Hitachi Hydraulic Pump Drive Gear 3104555 – Specification for ZX330-3 / ZX350 / ZX400 Series (37T × 15T, 2 per Machine)

Description

Product Video

Detail Information

1. Key Features & Benefits

• Genuine Hitachi OEM specification – Part number 3104555. Manufactured to Hitachi‘s original equipment standards for the ZX330-3, ZX330-5A, ZX350, ZX400W-3, and compatible Zaxis series excavators. This is a brand‑new, factory‑spec drive gear – not a generic aftermarket substitute. Each machine requires 2 units of this gear.

• Drive gear – the primary torque transmission component – The 3104555 gear is the main drive gear (also referred to as a gear drive or drive gear) within the hydraulic pump‘s gear train. It transmits rotation and torque from the engine-driven input shaft to the rest of the pump’s internal gearing. As a 37T × 15T configuration (37 teeth on one end, 15 teeth on the other), it provides the critical speed reduction and torque multiplication needed to drive the hydraulic pumping elements at the correct speed and pressure.

• Precision‑engineered gearing for high-load hydraulic pumps – Manufactured from high‑strength alloy steel with precision‑ground tooth profiles. The dual tooth count (37T/15T) ensures smooth meshing, minimal backlash, and efficient power transmission under the extreme hydraulic loads typical of 30–40 ton class excavators.

• Restores hydraulic pump performance – A worn or damaged drive gear causes irregular pump operation, reduced hydraulic flow, loss of digging power, increased noise from the pump area, and potential catastrophic pump failure. Replacing worn gears restores proper power transmission, consistent hydraulic output, and smooth machine operation. The HPV145 hydraulic pump used in these machines relies on precision gear alignment for optimal performance.

• Engineered for extreme durability – Built from case‑hardened steel with heat‑treated tooth surfaces to withstand the extreme torque loads, shock loads, and continuous operation typical of mining, quarrying, and heavy construction applications. Two gears per machine share the load, providing redundancy and extended service life.

• Wide compatibility across Hitachi Zaxis and John Deere models – Fits Hitachi ZX330-3, ZX330-3-HCMC, ZX330-5A, ZX350-3-AMS, ZX350H-3, ZX350K-3, ZX350LC-3-HCME, ZX400W-3, as well as EX270LC, EX280LC, EX300LC, EX330LC, EX350LC, and EX370LC series. Also compatible with John Deere excavator models including 330CLC, 350DLC, 370C, and 892E.

• Pre‑shipment visual verification – Before packing, we send you detailed high‑resolution photographs of the actual gear (tooth condition, part number markings, overall condition). You approve shipment – we never ship blind. Video inspection is also available upon request.

• Fast delivery – 5–7 working days lead time from our Guangzhou warehouse. Flexible shipping options including DHL, TNT, UPS, FedEx, and sea freight.

2. Applications

The Hitachi drive gear 3104555 is a critical internal component of the hydraulic pump gear train on 30–40 ton class excavators used across a wide range of demanding job sites:

• Large‑scale construction & earthmoving – Highway excavation, dam building, and large‑scale earthmoving projects place sustained high torque loads on the hydraulic pump gear train. The drive gear transmits engine power through the gear train to the hydraulic pumping elements. A worn gear results in reduced hydraulic flow, slower cycle times, and increased fuel consumption. Replacing worn drive gears restores full power transmission and hydraulic performance.

• Mining & quarry operations – In open‑pit mines and aggregate quarries, machines work 20+ hour shifts under extreme loads. The hydraulic pump gear train is subjected to continuous high torque and shock loads. A failed drive gear can cause sudden pump failure, resulting in lost production and expensive recovery efforts. Genuine OEM gears provide the durability and reliability needed for these demanding conditions.

• Demolition & scrap processing – Shock loads, vibration, and rapid load changes are routine in demolition yards and metal recycling facilities. The drive gear must withstand these extreme conditions without tooth pitting or fatigue failure. Genuine OEM heat‑treated gears provide the strength and durability required.

• Equipment rental fleet maintenance – Rental machines see heavy use from multiple operators, increasing the risk of component wear. Worn drive gears on a rental machine can cause poor hydraulic performance and customer complaints. Proactive replacement with genuine OEM gears ensures predictable performance and minimises downtime.

• Forestry & land clearing – Steep slopes, fallen timber, and uneven terrain place variable loads on the hydraulic system. The drive gear must transmit power reliably under changing load conditions. Genuine OEM gears maintain consistent power delivery for saws, grapples, and mulchers.

• Wheel excavator applications (ZX400W-3) – For wheeled excavators that travel on public roads between job sites, reliable hydraulic power transmission is essential for both road travel and worksite digging conditions. The drive gear ensures consistent hydraulic pump output across all operating modes.

3. FAQ – Frequently Asked Questions

Q1: What is the function of the 3104555 drive gear in the hydraulic pump?

A: The 3104555 is the main drive gear (gear drive) within the hydraulic pump‘s internal gear train. It transmits rotation and torque from the engine-driven input shaft to the rest of the pump’s gearing. With a 37T × 15T configuration, it provides the critical speed reduction needed to drive the hydraulic pumping elements at the correct speed and pressure. Each machine requires 2 units of this gear.

Q2: How do I know if my machine needs new drive gears?

A: Common symptoms include: whining, growling, or clicking noises from the hydraulic pump area; reduced hydraulic flow and slower cycle times; loss of digging power; irregular pump operation; or metal particles in the hydraulic oil. If you experience any of these issues, have your pump inspected by a technician – worn drive gears are often the cause.

Q3: Are the different part numbers (3104555, 3104554) interchangeable?

A: No. The 3104555 is the drive gear (37T × 15T), while the 3104554 is the center gear. They serve different functions within the pump‘s gear train and are not interchangeable. Always verify the correct part number for your specific application.

Q4: What is the weight of each gear?

A: Each gear weighs approximately 4.7 kg. Each machine requires 2 units.

Q5: What is the warranty on these gears?

A: The 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 components, new‑condition gears, 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 5–7 working days after order confirmation. Flexible shipping options including DHL, TNT, UPS, FedEx, and sea freight are available.

Q7: What payment methods do you accept?

A: We accept T/T (wire transfer), Western Union, and PayPal.

Still have questions? Contact Hongtengda Parts – we reply within 24 hours.