Komatsu Part PLANETARY GEAR 421-22-12583

—

Product Overview

The 421-22-12583 PLANETARY GEAR is a genuine Komatsu OEM replacement planetary gear from the 421 prefix series. Planetary gears are the torque-distributing elements in final drives, swing drives, and planetary transmissions — each planet meshes with both the sun gear and ring gear, sharing the transmitted load across multiple tooth contacts.

Part Number: 421-22-12583 Part Name: PLANETARY GEAR Part Type: OEM Komatsu Replacement Gear Availability: In stock

—

When to Replace

• Pitting, spalling, or chipping on tooth flanks visible during inspection
• Howling or clicking noise from the drive during operation
• Metal particles found in oil samples or during oil changes
• Excessive backlash measured between sun, planet, and ring gears
• Broken or chipped teeth — replace immediately to prevent contamination of the entire assembly

—

Installation

1. Confirm 421-22-12583 in your Komatsu catalog
2. Inspect mating sun and ring gears — replace together if multiple components show wear
3. Clean the planetary assembly — flush out old oil and metal debris
4. Install planet gear on its bearing or needle rollers
5. Verify free rotation and check backlash against specification
6. Fill with fresh lubricant to correct level

—

Request a Quote

Need the Komatsu 421-22-12583 PLANETARY GEAR? Contact us through the form or by phone, email, or WhatsApp. We respond within one business day.