Komatsu PC200-7 Swing Gearbox 1St Planetary Carrier Spider With Sun Gear Assy For 22U-26-21570 22U-26-21520 22U-26-21510

Komatsu PC200‑7 Swing Gearbox 1St Planetary Carrier Spider With Sun Gear Assy For Excavator Parts 22U‑26‑21570 22U‑26‑21520 22U‑26‑21510

Product Overview

This pre‑built first‑stage planetary carrier spider paired with matched sun gear is the primary input transmission component installed inside Komatsu PC200‑7 swing reduction gearbox. Located right at the power input end connected with swing motor output shaft, it bears the peak instantaneous torque when slewing starts and stops, and initiates the first‑round speed reduction before power passes over to the secondary planetary set. Widely deployed in quarry exploitation, road construction and large‑scale earth‑moving projects, PC200‑7 excavators frequently undergo forward‑reverse swing cycles under heavy load conditions. The first‑stage planetary group tends to suffer from gear tooth chipping, sun‑gear spline stripping, carrier pin‑hole distortion, fatigue crack formation and harsh banging noise when swing starts. This aftermarket complete assembly serves as a direct replacement solution for worn‑out OEM components, effectively repairing swing lag, insufficient starting torque and rotational jerking faults. Cross‑reference OEM part numbers: 22U‑26‑21570, 22U‑26‑21520, 22U‑26‑21510. All spline sizes, mounting hole positions and gear parameters strictly comply with original drawing standards, ensuring seamless fitting inside PC200‑7 swing gearbox without any on‑site modification.

Technical Specification

Product Highlights

1. Heavy‑duty integral forging design: The planetary carrier spider adopts one‑piece hot forging blank. Since this input‑end assembly withstands the largest impact torque during swing startup, integral forging greatly enhances anti‑fatigue performance, resisting carrier cracking and pin‑hole oval deformation caused by frequent sudden start‑stop actions in tough working sites.
2. Precision machined mating sun gear: The sun gear is processed through carburizing quenching and fine grinding procedures. Optimized tooth profile guarantees consistent meshing clearance with planetary gears and internal ring gear. It reduces shock wear during frequent direction changes, lowers impact noise and extends the service life of the whole swing gear system.
3. Pre‑assembled module for rapid gearbox overhaul: Supplied as a complete assembled unit rather than scattered separate parts. Maintenance technicians save plenty of time on gear grouping and manual fitting work during gearbox repair, cutting machine downtime and lowering economic losses for repair shops and construction fleets.
4. Excellent aftermarket interchangeability: Every key dimension strictly matches OEM specifications. No cutting, grinding or secondary machining is needed during installation. It is a reliable stocking choice for global spare‑parts wholesalers, field service teams and used‑excavator refurbishment projects.

Manufacturing & Quality Control

Our production plant implements full‑process control covering forging, multi‑axis CNC machining, heat treatment and gear finish grinding. Every batch of alloy steel raw material will pass incoming inspection of chemical composition and mechanical property. Critical dimensions such as carrier pin‑hole spacing, sun‑gear tooth profile and spline parameters are inspected piece‑by‑piece for finished goods. Sampling impulse torque simulation tests are carried out to verify load‑bearing capacity and meshing stability under frequent impact conditions. Qualified assemblies are wrapped with anti‑rust film, filled with shock‑absorbing padding and packed in heavy‑duty wooden crates to avoid collision bruising and rust oxidation in long‑distance sea‑land cross‑border transportation. Non‑conforming products are fully eliminated before shipment.

FAQ

1. Q1: What failure signs mean this first‑stage planetary assembly needs replacement? A: Loud banging noise occurs the moment swing initiates, poor swing starting power, obvious rotational jitter, iron chips or metallic powder found inside swing gear grease. In these cases you need to disassemble gearbox housing and inspect first‑stage planetary components.
2. Q2: Can this assembly fit other Komatsu excavator models? A: This part is mainly engineered for Komatsu PC200‑7 and PC200‑8 swing gearbox. If you intend to apply it to other machine models, please compare your old part numbers and real gearbox internal structure carefully to prevent wrong order.
3. Q3: What installation points need special attention? A: Fully clean gearbox inner cavity and clear all residual metal debris left by damaged old parts. Fill qualified high‑temperature swing gear grease after assembly. Perform low‑speed no‑load swing run‑in first; do not run heavy‑load digging and slewing work right after repair completion.
4. Q4: What does the product warranty cover? A: We provide standard aftermarket warranty for manufacturing‑induced defects. Damage caused by hard foreign objects entering gearbox, improper assembly and long‑term overload operation is not within warranty scope. Please follow official swing reducer maintenance requirements.
5. Q5: What about delivery arrangement? A: In‑stock items can be dispatched within 3‑7 working days. We support sea freight, air freight and express delivery, meeting different logistics demands for bulk orders and urgent orders from worldwide buyers.