GME MT401FFSVC User manual

MT401FFSVC
Applicable EPIRB Models
• MT403FG water activated GPS equipped beacon provided
with an automatic (hydrostatic) release bracket.
• MT603FG water activated GPS equipped beacon provided
with an automatic (hydrostatic) release bracket.
EPIRB FLOAT FREE
HOUSING ROUTINE
SERVICE
INSTRUCTION MANUAL

2INSTRUCTION MANUAL MT401FFSVC
INTRODUCTION
The MT403FF/403FG/603FG comprises of an EPIRB housed within a
protective enclosure. This enclosure is designed to automatically open
and release the EPIRB once a dened depth of submersion is reached.
It is the Hydrostatic Release Unit (HRU) which senses the pressure and
causes the release. The HRU is a replaceable item and has a limited
rated service life of no greater than 2 years, commencing from date of
shipboard installation.
REQUIREMENTS
• To carry out this service you must have a Float Free Housing
Refurbishment Kit ‘MT401FFSVC’ (Product No. 015773)
• Small Philips or at bladed screwdriver
• 13mm open ended spanner
• 13mm socket and ratchet
OPERATIONS
Please remove the housing cover (see Figure 1).
Figure 1 – Latch Type II

MT401FFSVC INSTRUCTION MANUAL 3
SERVICING LATCH TYPE II HOUSING
The instructions immediately below are applicable to housings equipped
with the Latch Type II mechanism.
Step Action – Type II Latch
1. Unpack the service kit and inspect the contents to verify that
no damage has been incurred in transit.
1. Hold the FRONT COVER of the housing and with your free
hand rotate the yellow release lever anticlockwise
2. Without releasing the lever, remove the FRONT COVER
completely away from the HOUSING BASE retaining the EPIRB.
3. Now rmly grasp the EPIRB and withdraw it from the
HOUSING BASE.
WARNING: DO NOT remove the EPIRB from its mounting bracket if it is
wet. To do so may allow the beacon to automatically activate. Ensure
the EPIRB is thoroughly dry before removal.
4. Press rmly on the spring plate (Figure 2) and undo the
stainless steel hex nut by turning it counter-clockwise.
5. Remove the yellow latching plate from the HRU bolt and
retain for re-use when re-assembling (Figure 9), then gradually
remove the applied pressure on the spring plate, allowing it to
curl forward and away from the HOUSING BASE.
6. Remove the yellow spacer plate from the HRU spigot and
retain for re-use when re-assembling.
7. Withdraw the HRU by sliding it forward o the bolt.
8. Loosen the stainless steel hex nut on the bolt (Figure 4)
suciently to allow the bolt’s head to slide sideways and
thereby disengage from the key slot in the HOUSING BASE
(Figure 4).
9. Replace the bolt and nut just removed with the replacement
parts provided. Note the head of the bolt must be rotated in
a specic orientation to allow it to fully engage sideways into
the slot, using a spanner to nip up the nut.
10. Place the new HRU over the bolt (Figure 5) and seat it within
the corresponding circular recess provided in the HOUSING
BASE (Figure 6).
11. Ret the yellow spacer plate which was previously removed
and retained onto the HRU spigot (Figure 7).
12. Press the spring plate fully back into HOUSING BASE and then
ret the yellow latching plate over the HRU bolt ensuring that
the key on the latching plate is located properly in the slotted
hole on the spring plate.

4INSTRUCTION MANUAL MT401FFSVC
Step Action – Type II Latch
13. Secure the latching plate and spring plate into position by
tting the second stainless steel hex nut provided onto the
HRU bolt (Figure 8). The nal position of the spring plate is
controlled by adjusting the position of this second hex nut on
the HRU bolt. Tighten the nut in a clockwise direction so that
a gap of between 2mm to 4mm is present the top edge of the
spring plate and the rib on the HOUSING BASE (Figure 9).
14. Return the EPIRB into the HOUSING BASE.
15. Before re-tting the FRONT COVER it is necessary to replace
the HRU expiry plate xed to it. Firstly remove the two
retention screws located at each end of the metal label plate.
16. Gently prise the metal label plate o the HOUSING COVER (as
it is also retained used double sided adhesive). By rubbing
your nger over the surface any remnants of adhesive should
be rolled o.
17. Remove the backing from the new metal label and place it so
that the two screw holes align with the corresponding ones
provided on the HOUSING COVER.
18. Fit and rmly tighten the two label retention screws.
19. Using a sharp implement mark (x) the Hydrostatic Release
Replacement Date label just tted with month and year of
next replacement. This is to be the later of two years from
the current date, or from when the unit will be returned into
service.
20. Re-t the HOUSING COVER to complete the service operation.

MT401FFSVC INSTRUCTION MANUAL 5
Part Number: 310345 Drawing Number: 42773-3
17 Gibbon Road, Winston Hills NSW 2153, Australia
gme.net.au
GME Pty Ltd
Figure 2 (Type II)
Figure 4 (Type II)
Figure 6 (Type II)
Figure 8 (Type II)
Figure 3 (Type II)
Figure 5 (Type II)
Figure 7 (Type II)
Figure 9 (Type II)