{"id":873,"date":"2026-06-17T06:11:53","date_gmt":"2026-06-17T06:11:53","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=873"},"modified":"2026-06-17T06:32:30","modified_gmt":"2026-06-17T06:32:30","slug":"zr16-slewing-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/fi\/tuote\/zr16-slewing-drive-planetary-gearbox\/","title":{"rendered":"ZR16 Slewing Drive Planetary Gearbox \u2014 Right-Angle Bevel-Planetary, 2-5 Stage"},"content":{"rendered":"
\n

<\/p>\n

\n

EP-ZR16 \u2014 61 Ratios, the Widest Selection in the ZR Series<\/h2>\n
\n
\n

\"Precision<\/p>\n

\n
\n
16,580<\/div>\n
Max Cont. Nm<\/div>\n<\/div>\n
\n
36,500<\/div>\n
Peak Nm<\/div>\n<\/div>\n
\n
61<\/div>\n
Ratio Options<\/div>\n<\/div>\n
\n
2-5<\/div>\n
Vaiheet<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n

The EP-ZR16<\/strong> is the most versatile frame in the ZR slewing drive series<\/a>. With 61 discrete gear ratios spanning five stage configurations (2-stage through 5-stage), the ZR16 provides the highest probability of an exact ratio match for any application in the 10,500-16,580 Nm torque class. Where other models force engineers to compromise between the closest available ratio and a larger motor, the ZR16 offers enough density of choice that the optimal motor-gearbox combination can almost always be achieved.<\/p>\n

At the lower ratios, continuous torque reaches 16,580 Nm \u2014 22% above the headline 13,580 Nm specification \u2014 because the shorter gear mesh path reduces cumulative losses. The 5-stage configurations extend the ratio range to 4,438:1 for ultra-low-speed positioning applications, with 26 options in this stage count alone providing fine-grained speed selection that no competitor in this torque class can match.<\/p>\n

IP67 Sealed<\/span>
\nDIN 5-6<\/span>
\n-40 to +80 deg C<\/span>
\n3,500 RPM Max<\/span>
\nPt 8.0-24.5 kW<\/span><\/div>\n<\/div>\n<\/div>\n<\/section>\n
\n

ZR16 Technical Parameters \u2014 61 Ratio Configurations Across 4 Stage Counts<\/h2>\n

Continuous torque at N2 x h = 100,000 hours. All configurations share 3,500 rpm maximum input speed. Torque de-rates in three tiers (16,580 \/ 13,000 \/ 10,500 Nm) as ratio increases within each stage count.<\/p>\n

2-Stage \u2014 ZR16**2 (3 Ratios)<\/h3>\n
\n\n\n\n\n\n\n\n
Suhde<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\nMax RPM<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
14.19<\/td>\n16,580<\/td>\n36,500<\/td>\n3,500<\/td>\n20.5 \/ 24.5<\/td>\n<\/tr>\n
18.22<\/td>\n13,000<\/td>\n28,600<\/td>\n3,500<\/td>\n20.5 \/ 24.5<\/td>\n<\/tr>\n
21.62<\/td>\n10,500<\/td>\n23,100<\/td>\n3,500<\/td>\n20.5 \/ 24.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

3-Stage \u2014 ZR16**3 (8 Ratios)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Suhde<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\nMax RPM<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
32.54<\/td>\n16,580<\/td>\n36,500<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
38.42<\/td>\n16,580<\/td>\n36,500<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
41.77<\/td>\n16,580<\/td>\n36,500<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
49.56<\/td>\n16,580<\/td>\n36,500<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
56.04<\/td>\n13,000<\/td>\n28,600<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
61.84<\/td>\n13,000<\/td>\n28,600<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
71.94<\/td>\n13,000<\/td>\n28,600<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n
85.36<\/td>\n10,500<\/td>\n23,100<\/td>\n3,500<\/td>\n11.5 \/ 13.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

4-Stage \u2014 ZR16**4 (24 Ratios)<\/h3>\n

Torque de-rates in three tiers: 16,580 Nm (i=113.24-286.00) \u2192 13,000 Nm (i=301.15-492.55) \u2192 10,500 Nm (i=529.11-744.52).<\/p>\n

\n\n\n\n\n\n\n\n
Ratio Range<\/th>\nCount<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
113.24 \u2013 286.00<\/td>\n12<\/td>\n16,580<\/td>\n36,500<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n
301.15 \u2013 492.55<\/td>\n8<\/td>\n13,000<\/td>\n28,600<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n
529.11 \u2013 744.52<\/td>\n4<\/td>\n10,500<\/td>\n23,100<\/td>\n9.5 \/ 12.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

5-Stage \u2014 ZR16**5 (26 Ratios)<\/h3>\n

Ultra-high reduction for creep-speed slewing. Torque tiers: 16,580 Nm (i=465.22-1,290.04) \u2192 13,000 Nm (i=916.79-2,394.94) \u2192 10,500 Nm (i=2,621.90-4,437.54).<\/p>\n

\n\n\n\n\n\n\n\n
Ratio Range<\/th>\nCount<\/th>\nCont. Torque (Nm)<\/th>\nMax. Torque (Nm)<\/th>\nPt F\/M (kW)<\/th>\n<\/tr>\n<\/thead>\n
465.22 \u2013 1,290.04<\/td>\n15<\/td>\n16,580<\/td>\n36,500<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n
916.79 \u2013 2,394.94<\/td>\n8<\/td>\n13,000<\/td>\n28,600<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n
2,621.90 \u2013 4,437.54<\/td>\n3<\/td>\n10,500<\/td>\n23,100<\/td>\n8.0 \/ 11.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Full per-ratio data sheets for the 4-stage (24 ratios) and 5-stage (26 ratios) configurations are available on request from Korea Ever-Power engineering<\/a>.<\/p>\n<\/section>\n

<\/p>\n

\n

Thermal Management \u2014 Preventing the Limiting Factor in Heavy-Duty Slewing<\/h2>\n

In the 13,000-16,580 Nm torque class, thermal power (Pt) is often the true sizing constraint rather than torque. A motor that delivers adequate torque at the output may generate more heat inside the gearbox than the housing can dissipate, leading to accelerated oil degradation, seal damage, and shortened bearing life. The ZR16 offers three progressively aggressive thermal management strategies.<\/p>\n

\n
\n
\u2600<\/span>
\nLevel 1 \u2014 Natural Convection (Standard)<\/strong><\/div>\n

The housing surface acts as the heat sink. Effective for intermittent duty (S3, ED under 40%) or continuous duty where motor input power stays below Pt(M). The finned housing design of the ZR16 provides approximately 15% more surface area than a smooth-walled housing of the same volume.<\/p>\n

Pt(M) range: 11.5-24.5 kW depending on stage count<\/div>\n<\/div>\n
\n
\ud83c\udf00<\/span>
\nLevel 2 \u2014 Fan-Cooled Shroud (Option)<\/strong><\/div>\n

An externally-mounted fan shroud attaches to the housing and forces air across the heat dissipation fins. Increases Pt by approximately 30-50% over natural convection. Suitable for continuous-duty applications (S1) where motor input power exceeds Pt(M) but stays below Pt(F). Powered by the motor shaft fan or a separate electric fan motor.<\/p>\n

Pt(F) range: 8.0-20.5 kW depending on stage count<\/div>\n<\/div>\n
\n
\ud83d\udca7<\/span>
\nLevel 3 \u2014 Oil Circulation Cooling (Special)<\/strong><\/div>\n

For applications where even fan cooling is insufficient (enclosed environments, tropical climate, 24\/7 S1 duty), an external oil circulation system pumps the gear oil through a heat exchanger and returns it at controlled temperature. This can double the effective Pt versus natural convection. Requires additional plumbing ports in the housing, which are factory-machined on request.<\/p>\n

Consult engineering for oil flow rate and cooler sizing<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Pinion-to-Slewing-Ring Interface \u2014 Getting the Mesh Right<\/h2>\n

The output pinion-to-slewing-ring mesh is the most critical interface in any slewing drive planetary gearbox installation. An improperly matched or aligned pinion mesh generates noise, accelerates tooth wear, and can cause premature failure of both the pinion and the ring gear. The ZR16 output pinion is manufactured to match the slewing ring tooth profile you specify.<\/p>\n

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\n
\n
\n

Tooth Profile Matching<\/strong><\/p>\n

Provide the slewing ring module (typically 6-14 for this torque class), pressure angle (usually 20 deg), and tooth count. We grind the output pinion to match the exact conjugate profile, ensuring full-face-width tooth contact under load. Mismatched module or pressure angle between pinion and ring gear is the most common cause of premature tooth failure in the field.<\/p>\n<\/div>\n

\n

Centre Distance and Backlash<\/strong><\/p>\n

The pinion-to-ring centre distance determines the operating backlash. Too tight creates binding and heat; too loose creates impact loading during direction reversals. Target backlash for this torque class is typically 0.08-0.20 mm at the pitch circle. The mounting arrangement must allow radial adjustment of the gearbox position to set and maintain this backlash as the ring gear wears over time.<\/p>\n<\/div>\n

\n

Face Width Alignment<\/strong><\/p>\n

The pinion face width must be fully engaged with the ring gear tooth face. Partial face-width contact concentrates the load on a portion of the tooth, creating localised stress that initiates pitting and spalling. Verify alignment by applying marking compound (Prussian blue) to the pinion teeth and rotating through a full ring gear revolution. The contact pattern should cover at least 80% of the face width.<\/p>\n<\/div>\n

\n

Slewing Ring Runout Tolerance<\/strong><\/p>\n

Slewing rings have inherent radial and axial runout from the manufacturing process. For ring gears with runout exceeding 0.3 mm at the pitch circle, the pinion backlash setting must account for the full runout range to prevent binding at the tight spots. Specify the ring manufacturer and model number at the time of enquiry and we will cross-reference the published runout tolerance.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n

\"Korea<\/p>\n

ISO 9001:2015 certified manufacturing with full material traceability<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Application Scenarios for the 10,500-16,580 Nm Class<\/h2>\n

\"Slewing<\/p>\n

\n
\n

Harbour Mobile Cranes (25-40 Tonne)<\/h3>\n

Rubber-tyred gantry (RTG) and harbour mobile cranes in the 25-40 tonne lifting class generate continuous slewing torques of 10,000-15,000 Nm at full jib extension. The ZR16 3-stage at ratios 38:1-56:1 provides the speed-torque balance for efficient cargo cycling, while 61 ratio options allow precise matching to the crane hydraulic system for minimum energy loss per cycle.<\/p>\n<\/div>\n

\n

Large Drilling Rigs \u2014 Rotary Table and Top Drive<\/h3>\n

Oil and gas drilling rigs, water well boring machines, and geotechnical drilling equipment require high torque at controlled low speeds for string rotation and mast positioning. The ZR16 4-stage and 5-stage configurations at ratios 200:1-1,300:1 deliver the creep-speed rotation these operations demand, with the IP67 sealing protecting against drilling mud, cuttings, and formation water present at every rig site.<\/p>\n<\/div>\n

\n

Steel Mill Ladle Cars and Transfer Turntables<\/h3>\n

Steelworks ladle transfer cars, caster turntables, and bloom handling positioners operate in extreme heat, scale dust, and intermittent water spray from cooling systems. The ZR16 5-stage at ultra-high ratios (2,000:1-4,438:1) provides the sub-1-rpm controlled rotation these heavy positioners require, while the QT600-3 ductile iron housing withstands the radiant heat and the right-angle configuration<\/a> keeps the motor clear of the thermal zone.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Related Products<\/h2>\n
\n
\n

\"SE419T3<\/p>\n

\n

Track Drive Planetary Gearboxes \u2192<\/a><\/h3>\n

EP-SE series for crawler propulsion on heavy excavators and drilling rigs that use the ZR16 for upper-structure or mast slewing.<\/p>\n<\/div>\n<\/div>\n

\n

\"EP-ZDF<\/p>\n

\n

High-Precision Planetary Gearboxes \u2192<\/a><\/h3>\n

EP-ZDF square-flange series for crane hoist precision positioning, drilling pipe handling automation, and steel mill transfer car servo drives.<\/p>\n<\/div>\n<\/div>\n

\n

\"Heavy<\/p>\n

\n

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

Right-angle bevel stages for crane auxiliary drives, steel mill conveyor systems, and port bulk material handling equipment.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Frequently Asked Questions<\/h2>\n
\n
\n

How do I choose between the ZR16 and the ZR10 for the same torque requirement?<\/h3>\n

The ZR10 (11,500 Nm rated, 41 ratios) and ZR16 (13,580 Nm rated, 61 ratios) overlap in the 10,500-11,500 Nm output torque range. If your required continuous torque falls in this overlap zone, the ZR10 is more compact and cost-effective. If the required ratio is only available in the ZR16 table (particularly 5-stage ratios above 465:1), or if you need the higher peak torque capacity (36,500 Nm versus 24,500 Nm), the ZR16 is the correct choice.<\/p>\n<\/div>\n

\n

Can the ZR16 operate in a steel mill environment with ambient temperatures above 60 deg C?<\/h3>\n

Yes, with modifications. Above 60 deg C ambient, the oil change interval must be halved (2,000 hours instead of 4,000), and the thermal power rating must be de-rated by 2% per degree above 40 deg C. For sustained ambient above 70 deg C, specify the high-temperature seal kit (FFKM seals rated to 200 deg C continuous) and ISO VG 460 PAO synthetic oil. External heat shielding is recommended if the housing is exposed to direct radiant heat from molten metal.<\/p>\n<\/div>\n

\n

With 61 ratio options, how do I narrow the selection?<\/h3>\n

Start with the target output speed: divide the motor speed by the desired output speed to get the target ratio. Filter the table for the closest match. Then verify: (1) the continuous torque at that ratio meets the application requirement with the appropriate service factor, (2) the thermal power at the corresponding stage count accommodates the motor input power, and (3) the stage count fits the physical installation envelope. If two ratios are equally close, choose the one with higher thermal capacity (fewer stages).<\/p>\n<\/div>\n

\n

What is the typical lead time for a ZR16 with a custom output pinion?<\/h3>\n

Standard lead time for the ZR16 with a custom-ground output pinion matched to your slewing ring tooth profile is 6-8 weeks from order confirmation. The pinion grinding adds approximately 1 week to the standard gearbox manufacturing cycle. If you provide the slewing ring drawing at the time of enquiry rather than after order, we can begin pinion engineering in parallel with the commercial process and reduce the overall timeline.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Customer Feedback<\/h2>\n
\n
\n
\n
G<\/div>\n
\n
Georg W. \u2014 Crane Design Manager<\/div>\n
Verified Purchase \u00b7 Hamburg, Germany \u00b7 March 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We specified ZR16**3 at 41.77 ratio for a new harbour mobile crane platform. The selection process was straightforward \u2014 with 61 ratios, we found an exact match for our hydraulic circuit rather than the usual compromise of rounding to the nearest available option. The calculated motor displacement matched the actual measured displacement within 2%, which meant the system ran at the predicted temperature from day one. Very unusual to get that level of agreement between calculation and field result.<\/p>\n<\/div>\n

\n
\n
A<\/div>\n
\n
Andrei V. \u2014 Maintenance Planner, Steel Division<\/div>\n
Verified Purchase<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Ladle car turntable in a melt shop, ZR16**5 at 1,087 ratio. The unit handles the 280 deg C ambient near the caster without issues when we installed the heat shield. The high-temperature seal option works. The 4-star rating is because the external oil circulation cooling that we needed for 24\/7 operation required a custom port machining that added 3 weeks to the lead time. If the cooling ports were a standard option it would have been 5 stars.<\/p>\n<\/div>\n

\n
\n
M<\/div>\n
\n
Mohammed R. \u2014 Project Engineer, Drilling<\/div>\n
Verified Purchase \u00b7 June 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Mast rotation drive on a large-diameter bored piling rig. Previously using a multi-stage chain reduction off a hydraulic motor which required constant re-tensioning. The ZR16 4-stage at 215.21 ratio replaced the entire chain drive assembly with one sealed unit. Chain tensioning maintenance went from weekly to zero. The rig downtime reduction alone justified the investment within the first two months of operation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

The EP-ZR16 offers the widest ratio coverage of any model in the ZR slewing drive series: 61 discrete gear ratios spanning 2-stage through 5-stage planetary reductions, from 14.19 to 4,438. Delivering up to 16,580 Nm continuous output torque and 36,500 Nm peak, the ZR16 serves harbour mobile cranes, large drilling rigs, steel mill ladle cars, and heavy industrial turntable positioners. The bevel-planetary architecture achieves 89-93% efficiency inside an IP67-sealed, DIN 5-6 precision ductile iron housing rated from -40 to +80 deg C. Manufactured by Korea Ever-Power to ISO 9001:2015.<\/div>","protected":false},"featured_media":874,"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-873","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\/fi\/wp-json\/wp\/v2\/product\/873","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/comments?post=873"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/media\/874"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/media?parent=873"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/product_brand?post=873"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/product_cat?post=873"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fi\/wp-json\/wp\/v2\/product_tag?post=873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}