Kobelco SK350-8 Swing Gearbox 1St Planetary Carrier Spider With 1st Sun Gear Assy For Excavator Parts LC32WO1017F1 LC32W01006P1 LC32WO1021P1

This first‑stage planetary carrier spider integrated with 1st sun gear assembly is a core transmission component installed inside the swing reduction gearbox of Kobelco SK350‑8 excavator. Located at the input end of slew reducer, it receives high‑speed power transmitted from swing motor and completes the first‑step deceleration and torque amplification for upper‑body rotation. Under harsh construction conditions of frequent starting‑stopping, heavy‑load rotation and shock impact, spline wear, gear tooth breakage and carrier deformation often take place. Once damaged, excavator will show symptoms including insufficient swing torque, stalling while slewing under load, unusual grinding noise and rotary jitter. This aftermarket assembly matches original drawing standards, supporting direct replacement to bring back stable swing performance for your machinery.

1. Reliable material & heat‑treatment process: Adopts premium alloy steel raw material. After strict carburizing and quenching treatment, gear tooth surface obtains high hardness while the carrier main body keeps proper toughness. It effectively resists impact load from frequent slewing, lowers risks of tooth cracking and carrier fracture in heavy‑duty working site.
2. High‑precision gear and spline machining: The sun gear teeth and inner‑outer splines are precisely ground. Smooth meshing condition reduces contact wear between matching gears. It avoids extra metal debris mixing into gearbox lubricant, so as to protect other planetary components from secondary abrasion damage.
3. Strict dimension inspection for each unit: Key parameters such as mounting hole spacing, spline size, tooth profile and assembly clearance are fully checked piece by piece. It ensures good assembling performance with original swing gearbox housing, helping mechanics finish onsite overhaul efficiently and shorten machine downtime.
4. Economical overhaul solution: Instead of purchasing the complete expensive swing reducer, replacing this first‑stage planetary carrier sun gear assembly can solve most slew power failure problems. It greatly controls maintenance cost for repair shops and end users.

We focus on manufacturing all series of excavator planetary gear components. Every production batch carries out raw material checking, hardness detection, gear meshing test before delivery. Finished parts are coated with anti‑rust oil and packed with shock‑proof packaging to avoid scratch and rust during long‑term sea freight. We support wholesale for excavator part dealers, maintenance factories and overseas clients, small trial order is acceptable.

Q1: How to judge whether this 1st planetary assembly needs to be replaced? A: When your excavator occurs swing weakness under load, obvious grinding sound inside swing gearbox, rotation stuck, or metal powder found in slew gear oil, you should disassemble and inspect the first‑stage planetary carrier and sun gear assembly.

Q2: Can this assembly fit other Kobelco excavator models? A: This unit is mainly developed for SK350‑8. Please verify your old part number LC32W01017F1 / LC32W01006P1 / LC32W01021P1 before placing order. Do not install on non‑matching models blindly.

Q3: What should pay attention to during installation work? A: Fully clean the inner cavity of swing gearbox and clear all metal wear residues. It is recommended to replace related bearings, seals and swing gear oil together after part installation. Conduct no‑load rotation test prior to heavy‑load operation.

Q4: About warranty scope? A: We offer guarantee for defects caused by manufacturing. Damage caused by improper installation, insufficient lubrication, overload operation is not covered by warranty. Please follow official excavator maintenance operation standard.