{"id":95,"date":"2026-07-15T16:51:21","date_gmt":"2026-07-15T16:51:21","guid":{"rendered":"https:\/\/oayachtservice.com\/knowledgebase\/?post_type=docs&#038;p=95"},"modified":"2026-07-15T16:51:22","modified_gmt":"2026-07-15T16:51:22","password":"","slug":"mach-5-headhunter-water-pressure-tune","status":"publish","type":"docs","link":"https:\/\/oayachtservice.com\/knowledgebase\/?docs=mach-5-headhunter-water-pressure-tune","title":{"rendered":"Mach 5 HeadHunter Water Pressure Tune"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">This procedure applies to Ocean Alexander yachts equipped with <strong>Headhunter Mach 5<\/strong> freshwater pressure pumps. Performing this preventive maintenance every <strong>6 months<\/strong>, or whenever a pump experiences nuisance alarms or excessive cycling, helps maintain consistent water pressure, improves pump performance, and extends system life.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Maintenance Interval<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Every <strong>6 months<\/strong><\/li>\n\n\n\n<li>After extended vessel lay-up<\/li>\n\n\n\n<li>Following freshwater system repairs<\/li>\n\n\n\n<li>Anytime the pump alarms, loses prime, or cycles excessively<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Required Tools<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tire pressure gauge<\/li>\n\n\n\n<li>Air compressor or hand pump<\/li>\n\n\n\n<li>Screwdrivers and basic hand tools<\/li>\n\n\n\n<li>Flashlight<\/li>\n\n\n\n<li>Replacement filter elements (if required)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Fill Fresh Water Tanks<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the vessel&#8217;s freshwater tanks contain sufficient water before beginning maintenance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Disconnect External Water Supply<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Disconnect any dockside water connection and ensure the vessel is operating solely from the onboard freshwater tanks.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Inspect the Accumulator Tank(s)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ocean Alexander yachts are typically equipped with one or more freshwater accumulator tanks.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove the cap from the Schrader valve.<\/li>\n\n\n\n<li>Briefly depress the valve stem.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Normal:<\/strong> Air is released.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fault:<\/strong> If water is discharged from the valve, the internal bladder has failed and the accumulator should be replaced.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Depressurize the System<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turn <strong>OFF<\/strong> all Mach 5 pumps.<\/li>\n\n\n\n<li>Open multiple faucets throughout the vessel (galley, heads, crew areas, flybridge, wet bar, etc.).<\/li>\n\n\n\n<li>Allow the system pressure to completely bleed off.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Check Accumulator Air Pressure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With the plumbing fully depressurized:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measure accumulator pre-charge pressure.<\/li>\n\n\n\n<li>Adjust to <strong>30\u201335 PSI<\/strong>.<\/li>\n\n\n\n<li>Replace any accumulator that will not maintain pressure.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6. Inspect the Pump Suction Side<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before restarting the pumps, inspect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suction strainers<\/li>\n\n\n\n<li>Filter housings<\/li>\n\n\n\n<li>O-rings<\/li>\n\n\n\n<li>Hose clamps<\/li>\n\n\n\n<li>Flexible hoses<\/li>\n\n\n\n<li>Isolation valves<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even a small air leak on the suction side can cause nuisance alarms, loss of prime, or dry-run faults. This is one of the most common causes of Mach 5 issues on larger yachts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">7. Purge Air from the Plumbing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the vessel has dual freshwater pumps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Start <strong>Pump #1<\/strong> only.<\/li>\n\n\n\n<li>Leave several faucets open until a steady stream of water is produced.<\/li>\n\n\n\n<li>Repeat with <strong>Pump #2<\/strong>.<\/li>\n\n\n\n<li>Continue until all air has been removed from the plumbing.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">8. Verify Pump Operation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Close all faucets and allow the pumps to build pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pump reaches shut-off pressure.<\/li>\n\n\n\n<li>No alarm indicators are present.<\/li>\n\n\n\n<li>Pumps stop normally.<\/li>\n\n\n\n<li>No rapid cycling occurs.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">9. Inspect the System<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Walk the vessel and inspect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Machinery space<\/li>\n\n\n\n<li>Utility room<\/li>\n\n\n\n<li>Crew areas<\/li>\n\n\n\n<li>Galley<\/li>\n\n\n\n<li>Heads<\/li>\n\n\n\n<li>Exterior wet bars<\/li>\n\n\n\n<li>Flybridge<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Check for leaks, drips, or unusual pump noise.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">10. Return the Vessel to Service<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reinstall any removed filter elements.<\/li>\n\n\n\n<li>Restore normal pump configuration.<\/li>\n\n\n\n<li>Reconnect dock water if required.<\/li>\n\n\n\n<li>Verify stable operation before departure.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Ocean Alexander Findings<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">During routine service, technicians frequently encounter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low accumulator air pressure<\/li>\n\n\n\n<li>Air leaks at suction strainers or filter housings<\/li>\n\n\n\n<li>Loose hose clamps<\/li>\n\n\n\n<li>Dirty inlet strainers<\/li>\n\n\n\n<li>Waterlogged accumulator tanks<\/li>\n\n\n\n<li>Pumps that have lost prime after freshwater tank service<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These conditions often cause intermittent alarms, excessive cycling, or reduced water pressure without indicating a failed pump.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Service Recommendation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ocean Alexander Service recommends incorporating this inspection into the vessel&#8217;s scheduled preventive maintenance program. Recording accumulator pressure, pump operating condition, and any corrective actions during each service visit provides a useful maintenance history and helps identify developing issues before they result in pump failures or loss of freshwater service.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This procedure applies to Ocean Alexander yachts equipped with Headhunter Mach 5 freshwater pressure pumps. Performing this preventive maintenance every 6 months, or whenever a pump experiences nuisance alarms or excessive cycling, helps maintain consistent water pressure, improves pump performance, and extends system life. Recommended Maintenance Interval Required Tools Procedure 1. Fill Fresh Water Tanks &#8230; <a title=\"Mach 5 HeadHunter Water Pressure Tune\" class=\"read-more\" href=\"https:\/\/oayachtservice.com\/knowledgebase\/?docs=mach-5-headhunter-water-pressure-tune\" aria-label=\"Read more about Mach 5 HeadHunter Water Pressure Tune\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[5],"doc_tag":[],"class_list":["post-95","docs","type-docs","status-publish","hentry","doc_category-plumbing"],"year_month":"2026-07","word_count":513,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"admin","author_nicename":"oaadmin","author_url":"https:\/\/oayachtservice.com\/knowledgebase\/?author=1"},"doc_category_info":[{"term_name":"Plumbing","term_url":"https:\/\/oayachtservice.com\/knowledgebase\/?doc_category=plumbing"}],"doc_tag_info":[],"_links":{"self":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/95","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=95"}],"version-history":[{"count":1,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/95\/revisions"}],"predecessor-version":[{"id":96,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=\/wp\/v2\/docs\/95\/revisions\/96"}],"wp:attachment":[{"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=95"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_category&post=95"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/oayachtservice.com\/knowledgebase\/index.php?rest_route=%2Fwp%2Fv2%2Fdoc_tag&post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}