Hitachi ZX330-3 / ZX330-5G Swing Drive Gearbox – Specification (9236591 / 9258610)

Description

Detail Information

Note: The application information provided is for reference only. Please confirm the part number and compare it with the old component before purchasing. If you have any questions, please feel free to contact us.
It is worth choosing a product that features stable performance, high reliability, easy installation, and quick response.

1. Key Features & Benefits

• Genuine Hitachi OEM-spec swing drive gearbox – OEM part numbers 9236591 and 9258610 (9258610 supersedes 9236591 with internal improvements). Engineered to Hitachi’s original equipment specifications for the ZX330-3, ZX330-5G, and compatible 30–35 ton class excavators. This is a brand‑new, factory‑spec unit – not remanufactured, not a generic substitute.

• Critical component for 360° upper structure rotation – The swing drive (also known as the swing reducer or swing gearbox) is the power transmission component that allows the excavator to rotate on its base. It multiplies torque from the swing motor to rotate the machine’s upper structure. When this gearbox fails, the machine cannot position itself for efficient digging.

• Direct replacement for Hitachi ZX330-3 and ZX330-5G series – Specifically designed for Hitachi ZX330-3, ZX330-3-HCMC, ZX330-5G, ZX330LC-5G, as well as ZX350-3, ZX350H-3, ZX350K-3, ZX350LC-3, ZX350LC-5B, ZX370-3, ZX400W-3, and other compatible models. Mounting flange, shaft interface, and bolt patterns match the original Hitachi specifications exactly – no modifications, no adapters.

• Multi‑stage planetary reduction design – The swing drive uses a precision multi-stage planetary gear train to achieve the high reduction ratio required for excavator swing applications. This compact planetary design delivers smooth, consistent torque transfer with minimal backlash.

• Enhanced durability with updated design – The 9258610 supersession represents the latest technical revision, offering improved bearing life over the original 9236591. Hitachi optimized the gear heat-treatment process in the Zaxis-3 generation to improve resistance against tooth pitting. This reducer ensures the excavator maintains its famous “Hitachi smoothness” during combined operations such as swinging while booming up.

• High torque output for 30–35 ton class work – The Hitachi ZX330-5G delivers a swing speed of 10.7 rpm and is powered by an Isuzu AA-6HK1X engine delivering 184 kW (246–250 HP). The machine has an operating weight of approximately 31.5–32.4 tonnes. The swing hydraulic circuit operates at 32.4 MPa, providing the rotational power and smooth control needed for precise slewing operations in the most demanding applications.

• Precision-forged output pinion – The output shaft is precision-forged to withstand the “shock loading” that occurs when stopping the swing on uneven terrain. This robust construction ensures long service life even under extreme conditions.

• Superior sealing system – Features high-performance floating seals to prevent gear oil leakage into the swing bearing tub. Premium seals prevent contamination ingress and oil leakage, extending service life.

• Factory-sealed and lubricated – The swing drive is sealed and filled with the correct lubricant at the factory. Premium seals prevent contamination ingress and oil leakage, ensuring reliable performance from day one.

• Pre-shipment visual verification – Before packing, we send you detailed high‑resolution photographs of the actual unit (mounting flange, splines, port threads, castings, overall condition). You approve shipment – we never ship blind.

• Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units, available for single‑piece or bulk orders.

2. Applications

The genuine Hitachi 9236591 / 9258610 swing drive gearbox is the power transmission component for the swing system on ZX330-3 and ZX330-5G series excavators used in the most demanding job sites:

• Large‑scale construction & infrastructure – Highway excavation, dam building, bridge footings, and large‑scale earthmoving projects. The swing drive’s smooth rotation and high torque output enable precise positioning of the upper structure for efficient loading and digging cycles. The “Hitachi smoothness” during combined operations (swinging while booming up) ensures operators can maintain productivity even in complex multi‑function workflows.

• Quarrying & aggregates – Loading trucks, stockpile management, and material handling in granite, limestone, and basalt quarries. The swing drive’s robust construction, precision-forged pinion, and superior sealing system withstand abrasive dust conditions, while the multi‑stage planetary reduction provides consistent torque for precise bucket control. The 32.4 MPa swing circuit pressure ensures reliable performance under heavy loads.

• Mining support – Site cleanup, road maintenance, drainage works, and equipment pad grading. A genuine new swing drive provides predictable service life – avoiding costly unplanned downtime in remote mine sites.

• Demolition & scrap processing – Shock loads, vibration, and sharp debris are routine in demolition yards and metal recycling facilities. The swing drive’s heavy‑duty construction, precision-forged output shaft, and improved bearing design absorb these extreme conditions without premature wear. The updated 9258610 design offers improved bearing life specifically suited for high-impact demolition applications.

• Equipment rental fleet – 30–35 ton excavators are high‑value rental assets. A genuine new swing drive eliminates the gamble of remanufactured or used units – avoiding costly mid‑rental failures, towing bills, and customer complaints. The swing drive is a high‑wear component on rental machines due to constant rotation and varying operator habits.

• Forestry & land clearing – Steep slopes, fallen timber, and uneven terrain demand reliable swing performance. The swing drive’s consistent torque delivery ensures smooth, controlled rotation even under varying load conditions.

3. FAQ – Frequently Asked Questions

Q1: Is this swing drive an exact replacement for my Hitachi ZX330-3 or ZX330-5G?

A: Yes. The 9236591 and 9258610 are genuine Hitachi swing drive gearboxes for ZX330-3, ZX330-3-HCMC, ZX330-5G, ZX330LC-5G, as well as ZX350-3, ZX350H-3, ZX350K-3, ZX350LC-3, ZX350LC-5B, ZX370-3, ZX400W-3, and other compatible models. To confirm compatibility for your specific machine variant, send us your machine serial number and a photo of the old drive nameplate – we will verify within 2 hours.

Q2: What is the difference between 9236591 and 9258610?

A: 9258610 is the official replacement part number for 9236591. Hitachi updated the part number to reflect internal component improvements, likely in the bearing or sun gear design, but they are dimensionally identical and fully interchangeable. The 9258610 represents the latest technical revision, offering improved bearing life over the original 9236591.

Q3: Does this assembly include the swing motor?

A: No. This part number refers specifically to the Swing Reducer (gearbox) . The hydraulic swing motor is a separate component that bolts onto the top of this unit. The swing motor converts hydraulic pressure into rotary motion, and the swing drive gearbox reduces speed and multiplies torque to rotate the upper structure.

Q4: What is the key specification of this swing drive?

A: The 9236591 / 9258610 swing drive is a multi-stage planetary reduction unit engineered for Hitachi’s 30–35 ton class excavators. The ZX330-5G delivers a swing speed of 10.7 rpm and a swing circuit pressure of 32.4 MPa. The machine has an operating weight of 31.5–32.4 tonnes and is powered by an Isuzu AA-6HK1X engine delivering 184 kW (246–250 HP). The 9258610 version features improved bearing life and optimized gear heat-treatment for enhanced durability.

Q5: What is the warranty on this swing drive?

A: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for genuine original parts. Our value is delivered up front: genuine Hitachi specification components, new‑condition drive, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote aftermarket alternatives – ask our sales team.

Q6: How long does delivery take?

A: Delivery is 5–8 working days after order confirmation from our Guangzhou warehouse. Express shipping (DHL/FedEx/UPS) is available for urgent orders.

Q7: What payment methods do you accept?

A: We accept L/C, T/T, XTransfer, PayPal, and Western Union.

Q8: How often should the gear oil be changed in this reducer?

A: For Hitachi 300-series excavators, Hitachi typically recommends checking the oil level every 250 hours and performing a full change every 1,000 hours. Using high-quality gear oil (API GL-4 or GL-5) is critical for planetary gear longevity.

Q9: How can I verify the drive is genuine before shipping?

A: Before packing, we send you clear, high‑resolution photographs of the actual unit – mounting flange, splines, port threads, casting marks, and overall condition. You approve shipment only after reviewing these images. We never ship blind.