Doosan DH370 Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy For Excavator Parts

This first-stage planetary carrier and sun gear matched set serves as the primary deceleration core at the input end of travel motor final drive, custom-built exclusively for Doosan DH370 large heavy excavators. The DH370 model is widely deployed in large open-pit mines, highway earth excavation, river channel dredging and large-scale land leveling projects, enduring long-duration heavy-load digging, steep slope climbing and frequent rock impact abrasion.

The first planetary stage bears the maximum initial torque impact during machine startup and walking. Once spider support arms crack, sun gear tooth surfaces peel or internal splines suffer severe abrasion, the machine will display slow walking response, obvious left-right track speed difference, continuous sharp metal friction noise and rapid overheating of the entire travel motor housing.

We fully replie original Doosan factory drawing standards for gear tooth curves, inner spline sizes and mounting hole positioning. This assembly supports direct on-site replacement without secondary drilling, reaming or cutting, greatly shortening machine maintenance downtime. It effectively solves the points of long delivery cycles and high purchase prices of official Doosan original spare parts, ering to overseas second-hand equipment fleets distributed in Africa, Southeast Asia and Central Asia.

1. 1:1 OEM Precise Matching, Specialized for Doosan DH370 Travel Final Drive Internal Structure

   This planetary carrier and sun gear combination is strictly molded according to the internal cavity size of DH370 travel reducer, cannot be assembled on other Doosan models such as DH300 or DH420. Accurate reproduction of original spline and gear meshing gaps avoids track deflection, unstable jitter during walking, harsh internal grinding noise and premature wear of matching transmission accessories after installation.

2. Integrated Thickened Forged Body Greatly Extends Service Life Under Heavy Mining Working Conditions

   Most low-cost generic aftermarket planetary carriers are prone to spider arm fracture or sun gear tooth collapse under round-the-clock continuous heavy mining loads. Our one-piece thick die forging technology combined with complete multi-stage constant temperature heat treatment significantly improves the product’s impact resistance and fatigue resistance. It can maintain stable torque transmission during uninterrupted large-scale excavation and long-distance cross-region equipment transfer for leasing and second-hand heavy machine fleets.

3. Two Independent Pre-Delivery Quality Screening Mechanisms Block All Hidden On-Site Failure Risks

   Each finished assembly passes two completely independent closed-loop inspection processes before leaving the factory. Full-range dimension calibration accurately verifies all matching tolerances of gear surfaces and internal splines. Simulated large open-pit mine heavy torque aging test reproduces extreme harsh actual working loads to verify long-term transmission stability. All unqualified semi-finished products are eliminated internally, helping repair service shops and mine operators avoid economic losses caused by unplanned construction shutdowns.

4. High Cost-Effective Maintenance Solution for Large Excavator Fleet Owners and Local Maintenance Garages

   Genuine original Doosan planetary drive spare parts have extremely high procurement costs and unstable supply cycles for DH370 large excavators, a classic model widely circulated overseas. Our aftermarket assembly achieves load-bearing capacity and service life equivalent to OEM standards at factory direct wholesale prices, effectively reducing the annual maintenance budget of enterprises with multiple DH370 heavy machine assets.

5. Diversified Global Logistics Solutions for International Construction Machinery Spare Parts Wholesalers

   All spot inventory goods can be arranged for shipment within 3 working days after payment confirmation. Air freight channels meet urgent emergency repair orders from remote mountain mining areas. Consolidated bulk sea freight and full-container shipping provide cost-saving bulk procurement plans for dealers covering Africa, Southeast Asia, Middle East, Central Asia and Latin American markets.

Our production factory has more than 12 years of targeted R&D and mass production experience focusing on Korean brand excavator (Doosan, Hyundai) final drive planetary transmission components, with travel gearbox planetary carrier assemblies as our core flagship product series. We own a complete closed-loop production chain: alloy steel die forging, 5-axis precision gear processing, constant temperature professional heat treatment and finished product heavy-load simulation evaluation. Custom heavy torque test benches simulate harsh large mine and highway construction environments to continuously optimize product shock resistance and extend service life. Our planetary transmission spare parts are exported to more than 45 countries and regions worldwide, establishing long-term stable strategic cooperative relations with heavy machinery spare parts wholesalers globally.

1. Q1: Can this first-stage planetary carrier assembly be adapted to other Doosan excavator models besides DH370?

   A1: Cross-model compatibility is not supported. Different Doosan excavator series adopt final drive assemblies with exclusive non-interchangeable structural dimensions and spline parameters. Please double-check your exact machine model before placing orders.

2. Q2: What travel gearbox failures can this assembly repair?

   A2: It solves equipment faults caused by cracked carrier spider support arms, severely worn or chipped sun gear teeth, offset and wobbling tracks, continuous harsh internal gear friction noise and insufficient travel driving power output.

3. Q3: Are tiered volume discount policies available for large wholesale orders?

   A3: Yes, we offer graded preferential pricing linked to order quantity. We can coordinate full-container sea transportation to reduce overall international logistics costs for large-batch procurement.

4. Q4: What complete protective measures are adopted for long-distance ocean transportation?

   A4: All metal surfaces are evenly coated with high-viscosity heavy-duty anti-rust grease. The whole assembly is wrapped with multi-layer thick waterproof and shockproof PE film, then sealed and packed in reinforced export plywood crates, preventing surface scratches, collision deformation and damp corrosion during long overseas sea transportation.