{"id":2180,"date":"2026-04-21T03:03:30","date_gmt":"2026-04-21T03:03:30","guid":{"rendered":"https:\/\/planetary-gear-box.top\/product\/ep321l2-two-stage-in-line-planetary-gearbox-replacement-for-trasmital-bonfiglioli-321l2\/"},"modified":"2026-04-21T03:03:30","modified_gmt":"2026-04-21T03:03:30","slug":"ep321l2-two-stage-in-line-planetary-gearbox-replacement-for-trasmital-bonfiglioli-321l2","status":"publish","type":"product","link":"https:\/\/planetary-gear-box.top\/ml\/product\/ep321l2-two-stage-in-line-planetary-gearbox-replacement-for-trasmital-bonfiglioli-321l2\/","title":{"rendered":"EP321L2 Two-Stage In-Line Planetary Gearbox Replacement for Trasmital Bonfiglioli 321L2"},"content":{"rendered":"
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EP321L2 Planetary Gearbox — Direct Replacement for Trasmital Bonfiglioli 321L2<\/h2>\n

The Ever Power EP321L2<\/strong> is a In-Line planetary gearbox<\/strong> engineered as a dimensional and performance replacement for the Trasmital Bonfiglioli 321L2<\/strong>. Built on a two-stage architecture with a nominal ratio window of 12:1 to 40:1<\/strong>, it delivers approximately 260,000 Nm<\/strong> of nominal output torque while preserving the original mounting footprint so field retrofits are straightforward. Learn more about our gearbox programs<\/a>.<\/p>\n

\"EP321L2<\/p>\n

1. Product Overview<\/h2>\n

The EP321L2<\/strong> belongs to Ever Power's heavy-duty planetary reducer line developed specifically as a form-fit-function alternative to Italian-built 321-frame originals. Industries routinely deployed on this frame include:<\/p>\n

Sugar Mills<\/span>Paper & Pulp<\/span>Rubber Processing<\/span>Chemical Mixers<\/span><\/div>\n

Core strengths at a glance:<\/strong> drop-in mounting interface, carburized and ground planet gears, modular stage stacking, IP65 shaft sealing, bi-directional torque rating, and synthetic-oil-ready housing ventilation. Every unit leaves the factory with a serial number, run-in report, and torque-versus-speed certificate.<\/p>\n

2. Technical Parameters<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nEP321L2 Specification<\/th>\n<\/tr>\n<\/thead>\n
Frame Size<\/td>\n321<\/td>\n<\/tr>\n
Configuration<\/td>\nin-line (coaxial) output<\/td>\n<\/tr>\n
Number of Planetary Stages<\/td>\n2<\/td>\n<\/tr>\n
Nominal Ratio Window<\/td>\n12:1 to 40:1<\/td>\n<\/tr>\n
Nominal Output Torque (T2N)<\/td>\nup to 260,000 Nm<\/td>\n<\/tr>\n
Peak Torque (T2max)<\/td>\n2.0 to 2.5 x T2N<\/td>\n<\/tr>\n
Max Input Speed<\/td>\n3,000 rpm (continuous 2,000 rpm)<\/td>\n<\/tr>\n
Mechanical Efficiency<\/td>\n97% per stage (in-line); 94% per stage (right-angle)<\/td>\n<\/tr>\n
Backlash (Standard \/ Precision)<\/td>\n<15 arcmin \/ <6 arcmin<\/td>\n<\/tr>\n
Bearing Life L10h<\/td>\n20,000 h (nominal load)<\/td>\n<\/tr>\n
Oil Sump Temperature<\/td>\n-20 C to +95 C (synthetic to +110 C)<\/td>\n<\/tr>\n
Ingress Protection<\/td>\nIP65 shaft seals, IP55 breather<\/td>\n<\/tr>\n
Approximate Dry Weight<\/td>\n2,400 kg<\/td>\n<\/tr>\n
Paint System<\/td>\nC4M (coastal medium) epoxy + polyurethane<\/td>\n<\/tr>\n
Mounting Options<\/td>\nFlange, foot, shaft-mount, torque arm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3. Working Principle and Structure<\/h2>\n

The EP321L2 uses an epicyclic gear train in which a central sun gear<\/strong> drives three or four planet gears<\/strong> held by a rigid planet carrier. The planets orbit inside a stationary internal ring gear<\/strong>, with output taken from the carrier shaft. Torque is split across the planet set so each tooth carries only a fraction of total load, yielding very high torque density per unit mass. In multi-stage variants, successive planet sets are cascaded inside the same housing, multiplying the total ratio while keeping the output coaxial with the input.<\/p>\n

\"Planetary<\/p>\n

The EP321L2 is built around a one-piece forged ductile-iron housing, a solid forged planet carrier, carburized and ground alloy steel gears, taper-roller output bearings, and twin-lip nitrile rotary seals with a dust-exclusion ring.<\/p>\n

4. Core Advantages<\/h2>\n
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★ Reduced Total Cost<\/div>\n
Competitive purchase price combined with long service life lowers lifetime ownership cost significantly.<\/div>\n<\/div>\n
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★ Custom Shaft Ends<\/div>\n
Hollow, solid, splined, shrink-disc, and hirth-joint output options matched to existing drivelines.<\/div>\n<\/div>\n
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★ Fast Engineering Support<\/div>\n
Dedicated application engineer responds within 12 hours with torque, thermal, and bearing life checks.<\/div>\n<\/div>\n
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★ Reverse Engineering<\/div>\n
Unknown or obsolete originals are redrawn from sample parts when data sheets no longer exist.<\/div>\n<\/div>\n
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★ Combined Motor Supply<\/div>\n
Bundled IE3 or IE4 electric motor saves commissioning time and consolidates vendor interfaces.<\/div>\n<\/div>\n
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★ Documented Quality Trail<\/div>\n
Each unit leaves with run-in report, oil fill record, torque curve, and serial traceability.<\/div>\n<\/div>\n<\/div>\n

5. Structure and Material Craftsmanship<\/h2>\n

Every EP321L2 housing is cast from GGG50 ductile iron and stress-relieved before machining to keep critical bores within 0.02 mm of tolerance over the full operating temperature range. Planet and sun gears use 20CrMnMo<\/strong> alloy steel, case-carburized to a surface hardness of HRC 58-62 over a 1.0 to 1.6 mm case depth, then profile-ground to ISO quality grade 6. The planet carrier is forged from SCM440 and induction hardened at bearing seats. Output shafts are manufactured from 42CrMo4V quenched-and-tempered steel, with keyways broached to ISO P9 and splines cut to DIN 5480. Bearing selection pairs SKF or NSK taper rollers on the output with precision deep-groove bearings on the input, sized for bucket-strike shock loads with a 1.6 minimum safety factor. The internal ring gear is a nitrided 34CrAlNi7 sleeve pressed into the housing, providing long wear life without weakening the casing. Read more about our factory capability<\/a>.<\/p>\n

\"Material<\/p>\n

6. Typical Application Scenarios<\/h2>\n
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⚙ Mining Haulage<\/div>\n
Apron feeders and belt conveyors under abrasive bulk loads. Planet gears carry shock torque from lump impacts while bearings handle variable radial load from sag.<\/div>\n<\/div>\n
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⚙ Wind Energy<\/div>\n
Pitch adjustment and yaw orientation drives balancing occasional high-duty positioning with long idle time. Holding brake compatibility is critical.<\/div>\n<\/div>\n
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⚙ Marine & Offshore<\/div>\n
Deck cranes, anchor winches, and mooring hoists where ingress protection and corrosion resistance override pure power density considerations.<\/div>\n<\/div>\n<\/div>\n

7. Selection Guide<\/h2>\n

To select the correct EP321L2 configuration, please confirm the following parameters. Our application engineers will size the unit against your duty cycle and environmental conditions.<\/p>\n

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