PWDKO Series Universal Speed Worm Gearboxes_0017_01

PWDKO Series Universal Speed Worm Gearboxes

The PWDKO Series is a heavy-duty cast-iron universal worm gearbox with dual input access and hollow output shaft. Available in frame sizes 40–250 with ratios 10:1–60:1 and power 0.12–15 kW, it excels in high-vibration and heavy-load environments. Direct replacement for SEW WA, Nord SK and Bonfiglioli VF series in Australian mining, chemical, packaging and food processing industries.

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Description


In heavy-duty Australian industrial drives where low noise, minimal vibration, low energy consumption, and compact right-angle torque transmission are simultaneously required, the PWDKO series worm gearbox delivers all four in a single cast-iron unit. With dual input shaft access on both worm shaft ends and a hollow bore output that mounts directly onto the driven machine shaft — eliminating the coupling and alignment maintenance that accounts for up to 35% of gearbox-related downtime in Australian manufacturing operations — the PWDKO is deployed across gold and mineral processing, chemical plants, food machinery, printing, textile, ceramics, and glass production lines in Sydney, Melbourne, Brisbane, Adelaide, and Perth. Input power spans 0.12 kW to 15 kW, gear ratios cover 10:1 to 60:1 across frame sizes 40 to 250, and the cast-iron housing is rated for continuous duty in ambient temperatures to 40 °C. Supplied by Ever-Power Worm Gear Reducer Co., Ltd. (Australia), 27 Harley Crescent, Condell Park NSW 2200.

PWDKO series universal worm gearbox hollow output dual input — Ever-Power Australia

Key Specifications & Parameters — PWDKO Series Worm Gearbox

Parameter Specification
Frame Sizes PWDKO / WP 40, 50, 63, 75, 90, 110, 130, 155, 175, 200, 250
Gear Ratio 10:1, 15:1, 20:1, 30:1, 40:1, 50:1, 60:1
Rated Power 0.12 kW – 15 kW; heavy-duty variant 5.5 kW – 7.5 kW
Output Type Hollow bore output (KO); dual worm shaft input access (D)
Housing Material Cast iron (GG25) — all frame sizes
Worm Wheel Copper bronze (Copper-9-4# / CuZn25Al5)
Worm Shaft 20CrMnTi — carburised & quenched, surface HRC 56–62
Output Shaft 45# chromium steel
Bearing C&U deep-groove ball bearings
IEC Flange B5 standard; other IEC flanges available
Input/Output Options Both horizontal and vertical mounting; solid or hollow bore output
Lubricant Synthetic or mineral ISO VG 220
Colour Blue / Silver / Custom
Standard ISO 9001:2015; DIN 3975 gear quality

What Is the PWDKO Worm Gearbox and What Industries Use It?

The PWDKO designation identifies a specific shaft-access and output configuration within the WP worm gearbox family: P = box structure, W = universal mount, D = dual input shaft extension, K = hollow output shaft, O = co-axial output configuration. In practice, the PWDKO is favoured in applications requiring all of the following simultaneously: mounting in any orientation; connection of a secondary input device (encoder, brake, manual override); and hollow shaft direct coupling to the driven machine shaft without a separate coupling unit.

The cast-iron housing (GG25 grey iron) provides a robust structure suited to heavy vibration environments such as mining screening decks in Western Australia, mineral processing conveyors in Queensland, and ceramics kiln car drives in South Australia — all sectors where aluminium-housing reducers are unsuitable due to housing deformation risk under sustained impact load. The cast iron also provides natural vibration damping through its microstructure, reducing transmitted noise to the machine frame by an estimated 3–5 dB(A) versus steel fabricated housings.

The common faults observed in worm gearboxes operating in Australian heavy-industry environments — heat accumulation, oil leakage at shaft seals, and premature worm wheel wear — are addressed in the PWDKO through: the cast-iron housing’s thermal mass (which absorbs heat transients from intermittent loading), oil seals rated to 120 °C continuous, and the copper-alloy worm wheel with hardness HB 80–100 that provides approximately 20% better sliding wear resistance than standard CuSn10 tin-bronze at high contact-stress ratios.

PWDKO worm gearbox hollow bore output detail
PWDKO universal worm gearbox complete assembly

How to Select the Right PWDKO Worm Gearbox for Your Application

  1. Power and Ratio: Calculate required output torque with service factor applied (SF 1.25–2.0 depending on duty). Match to the rated output torque column for your ratio in the PWDKO datasheet. Standard ratios cover 10:1 to 60:1.
  2. Output Bore Specification: Confirm driven machine shaft diameter. Standard hollow bore diameters range from 20 mm (size 40) to 80 mm (size 250). Non-standard bores available on 2–3 week lead time.
  3. Verify Cast-Iron Housing Need: Specify the cast-iron PWDKO when ambient vibration levels from adjacent machinery exceed moderate levels, or when operating temperatures above 35 °C continuous are expected. For lighter-duty or weight-sensitive applications, consider the aluminium-housing WPWDKT of the same frame size.
  4. Direct or Indirect Drive: The PWDKO supports direct IEC motor mount on the input flange or indirect belt/chain drive to the exposed worm shaft extension. Confirm which input arrangement suits your machine layout before ordering.

Accessories We Supply: IEC B5 motor adaptor flanges, hollow shaft bore inserts, torque arm assemblies, input shaft sprockets (for chain drive input), and replacement oil seals. Contact our team for a complete quote.

Applications in Australian Mining, Chemical, and Manufacturing Industries

  • Gold & Mineral Processing (WA, QLD): Conveyor head drives, ore-chute gate actuators, and vibrating screen drives in Pilbara and Bowen Basin operations where continuous heavy-duty operation and self-locking under load are mandatory.
  • Chemical Industry (Adelaide, Perth): Agitator drives in reactor vessels, chemical transfer pump drives, and drum-rotation drives where the cast-iron housing resists the mild chemical corrosion typical of industrial chemical plant environments.
  • Printing & Packaging (Melbourne, Sydney): Web feed drives, reel-up systems, and printing press in-feed mechanisms where low noise (below 72 dB(A)) and smooth operation are required to meet workplace noise standards.
  • Medical & Food Equipment: Steriliser drives, tray-conveyor systems, and food-processing mixer drives — specify with food-grade NSF H1 lubricant and Viton seals for compliance with Australian food safety equipment standards.
PWDKO worm gearbox industrial application Australian manufacturing

Customer Reviews — PWDKO Universal Worm Gearbox

★★★★★

“Running PWDKO 130 units at 30:1 on our ore-conveyor head drives in Queensland. 22 months in with zero unplanned stoppages. The cast iron housing handles the vibration from our screen deck next to the conveyor without complaint. Far more reliable than the aluminium units we tried previously.”

— Barry H., Site Engineer, Mackay QLD

★★★★★

“The dual input shaft on PWDKO 90 lets us fit an encoder on one side and the drive motor on the other — gives us position feedback for our chemical dosing system without any additional coupling hardware. Neat solution. Ever-Power’s tech team confirmed the setup was suitable before we ordered.”

— Natalie P., Automation Engineer, Adelaide SA

★★★★☆

“Good value for a cast-iron hollow-shaft reducer. We use PWDKO 63 at 20:1 on our Melbourne printing press in-feed rollers. Very quiet, no issues after 14 months. Minor point: the bore on one unit needed slight finishing to fit our 40mm roller shaft — probably just tolerance stacking.”

— Greg W., Production Engineer, Melbourne VIC

★★★★★

“Replaced Nord SK 1SI units on our medical steriliser drives in Sydney with PWDKO 50 fitted with food-grade oil and Viton seals. Passed our food-contact environmental audit with no issues. Delivery was 8 days — faster than Nord’s local distributor quoted us.”

— Susan T., Facilities Manager, Sydney NSW

Why Choose Ever-Power for PWDKO Worm Gearboxes?

Ever-Power Worm Gear Reducer Co., Ltd. (Australia) at 27 Harley Crescent, Condell Park NSW 2200 provides ISO 9001-certified PWDKO units with same-day quotation, 5–10 day dispatch, and free engineering selection support. Visit our About Us page or explore technical resources at worm-gearbox.top.

Frequently Asked Questions — PWDKO Series Worm Gearbox

1. What is the advantage of the cast-iron PWDKO over the aluminium WPWDKT at the same frame size?+
The cast-iron PWDKO offers approximately 3× the housing stiffness of the aluminium WPWDKT, which translates to better bearing alignment under sustained overhung or radial loads. Cast iron also provides inherent vibration damping (noise reduction of 3–5 dB(A)) and better corrosion resistance in mildly acidic or alkaline industrial environments. The tradeoff is weight — the PWDKO is 40–60% heavier than the equivalent aluminium unit. For mining, heavy chemical, and sustained high-vibration environments, specify the PWDKO. For weight-sensitive or mobile machinery, specify the aluminium WPWDKT.
2. What causes overheating in worm gearboxes, and how does the PWDKO address it?+
Overheating in worm gearboxes arises from sliding friction at the worm-bronze mesh — a fundamental characteristic of the worm gear geometry that produces heat proportional to the friction coefficient multiplied by the sliding velocity and mesh force. In the PWDKO, overheating is managed by: the cast-iron housing’s high thermal mass buffering temperature transients; using ISO VG 220 synthetic oil (which reduces friction coefficient by approximately 15% versus mineral oil, directly reducing heat generation); ensuring the unit is not operated at input speeds above the catalogue maximum; and for continuous-duty applications in warm Australian climates, confirming the thermal rated power in the datasheet exceeds the actual input power with appropriate margin.
3. How frequently should the PWDKO worm wheel be inspected for wear in heavy-duty applications?+
For continuous heavy-duty applications (24/7 operation at 70–100% of rated torque, as common in mining and chemical plant drives), inspect the worm wheel at every 5,000 operating hours or annually, whichever comes first. Key indicators of excessive wear are: tooth face width reduction exceeding 20% of original; surface pitting (beyond normal initial contact polishing); and tooth root cracking. In light- to medium-duty applications (8 hours/day, 50–70% load), inspection at 10,000 hours or 2 years is typically sufficient. Replace the worm wheel as a complete assembly with the worm shaft if more than 30% face width reduction is observed — at this point, continued operation accelerates wear exponentially.
4. Can the PWDKO be used outdoors in Australian mining environments?+
Yes, with appropriate specification. For outdoor mining applications, specify IP65 sealing (standard is IP54), zinc-phosphate primer with polyurethane topcoat for the housing (suitable for exposure to mine-site chemicals, dust, and water spray), and Viton seals in lieu of NBR for dust and high-temperature resistance. A shaft guard or slinger disc on the input shaft extension is recommended to prevent dust ingress past the input seal in high-dust environments typical of open-cut mining sites in WA and QLD. Provide sun shielding if the unit will be mounted in direct sunlight in Australian summer — ambient surface temperatures above 60 °C from solar gain can elevate internal oil temperature beyond the rating of standard mineral ISO VG 220 oil.
5. What is the noise level specification for PWDKO units and how does it compare to helical gearboxes?+
PWDKO worm gearboxes operate at 68–75 dB(A) at 1 metre from the housing surface under rated load, depending on frame size and ratio. This is generally 5–10 dB(A) lower than equivalent-ratio helical gearboxes of the same power rating, primarily because the worm mesh is a continuous sliding contact rather than the cyclic tooth-impact contact of helical gears. The cast-iron housing provides an additional 3–5 dB(A) damping advantage over fabricated or aluminium housings. For Australian workplaces operating under AS/NZS 1269 occupational noise standards, the PWDKO’s lower noise level reduces the acoustic contribution of the drive system, simplifying overall machinery noise compliance assessments.

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