{"id":3045,"date":"2026-09-12T00:24:02","date_gmt":"2026-09-12T00:24:02","guid":{"rendered":"https:\/\/sentrimax.com\/cyclo-gearbox-service\/"},"modified":"2026-09-12T00:24:02","modified_gmt":"2026-09-12T00:24:02","slug":"cyclo-gearbox-service","status":"publish","type":"page","link":"https:\/\/sentrimax.com\/fr\/cyclo-gearbox-service\/","title":{"rendered":"What Is a CYCLO Gearbox and How Is It Serviced?"},"content":{"rendered":"<p><!-- SX-AIU:START --><\/p>\n<div class=\"sx-content\">\n<nav class=\"sx-crumb\" aria-label=\"chapelure\"><a href=\"\/fr\/centrifuge-gearbox-repair\/\">Centrifuge Gearbox Repair<\/a> \u203a <span>What Is a CYCLO Gearbox and How Is It Serviced?<\/span><\/nav>\n<p class=\"sx-answer\">A CYCLO gearbox uses an eccentric cycloidal disc drive instead of conventional gear teeth to set the bowl-to-scroll differential speed on a decanter centrifuge. Sentrimax services CYCLO-brand gearboxes, including Sumitomo units, by inspecting the cycloidal discs and pins for wear, machining or replacing worn components, and re-balancing the rebuilt assembly to ISO G 0.5.<\/p>\n<h2>What makes a CYCLO gearbox different<\/h2>\n<p>Most reduction gearboxes use involute gear teeth meshing directly against each other.<br \/>\nA CYCLO gearbox instead uses a cycloidal disc \u2014 a specially profiled rotating disc driven<br \/>\nby an eccentric input shaft \u2014 that engages a ring of pins around the housing. As the<br \/>\neccentric drives the disc, the disc&#8217;s profile causes it to roll against the pins rather<br \/>\nthan mesh tooth-to-tooth, producing the output rotation and, on a decanter, the<br \/>\ndifferential speed between bowl and scroll. This is a fundamentally different load path<br \/>\nthan a planetary gear set, and it wears differently as a result.<\/p>\n<h2>Why cycloidal drives show up on decanters<\/h2>\n<p>Cycloidal gearboxes are used where a high reduction ratio is needed in a compact<br \/>\nhousing, and where tolerance for shock loading matters. Because the load in a cycloidal<br \/>\ndrive is distributed across multiple pins engaging the disc profile simultaneously,<br \/>\nrather than concentrated at a single pair of meshing teeth, this design handles the<br \/>\ntorque reversals and momentary overloads that occur during centrifuge start-up, upset<br \/>\nconditions, and process disturbances differently than conventional gearing does.<\/p>\n<h2>What a CYCLO gearbox service involves<\/h2>\n<p>Servicing a cycloidal drive follows the same disciplined process as any other gearbox<br \/>\nat Sentrimax, but the inspection points are specific to this mechanism:<\/p>\n<div class=\"sx-spec\">\n<dl>\n<dt>Cycloidal disc inspection<\/dt>\n<dd>Checked for wear on the profile surface that engages the ring pins, and for any<br \/>\nscoring or pitting from contamination or lubrication breakdown.<\/dd>\n<dt>Ring pin and pin housing inspection<\/dt>\n<dd>Each pin and its bore is checked for wear, since uneven pin wear changes how load is<br \/>\ndistributed around the disc.<\/dd>\n<dt>Eccentric shaft and bearing inspection<\/dt>\n<dd>The input eccentric and its bearings carry the drive load and are inspected alongside<br \/>\nthe output bearings supporting the disc assembly.<\/dd>\n<dt>Reassembly and balance<\/dt>\n<dd>Once repaired, the gearbox is reassembled with the rotating assembly, dynamically<br \/>\nbalanced to ISO G 0.5, and put through a test run as part of the overall centrifuge<br \/>\ncommissioning.<\/dd>\n<\/dl>\n<\/div>\n<h2>Rolling contact vs sliding contact: why it matters<\/h2>\n<p>Conventional involute gear teeth transmit load through a combination of rolling and<br \/>\nsliding contact at the point where two teeth meet, which is part of why lubrication<br \/>\nfilm condition matters so much to gear tooth life. A cycloidal drive&#8217;s disc-and-pin<br \/>\nengagement is predominantly a rolling contact rather than a sliding one across most of<br \/>\nits load path. That changes both the wear pattern an inspection looks for and the<br \/>\nlubrication demands of the unit \u2014 a CYCLO gearbox does not necessarily fail the same way<br \/>\na worn planetary gear set does, even though the symptoms an operator notices (noise,<br \/>\nheat, backlash) can look similar from the outside.<\/p>\n<h2>Lubrication and oil sampling on CYCLO units<\/h2>\n<p>Because much of the internal wear on a cycloidal drive shows up first as changes in<br \/>\nlubricant condition rather than obvious visual damage, an oil sample sent for<br \/>\nthird-party analysis at the inspection stage is a meaningful early indicator on these<br \/>\nunits. Particle content and type can point toward disc or pin wear before it has<br \/>\nprogressed far enough to be visible without disassembly.<\/p>\n<h2>Precision machining for cycloidal components<\/h2>\n<p>Where a cycloidal disc or eccentric shaft is salvageable rather than requiring<br \/>\nreplacement, Sentrimax&#8217;s machine shop capability \u2014 milling, lathe-turning and<br \/>\nprecision-grinding \u2014 is used to bring the component&#8217;s critical surfaces back to<br \/>\ntolerance. Where an exact replacement part is not available, the same engineering<br \/>\nservices capability can design and manufacture a reverse-engineered replacement rather<br \/>\nthan leaving the gearbox without a repair path.<\/p>\n<h2>Sumitomo and other CYCLO-brand units<\/h2>\n<p>Sentrimax stocks and services CYCLO-brand gearboxes, including Sumitomo CYCLO units, as<br \/>\npart of its centrifuge gearbox repair capability. Sentrimax is an independent MRO<br \/>\nprovider, not affiliated with, authorized by, or endorsed by Sumitomo or any other<br \/>\ngearbox manufacturer \u2014 brand names here describe the equipment we service, nothing more.<\/p>\n<h2>Documentation delivered with a CYCLO gearbox service<\/h2>\n<p>As with any other gearbox type, a CYCLO service comes with the same documentation<br \/>\ntrail as the rest of a Sentrimax repair: an inspection report identifying which<br \/>\ncomponents \u2014 disc, pins, eccentric shaft, bearings or seals \u2014 were found worn and to<br \/>\nwhat extent, a quotation package covering the approved scope, a post-repair quality<br \/>\ncontrol inspection, and a test run performance report confirming the reassembled unit<br \/>\nruns correctly. That documentation is what lets a maintenance manager verify what was<br \/>\nactually done to a mechanism that is otherwise difficult to inspect visually once it is<br \/>\nback in the housing.<\/p>\n<h2>What determines whether a CYCLO unit is rebuilt or replaced<\/h2>\n<p>As with planetary gearboxes, the rebuild-or-replace decision on a cycloidal drive is<br \/>\nmade component by component: the disc, the pins, the eccentric shaft, the bearings and<br \/>\nthe housing are each assessed individually during inspection. A housing in sound<br \/>\ncondition paired with a worn disc and pin set is a very different scope of work than<br \/>\nhousing damage that cannot be corrected by machining, and the two are not treated the<br \/>\nsame simply because both are labeled a &#8220;CYCLO gearbox problem.&#8221;<\/p>\n<h2>Why identifying the drive type early avoids wasted diagnostic time<\/h2>\n<p>Because a cycloidal drive&#8217;s internal wear pattern differs from a planetary gear set&#8217;s,<br \/>\ndiagnosing a CYCLO gearbox as if it were conventional gearing can lead to the wrong<br \/>\ncomponents being checked first. Confirming the gearbox type \u2014 from a nameplate, original<br \/>\ndocumentation, or a quick inspection \u2014 before pursuing an in-depth diagnosis saves time<br \/>\nthat would otherwise go toward ruling out the wrong failure mode.<\/p>\n<h2>Common CYCLO failure modes<\/h2>\n<ul class=\"sx-check\">\n<li><strong>Disc profile wear.<\/strong> The cycloidal disc&#8217;s engagement surface wears<br \/>\ngradually with normal operation and more quickly if lubrication has degraded or<br \/>\ncontamination has entered the housing.<\/li>\n<li><strong>Ring pin and roller wear.<\/strong> Individual pins or their rollers can wear<br \/>\nunevenly, changing how load is shared around the disc and accelerating wear at the<br \/>\npins carrying more than their share.<\/li>\n<li><strong>Eccentric bearing wear.<\/strong> The bearings supporting the eccentric input<br \/>\nshaft carry the full drive load and are a common source of the backlash and noise<br \/>\nsymptoms covered on our gearbox failure signs page.<\/li>\n<li><strong>Seal failure.<\/strong> As with any gearbox, a failed input or output seal<br \/>\nallows contamination in and lubricant out, and is often what turns a slow wear process<br \/>\ninto a faster one.<\/li>\n<\/ul>\n<h2>How a CYCLO gearbox compares to conventional gearing in service<\/h2>\n<p>A conventional helical or worm gear reducer concentrates load at the meshing tooth<br \/>\nsurfaces, which is where wear and eventual failure typically originate. A cycloidal<br \/>\ndrive distributes load across the disc profile and multiple ring pins simultaneously,<br \/>\nwhich tends to give it a different service life profile under shock loading \u2014 the kind<br \/>\nof momentary overload a decanter can see during start-up or an upset in feed<br \/>\nconditions \u2014 compared to conventional gearing carrying the same average torque. This is<br \/>\na design trade-off, not a guarantee that a CYCLO unit will outlast or underperform a<br \/>\nplanetary gearbox in a given application; the right comparison depends on the specific<br \/>\nduty the centrifuge sees.<\/p>\n<h2>If your gearbox isn&#8217;t a CYCLO design<\/h2>\n<p>Not every decanter uses a cycloidal drive. If your centrifuge is showing the symptoms<br \/>\ncovered on our <a href=\"\/fr\/centrifuge-gearbox-failure-signs\/\">gearbox failure warning<br \/>\nsigns<\/a> page but turns out to use a conventional gear train, see our<br \/>\n<a href=\"\/fr\/planetary-gearbox-rebuild\/\">planetary gearbox rebuild page<\/a> instead. If it<br \/>\nuses a hydraulic motor rather than any mechanical gear set to set differential speed, see<br \/>\nour <a href=\"\/fr\/hydraulic-backdrive-service\/\">hydraulic backdrive service page<\/a>. For the<br \/>\nfull range of gearbox repair options, see the<br \/>\n<a href=\"\/fr\/centrifuge-gearbox-repair\/\">centrifuge gearbox repair<\/a> overview.<\/p>\n<h2>What to expect if the disc or pins need replacement rather than machining<\/h2>\n<p>When wear on the cycloidal disc or ring pins has progressed beyond what<br \/>\nLe meulage de pr\u00e9cision permet de corriger les d\u00e9fauts, les composants de remplacement sont approvisionn\u00e9s ou, lorsqu&#039;une pr\u00e9cision exacte est requise, les pi\u00e8ces sont fournies.<br \/>\nmatch n&#039;est pas disponible, fabriqu\u00e9 par les services d&#039;ing\u00e9nierie de Sentrimax et<br \/>\natelier d&#039;usinage. Les deux chemins m\u00e8nent \u00e0 la m\u00eame s\u00e9quence de r\u00e9assemblage, d&#039;\u00e9quilibrage et d&#039;essai.<br \/>\ncomme une r\u00e9paration qui ne n\u00e9cessitait qu&#039;un usinage \u2014 la documentation ne fait que mentionner les pi\u00e8ces<br \/>\nDes pi\u00e8ces remplac\u00e9es plut\u00f4t que restaur\u00e9es.<\/p>\n<h2>Voici \u00e0 quoi ressemble le service CYCLO lorsqu&#039;il est combin\u00e9 \u00e0 d&#039;autres r\u00e9parations<\/h2>\n<p>Il est rare qu&#039;une bo\u00eete de vitesses CYCLO soit le seul \u00e9l\u00e9ment n\u00e9cessitant une intervention. Il est fr\u00e9quent qu&#039;une<br \/>\nl&#039;entretien de la bo\u00eete de vitesses doit \u00eatre combin\u00e9 avec la r\u00e9paration du bol ou de la spirale, le remplacement des roulements, ou<br \/>\nLes travaux d&#039;\u00e9tanch\u00e9it\u00e9 peuvent \u00eatre effectu\u00e9s lors de la m\u00eame visite, car tous ces composants partagent le m\u00eame axe de rotation.<br \/>\nDans ce cas, les travaux sur la bo\u00eete de vitesses sont effectu\u00e9s en m\u00eame temps que le reste de l&#039;assemblage.<br \/>\nr\u00e9parer de sorte que l&#039;\u00e9quilibrage final et l&#039;essai refl\u00e8tent l&#039;ensemble complet et r\u00e9assembl\u00e9<br \/>\nla machine plut\u00f4t que la bo\u00eete de vitesses prise isol\u00e9ment.<\/p>\n<h2>Que faut-il avoir sous la main avant de nous contacter ?<\/h2>\n<p>Une photo de la plaque signal\u00e9tique de la bo\u00eete de vitesses, la marque et le mod\u00e8le de la centrifugeuse, et une description de ce qui<br \/>\nvous avez observ\u00e9 \u2014 bruit, chaleur, jeu, \u00e9tat de l&#039;huile ou comportement du syst\u00e8me de transport \u2014 sont<br \/>\nsuffisamment pour entamer une conversation constructive sur la port\u00e9e. Si la plaque signal\u00e9tique est manquante ou<br \/>\nL&#039;illisibilit\u00e9 ne constitue pas un obstacle ; il s&#039;agit simplement d&#039;une v\u00e9rification effectu\u00e9e par nos techniciens lors de l&#039;intervention.<br \/>\nl&#039;inspection initiale, parmi tout le reste.<\/p>\n<h2>Renseignez-vous sur l&#039;entretien des bo\u00eetes de vitesses CYCLO<\/h2>\n<p>Si vous poss\u00e9dez une carafe ou un tricanter \u00e9quip\u00e9 d&#039;un syst\u00e8me CYCLO pr\u00e9sentant des signes d&#039;usure, un<br \/>\nL&#039;inspection \u00e0 r\u00e9ception confirme l&#039;\u00e9tat du disque et des broches avant toute intervention.<br \/>\ncit\u00e9.<\/p>\n<section class=\"sx-faq\">\n<h2>Foire aux questions<\/h2>\n<details>\n<summary>En quoi l&#039;usure d&#039;une bo\u00eete de vitesses CYLO diff\u00e8re-t-elle de celle d&#039;une bo\u00eete de vitesses plan\u00e9taire\u00a0?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Un engrenage cyclo\u00efdal r\u00e9partit la charge sur le profil du disque et plusieurs axes annulaires, au lieu de la concentrer sur l&#039;engr\u00e8nement des dents. L&#039;usure se manifeste g\u00e9n\u00e9ralement par une usure du profil du disque et une usure irr\u00e9guli\u00e8re des axes, contrairement aux piq\u00fbres observ\u00e9es sur les engrenages conventionnels\u00a0; l&#039;inspection porte donc sur diff\u00e9rentes surfaces.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Sentrimax est-il un centre de service agr\u00e9\u00e9 Sumitomo\u00a0?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Non. Sentrimax est un prestataire ind\u00e9pendant de services de maintenance, de r\u00e9paration et d&#039;exploitation (MRO) pour centrifugeuses. Nous assurons la maintenance des r\u00e9ducteurs Sumitomo CYCLO et d&#039;autres marques dans le cadre de nos services de r\u00e9paration de r\u00e9ducteurs, mais nous ne sommes ni affili\u00e9s \u00e0, ni autoris\u00e9s par, ni approuv\u00e9s par Sumitomo ou tout autre fabricant.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Une bo\u00eete de vitesses CYCLO peut-elle \u00eatre r\u00e9par\u00e9e ou doit-elle \u00eatre enti\u00e8rement remplac\u00e9e\u00a0?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Dans la plupart des cas, il est possible de le remettre en \u00e9tat. Le disque cyclo\u00efdal, les axes annulaires, l&#039;arbre excentrique et les roulements sont inspect\u00e9s individuellement, et seuls les composants us\u00e9s au-del\u00e0 des tol\u00e9rances acceptables sont remplac\u00e9s. Le remplacement complet n&#039;est recommand\u00e9 que lorsque les dommages ou l&#039;usure du carter ne peuvent \u00eatre corrig\u00e9s par usinage.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>L&#039;entretien d&#039;un r\u00e9ducteur CYCLO affecte-t-il le r\u00e9glage de la vitesse diff\u00e9rentielle de la centrifugeuse\u00a0?<\/summary>\n<div class=\"sx-faq-a\">\n<p>Une reconstruction correctement effectu\u00e9e r\u00e9tablit le rapport de vitesse diff\u00e9rentielle d&#039;origine, car la g\u00e9om\u00e9trie du disque et de l&#039;axe qui le produit est inspect\u00e9e et r\u00e9par\u00e9e conform\u00e9ment aux sp\u00e9cifications. Tout \u00e9cart est identifi\u00e9 et corrig\u00e9 avant le remontage et l&#039;\u00e9quilibrage de la bo\u00eete de vitesses.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Que dois-je v\u00e9rifier avant de supposer que ma bo\u00eete de vitesses est de type CYCLO\u00a0?<\/summary>\n<div class=\"sx-faq-a\">\n<p>La plaque signal\u00e9tique de la bo\u00eete de vitesses ou la documentation d&#039;origine indiquent g\u00e9n\u00e9ralement sa marque et son mod\u00e8le. Si ces informations sont indisponibles, nos techniciens v\u00e9rifient le type de bo\u00eete de vitesses lors de l&#039;inspection initiale, car la structure interne d&#039;une transmission cyclo\u00efdale est visiblement diff\u00e9rente de celle d&#039;un engrenage plan\u00e9taire.<\/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\/centrifuge-gearbox-repair\/\">Renseignez-vous sur l&#039;entretien des bo\u00eetes de vitesses CYCLO<\/a><\/section>\n<\/div>\n<p><!-- SX-AIU:END --><\/p>","protected":false},"excerpt":{"rendered":"<p>A CYCLO gearbox uses an eccentric cycloidal disc drive instead of conventional gear teeth to set the bowl-to-scroll differential speed on a decanter centrifuge. Sentrimax services CYCLO-brand gearboxes, including Sumitomo units, by inspecting the cycloidal discs and pins for wear, machining or replacing worn components, and re-balancing the rebuilt assembly to ISO G 0.5.<\/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-3045","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 services CYCLO cycloidal centrifuge gearboxes, including Sumitomo units, inspecting the discs and pins and rebalancing the assembly 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\/cyclo-gearbox-service\/\" \/>\n\t<meta name=\"generator\" 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