Description
Product Video
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.
Detail Information
| Parameter | Value | Note |
|---|---|---|
| Condition | Brand New Original | – |
| Warranty | 3-6 months according to product details; We do not provide warranty for original and used products. | – |
| Minimum Order Quantity | 1 piece | – |
| Monthly Output | 300 pieces/month | – |
| Packaging Details | Wooden case packaging or customized | – |
| Payment Terms | L/C, T/T, XT, PayPal, Western Union | – |
| Delivery Time | 5-8 working days (depending on order situation) | – |
| Shipping Method | Sea freight, air freight or via DHL/FEDEX/TNT/EMS | – |
| Guarantee Measures | We inspect the product and send detailed pictures to buyer for confirmation. | – |
Japanese precision, ready when you need it. No remanufacturing, no unknowns — fresh factory‑spec power for your 50‑ton class excavator.
When a 50‑ton excavator loses its final drive, the machine doesn’t limp — it stops. Dead. That 47,700‑kg machine becomes a $500,000 paperweight stuck in the middle of a mine face or highway cut. You don’t need a rebuilt question mark. You don’t need a used unit with unknown hours. You need a genuine Japanese final drive, factory‑fresh, ready to bolt on. And you need it now.
1. Key Features & Benefits
Hitachi HMG88ER final drive – OEM part numbers 4699092, 9091681, 9263592, 9298565. Fully interchangeable variants, all factory‑spec. This is not a remanufactured unit with repaired parts; it is a new, genuine final drive travel motor assembly manufactured to Hitachi’s exacting standards for the ZAX490‑5A and compatible 50‑ton excavators.
Genuine Japanese OEM components – Built in Japan to Hitachi’s original manufacturing specifications using Japanese metallurgy and quality control. Every bearing, gear, seal, and casting meets the same standards as the unit that left the factory on your ZAX490‑5A.
Swashplate axial piston travel motor with planetary gear reduction – The HMG88ER integrates a high‑efficiency variable displacement axial piston hydraulic motor with a multi‑stage planetary gearbox. This design delivers the tractive force needed to move a 50‑ton machine up steep grades, through mud, across uneven terrain, and into tight loading positions — all while maintaining smooth, predictable travel control.
Designed for the Isuzu 6UZ1 engine platform – The 4699092 travel motor is engineered to work seamlessly with the ZAX490‑5A’s Isuzu 6UZ1 engine (maximum output 257 kW / 349 PS). The hydraulic circuit parameters — flow rate, pressure curve, and response characteristics — are matched to the machine’s main pumps (2 × variable axial piston pumps, maximum flow 2 × 400 L/min).
High operating pressure capability – The final drive operates at a rated pressure of 31.9 MPa (approx. 4,630 psi), matching the machine’s main relief setting. This ensures the travel motor can develop full tractive force when the operator demands it — no power loss, no hesitation.
Two‑speed travel with automatic shift logic – The HMG88ER fully supports the machine’s two‑speed travel system. The operator can select high speed (5.5 km/h) for moving across the job site or low speed (3.1 km/h) for high‑torque crawling during digging, climbing, or pushing. The hydraulic control logic automatically shifts between speed ranges based on load and pressure conditions.
Integrated spring‑applied, hydraulically‑released parking brake – A wet multi‑disc parking brake is built directly into the travel motor assembly. When the travel controls return to neutral, the brake engages automatically, holding the 47‑ton machine securely on slopes. When the operator moves the joystick, the brake releases instantly — no drift, no creep, no hesitation.
Durable planetary geartrain with surface‑hardened gears – The planetary reduction stage uses precision‑ground, case‑hardened alloy steel gears designed for high shock load resistance. The gearbox housing is cast high‑strength iron, dimensioned to withstand the full weight and impact forces of a 50‑ton excavator working in mining, quarrying, and heavy construction applications.
Premium floating seals – Genuine Japanese duo‑cone floating seals prevent cross‑contamination between the hydraulic motor section and the planetary gearbox. These seals keep abrasive dust, water, and debris out of the gearbox while preventing gear oil from leaking into the motor cavity. They are the single most important factor in final drive longevity.
Plug‑and‑play direct replacement – Mounting flange dimensions, bolt patterns, sprocket interface, and hydraulic port locations match the OEM specifications exactly. No drilling, no welding, no modifications. Your mechanic unbolts the old final drive and bolts this one in.
Comprehensive cross‑model compatibility – The 4699092 final drive directly fits the Hitachi ZAX490‑5A, ZX470‑5G, ZX470H‑5G, ZX470LC‑5B, ZX470LC‑5G, ZX470LCH‑5B, ZX470LCH‑5G, ZX470LCR‑5G, ZX470R‑5G, ZAXIS470‑5A, ZAXIS470LC‑5B, ZAXIS470LC‑5G, ZAXIS470LC‑6, and compatible ZX490‑5 variants. The engine fitments include Isuzu 6UZ1XKSA01D, 6UZ1XZSA‑01, 6WG1‑TQA‑5, and 6UZ1XASA010A.
Fast delivery – 5–8 working days lead time from our Guangzhou warehouse, with monthly supply capacity of 300 units.
2. What You Are Buying — And What You Are Not
You are receiving: A new, genuine Japanese final drive travel motor assembly. Factory‑fresh, never installed. No aftermarket substitutes, no remanufactured components, no second‑quality castings.
You are not receiving: A remanufactured unit with new paint over old parts. Not a used final drive salvaged from a scrapped machine with unknown hours. Not a “compatible” unit from a non‑Japanese supplier using uncertified components. You are buying the same quality that Hitachi put into your excavator when it was new — because we source directly from the same Japanese supply chain.
What this means in real terms: When you install this final drive, you are not gambling. You are not wondering how many hours the previous owner put on the unit, whether the bearings were replaced properly, or whether the floating seals will start leaking in three months. You are installing a component that matches the original in every measurable dimension — metallurgy, hardness, dimensional tolerance, seal compound, gear finish, bearing preload. It works like new because it is new.
3. Applications
The Hitachi ZAX490‑5A equipped with the HMG88ER final drive travel motor is a 50‑ton workhorse deployed across the most demanding industries in heavy construction and mining.
Mining & quarry operations – In open‑pit mines and aggregate quarries, 50‑ton excavators endure extreme shock loads, abrasive dust, long continuous shifts, and repeated high‑impact cycles. The final drive is the single most stressed undercarriage component. A failure in a remote pit can idle an entire production face. A genuine Japanese final drive delivers the reliability needed to keep production moving — and a replacement unit on the shelf turns a week‑long immobilization into a single‑shift repair.
Heavy construction & infrastructure – Highway cuts, dam foundations, bridge abutments, and large‑scale earthmoving projects demand consistent track mobility. A final drive failure in the middle of a highway cut stops production completely — the machine cannot move itself to a repair location, and towing a 50‑ton excavator requires specialized heavy recovery equipment. For fleet owners, a genuine final drive eliminates the guesswork of used components and provides predictable service life at a cost that justifies proactive replacement before failure.
Large‑scale excavation & site preparation – ZAX490‑5A machines are used in major earthmoving projects requiring sustained travel across rough terrain. The two‑speed travel system allows operators to move efficiently between work zones while retaining the low‑speed torque needed for climbing stockpiles and pushing through heavy material. The integrated parking brake holds the machine securely on steep slopes, even with a loaded 3.0 m³ bucket.
Equipment rental fleet maintenance – Rental fleets operating 50‑ton excavators see heavy use from multiple operators. Final drives are high‑wear components. A failure mid‑rental creates costly recovery logistics, lost revenue, and damaged customer relationships. A genuine final drive provides a predictable service life that makes proactive replacement a financially sound decision.
Aftermarket drivetrain rebuilds – When overhauling a ZAX490‑5A’s powertrain, installing a new final drive alongside the main pumps and travel motor ensures that the weakest link in the track drive is eliminated. This is standard practice for fleets that want to extend machine life beyond 20,000 service hours.
4. Why Choose Hongtengda Parts
At Hongtengda Parts, we have been supplying genuine and remanufactured undercarriage components for excavators since 2004. Headquartered in Guangzhou’s Zhucun parts hub — one of Asia’s major distribution centers for construction machinery — we combine deep inventory, cross‑brand knowledge, and reliable global shipping to keep your machines running.
25+ years of industry experience – Founded in 2004, we have sourced genuine Japanese final drives for Hitachi, Caterpillar, Komatsu, Kobelco, Hyundai, SANY, XCMG and more than fifteen other brands. We are not a middleman — we maintain direct sourcing relationships with Japanese supply chains.
New genuine stock, not reman – The HMG88ER final drive is a new, genuine Japanese component. No remanufactured units with unknown histories. No “rebuilt” cores with new paint. You receive a factory‑fresh final drive, ready to install. We can provide factory test reports upon request.
90% stock availability – Hitachi ZAX490‑5A final drive travel motor assemblies are in stock and ready for immediate dispatch from our Guangzhou warehouse. We are not a drop‑shipper — the unit you order is physically on our shelf, inspected, and ready to go.
24‑hour shipment – From our Guangzhou hub to your forwarder in 1 day. International orders are shipped within 24 hours via sea, air, or express courier (DHL, FedEx, UPS, TNT). Most customers receive their final drive within one week.
Pre‑shipment visual verification – We never ship a final drive blind. Before packing, we take clear, high‑resolution photographs of your actual unit, including the mounting flange, splines, port threads, casting markings, and general condition. You approve shipment — we do not ship without your confirmation.
Professional export packaging – Each final drive is packed in a heavy‑duty, fumigation‑free wooden case with internal foam padding and corner bracing. Your unit arrives undamaged whether shipped by air freight or in the lower deck of a container ship.
One‑stop sourcing – Beyond final drives, we supply complete undercarriage components (track chains, sprockets, track rollers, idlers, track shoes), hydraulic pumps (K5V series), swing motors, control valves, engine parts, and full rebuild kits for Hitachi EX and ZX series excavators.
Technical support before you buy – Not sure if this final drive fits your specific machine variant? Send us your machine serial number and a photo of the old final drive. Our workshop team will confirm compatibility, check bolt patterns, and verify port configurations within 2 hours.
After‑sales technical assistance – After you receive your final drive, our support continues. If you have questions about installation, torque specifications, case drain line routing, or brake testing, our engineers are available via email and messaging.
Send us your Hitachi ZAX490‑5A machine serial number and a photo of the old final drive — we will confirm compatibility, provide a firm quote, and document our pre‑shipment inspection for your approval within 24 hours.
Warranty note: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for genuine original or used parts. Our value is delivered up front: genuine Japanese sourcing, new‑condition components, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote aftermarket alternatives — please ask our sales team.
Critical installation tip for the ZAX490‑5A final drive:
The case drain line is the single most common installation point of failure. If the case drain line is blocked, kinked, or connected incorrectly, pressure will build inside the motor housing and blow the shaft seal instantly on first operation. Before starting the engine, verify that the case drain line is clear, unrestricted, and properly routed back to the tank.Ensure the planetary gearbox side is filled with the correct gear oil (SAE 90 or 80W‑90, API GL‑4 or GL‑5) to the level specified in your machine manual — typically about 5–6 litres. Some ZAX‑5A manuals specify 30W or 40W engine oil in the planetary gearbox; check your specific machine’s documentation. Do not overfill; excessive gear oil creates internal pressure that can force oil past the duo‑cone floating seals.
After installation, cycle the travel controls at low idle several times to bleed air from the brake release circuit. The machine may not move initially until the system is purged.
