![\"311](\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/07\/311-Series-Planetary-Gear-Reducer-300x300.webp\" "\\"\\"")
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311 Series \u00b7 300 Family Inline Planetary<\/p>\n
311 Series Planetary Gear Reducer \u2014 40,000 Nm Inline Drive, 311L1 to 311R4<\/h2>\n
The 311 Series is a high-torque Inline Planetary Gear Reducer<\/strong> rated at 40,000 Nm continuous output, positioned within the 300-family as the step between the 309 (18,000 Nm) and 313 (55,000 Nm). Seven variants \u2014 311L1, 311L2, 311L3, 311L4, 311R2, 311R3, and 311R4 \u2014 cover single-stage through four-stage reduction in both inline (L) and ring-output (R) output configurations. The Planetary Gearbox<\/strong> accepts IEC and NEMA electric motor flanges, axial-piston hydraulic motors, orbit motors, and plain solid input shafts, making it compatible with the widest range of prime movers in the 300-series family. All mounting dimensions are consistent with equivalent models from Bonfiglioli, Bosch Rexroth, and other major drive brands in this torque class.<\/p>\n<\/div>\n 40,000 Nm<\/p>\n Rated Output Torque<\/p>\n<\/div>\n 3.4 \u2013 9,000<\/p>\n Gear Ratio Range<\/p>\n<\/div>\n 540 kW<\/p>\n Max Transmissible Power<\/p>\n<\/div>\n 7 Variants<\/p>\n L1 \/ L2 \/ L3 \/ L4 \/ R2 \/ R3 \/ R4<\/p>\n<\/div>\n<\/div>\n The 300 series spans 1,000 Nm to 500,000 Nm across 16 frame sizes. The 311 occupies the mid-heavy bracket \u2014 enough torque for large conveyor and mixer drives, compact enough to fit in a mobile machine chassis.<\/p>\n Full 300-series range (300\u2013321) available. Contact us if your load requirement falls between listed sizes \u2014 we identify the correct frame.<\/p>\n Each planetary stage in the 311 Series follows the standard fixed-ring-gear formula. The digit in the model code (L1, L2, L3, L4) directly tells you how many stages are stacked.<\/p>\n Worked example \u2014 311L3:<\/strong> Three stages, each at 5:1 \u2192 total ratio = 5 \u00d7 5 \u00d7 5 = 125:1<\/strong>. With a 1,450 RPM motor, output shaft speed = 1,450 \u00f7 125 = 11.6 RPM<\/strong> at 40,000 Nm.<\/p>\n Finding the right stage count:<\/strong> Divide your motor speed by the required output speed to get the target ratio. Need 8 RPM from 1,450 RPM? Required ratio \u2248 181:1 \u2014 a 311L4 four-stage unit covers this range.<\/p>\n Send us your motor RPM, target output RPM, and load profile. We select the correct 311 variant and confirm whether the duty cycle falls within continuous or peak torque limits.<\/p>\n Large Conveyor Drives<\/p>\n 40,000 Nm rated output handles head-pulley drives on overland conveyors carrying 800\u20131,500 t\/h. The 311L3 with a ratio of 100\u2013200:1 covers most medium-duty mine conveyor starting torque requirements.<\/p>\n<\/div>\n Mixer & Agitator Drives<\/p>\n Twin-shaft concrete mixers, biogas digesters, and high-viscosity industrial agitators where S3 intermittent duty peaks exceed 35,000 Nm on start-up. The 311 absorbs these peaks without de-rating.<\/p>\n<\/div>\n Marine Winch Systems<\/p>\n 311R-series units (ring-output) couple directly to winch drum flanges on anchor-handling, mooring, and aquaculture feeding winches, eliminating intermediate shaft and coupling hardware.<\/p>\n<\/div>\n Construction Equipment<\/p>\n Concrete pump truck drive heads, road milling drum drives, and piling machine rotary heads \u2014 applications where the gearbox must absorb material impact loads of up to 2\u00d7 rated torque during cut-in.<\/p>\n<\/div>\n Slewing & Turning Drives<\/p>\n Crane slewing rings, ship thruster drive trains, and solar-tracker azimuth drives where a compact Planetary Gearbox<\/strong> provides precise, high-torque positioning without worm gear efficiency losses.<\/p>\n<\/div>\n<\/div>\n The 311 Series input and output interfaces accept the following components directly. Sourcing the drive system as a matched package avoids interface mis-matches and consolidates freight.<\/p>\n Specify or Order Today<\/p>\n Get a Quote on the 311 Series Planetary Gear Reducer \u2014 L2 & L3 Ship in 5\u20137 Days<\/p>\n Tell us your variant (311L1 \/ 311L2 \/ 311R3 etc.), required gear ratio, input configuration, and quantity. We return a confirmed price, dimensional drawing, and lead time within 24 hours.<\/p>\n 311L1 \/ L2 \/ L3 \/ L4 \/ R2 \/ R3 \/ R4 \u00b7 40,000 Nm \u00b7 IEC \/ NEMA \/ hydraulic input \u00b7 Volume pricing from 5 units<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":" 311 Series Planetary Gear Reducer, 40,000 Nm, ratios 3.4\u20139,000, up to 540 kW. Inline & ring-output variants: 311L1\u2013311R4. IEC\/NEMA & hydraulic inputs. L2 & L3 ship in 5\u20137 days.<\/p>","protected":false},"featured_media":1341,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[49],"product_tag":[],"class_list":["post-1339","product","type-product","status-publish","has-post-thumbnail","product_cat-in-line-planetary-reducer","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/product\/1339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/media\/1341"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/media?parent=1339"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/product_brand?post=1339"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/product_cat?post=1339"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/de_at\/wp-json\/wp\/v2\/product_tag?post=1339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}311 Series Planetary Gear Reducer \u2014 Technical Specifications<\/h2>\n
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\n \nParameter<\/th>\n Value<\/th>\n<\/tr>\n<\/thead>\n \n Series & Variants<\/td>\n 311L1 \u00b7 311L2 \u00b7 311L3 \u00b7 311L4 \u00b7 311R2 \u00b7 311R3 \u00b7 311R4<\/td>\n<\/tr>\n \n Rated Output Torque<\/td>\n 40,000 Nm<\/strong><\/td>\n<\/tr>\n \n Max Transmissible Power<\/td>\n Up to 540 kW<\/td>\n<\/tr>\n \n Gear Ratio Range<\/td>\n 3.4 \u2013 9,000<\/td>\n<\/tr>\n \n Gear Unit Configuration<\/td>\n Inline (L-series) \u00b7 Ring output (R-series)<\/td>\n<\/tr>\n \n Stage Count<\/td>\n L1 = 1 stage \u00b7 L2 = 2 stages \u00b7 L3 = 3 stages \u00b7 L4 = 4 stages \u00b7 R2 \/ R3 \/ R4 = ring-output equivalents<\/td>\n<\/tr>\n \n Output Mounting<\/td>\n Foot mount \u00b7 Flange mount<\/td>\n<\/tr>\n \n Output Shaft Options<\/td>\n Solid with key \u00b7 Splined solid \u00b7 Splined hollow \u00b7 Hollow with shrink disc<\/td>\n<\/tr>\n \n Input Configurations<\/td>\n IEC \/ NEMA motor adaptors \u00b7 Flanged axial-piston hydraulic motor \u00b7 Orbit motor \u00b7 Solid input shaft<\/td>\n<\/tr>\n \n Brake Options<\/td>\n Hydraulically released parking brake \u00b7 DC electric brake \u00b7 AC electric brake<\/td>\n<\/tr>\n \n 300-Family Position<\/td>\n Sits between 309 Series (18,000 Nm) and 313 Series (55,000 Nm)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Where the 311 Planetary Gear Reducer Sits in the 300-Series Range<\/h2>\n
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\n \nSeries<\/th>\n Rated Torque (Nm)<\/th>\n Position<\/th>\n<\/tr>\n<\/thead>\n \n 309<\/td>\n 18,000<\/td>\n Below 311<\/td>\n<\/tr>\n \n 310<\/td>\n 25,000<\/td>\n Below 311<\/td>\n<\/tr>\n \n 311 \u2605 This Product<\/td>\n 40,000<\/td>\n Current<\/td>\n<\/tr>\n \n 313<\/td>\n 55,000<\/td>\n Above 311<\/td>\n<\/tr>\n \n 315<\/td>\n 100,000<\/td>\n Above 311<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n ![\"\"](\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/03\/hzpt-logo-80px-1.png\" "\\"\\""){kind=logo}
<\/h2>\nGear Ratio Calculation for the 311 Series Planetary Gear Reducer<\/h2>\n
\nZring<\/sub> = ring gear teeth \u00b7 Zsun<\/sub> = sun gear teeth<\/span>Multi-stage (L2 \/ L3 \/ L4)<\/span>: itotal<\/sub> = i1<\/sub> \u00d7 i2<\/sub> \u00d7 i3<\/sub> \u00d7 i4<\/sub><\/div>\nWhat Makes the 311 Series Stand Out Among Inline Planetary Gear Reducers<\/h2>\n
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\n40,000 Nm in an inline housing that shares the 300-series bolt pattern.<\/strong> Engineers specifying a 309 (18,000 Nm) or 313 (55,000 Nm) can upgrade or downgrade to the 311 without changing the machine frame interface, the motor flange, or the output shaft bore. This is the practical advantage of a coherent product family.<\/li>\n
\nSeven variants from a single catalogue page.<\/strong> L1 through L4 cover ratios from 3.4 up to several thousand. R2, R3, and R4 add ring-output configurations for wheel-drive and winch-drum integrations where the output must distribute load radially rather than through a single shaft.<\/li>\n
\nThe 311L2 Planetary Gear Reducer is a proven replacement for Bonfiglioli 311L2 and equivalent units from Bosch Rexroth and Reggiana Riduttori.<\/strong> Mounting dimensions \u2014 bolt circle, shaft diameter, and input flange pattern \u2014 are matched to the original. No adapter plates or additional machining are required.<\/li>\n
\nFour output shaft configurations cover the majority of OEM interfaces.<\/strong> Solid keyed, splined solid, splined hollow, and hollow with shrink disc are all available within the 311 frame \u2014 specifying the output type adds nothing to lead time on stocked L2 and L3 variants.<\/li>\n
\nBrake options factory-fitted, not field-added.<\/strong> The hydraulically released parking brake, DC brake, and AC brake are all integrated inside the housing envelope. Adding a brake does not extend the axial length or require a separate caliper bracket \u2014 critical when fitting inside a compact mobile machine frame.<\/li>\n<\/ul>\nIndustry Applications for the 311 Inline Planetary Gear Reducer<\/h2>\n
Matched Components for a Complete 311 Series Drive System<\/h2>\n
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\n \nComponent<\/th>\n Specification<\/th>\n How It Connects<\/th>\n<\/tr>\n<\/thead>\n \n IE3 Electric Motor<\/a><\/td>\n 55\u2013200 kW, 4-pole, IEC B5 flange, 1,450 RPM<\/td>\n Bolts to IEC adaptor on 311 input \u2014 no intermediate coupling required on flanged versions<\/td>\n<\/tr>\n \n Agricultural Drive Sprocket<\/a><\/td>\n ANSI #120\u2013#160 roller chain, 13\u201319T, splined or keyed bore<\/td>\n Mounts on splined solid output shaft for chain-driven agricultural and conveyor secondary stages<\/td>\n<\/tr>\n \n Marine Winch Drum<\/td>\n \u00d8 350\u2013600 mm, 12\u201320 mm wire rope, SWL 10\u201350 t<\/td>\n 311R-series ring output couples directly to drum flange; no external bearing housing required<\/td>\n<\/tr>\n \n Hydraulic Axial-Piston Motor<\/td>\n SAE B\/C flange, 200\u2013500 cc\/rev, 350\u2013500 bar rated pressure<\/td>\n Flanges directly to 311 hydraulic input port; standard on mobile winch, crane, and track drive builds<\/td>\n<\/tr>\n \n Torsionally Rigid Disc Coupling<\/td>\n 20,000\u201360,000 Nm, steel disc pack, SAE flywheel bore<\/td>\n Connects motor to 311 solid input shaft; compensates angular misalignment up to \u00b10.5\u00b0 without radial load on input bearing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Frequently Asked Questions \u2014 311 Series Planetary Gear Reducer<\/h2>\n
\nSend Your Specification<\/a><\/div>\n