A standard excavator that swings or travels slowly, whines under load or leaks oil from the travel reduction hub is usually telling you the DX500 DX520 Travel Gearbox has reached the end of its service life. Worn planet gears, a scored ring gear and a failed bearing set all waste torque before it reaches the track or the upper structure. RITO supplies this DX500 DX520 Travel Gearbox as a ready-to-fit assembly, so the machine is back to full tractive effort and travel speed without a rebuild.
Item NO.:
DX500 DX520Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In StockDX500 DX520 Travel Gearbox is a complete reduction assembly for the travel circuit of standard excavators. The housing carries the ring gear and bearing bores in one rigid casting, the planet carriers run on caged bearings, and the output shaft is splined to match the original interface, so the unit drops into the existing mounting pattern without modification. Every assembly is checked for backlash, turning torque and seal integrity before it leaves the line.
| Part Number | DX500 DX520 |
| Part Name | Travel Gearbox |
| Compatible Brand | Doosan |
| Applicable Models | DX500 DX520 |
| Application | Excavator travel gearbox in the final drive circuit |
| Material | Cast iron housing with hardened alloy steel gear set |
| Product Color | Industrial grey / OEM color |
| Working Temperature | -25°C~+80°C |
| Key Function | Delivers final drive torque to the track sprocket |
| Condition | 100% New |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
 | Double-Lip Sealing A double-lip output seal plus O-ring joints keep abrasive dust out of the oil, the main reason reduction units fail early on demolition and quarry work. |
 | Bolt-On Fitment Mounting pattern, output spline and overall envelope follow the original unit, so the assembly installs with the existing bolts, hoses and guards. |
 | Hardened Internals Gears and shafts are case hardened and ground, giving a tooth surface that resists pitting under the shock loads typical of excavator travel and swing duty. |
 | Rigid Cast Housing The ring gear and bearing bores sit in one casting, holding bore alignment under load so the gear mesh does not walk out of position. |
Q: What usually causes these reduction units to fail?
A: Contaminated oil and lost bearing preload. Once dust enters through a worn seal, the bearings loosen, the gear mesh misaligns and the unit starts to whine and overheat within a few hundred hours.
Q: Do I need to adjust backlash after fitting?
A: No. Backlash and bearing preload are set at assembly. Fit the unit, fill with the specified oil grade, and check for leaks after the first few hours of operation.
Q: Is this a complete assembly or just the gear set?
A: It is supplied as a complete reduction assembly - housing, ring gear, planet gears, carriers, bearings, seals and output shaft - so nothing has to be transferred from the old unit.
Q: How do I confirm this DX500 DX520 unit fits my machine?
A: Compare the mounting bolt pattern, the output spline and the overall height against the unit on your machine, and check the model plate. If the numbers differ, send us a photo of the plate and we will confirm the correct variant.
Q: Which oil should I use after installation?
A: Use the grade listed in the machine service manual for the final drive or swing reduction. Overfilling causes heat; underfilling causes immediate bearing damage, so fill to the level plug.
Q: Can this unit be used as an upgrade on an older machine?
A: Where the mounting pattern and spline match, the later specification can be fitted to earlier machines. Confirm the interface dimensions with us before ordering.
Q: Why Choose RITO?
A: Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
This RITO 420-00342B Hydraulic Pilot Control Valve (LH) is a key control component for Hitachi EX200, ZX200, and ZX210 excavators, designed to transmit precise pilot pressure signals from the joystick to the main control valve. It ensures smooth operation, accurate response, and stable control of the arm, bucket, and travel functions in construction environments.
View More
This RITO 420-00343B Hydraulic Pilot Control Valve (RH) is a key control component for Hitachi EX200, ZX200, and ZX210 excavators, designed to transmit precise pilot pressure signals from the right-hand joystick to the main control valve. It ensures smooth operation, accurate response, and stable control of the arm, bucket, and travel functions in construction environments.
View More
The RITO Swing Reduction Sun Gear No.2 130425-00010 is an essential component designed for excavators, particularly in the swing reduction system. This high-performance sun gear plays a critical role in ensuring the smooth operation of the excavator's swing mechanism, providing efficient power distribution to the swing motor. Ideal for wholesale distributors, dealers, and mining companies, the 130425-00010 guarantees long-lasting durability and reliable performance under heavy-duty conditions. With its robust design, it minimizes downtime and maintenance costs, ultimately increasing the productivity of the machinery. Whether for routine replacements or high-performance upgrades, this swing reduction gear sun gear ensures excellent operational efficiency in challenging environments.
View More
The RITO Excavator Swing Carrier Assy 1st Sun Gear 100502-00039 is a crucial component designed for excavator swing systems, offering high efficiency and durability in heavy-duty operations. This planet carrier assembly plays a key role in the swing reduction system, ensuring smooth torque distribution and precise control of the excavator's swing motion. Whether for routine maintenance or heavy-duty replacement, the 100502-00039 provides a cost-effective solution for maintaining excavator functionality. Wholesale distributors, dealers, and mining companies can rely on this robust assembly to keep their machinery running smoothly, reducing downtime and enhancing productivity in demanding industrial applications.
View More
The RITO Swing Reduction 1st Planet Gear Assy 100502-00037 is an essential component for excavator swing reduction systems, designed to enhance the performance of the final drive system. This 1st planet gear assembly and swing 2nd carrier assembly work together to efficiently transfer torque, ensuring smooth and reliable swing operations under demanding conditions. The 100502-00037 is crucial for minimizing downtime and improving the overall operational efficiency of heavy machinery, making it an ideal solution for wholesalers, dealers, and mining companies. It is built to withstand high torque and pressure, offering superior durability and performance even in harsh working environments.
View More
Targeting wholesalers, agents and mining operators, this 2404-1065 14-tooth swing pinion gear is a critical drive part for Doosan Solar 340LCV excavators. It solves B2B pain points like short service life, poor matching and frequent breakdowns. Superior to ordinary gears, it delivers high hardness, wear resistance and precise transmission to cut mining operation downtime and maintenance costs.
View More
Mine/construction fleets face costly downtime from worn cylinder pins; generic parts fail fast, delaying projects and inflating costs for wholesalers/agents. Attention: RITO Cylinder Head Pin 120501-01081 fits Doosan DX300LC boom/arm cylinders. Solution: Precision-machined, high-grade steel reduces wear; OEM/OEM/aftermarket options stabilize supply, cut downtime and inventory risks.
View More
130422-00095A / 130425-00010 / 100502-00039 solve downtime nightmares: mining & contractor fleets see 40% longer swing drive life vs low-grade alloys. Precision forged teeth reduce shock load failures, cut unplanned service calls. Stock ready for urgent rebuilds.
View MoreLeave A Message
Scan to wechat :
