SECTION 6
SERHT50NA A0808 6-3
Changing the Air Inlet and Proximal InlineFilters
WARNING Do not reverse the filters. Always replace them if dirty
or contaminated.
1.
Remove the Air Inlet Filter Cover (#8) by loosening the three (3)
thumbscrews.
2. Remove and discard the old filter. Install the new filter (p/n
HT460300), making certain that the filter media is laying flat
within the counterbore of the cover.
3. Reinstall the Air Inlet Filter Cover, making certain that the filter
media remains in place and the three thumbscrews are
tightened securely.
4. Remove and discard the old Proximal Inline Filter and tubing.
Replace with new filter/tubing assembly (p/n HT6004701).
ANNUAL MAINTENANCE PROCEDURE
NOTE: Perform all Routine Maintenance procedures with the addtion of
the following to replace the internal battery.
Discharge the HT50 Power Supply
1. Discharge the HT50 power supply per Discharge the HT50
Power Supply in Section 8.
Removal of Lower Case Assembly
1. Remove the lower case assembly per Disassembly (lower
case) in Section 8.
2. Remove the lower case cover, carefully avoiding tension on
the battery wire harness. Disconnect the 3 connectors at the
dual pack battery circuit board connecting the dual pack
battery circuit board to the main board. See figure 8-1.
3. To reinstall the lower case assembly reverse above steps.
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