[{"data":1,"prerenderedAt":627},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fauxiliary-cylinder:*":258,"guides:topics:clamp-cylinder:\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fauxiliary-cylinder:path,title,short":485,"guides:page:\u002Finjection-molding-machine-parts\u002Fclamp-cylinder:diagram":502,"diagram:id:clamp-cylinder":503,"catalog:parts::MC-CC-02":618},{"categories":4,"machines":132,"zones":212,"totals":255},[5,35,59,122],{"id":6,"name":7,"slug":8,"description":9,"partCount":10,"subcategories":11},"EC","Electrical Components","electrical","Electrical systems and components for injection molding machines including heaters, thermocouples, servo motors, and controllers.",11,[12,17,22,27,31],{"id":13,"name":14,"slug":15,"partCount":16},"EC-CBC","Circuit Boards & Controllers","circuit-boards",4,{"id":18,"name":19,"slug":20,"partCount":21},"EC-CE","Connectors & Cables","connectors-cables",2,{"id":23,"name":24,"slug":25,"partCount":26},"EC-GEP","Servo Motors & Drives","servo-motors",1,{"id":28,"name":29,"slug":30,"partCount":21},"EC-HT","Heaters","heaters",{"id":32,"name":33,"slug":34,"partCount":21},"EC-SF","Safety Components","safety",{"id":36,"name":37,"slug":38,"description":39,"partCount":40,"subcategories":41},"HY","Hydraulic Components","hydraulic","Complete range of hydraulic system components including pumps, valves, motors, and pressure controls for injection molding machines.",14,[42,46,51,55],{"id":43,"name":44,"slug":45,"partCount":26},"HY-AU","Accumulators","accumulators",{"id":47,"name":48,"slug":49,"partCount":50},"HY-CV","Control Valves","control-valves",6,{"id":52,"name":53,"slug":54,"partCount":26},"HY-MO","Monitors & Gauges","monitors-gauges",{"id":56,"name":57,"slug":58,"partCount":50},"HY-PW","Pumps & Motors","pumps-motors",{"id":60,"name":61,"slug":62,"description":63,"partCount":64,"subcategories":65},"MC","Mechanical Components","mechanical","Mechanical parts and assemblies including barrels, screws, tie bars, bushings, platens, and clamping components.",42,[66,71,75,80,85,89,93,97,101,105,109,114,118],{"id":67,"name":68,"slug":69,"partCount":70},"MC-BC","Barrels & Cylinders","barrels-cylinders",5,{"id":72,"name":73,"slug":74,"partCount":16},"MC-SB","Screw Barrels & Seals","screws",{"id":76,"name":77,"slug":78,"partCount":79},"MC-TC","Tie Bars & Columns","tie-bars",7,{"id":81,"name":82,"slug":83,"partCount":84},"MC-GZ","Bushings & Guides","bushings-guides",8,{"id":86,"name":87,"slug":88,"partCount":26},"MC-PP","Platens","platens",{"id":90,"name":91,"slug":92,"partCount":70},"MC-TL","Toggle & Links","toggle-links",{"id":94,"name":95,"slug":96,"partCount":21},"MC-CC","Clamping Components","clamping",{"id":98,"name":99,"slug":100,"partCount":21},"MC-GMP","Tools & Accessories","tools-accessories",{"id":102,"name":103,"slug":104,"partCount":21},"MC-ES","End Caps & Plates","end-caps",{"id":106,"name":107,"slug":108,"partCount":26},"MC-SR","Seals & Rings","seals-rings",{"id":110,"name":111,"slug":112,"partCount":113},"MC-JM","Joints & Mounts","joints-mounts",3,{"id":115,"name":116,"slug":117,"partCount":26},"MC-SG","Safety Guards","safety-guards",{"id":119,"name":120,"slug":121,"partCount":26},"MC-CR","Clamping Mechanism","clamping-mechanism",{"id":123,"name":124,"slug":125,"description":126,"partCount":113,"subcategories":127},"O","Other Components","other","Additional components including filters, cooling systems, lubrication parts, and other auxiliary equipment.",[128],{"id":129,"name":130,"slug":131,"partCount":113},"O-TC","Filters & Cooling","filters-cooling",[133,143,161,172,180,188,194,200,205],{"id":134,"name":135,"slug":134,"series":136,"partCount":142},"haitian","Haitian International",[137,138,139,140,141],"Mars Series (MA)","Jupiter Series (JU)","Zhafir Venus Series (VE)","Zhafir Zeres Series (ZE)","Zhafir Jeres Series (JE)",68,{"id":144,"name":145,"slug":144,"series":146,"partCount":160},"yizumi","Yizumi",[147,148,149,150,151,152,153,154,155,156,157,158,159],"A6 Series","A5-EU Series","A5-N Series","SKIII Series","DP Series","D1 Series","FF Series","FF-M Series","P Series","CG-P Series","VM Series","SPET Series","LSR Series",12,{"id":162,"name":163,"slug":162,"series":164,"partCount":171},"chen-hsong","Chen Hsong",[165,166,167,168,169,170],"JETMASTER MK Series","JETMASTER SVP Series","SUPERMASTER Series","EASYMASTER Series","SPARK Series","JETMASTER C2 Series",10,{"id":173,"name":174,"slug":173,"series":175,"partCount":179},"tederic","Tederic",[176,177,178],"NEO Series","D Series (Two-Platen)","DE Series (All-Electric)",0,{"id":181,"name":182,"slug":181,"series":183,"partCount":179},"borch","Borch",[184,185,186,187],"BU Series (Two-Platen)","BS-III Series (Servo)","BE Series (All-Electric)","BM Series (Multi-color)",{"id":189,"name":190,"slug":189,"series":191,"partCount":179},"log-machine","LOG Machine",[192,193],"LOG-SE Series","LOG-EE Series (All-Electric)",{"id":195,"name":196,"slug":195,"series":197,"partCount":179},"donghua","Donghua",[198,199],"DH Series (Servo)","DH-TP Series (Two-Platen)",{"id":201,"name":202,"slug":201,"series":203,"partCount":179},"sunbun","Sunbun",[204],"Sunbun Servo Series",{"id":206,"name":207,"slug":206,"series":208,"partCount":179},"lijin","L.K. Machinery (Lijin)",[209,210,211],"POTENZA Series","FORZA Series (Two-Platen)","ELETTRICA Series (All-Electric)",[213,217,221,225,228,231,235,238,242,248,251],{"id":214,"number":26,"name":215,"role":216,"partCount":21},"clamp-cylinder","Clamping cylinder","The hydraulic cylinder behind the rear platen. It drives the crosshead that straightens the toggle links, which opens and closes the mold and builds the clamping force.",{"id":218,"number":21,"name":219,"role":220,"partCount":50},"toggle","Toggle mechanism","Links, pins and bushings between the rear and moving platens. They multiply the force of the clamping cylinder and lock the mold shut while plastic is injected.",{"id":222,"number":113,"name":223,"role":224,"partCount":113},"ejector","Ejector","A small cylinder behind the moving platen that pushes the ejector rods and plate forward to release the finished part from the mold.",{"id":78,"number":16,"name":226,"role":227,"partCount":40},"Tie bars & bushings","Four steel columns that join the platens, guide the moving platen and carry the clamping force. Tie bar nuts lock them in place; bushings guide the moving platen along them.",{"id":88,"number":70,"name":229,"role":230,"partCount":21},"Platens & mold plates","The fixed and moving platens carry the two halves of the mold; the rear platen anchors the toggle. Locating rings and clamping plates center and hold the mold.",{"id":232,"number":50,"name":233,"role":234,"partCount":50},"barrel-screw","Barrel, screw & nozzle","The screw turns inside the heated barrel to melt and mix the plastic, then moves forward to inject it through the nozzle into the mold. The screw tip and check ring stop melt from flowing back.",{"id":30,"number":79,"name":236,"role":237,"partCount":113},"Heater bands & sensors","Heater bands around the barrel and nozzle melt the plastic. Thermocouples measure each heating zone so the controller can hold the set temperature.",{"id":239,"number":84,"name":240,"role":241,"partCount":79},"injection-unit","Injection unit","Injection cylinders push the screw forward, the hydraulic (plasticizing) motor turns it, and the carriage moves the unit against the mold on its guide rails.",{"id":243,"number":244,"name":245,"role":246,"partCount":247},"hydraulics",9,"Hydraulic unit","The pump, motor, valves, accumulator, filters and oil cooler in the machine base. They supply and control the oil pressure for every movement of the machine.",16,{"id":8,"number":171,"name":249,"role":250,"partCount":244},"Electrical cabinet","The controller, I\u002FO and drive boards, servo drives, contactors and safety switches that run and protect the machine.",{"id":252,"number":10,"name":253,"role":254,"partCount":21},"feet","Machine feet","Leveling bolts and anti-vibration pads under the machine base that keep the machine level and stop vibration spreading to the floor.",{"parts":256,"subcategories":257},70,23,{"id":259,"title":260,"body":261,"description":457,"diagram":458,"extension":459,"faq":460,"item":473,"lastModified":474,"meta":475,"navigation":476,"order":70,"parts":477,"path":479,"seo":480,"seoTitle":481,"short":482,"stem":483,"__hash__":484},"guides\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fauxiliary-cylinder.md","Auxiliary hydraulic cylinder of an injection molding machine",{"type":262,"value":263,"toc":448},"minimark",[264,276,281,284,318,326,330,333,341,345,370,374,377,381,412,416,436],[265,266,267,268,272,273,275],"p",{},"An auxiliary hydraulic cylinder is a smaller cylinder that works beside the main clamping cylinder of an injection molding machine. Depending on the machine, it adds force as a ",[269,270,271],"strong",{},"clamping booster",", moves the platen quickly before the main cylinder takes over, or drives the ",[269,274,222],{},". It is built like the main cylinder, with a barrel, piston, seals and rod, so it wears and is serviced the same way. In the drawing, the auxiliary cylinder is the small cylinder below the main clamping cylinder.",[277,278,280],"h2",{"id":279},"where-auxiliary-cylinders-are-used","Where auxiliary cylinders are used",[265,282,283],{},"The name covers several small cylinders, and which ones a machine has depends on its design:",[285,286,287,294,300,312],"ul",{},[288,289,290,293],"li",{},[269,291,292],{},"Clamping booster",": a cylinder that adds its force to the main clamping cylinder during clamp-up.",[288,295,296,299],{},[269,297,298],{},"Fast-stroke (traverse) cylinders",": on direct hydraulic clamps, small cylinders move the platen quickly over most of its travel, and the large clamping cylinder builds the force over the last short stroke.",[288,301,302,305,306,311],{},[269,303,304],{},"Ejector drive",": a hydraulic cylinder behind the moving platen that pushes the ejector plate. See the ",[307,308,310],"a",{"href":309},"\u002Finjection-molding-machine-parts\u002Fejector\u002Fejector-cylinder\u002F","ejector cylinder"," guide.",[288,313,314,317],{},[269,315,316],{},"Other movements",": the carriage cylinders that move the injection unit forward and back, and core-pull cylinders on the mold, connected to the machine's core-pull valves.",[265,319,320,321,325],{},"The ",[307,322,324],{"href":323},"\u002Fparts\u002Fmc-cc-02\u002F","auxiliary cylinder"," we supply is used as a secondary clamping booster or an auxiliary ejection drive, and is made of 45# steel.",[277,327,329],{"id":328},"how-an-auxiliary-cylinder-works","How an auxiliary cylinder works",[265,331,332],{},"It is a double-acting cylinder: oil pumped into one end pushes the piston, and the oil on the other side returns to the tank. Its force is the oil pressure multiplied by the piston area, and its speed is the pump flow divided by that area. A small bore therefore gives less force but more speed for the same flow. That is why machines combine small, fast cylinders with a large, slow, strong one: the small cylinders do the long movements and the large one does the clamping.",[265,334,335,336,340],{},"The oil reaches the auxiliary cylinder through its own valve in the ",[307,337,339],{"href":338},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fvalve-manifold\u002F","valve manifold",", so a fault in the cylinder and a fault in its valve can look the same.",[277,342,344],{"id":343},"signs-of-a-worn-auxiliary-cylinder","Signs of a worn auxiliary cylinder",[285,346,347,355,358,361,364,367],{},[288,348,349,350,354],{},"Oil on the rod or dripping from the front head: worn ",[307,351,353],{"href":352},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Frod-seals\u002F","rod seals and wiper",".",[288,356,357],{},"Slow or jerky movement, especially when it starts.",[288,359,360],{},"The movement drifts when the valve is closed, or the ejector does not stay back.",[288,362,363],{},"Weak force: the ejector struggles to push the part off, or clamp-up takes longer.",[288,365,366],{},"Knocking at the end of the stroke, or loose mounting bolts.",[288,368,369],{},"Wear on one side of the rod, a sign that the cylinder is misaligned with what it pushes.",[277,371,373],{"id":372},"why-auxiliary-cylinders-wear","Why auxiliary cylinders wear",[265,375,376],{},"The causes are the same as for the main cylinder: dirty or hot oil, a damaged rod, worn piston seals, and pressure peaks from fast valve switching. Ejector cylinders sit behind the moving platen, close to the mold area, where heat, water and plastic dust reach the rod, and they stroke several times per cycle when multiple ejection is set. Misalignment between the cylinder and the part it drives adds side load that wears the guide ring and the rod seals.",[277,378,380],{"id":379},"checking-and-servicing","Checking and servicing",[382,383,384,387,390,393,401,409],"ol",{},[288,385,386],{},"Make the machine safe: stop the pump, lock out the power and release all pressure, including the accumulator if fitted.",[288,388,389],{},"Inspect the rod for scratches and pitting, and the mounting, clevis or flange and rod end for wear and play.",[288,391,392],{},"Check the alignment of the cylinder with the part it drives.",[288,394,395,396,400],{},"If the movement drifts or lacks force, test for piston seal bypass as described in ",[307,397,399],{"href":398},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fpiston-seals\u002F","piston seals",", and check its valve.",[288,402,403,404,408],{},"Reseal the cylinder following ",[307,405,407],{"href":406},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fcylinder-seal-replacement\u002F","replacing cylinder seals",". Being smaller, it can usually be removed and resealed on the bench.",[288,410,411],{},"Replace the whole cylinder if the bore is scored or the rod is bent.",[277,413,415],{"id":414},"what-to-send-for-a-replacement-quote","What to send for a replacement quote",[382,417,418,421,424,427,430,433],{},[288,419,420],{},"The machine brand, model and serial number.",[288,422,423],{},"What the cylinder does: clamping booster, fast stroke, ejector or another movement.",[288,425,426],{},"The bore, rod diameter and stroke.",[288,428,429],{},"The retracted length between the mounting points, the mounting type and its dimensions.",[288,431,432],{},"The rod end thread, and the size and position of the oil ports.",[288,434,435],{},"Photos of the cylinder and its nameplate.",[265,437,438,442,443,447],{},[307,439,441],{"href":440},"\u002Frequest-quote\u002F","Request a quote",", and see the ",[307,444,446],{"href":445},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002F","clamping cylinder guide"," for how the auxiliary cylinder works with the main one.",{"title":449,"searchDepth":21,"depth":21,"links":450},"",[451,452,453,454,455,456],{"id":279,"depth":21,"text":280},{"id":328,"depth":21,"text":329},{"id":343,"depth":21,"text":344},{"id":372,"depth":21,"text":373},{"id":379,"depth":21,"text":380},{"id":414,"depth":21,"text":415},"What an auxiliary hydraulic cylinder does on an injection molding machine as a clamping booster, fast-stroke or ejector drive, its faults and how to quote it.",null,"md",[461,464,467,470],{"question":462,"answer":463},"What is an auxiliary cylinder on an injection molding machine?","It is a smaller hydraulic cylinder that works beside the main clamping cylinder. Depending on the machine it adds clamping force as a booster, moves the platen quickly before the main cylinder builds force, or drives the ejector.",{"question":465,"answer":466},"Why do some machines use small cylinders to move the platen?","A small piston needs little oil to move a given distance, so with the same pump flow it moves the platen faster. The large clamping cylinder then provides the force only over the short final stroke, which saves flow, time and energy.",{"question":468,"answer":469},"Can an auxiliary cylinder be resealed?","Yes. It has the same piston seals, rod seals, wiper and O-rings as a main cylinder, and because it is smaller it is usually easier to remove and reseal on the bench. Replace the cylinder only if the bore is scored or the rod is bent or badly damaged.",{"question":471,"answer":472},"What dimensions are needed to replace an auxiliary cylinder?","The bore, rod diameter and stroke, the retracted length between the mounting points, the mounting type and its dimensions, the rod end thread, and the size and position of the oil ports, plus the machine model and photos of the nameplate.","auxiliary","2026-11-01",{},true,[478],"MC-CC-02","\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fauxiliary-cylinder",{"title":260,"description":457},"Auxiliary Hydraulic Cylinder on Injection Molding Machines","Auxiliary cylinder","injection-molding-machine-parts\u002Fclamp-cylinder\u002Fauxiliary-cylinder","RTaCVkntEHrhujydc-L9ze8Si09aYCdmW_t8FZc8jRw",[486,490,494,498],{"path":487,"title":488,"short":489},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fpiston-seals","Hydraulic cylinder piston seals and Y-rings","Piston seals",{"path":491,"title":492,"short":493},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Frod-seals","Rod seals and wiper seals of a hydraulic cylinder","Rod seals and wipers",{"path":495,"title":496,"short":497},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fcylinder-seal-replacement","Replacing the seals of an injection molding machine cylinder","Replacing cylinder seals",{"path":499,"title":500,"short":501},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fpiston-rod-nut","Piston rod nut of a hydraulic cylinder","Piston rod nut",{"diagram":214},{"diagram":504},{"title":505,"description":506,"items":507},"Parts of a clamping cylinder","Line drawing of a hydraulic clamping cylinder cut open to show the piston, seals, rod nut and rod seals, with a small auxiliary cylinder below, numbered.",[508,526,537,553,568,582,599],{"id":509,"name":510,"role":511,"parts":512,"marker":514,"shapes":518},"barrel","Cylinder barrel and end caps","Steel tube closed by the rear cap and the front gland. Oil fed through the ports on either side of the piston moves it forward or back.",[513],"MC-CC-01",[515,516,515,517],150,24,74,{"solid":519},[520,521,522,523,524,525],"M63 64h24a3 3 0 0 1 3 3v126a3 3 0 0 1 -3 3h-24a3 3 0 0 1 -3 -3v-126a3 3 0 0 1 3 -3z","M90 74h260v12h-260z","M90 174h260v12h-260z","M353 64h28a3 3 0 0 1 3 3v126a3 3 0 0 1 -3 3h-28a3 3 0 0 1 -3 -3v-126a3 3 0 0 1 3 -3z","M68 52h14v12h-14z","M360 196h14v12h-14z",{"id":527,"name":528,"role":529,"marker":530,"shapes":534},"piston","Piston","Divides the cylinder into two oil chambers. Pressure on one side moves it, and the rod with it, forward or back.",[531,516,532,533],262,234,100,{"solid":535},[536],"M202 86h30a2 2 0 0 1 2 2v84a2 2 0 0 1 -2 2h-30a2 2 0 0 1 -2 -2v-84a2 2 0 0 1 2 -2z",{"id":538,"name":539,"role":540,"parts":541,"marker":543,"shapes":547},"piston-seals","Piston seals (Y-rings)","Seal the piston against the barrel so oil cannot pass from one chamber to the other. Leaking seals make clamping slow and weak.",[542],"MC-SB-08",[544,516,545,546],212,210,86,{"solid":548},[549,550,551,552],"M206 86h8v6h-8z","M220 86h8v6h-8z","M206 168h8v6h-8z","M220 168h8v6h-8z",{"id":554,"name":501,"role":555,"parts":556,"marker":558,"shapes":562},"rod-nut","Holds the piston on the end of the rod.",[557],"MC-SB-10",[559,560,559,561],193,336,146,{"solid":563,"line":565},[564],"M188 114h10a2 2 0 0 1 2 2v28a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-28a2 2 0 0 1 2 -2z",[566,567],"M186 124L200 124","M186 136L200 136",{"id":569,"name":570,"role":571,"marker":572,"shapes":575},"rod","Piston rod","Chrome-plated rod that carries the cylinder’s force out through the gland to the toggle crosshead.",[573,516,573,574],410,116,{"solid":576,"hidden":579},[577,578],"M236 116h206a2 2 0 0 1 2 2v24a2 2 0 0 1 -2 2h-206a2 2 0 0 1 -2 -2v-24a2 2 0 0 1 2 -2z","M446 108h10a2 2 0 0 1 2 2v40a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-40a2 2 0 0 1 2 -2z",[580,581],"M200 121L234 121","M200 139L234 139",{"id":583,"name":584,"role":585,"parts":586,"marker":588,"shapes":591},"rod-seals","Rod seals and wiper","Seal set in the front gland: the rod seals keep the oil in and the wiper keeps dirt out.",[587],"MC-SB-07",[589,516,589,590],362,110,{"solid":592},[593,594,595,596,597,598],"M358 110h8v6h-8z","M370 110h8v6h-8z","M358 144h8v6h-8z","M370 144h8v6h-8z","M380 112h4v4h-4z","M380 144h4v4h-4z",{"id":473,"name":482,"role":600,"parts":601,"marker":602,"shapes":605},"Smaller cylinder used as a clamping booster or to drive the ejector on some machines.",[478],[603,560,603,604],385,276,{"solid":606,"line":614,"hidden":616},[607,608,609,610,611,612,613],"M302 232h6a2 2 0 0 1 2 2v44a2 2 0 0 1 -2 2h-6a2 2 0 0 1 -2 -2v-44a2 2 0 0 1 2 -2z","M313 236h144a3 3 0 0 1 3 3v34a3 3 0 0 1 -3 3h-144a3 3 0 0 1 -3 -3v-34a3 3 0 0 1 3 -3z","M462 232h6a2 2 0 0 1 2 2v44a2 2 0 0 1 -2 2h-6a2 2 0 0 1 -2 -2v-44a2 2 0 0 1 2 -2z","M472 248h76a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-76a2 2 0 0 1 -2 -2v-12a2 2 0 0 1 2 -2z","M553 244h12a3 3 0 0 1 3 3v18a3 3 0 0 1 -3 3h-12a3 3 0 0 1 -3 -3v-18a3 3 0 0 1 3 -3z","M322 226h10v10h-10z","M438 226h10v10h-10z",[615],"M554 256a5 5 0 1 0 10 0a5 5 0 1 0 -10 0z",[617],"M380 238h8v36h-8z",[619],{"partNumber":478,"name":620,"subcategory":94,"subcategoryName":621,"shortDescription":622,"image":623,"inStock":476,"zone":214,"compatibleMachines":624},"Clamping Cylinder — Small \u002F Auxiliary","Clamping Cylinders","Auxiliary clamping or ejection cylinder for injection molding machine.","\u002Fpart-images\u002FMC\u002FMC-CC-02\u002F423bf4c1-6171-48d3-98d9-06feab16d665.png",[625,626],"Haitian MA Series","Haitian Jupiter Series",1793548978361]