{"id":877,"date":"2026-06-17T06:22:49","date_gmt":"2026-06-17T06:22:49","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=877"},"modified":"2026-06-17T06:22:49","modified_gmt":"2026-06-17T06:22:49","slug":"zr30-slewing-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/ja\/product\/zr30-slewing-drive-planetary-gearbox\/","title":{"rendered":"ZR30 Slewing Drive Planetary Gearbox \u2014 Right-Angle Bevel-Planetary, 2-5 Stage"},"content":{"rendered":"
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<\/p>\n

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EP-ZR30 \u2014 32,000 Nm Continuous, 58 Ratios to 3,053:1<\/h2>\n
\n
\n

\u306e EP-ZR30<\/strong> sits directly below the flagship ZR45 in the ZR slewing drive series<\/a> and delivers what the ZR45 cannot: a wide selection of 58 gear ratios across five stage configurations. Where the ZR45 concentrates on three optimised ratio points for the heaviest loads, the ZR30 provides the ratio density needed when precise speed matching is as important as raw torque capacity.<\/p>\n

At 32,000 Nm continuous and 55,000 Nm peak \u2014 19% above the published headline of 27,000 Nm \u2014 the ZR30 handles the sustained slewing loads of large excavators, shipyard gantry cranes, and heavy mining conveyor head drives. Three torque tiers (32,000 \/ 31,000 \/ 25,000 Nm) de-rate gradually across the ratio table, with 67% of all ratios (39 of 58) delivering the full 32,000 Nm without reduction.<\/p>\n

\n
\n
32,000<\/div>\n
Max Cont. Nm<\/div>\n<\/div>\n
\n
55,000<\/div>\n
Peak Nm<\/div>\n<\/div>\n
\n
58<\/div>\n
\u6bd4\u7387<\/div>\n<\/div>\n
\n
2-5<\/div>\n
\u30b9\u30c6\u30fc\u30b8<\/div>\n<\/div>\n<\/div>\n
IP67 Sealed<\/span>
\nDIN 5-6<\/span>
\n-40 to +80 deg C<\/span>
\n2,500 RPM Max<\/span><\/div>\n<\/div>\n
\"ZR30<\/div>\n
<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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ZR30 Technical Parameters \u2014 58 Ratio Configurations<\/h2>\n

Continuous torque at N2 x h = 100,000 hours. Three torque tiers (32,000 \/ 31,000 \/ 25,000 Nm) apply across all stage counts. Type codes include R16, R10, or R06 bevel sub-variant suffixes. All configurations share 2,500 rpm maximum input speed.<\/p>\n

2-Stage \u2014 ZR30**2 \/ R16 (3 Ratios)<\/h3>\n
\n\n\n\n\n\n\n\n
\u6bd4\u7387<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\n\u6700\u5927\u56de\u8ee2\u6570<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
14.19<\/td>\n32,000<\/td>\n55,000<\/td>\n2,500<\/td>\n26.5 \/ 38.0<\/td>\n<\/tr>\n
18.22<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n26.5 \/ 38.0<\/td>\n<\/tr>\n
21.62<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n26.5 \/ 38.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

3-Stage \u2014 ZR30**3 \/ R10 (10 Ratios)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u6bd4\u7387<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\n\u6700\u5927\u56de\u8ee2\u6570<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
43.43<\/td>\n32,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
51.27<\/td>\n32,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
64.30<\/td>\n32,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
70.28<\/td>\n32,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
85.36<\/td>\n31,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
88.15<\/td>\n31,000<\/td>\n55,000<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
102.53<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
109.68<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
124.03<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
132.89<\/td>\n25,000<\/td>\n46,800<\/td>\n2,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

4-Stage \u2014 ZR30**4 \/ R06 (20 Ratios) & 5-Stage \u2014 ZR30**5 \/ R06 (25 Ratios)<\/h3>\n

Combined summary for 45 high-ratio configurations. Three torque tiers apply within each stage count.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
\u30b9\u30c6\u30fc\u30b8<\/th>\n\u6bd4\u7387\u7bc4\u56f2<\/th>\nCount<\/th>\nCont. Torque (Nm)<\/th>\nPeak (Nm)<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
4-Stage<\/td>\n109.70 \u2013 209.57<\/td>\n8<\/td>\n32,000<\/td>\n55,000<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n
222.63 \u2013 305.73<\/td>\n6<\/td>\n31,000<\/td>\n55,000<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n
329.61 \u2013 615.47<\/td>\n6<\/td>\n25,000<\/td>\n46,800<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n
5-Stage<\/td>\n381.75 \u2013 776.16<\/td>\n9<\/td>\n32,000<\/td>\n55,000<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n
804.81 \u2013 1,286.91<\/td>\n8<\/td>\n31,000<\/td>\n55,000<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n
1,318.65 \u2013 3,052.94<\/td>\n8<\/td>\n25,000<\/td>\n46,800<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Full per-ratio data sheets available on request from Korea Ever-Power engineering<\/a>.<\/p>\n<\/section>\n

<\/p>\n

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Gear Metallurgy \u2014 Why 20CrMnTi at HRC 58-62 Matters at 32,000 Nm<\/h2>\n

At the 32,000 Nm torque class, gear tooth surface contact pressure exceeds 1,500 MPa on a routine basis. The choice of gear steel, heat treatment depth, and surface finish directly determines whether the tooth flanks will withstand this pressure for 20,000 hours or begin pitting within 5,000. The ZR30 uses a metallurgical approach proven across thousands of units in the ZR series.<\/p>\n

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20CrMnTi Alloy Steel<\/strong><\/p>\n

A chromium-manganese-titanium carburising steel with 0.17-0.23% carbon, 1.0-1.3% manganese, and 0.8-1.1% chromium. The titanium addition (0.04-0.10%) refines the grain structure during carburising, producing a more uniform and tougher case layer than plain CrMn steels. This composition balances case hardness (surface wear resistance) with core toughness (resistance to tooth root bending fatigue).<\/p>\n<\/div>\n

Gas Carburising Process<\/strong><\/p>\n

Gears are carburised at 920-940 deg C for 8-14 hours (depending on module size) in a controlled endothermic atmosphere to achieve a case depth of 1.2-2.0 mm. The carburised surface reaches 0.8-1.0% carbon content, which transforms to high-carbon martensite during quenching. Case depth is verified by microhardness traverse on a destructive test sample from each heat-treatment batch.<\/p>\n<\/div>\n

Quench and Temper to HRC 58-62<\/strong><\/p>\n

Oil quenching from 820-840 deg C followed by low-temperature tempering at 160-200 deg C. The resulting surface hardness of HRC 58-62 provides the contact fatigue resistance needed for 100,000-hour L10 life at rated load. The core hardness remains at HRC 30-40, providing the ductility to absorb shock loads without brittle fracture at the tooth root.<\/p>\n<\/div>\n

Profile Grinding to DIN 5-6<\/strong><\/p>\n

After heat treatment, tooth flanks are profile-ground on CNC gear grinders to DIN 5-6 accuracy class. Grinding removes the heat treatment distortion layer and produces a surface finish of Ra 0.4-0.8 micrometres. This finish quality reduces the running-in wear period and lowers the steady-state operating noise compared to hobbed-only gears, which typically achieve DIN 8-10.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"CNC<\/p>\n

Profile grinding after carburising and quenching<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Applications in the 25,000-32,000 Nm Operating Window<\/h2>\n

\"Heavy-duty<\/p>\n

\n
\n

Large Excavators (35-50 Tonne Class)<\/h3>\n

Hydraulic excavators in the 35-50 tonne operating weight range generate sustained upper-structure slewing torques of 20,000-32,000 Nm during production digging. The ZR30**2 at ratio 14.19 driven by a 200-250 cc\/rev axial piston motor at 350 bar provides the high-speed rotation and 55,000 Nm peak capacity these machines demand for aggressive loading cycles. The EP-SE track drive series<\/a> provides the matching undercarriage propulsion.<\/p>\n<\/div>\n

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Shipyard Gantry Cranes and Goliath Cranes<\/h3>\n

Shipyard goliath cranes and hull-block transporters with lifting capacities of 200-600 tonnes require slewing torques of 25,000-30,000 Nm for controlled boom or gantry rotation. The ZR30 3-stage at ratios 51:1-70:1 provides the torque density these cranes need in a frame size that fits within the tight mechanical envelopes of shipyard crane pedestals. The 58-ratio selection ensures the optimal speed match without external speed reduction<\/a> stages.<\/p>\n<\/div>\n

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Mining Conveyor Head Drives and Stackers<\/h3>\n

Overland conveyor stacker and reclaimer slewing mechanisms in open-pit mining operations rotate under constant radial loading from the boom self-weight plus material flow forces. The ZR30 5-stage at ratios 800:1-1,800:1 provides ultra-low-speed boom rotation at the full 31,000 Nm continuous, while the IP67 sealing resists the iron ore dust, coal fines, and seasonal rainfall common at surface mining sites.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Troubleshooting Quick Reference \u2014 Symptom, Cause, Action<\/h2>\n

The following guide covers the most common field observations and their probable causes. Always shut down the drive and investigate before continuing operation if any of these symptoms appear.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Symptom<\/th>\nProbable Cause<\/th>\nRecommended Action<\/th>\n<\/tr>\n<\/thead>\n
Abnormal noise \u2014 metallic clicking at mesh frequency<\/td>\nInsufficient pinion-to-ring backlash (binding), foreign object in mesh zone, or cracked tooth<\/td>\nStop and inspect the pinion teeth visually. Check backlash with a dial indicator. If a tooth is cracked or chipped, remove the unit for factory assessment.<\/td>\n<\/tr>\n
Excessive housing temperature (>100 deg C surface)<\/td>\nMotor input power exceeds Pt rating, oil level too low, wrong oil viscosity, or blocked breather valve<\/td>\nVerify oil level immediately. Check breather valve for blockage. Measure motor current and compare to the thermal duty calculation. If the issue persists after correction, add fan cooling or reduce the duty cycle.<\/td>\n<\/tr>\n
Oil leak at output seal<\/td>\nSeal lip wear, shaft surface corrosion under the seal contact band, or excessive internal pressure from blocked breather<\/td>\nClear the breather valve first (most common root cause). If the leak persists, the output seal must be replaced. Inspect the shaft surface under the seal \u2014 if corrosion pitting is present, the shaft must be polished or sleeved before fitting a new seal.<\/td>\n<\/tr>\n
Increased backlash over time<\/td>\nNormal gear mesh wear at the output pinion-to-ring interface (not internal gearbox wear)<\/td>\nReadjust the gearbox radial position to restore the correct pinion-to-ring backlash (0.08-0.20 mm). The ZR30 internal gears do not wear measurably at rated load within the 20,000-hour service interval; increased backlash is almost always at the external pinion-ring interface.<\/td>\n<\/tr>\n
Vibration increase without noise change<\/td>\nMounting bolt loosening, foundation settling, or developing bearing wear<\/td>\nRe-torque all mounting bolts to specification. If vibration persists, take an oil sample for particle analysis and schedule a bearing inspection at the next maintenance window.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

\n

\u95a2\u9023\u88fd\u54c1<\/h2>\n
\n
\"SE419T3<\/p>\n
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Track Drive Planetary Gearboxes \u2192<\/a><\/h3>\n

EP-SE heavy-duty track drives for 35-50 tonne excavator undercarriage propulsion and mining crawler equipment.<\/p>\n<\/div>\n<\/div>\n

\n
\n

\"EP-ZDF\u30b7\u30ea\u30fc\u30baHigh-Precision Planetary Gearboxes \u2192<\/a><\/h3>\n

BPG series for shipyard crane hoist fine-positioning, stacker boom luffing servo, and mining conveyor alignment systems.<\/p>\n<\/div>\n<\/div>\n

\"Industrial<\/p>\n
\n

Industrial Bevel Gearboxes \u2192<\/a><\/h3>\n

Right-angle bevel stages for shipyard auxiliary drives, mining conveyor tail drums, and stacker travel mechanisms.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n
\n
\n

When should I choose the ZR30 over the ZR45 flagship?<\/h3>\n

If your application requires more than 32,000 Nm continuous or more than 55,000 Nm peak, the ZR45 is necessary. If the torque requirement falls within the ZR30 envelope, the ZR30 offers 58 ratios (versus 3 for the ZR45), a lighter frame, shorter lead time, and lower cost. The ZR30 is also the better choice when precise ratio matching matters \u2014 the 58-option table almost always has a closer match to the calculated optimum than the ZR45 fixed three-point set.<\/p>\n<\/div>\n

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What is the weight of the ZR30?<\/h3>\n

Approximately 220-300 kg depending on stage count and brake option. The 5-stage with B615 brake is the heaviest variant. At this weight, mechanical lifting is required for installation \u2014 see the ZR19 page for detailed handling and lifting guidance that applies equally to the ZR30 frame.<\/p>\n<\/div>\n

\n

Can the ZR30 gears be inspected without removing the unit from the machine?<\/h3>\n

The output pinion teeth can be inspected visually through the pinion-ring mesh access area without removing the unit. The internal planetary gears can be inspected using a bore-scope through the inspection port on the housing. For detailed internal inspection (bearing condition, gear contact pattern analysis), the unit must be removed and partially disassembled at the factory or a qualified service facility.<\/p>\n<\/div>\n

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Is 20CrMnTi gear steel equivalent to the SAE 8620 used by European manufacturers?<\/h3>\n

20CrMnTi and SAE 8620 (EN 20MnCr5) are both carburising steels with similar case hardness after heat treatment (HRC 58-62). The primary metallurgical difference is the titanium content in 20CrMnTi, which provides grain refinement during carburising and slightly higher impact toughness at the case-core transition zone. In terms of gear performance at rated load, the two materials produce equivalent contact fatigue life and bending fatigue strength when processed to the same DIN quality class.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Customer Feedback<\/h2>\n
\n
\n
\n
V<\/div>\n
\n
Viktor S. \u2014 Mining Equipment Superintendent<\/div>\n
Verified Purchase \u00b7 Western Australia \u00b7 May 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Stacker-reclaimer slewing drive replacement at an iron ore operation. The previous unit was an old European brand that was no longer manufactured. Ever-Power matched the mounting dimensions from the old drawing and delivered a ZR30**5 at 867.63 ratio that bolted in without modification. Running 14 hours a day in red dust conditions. Oil analysis at the 3,000-hour mark showed lower particle counts than the old unit had at the same interval. Very satisfied with the metallurgy and build quality.<\/p>\n<\/div>\n

\n
\n
H<\/div>\n
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Hiroshi M. \u2014 Shipyard Production Manager<\/div>\n
Verified Purchase<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Goliath crane slewing, ZR30**3 at 64.30 ratio. The unit has been in service for 11 months on our 400-tonne hull-block transporter. Performance is stable and the thermal behaviour matches the factory prediction \u2014 sump temperature stabilises at 72 deg C under continuous duty, well within limits. The gear grinding quality is evident from the low noise level. Our quality inspector noted the material certificates are thorough and met our internal traceability requirements without additional requests.<\/p>\n<\/div>\n

\n
\n
B<\/div>\n
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Bruno T. \u2014 Heavy Equipment Mechanic<\/div>\n
Verified Purchase \u00b7 March 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Excavator slewing drive swap on a 42-tonne machine. The ZR30**2 performs well and the hydraulic BF02 interface is a clean fit. The unit weighs about 260 kg and getting it positioned in the upper structure of this particular machine required some creative rigging because the access hatch is tight. My suggestion to Ever-Power: provide a recommended rigging diagram for common excavator models in the installation manual. That would save a lot of time for mechanics who are installing this for the first time.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

The EP-ZR30 planetary gearbox is the second-largest frame in the Korea Ever-Power ZR slewing drive series, delivering up to 32,000 Nm continuous output torque and 55,000 Nm peak across 58 gear ratios spanning 2-stage through 5-stage planetary reductions (14.19 to 3,053). Bridging the gap between the ZR24 (21,000 Nm) and the flagship ZR45 (40,500 Nm), the ZR30 serves large hydraulic excavators in the 35-50 tonne class, shipyard gantry cranes, heavy mining conveyor drives, and large industrial turntable positioners. IP67 FKM sealed, DIN 5-6 ground, QT600-3 ductile iron housing, -40 to +80 deg C.<\/div>","protected":false},"featured_media":878,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[967],"product_tag":[],"class_list":["post-877","product","type-product","status-publish","has-post-thumbnail","product_cat-slewing-drive-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/product\/877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/comments?post=877"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/media\/878"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/media?parent=877"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/product_brand?post=877"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/product_cat?post=877"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ja\/wp-json\/wp\/v2\/product_tag?post=877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}