Komatsu PC60-7 Swing Gearbox 1St Planetary Carrier Spider With Sun Gear Assy For Excavator parts 201-26-71120 201-26-71160 201-26-71150

Komatsu PC60‑7 Swing Gearbox 1St Planetary Carrier Spider With Sun Gear Assy For Excavator parts 201‑26‑71120 201‑26‑71160 201‑26‑71150

Product Overview

This complete first‑stage planetary carrier spider and sun gear assembly serves as the primary torque reduction core unit fitted inside the swing reducer of Komatsu PC60‑7 compact crawler excavator. It takes torque input directly from swing motor output shaft, completes initial speed drop and torque boost, then transfers power to the secondary planetary group to drive upper house rotation. This small‑tonnage excavator is extensively used in urban narrow‑lot construction, basement digging, municipal pipeline laying, garden earthwork and small‑scale site clearance works. Under long‑term frequent forward‑reverse slewing impact loads, worn oil seals and deteriorated swing lubricant will let construction dust and metallic fine debris enter gearbox interior, causing spline abrasion, gear tooth surface pitting, carrier spider bending deformation and pin‑hole ovalization. Usual failure manifestations cover harsh metallic grinding noise inside swing gearbox, unstable jerky cab rotation, insufficient swing driving force, abnormal high temperature on reducer housing, as well as metal impurities observed during swing gear oil draining and replacement. Produced strictly referencing OEM forging drawings and gear engagement standards, this premium aftermarket spare part supports direct drop‑in fit, preventing successive damage to other costly internal gearbox components.

Technical Specification

Core Advantages

1. Forged alloy construction suitable for compact excavator primary‑stage heavy impact transmission The carrier spider and matched sun gear are hot forged from high‑quality alloy steel blanks. After carburizing quenching heat treatment, gear tooth faces and inner splines gain high surface hardness while retaining sufficient core toughness. The assembly can withstand cyclic shock torque generated from frequent combined digging and slewing actions, lowering failure risks such as tooth chipping, spline scratch and carrier distortion under muddy, dusty site operating circumstances.
2. Pre‑tested gear meshing tolerance guarantees reliable smooth slewing performance Each finished assembly carries out tooth profile inspection and backlash measurement before delivery. Tightly controlled meshing clearance reduces transmission vibration and friction‑induced grinding noise. When the compact excavator runs coordinated boom‑arm‑bucket plus swing compound movements, it maintains stable power output and avoids cab stutter or jerky rotation resulted from poor gear matching precision.
3. OEM‑matched mounting dimension lowers on‑site repair time cost Key dimensions including carrier outer contour, sun‑gear spline parameters, pin‑shaft hole layout and depth fully comply with original OEM specifications. Field service technicians can finish component replacement directly, without gearbox housing modification or manual adjustment for internal fitting gaps. For equipment rental enterprises and local repair garages, it shortens machine idle time and cuts economic losses brought by project pause caused by swing system breakdown.
4. Stress‑relief annealing eliminates internal residual stress from hot forging Stress‑relief annealing removes residual stress generated in hot forging procedure, improving long-term structural stability under repeated cyclic impact loads. Cooperated with high‑precision machining on pin shaft holes and bearing mounting seats, it slows premature wear of mating planetary gears and bearings, extending the whole service life of swing reduction assembly.
5. Cost‑effective partial overhaul choice for small excavator repair shops and equipment owners Instead of purchasing a complete expensive swing reducer unit, replacing only the worn first‑stage planetary carrier and sun‑gear assembly helps customers control maintenance costs. It is highly fit for machinery repair workshops, small construction contractors and global wholesalers focusing on Komatsu small‑excavator spare‑parts business.

Manufacturing & Quality Control

Our production workshop is specialized in planetary transmission spare parts for 5‑8 ton Komatsu compact excavator swing gearboxes. Full‑process quality management contains raw‑material composition verification, forging appearance check, heat‑treatment hardness test, gear‑tooth precision detection, spline dimension confirmation and sample no‑load running‑in inspection. Only fully qualified assemblies can enter packaging workflow. Finished goods are coated with anti‑rust preservation oil, wrapped with shock‑absorbing cushion materials and packed in export‑standard fumigated wooden cases, to guard against collision deformation and rust during long‑distance sea‑land combined transportation. We support bulk wholesale, stable batch supply; small trial orders are acceptable for global buyers.

Frequently Asked Questions

Q1: What abnormal phenomena indicate inspection or replacement of 1st planetary carrier and sun‑gear assembly? A: If your Komatsu PC60‑7 excavator produces loud metallic grinding sound inside swing gearbox, cab rotates jerkily and intermittently, swing power drops greatly, reducer housing gets overheated, or metal particles are found in waste swing gear oil during oil‑change maintenance, you should disassemble swing reducer for thorough internal inspection timely.

Q2: Will this assembly fit other excavator models? A: This spare part is purpose‑built for Komatsu PC60‑7 swing gearbox. Even if PC70‑7 has partial similarities on exterior appearance, internal gearbox configurations may differ. Please double‑check OEM part numbers 201‑26‑71120, 201‑26‑71160, 201‑26‑71150 before placing order to prevent installation mismatch.

Q3: What essential installation notes during gearbox overhaul? A: Fully clear all metal debris and old residual gear oil inside swing gearbox housing before installation. Meanwhile examine wear status of planetary gears, bearings and oil seals. After assembly completion, refill qualified swing gear oil, conduct low‑speed no‑load swing running‑in test before putting excavator into formal construction operation.

Q4: Warranty scope explanation A: Our warranty covers defects caused by raw‑material flaws and manufacturing errors. Damage caused by foreign‑object intrusion, insufficient gear‑oil lubrication, severe overload impact and improper disassembly‑installation will not be covered under warranty. Please strictly follow Komatsu official service manual when executing swing gearbox overhaul operations.