Battery Replacement - mcmurdo 406 EPIRB User Manual

• Hold down the metal lever arm to take up the force of the spring.
• Push the HRU back then upwards out of the slot in the lever arm.
• When the rear clip disengages slowly release the lever arm.
• The HRU with its breakable rod can now be lifted free and replaced.
• Using pliers, remove the rear E-clip and slide off the old HRU.
• Fit he new HRU over the new rod, with its label facing outward.
• Refit the washer and the rear E-clip. ensure rod moves freely.
• Mark the HRU with an expiry date 2 years into the future.
• Slide the HRU into the slot in the lever arm and push lever arm down.
• Look under the spring and check that the washer is fully engaged.
• Slide EPIRB into D-shaped foot on lever arm, switches outermost.
• Refit cover by engaging hole over rod and then snapping into place.
• Refit R-clip through top of rod.
• On side of cover, remove old HRU expiry date and mark new date.

10.3. Battery replacement

The EPIRB uses a 9V Lithium battery pack, McMurdo type 82-140. Typically this will have
to be replaced every 5 years. The exact battery expiry date is marked on the rear of the EPIRB
lens dome and if you have a full enclosure it is also marked on the outside of the enclosure.
The battery expiry date should be checked regularly. You will need to replace the battery
when:
• The
expiry date has been reached or
• The EPIRB has been used in an emerg
ency situation or
• A false activation exceeds 2 hours of use.
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