat side of the
blade facing the same direction as the arrow on the top of the insert.
3. Tap in the new shaft into place until the ends are flush with the
sides of the insert.
4. Install two O-rings in the lower groves near the paddlewheel.
Do not place them near the pull ring.
5. The remaining two O-rings are placed in a similar position on
the blanking plug.
6. To reinstall the paddlewheel insert, see “Installing the
Paddlewheel Insert” on page 2.
Winterizing: B744V/VL
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 sensor is
printed on the cable tag. Do not remove this tag. When ordering,
specify the part number, date, and frequency in kHz. For convenient
reference, record this information at the bottom of page one.
Lost, broken, and worn parts should be replaced immediately.
Paddlewheel Kit 33-113
Paddlewheel & Valve Kit 33-535-01
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]
Model
High-Performance
Fairing
Hull Nut Cap Nut
Blanking
Plug
Insert
B744V 33-476-01 02-030 04-234-1 33-551-01 33-590-01
B744VL 33-476-01 02-030 04-234-1 33-551-03 33-590-02
B765LH
B765LM
33-476-01 02-030 NA NA NA
4
Figure 5. Valve assembly
sleeve
flap
spring
spring
cable
notch
channel
valve
pin
Copyright © 2005 Airmar Technology Corp.
Copyright © 2004 ­ 2013 Airmar Technology Corp. All rights reserved.
AIRMAR
®
TECHNOLOGY CORPORATION
35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA
www.airmar.com