3063957 Final Drive Planetary Gear 25T for HITACHI EX200-3 EX200-5 ZX200

3063957 Final Drive Planetary Gear

The 3063957 planetary gear is a replacement gear used inside the planetary reduction section of an excavator final drive and travel gearbox.

It rotates around the central sun gear while engaging with the surrounding ring gear, helping transfer rotational force through the reduction system and increase travel torque.

Accurate tooth geometry, correct gear engagement and stable support are important for smooth power transmission and reliable final drive operation.

Function in the Planetary Reduction System

The planetary gear operates as part of the rotating gear set inside the travel reduction gearbox. During excavator travel, the planet gears rotate around the central gear while transmitting torque through the carrier and reduction assembly.

Because the gear operates under repeated load and continuous tooth contact, wear on the gear teeth or internal bore can affect gear alignment and overall travel system performance.

The planetary gear should be inspected when symptoms such as the following are found:

• Abnormal grinding or knocking noise from the final drive

• Visible tooth wear, chipping or surface pitting

• Metal particles in the final drive oil

• Excessive backlash in the planetary gear system

• Abnormal wear inside the gear bore

• Weak or unstable travel performance

If abnormal gear wear or damage is found, the surrounding planetary reduction components should also be inspected before the gearbox is reassembled.

What to Check Before Replacement

Before installing a replacement planetary gear, inspect the original component for tooth wear, cracks, pitting and abnormal contact patterns.

The internal bore and gear support surfaces should also be checked for wear or deformation that could affect correct rotation and alignment.

The final drive oil should be inspected at the same time, especially if metal contamination or unusual mechanical noise was present before disassembly.

Ordering and Fitment Verification

To help confirm the correct planetary gear before ordering, please provide one or more of the following:

• Excavator brand and model

• Machine serial number

• Original part information

• Final drive or travel device information

• Clear photos of the original gear

• Outer diameter, bore size, overall width and tooth count when available

Comparing the original gear and confirming the travel device configuration before ordering helps reduce the risk of selecting an incorrect replacement.

Why Source Final Drive Gears from Topvelsun

Topvelsun supplies replacement excavator final drive, travel motor and planetary reduction components for major construction equipment applications.

We can assist with machine application verification and component matching to help customers select the correct replacement gear for final drive repair and maintenance.

Send us part number 3063957 together with your excavator information to request availability and quotation.