Komatsu PC200-7 Swing Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy

Komatsu PC200‑7 Swing Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy For Excavator Parts 22U‑26‑21580 22U‑26‑21540 22U‑26‑21530

Product Overview

This fully assembled second‑stage planetary carrier spider matched with sun gear serves as the core intermediate transmission assembly fitted inside Komatsu PC200‑7 swing reduction gearbox. Situated between first‑stage planetary input group and output flange, it completes secondary deceleration and torque amplification, delivering sufficient rotary torque to drive upper‑structure slewing during digging, loading, dumping and site leveling work. As one of the most widely‑used medium excavators, PC200‑7 often runs long‑hour continuous operations in mining yards, highway construction sites and municipal renovation projects. The 2nd‑stage planetary set bears heavy alternating torque and frequent forward‑reverse slewing impact load. Common failure manifestations include gear tooth surface spalling, sun gear spline wear, carrier pin‑hole oval deformation, fatigue crack generation and harsh metallic grinding noise while rotating. This aftermarket integrated assembly can directly replace defective original components, effectively solving typical gearbox failures such as insufficient swing power, rotational jitter and delayed slewing response. Cross‑reference OEM part numbers: 22U‑26‑21580, 22U‑26‑21540, 22U‑26‑21530. All mounting hole sizes, spline specifications and gear modulus are strictly manufactured according to original drawing standards, ensuring perfect fitting inside PC200‑7 swing gearbox without any structural modification required for installation.

Technical Specification

Product Highlights

1. Reliable integral forging construction: The planetary carrier spider adopts one‑piece forged alloy steel blank, greatly improving structural rigidity and impact resistance. It can withstand repeated alternating torque brought by frequent swing start‑stop under heavy‑duty working conditions, lowering failure risks such as pin‑hole elongation and carrier body fracture caused by long‑time impact load.
2. Advanced gear surface finishing process: The supporting sun gear goes through strict carburizing quenching treatment followed by precision grinding work. Fine‑processed tooth profile maintains stable and reasonable meshing clearance together with planetary gears and inner ring gear, reducing friction heat accumulation inside gearbox, suppressing abnormal knocking noise during slewing movement and extending overall service life of swing gear train.
3. Pre‑assembled integrated unit for rapid field overhaul: Supplied as complete finished assembly instead of separate loose gears and carrier parts. On‑site maintenance technicians do not need to spend extra time for gear matching and manual assembling work, significantly shortening gearbox repair cycle and minimizing equipment downtime loss for repair workshops, project contractors and machinery fleets.
4. Outstanding aftermarket interchangeability: Every critical dimension including mounting hole position, spline tooth profile and gear modulus complies strictly with OEM specifications. No cutting, grinding or secondary modification is needed in installation procedure. It turns out to be a highly cost‑effective inventory choice for global spare‑parts distributors, independent service centers and used‑excavator refurbishment projects.

Manufacturing & Quality Control

Our production plant owns complete manufacturing workflow covering forging processing, multi‑axis CNC machining, professional heat treatment and high‑accuracy gear grinding. Every incoming batch of alloy steel raw material will carry out strict inspection for chemical composition and mechanical performance to guarantee raw material quality. Key parameters such as carrier pin‑hole spacing, sun gear tooth profile and spline dimension are inspected piece‑by‑piece for all finished assemblies. Random sampling impact‑torque simulation tests are conducted to verify real‑world load‑bearing performance and gear meshing stability. Qualified products are wrapped with anti‑rust protective film, filled with shock‑absorbing padding and packed inside heavy‑duty wooden crates, effectively avoiding surface scratch, collision bruise and oxidation rust during long‑distance cross‑border sea and land transportation. Non‑conforming goods will be fully eliminated before packing and shipment.

FAQ

Q1: What fault symptoms indicate this second‑stage planetary assembly needs replacement? A: Obvious metallic grinding or clattering noise occurs during swing movement, swing torque drops significantly, intermittent rotation jitter, iron powder or metallic debris mixed in swing gear grease. Under these fault conditions, you need to disassemble gearbox housing and inspect the 2nd‑stage planetary components.

Q2: Can this assembly fit other Komatsu excavator models? A: This assembly is mainly engineered for Komatsu PC200‑7 and PC200‑8 swing gearbox. If you plan to apply it for other machine types, please double‑check your old part numbers and actual internal gearbox physical structure to prevent wrong purchase.

Q3: What key precautions should be taken during installation? A: Thoroughly clean gearbox inner cavity and fully remove residual metal debris left by worn‑out old parts. Fill qualified high‑temperature resistant swing gear grease after assembly completion. Perform low‑speed no‑load swing running‑in at first; never carry out heavy‑load digging and slewing operation immediately after finishing repair work.

Q4: What is included within product warranty scope? A: We provide standard aftermarket warranty covering manufacturing‑caused defects. Damage caused by hard foreign objects entering gearbox cavity, improper assembling operation and long‑term overload service is not covered by warranty. Please strictly follow official swing reducer daily maintenance specifications.

Q5: What are your delivery solutions? A: In‑stock items can be arranged for shipment within 3‑7 working days. We support sea freight, air freight and express courier services to satisfy diverse logistics requirements for bulk orders and urgent orders from international buyers.