Grey Travel Motor Gearbox Doosan DX300-9 Gearbox Final Drive
Price:
Negotiable
MOQ:
1 Pc
Delivery Time:
7-35days
Product Description
Excavator Final Drive Travel Gearbox Reduction Gearbox Doosan DX300-9 Excavator Machinery Parts
Known as the swing gearbox in construction machinery fields, an excavator’s swing reducer is a vital transmission module that links the slewing motor to the large slewing gear ring. Its main roles are speed reduction and torque amplification, enabling the upper superstructure to rotate smoothly through 360 degrees without interruption.
Key Structural Components
Sun Gear: Coupled to the slewing motor’s splines to receive high‑speed power input.
Planet Gears: Each stage consists of 3 to 4 gears, orbiting and spinning around the sun gear to transfer torque.
Ring Gear: Rigidly fixed to the reducer housing and meshes with the planetary gear sets.
Planet Carrier: Outputs driving power to actuate the lower small drive gear.
Brake: Internal wet‑type multi‑disc brake, spring‑engaged for locking and hydraulically released, which avoids reverse rotation.
Housing and Bearings: Constructed from high‑strength cast or forged steel, fitted with heavy‑duty bearings for dustproof and leakproof performance.
Planet Gears: Each stage consists of 3 to 4 gears, orbiting and spinning around the sun gear to transfer torque.
Ring Gear: Rigidly fixed to the reducer housing and meshes with the planetary gear sets.
Planet Carrier: Outputs driving power to actuate the lower small drive gear.
Brake: Internal wet‑type multi‑disc brake, spring‑engaged for locking and hydraulically released, which avoids reverse rotation.
Housing and Bearings: Constructed from high‑strength cast or forged steel, fitted with heavy‑duty bearings for dustproof and leakproof performance.
High‑speed low‑torque power generated by the hydraulic motor is transferred via the sun gear, primary‑stage and secondary‑stage planetary assemblies to the output planet carrier. The pinion rotates at low speed with high torque, meshing with the inner gear ring of the slewing bearing to drive upper‑structure slewing.
Typical Operational Failures and Root Causes
- Unusual noise & unstable operation: Gear wear and surface pitting, bearing damage, insufficient or contaminated lubricating oil, improper gear meshing clearance.
- Oil seepage and leakage: Worn oil seals, housing cracks, overfilled lubricant, blocked breather vents.
- Sluggish or underpowered slewing: Worn gears and bearings, incomplete brake release, hydraulic motor internal bypass, mismatched reduction gear ratio.
- Excessive overheating: Low oil volume, deteriorated lubricant, overloaded operation, continuous brake drag, poor heat dissipation.
- Gear skipping and tooth fracture: Impact loads, foreign particle intrusion, fatigue‑induced wear, shaft misalignment during assembly.
| Machinery Test Report | Provided | Warranty | 3 Months |
| Video outgoing-inspection | Provided | Brand Name | OEM |
| Place of Origin | China | Part Name | Travel Reduction Assembly |
| Model | DX300-9 | Keyword | Excavator Machinery Part |
| MOQ | 1 Piece | Quality | Tested Great Performance |
| Application | Excavator | Delivery Time | 7-35 Days |
| Service | Professsional Service | Condition | Brand New |
Company Profile
Similar Products
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Lanzhou Fudong Guangqi Trading Co., Ltd
Location
No. 7 West South Binhe Road, Xigu District, Lanzhou City, Gansu Province, China
Contact Person
Liang