{"id":3016,"date":"2026-09-12T00:24:02","date_gmt":"2026-09-12T00:24:02","guid":{"rendered":"https:\/\/sentrimax.com\/centrifuge-gearbox-repair\/"},"modified":"2026-09-12T00:24:02","modified_gmt":"2026-09-12T00:24:02","slug":"centrifuge-gearbox-repair","status":"publish","type":"page","link":"https:\/\/sentrimax.com\/fr\/centrifuge-gearbox-repair\/","title":{"rendered":"Centrifuge Gearbox Repair"},"content":{"rendered":"<p><!-- SX-AIU:START --><\/p>\n<div class=\"sx-content\">\n<nav class=\"sx-crumb\" aria-label=\"chapelure\"><a href=\"\/fr\/services\/\">Services<\/a> \u203a <span>Centrifuge Gearbox Repair<\/span><\/nav>\n<p class=\"sx-answer\">Sentrimax rebuilds decanter and tricanter centrifuge gearboxes at its Mansfield, TX, Edmonton, AB and Kitchener, ON facilities, covering planetary two- and three-stage designs, CYCLO cycloidal gearboxes, and hydraulic backdrives. Every gearbox repair includes full inspection, precision machining to OEM tolerances, dynamic balancing to ISO G 0.5, and a test run before it ships back.<\/p>\n<h2>Why the gearbox is the heart of a decanter centrifuge<\/h2>\n<p>A decanter centrifuge separates solids from liquid by spinning a bowl and an internal<br \/>\nscroll conveyor at high speed. The scroll has to rotate at a slightly different speed than<br \/>\nthe bowl, and that differential \u2014 not the absolute rotor speed \u2014 is what pushes settled<br \/>\nsolids along the bowl wall toward the discharge ports. The gearbox is the component that<br \/>\ncreates and holds that differential under continuous load. If it cannot maintain the<br \/>\ncorrect differential, the machine either stops conveying solids or conveys them too<br \/>\naggressively, overloading the scroll flights, the bowl bearings, and the seals on either<br \/>\nside of the gearbox itself.<\/p>\n<p>Because the differential sits between two fast-rotating shafts, the gearbox absorbs<br \/>\nconstant torque reversal, any contamination that gets past a failed seal, and heat<br \/>\ngenerated by its own internal friction. It is also one of the harder components to inspect<br \/>\nwithout pulling it off the machine, which is why gearbox wear is frequently diagnosed<br \/>\nlate \u2014 by the time noise or vibration reaches the operator&#8217;s ear, internal wear is often<br \/>\nalready advanced.<\/p>\n<h2>Gearbox types Sentrimax repairs<\/h2>\n<p>Not every decanter sets its differential speed the same way. Sentrimax repairs the<br \/>\nthree architectures most commonly found in the field, and the right rebuild approach<br \/>\ndepends on which one is installed.<\/p>\n<div class=\"sx-table-wrap\">\n<table class=\"sx-table\">\n<thead>\n<tr>\n<th>Gearbox type<\/th>\n<th>How it sets differential speed<\/th>\n<th>What matters most in a rebuild<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Planetary (2-stage)<\/td>\n<td>A single planetary gear set fixes the differential ratio mechanically<\/td>\n<td>Verifying the ratio is preserved exactly through re-machined or replaced gears<\/td>\n<\/tr>\n<tr>\n<td>Planetary (3-stage)<\/td>\n<td>A second planetary stage extends the reduction range beyond what one stage can carry<\/td>\n<td>Confirming both stages are matched after individual component repair<\/td>\n<\/tr>\n<tr>\n<td>CYCLO (cycloidal)<\/td>\n<td>An eccentric cycloidal disc drive replaces conventional involute gearing<\/td>\n<td>Inspecting the cycloidal discs and pins for wear patterns unique to this drive type<\/td>\n<\/tr>\n<tr>\n<td>Hydraulic backdrive<\/td>\n<td>A hydraulic motor applies and adjusts the differential torque<\/td>\n<td>Testing the hydraulic circuit alongside the mechanical components<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>What a gearbox rebuild involves<\/h2>\n<p>A gearbox that comes into a Sentrimax facility follows the same documented process as<br \/>\nthe rest of the centrifuge: full disassembly, an oil sample sent for third-party<br \/>\nanalysis, and a detailed inspection of every gear, bearing, seal and shaft inside the<br \/>\nhousing. Parts that are worn beyond a serviceable tolerance are replaced with components<br \/>\nbuilt to meet or exceed OEM specifications; parts that can be salvaged are machined back<br \/>\nto those tolerances rather than replaced outright. Once the gearbox is reassembled, it<br \/>\ndoes not go back on the shelf as a standalone unit \u2014 it is balanced with the rotating<br \/>\nassembly to ISO G 0.5 and put through a test run as part of the centrifuge&#8217;s overall<br \/>\ncommissioning, not tested in isolation.<\/p>\n<p>This is one part of Sentrimax&#8217;s broader <a href=\"\/fr\/services\/\">centrifuge repair<br \/>\nservices<\/a>, which also cover the bowl, scroll, bearings, seals and controls that the<br \/>\ngearbox works alongside.<\/p>\n<h2>Reading the warning signs before the gearbox fails<\/h2>\n<p>Gearbox failure is rarely sudden. It usually announces itself first through a change in<br \/>\nnoise or case temperature, then through backlash you can feel at the input shaft, and<br \/>\nfinally through metal in the oil. Waiting past that point risks damage spreading from the<br \/>\ngearbox into the bowl and scroll assembly it drives. Our page on<br \/>\n<a href=\"\/fr\/centrifuge-gearbox-failure-signs\/\">centrifuge gearbox failure warning signs<\/a><br \/>\nwalks through what to check and when continued operation stops being a reasonable<br \/>\nrisk.<\/p>\n<h2>Choosing the right rebuild path<\/h2>\n<p>The rebuild scope differs meaningfully by gearbox type. If your unit is a two- or<br \/>\nthree-stage planetary design, our <a href=\"\/fr\/planetary-gearbox-rebuild\/\">planetary gearbox<br \/>\nrebuild page<\/a> covers what gets replaced versus re-machined and how the ratio is<br \/>\nverified before reassembly. If it is a cycloidal drive, see the<br \/>\n<a href=\"\/fr\/cyclo-gearbox-service\/\">CYCLO gearbox service page<\/a> for how that mechanism<br \/>\ndiffers from conventional gearing. If your decanter uses a hydraulic backdrive rather than<br \/>\na fixed-ratio gearbox, the <a href=\"\/fr\/hydraulic-backdrive-service\/\">hydraulic backdrive<br \/>\nservice page<\/a> explains when that design is preferable and what its own failure symptoms<br \/>\nlook like.<\/p>\n<p>Some gearbox problems can be assessed and corrected with the centrifuge still on site;<br \/>\nothers require the unit to come into one of Sentrimax&#8217;s three facilities for full<br \/>\ndisassembly, precision measurement and machine-shop work that a field crew cannot<br \/>\nperform. Which path applies depends on what the inspection finds, not on which is more<br \/>\nconvenient to schedule.<\/p>\n<h2>What&#8217;s included on every gearbox job<\/h2>\n<p>Regardless of gearbox type, every job Sentrimax performs \u2014 gearbox repair included \u2014<br \/>\ncarries the same baseline: a fit evaluation confirming how the repaired or replaced<br \/>\ncomponents actually sit against the mating parts, a detailed inspection report<br \/>\ndocumenting what was found and what was done about it, dynamic balancing of the<br \/>\nreassembled rotating assembly, and a test run before the unit ships. None of these are<br \/>\npriced as optional extras layered onto a base repair; they are how a gearbox repair is<br \/>\nverified before it goes back into service.<\/p>\n<h2>The three-stage process applied to a gearbox<\/h2>\n<p>A gearbox follows the same documented, ISO 9001:2015 process as the rest of the<br \/>\ncentrifuge, adapted to its own components:<\/p>\n<ol class=\"sx-steps\">\n<li><strong>Inspection et devis.<\/strong> The gearbox is tagged for triage, an oil<br \/>\nsample is pulled and sent for third-party analysis, and it is disassembled for a<br \/>\nlicensed technician&#8217;s inspection. Critical precision fits \u2014 shaft-to-bearing bore, gear<br \/>\nmesh clearance, and similar dimensions specific to the gearbox type \u2014 are measured and<br \/>\ndocumented with annotated photos, feeding into a quotation package covering the full<br \/>\nscope, required parts, pricing and estimated delivery time.<\/li>\n<li><strong>R\u00e9paration.<\/strong> Once approved, parts are assembled to a package meeting or<br \/>\nexceeding OEM specifications, any needed welding is completed, and machining brings<br \/>\nsalvageable components back to OEM tolerances. The gearbox is reassembled with the<br \/>\nrotating assembly it drives, the full assembly is balanced up to ISO G 0.5, and a<br \/>\ntechnician completes a post-repair quality control inspection before a full test run<br \/>\navec un rapport de performance.<\/li>\n<li><strong>Livraison.<\/strong> The repaired unit ships through a dedicated broker<br \/>\nnetwork, with an invoice detailing all parts, labor and completed analyses, plus<br \/>\nshipping confirmation and tracking.<\/li>\n<\/ol>\n<h2>Field visit or shop rebuild: how that decision gets made<\/h2>\n<p>Sentrimax has field service technicians and remote services available for<br \/>\ndiagnostics, minor corrective work, and confirming whether a gearbox issue is something<br \/>\nthat can be addressed without pulling the unit off the machine. But the measurements<br \/>\nand machine-shop capability that a genuine rebuild depends on \u2014 precision-grinding,<br \/>\nmilling, lathe-turning, and dynamic balancing to ISO G 0.5 \u2014 exist at Sentrimax&#8217;s<br \/>\nfacilities, not in a field toolbox. A field visit typically answers the question of<br \/>\nwhether a shop rebuild is warranted; it is not usually a substitute for one once a<br \/>\ngearbox has reached the point of measurable wear.<\/p>\n<h2>Why brand doesn&#8217;t determine repairability<\/h2>\n<p>Sentrimax services centrifuges from all major manufacturers \u2014 Sharples, Flottweg,<br \/>\nCentrisys, Derrick, GEA, Alfa Laval, Tomoe, Andritz, Bird, Pieralisi and others \u2014 and<br \/>\ngearbox repair follows the same inspection-first approach regardless of which brand&#8217;s<br \/>\ncentrifuge the gearbox came out of. Sentrimax is an independent MRO provider, not<br \/>\naffiliated with, authorized by, or endorsed by any of these manufacturers; brand names<br \/>\ndescribe the equipment we service, not a partnership.<\/p>\n<h2>What determines how extensive a gearbox rebuild is<\/h2>\n<p>Two gearboxes with the same symptom on receipt can leave with very different repair<br \/>\nscopes. What determines the difference is what the inspection actually finds: whether<br \/>\nwear is limited to one or two components or has spread through the gear train and<br \/>\nbearings, whether the required parts are readily available or need to be machined from<br \/>\nscratch, and whether housing or shaft damage requires welding and re-machining rather<br \/>\nthan straight component replacement. Sentrimax documents that scope in the quotation<br \/>\npackage prepared after inspection, so the extent of the work is based on measured<br \/>\ncondition rather than assumed from the symptom alone.<\/p>\n<h2>What to include when you contact us about a gearbox<\/h2>\n<p>A useful first inquiry does not need to be a formal quote request. The details that<br \/>\nspeed up an accurate assessment are the gearbox type if you know it, the centrifuge make<br \/>\nand model it is installed on, and a plain description of what you are observing:<\/p>\n<ul class=\"sx-check\">\n<li>Gearbox type \u2014 planetary, CYCLO, or hydraulic backdrive \u2014 if it is known or visible<br \/>\non a nameplate<\/li>\n<li>Centrifuge brand and model the gearbox is installed on<\/li>\n<li>What changed and when \u2014 noise, heat, backlash, oil condition, or conveyance<br \/>\nbehavior<\/li>\n<li>Whether the centrifuge is still running or has already been shut down<\/li>\n<li>Any prior repair history on the gearbox, if available<\/li>\n<\/ul>\n<p>None of this commits you to anything. It lets Sentrimax tell you, before the unit ever<br \/>\nships, whether you are likely looking at a contained gearbox repair or something that has<br \/>\nalready reached other components \u2014 and whether a field visit or a full shop inspection is<br \/>\nthe right next step.<\/p>\n<h2>Get your gearbox assessed<\/h2>\n<p>If you are seeing any of the early warning signs, or simply want a documented condition<br \/>\nreport before deciding whether to rebuild, send us the details of your centrifuge and<br \/>\ngearbox type.<\/p>\n<section class=\"sx-faq\">\n<h2>Foire aux questions<\/h2>\n<details>\n<summary>Can a centrifuge gearbox be repaired in the field, or does it need to come into a shop?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Some inspection and minor corrective work can happen on site, but a full gearbox rebuild \u2014 disassembly, precision measurement, machining and re-balancing with the rotating assembly \u2014 requires the unit to come into one of Sentrimax&#039;s three facilities. Whether a field visit is enough depends on what the initial inspection finds.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do I know which type of gearbox is on my centrifuge?<\/summary>\n<div class=\"sx-faq-a\">\n<p>The gearbox nameplate or the original equipment documentation will identify it as planetary, CYCLO, or hydraulic backdrive. If that information is missing, our technicians can identify the type during the initial inspection stage before any repair work begins.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Does a gearbox rebuild include re-balancing the rotating assembly?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Yes. Gearbox repair at Sentrimax is not treated as a standalone job \u2014 the gearbox is reassembled with the bowl and scroll it drives, the full rotating assembly is dynamically balanced to ISO G 0.5, and the unit is put through a test run before it ships.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What if the gearbox housing itself is cracked or damaged, not just the internal gears?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Housing damage is assessed during the inspection stage along with the internal components. Depending on the extent of the damage, repair may involve welding and machining the housing back to tolerance, or sourcing a replacement housing if the original cannot be restored to a serviceable condition.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What information do you need before quoting a gearbox rebuild?<\/summary>\n<div class=\"sx-faq-a\">\n<p>The gearbox type (planetary, CYCLO or hydraulic backdrive), the centrifuge make and model it is installed on, and a description of the symptoms you are seeing \u2014 noise, heat, backlash, oil condition or conveyance problems. A physical inspection at receipt confirms the full scope.<\/p>\n<\/div>\n<\/details>\n<\/section>\n<section class=\"sx-cta\">\n<h2>Parlez \u00e0 un sp\u00e9cialiste des centrifugeuses<\/h2>\n<p>Envoyez-nous les d\u00e9tails de la machine et nous vous ferons parvenir un devis et une description du p\u00e9rim\u00e8tre d&#039;inspection.<\/p>\n<p><a class=\"sx-btn\" href=\"\/fr\/contact\/\">Demander un devis<\/a><\/section>\n<\/div>\n<p><!-- SX-AIU:END --><\/p>","protected":false},"excerpt":{"rendered":"<p>Sentrimax rebuilds decanter and tricanter centrifuge gearboxes at its Mansfield, TX, Edmonton, AB and Kitchener, ON facilities, covering planetary two- and three-stage designs, CYCLO cycloidal gearboxes, and hydraulic backdrives. Every gearbox repair includes full inspection, precision machining to OEM tolerances, dynamic balancing to ISO G 0.5, and a test run before it ships back.<\/p>","protected":false},"author":10,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-3016","page","type-page","status-publish","hentry"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Sentrimax rebuilds planetary, CYCLO and hydraulic backdrive centrifuge gearboxes, with full inspection, precision machining, and dynamic balancing to ISO G 0.5.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/sentrimax.com\/fr\/centrifuge-gearbox-repair\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta 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