Kobelco SK350‑8 Swing Gearbox 2nd Planetary Carrier Spider With 2nd Sun Gear

This 2nd planetary carrier spider together with 2nd sun gear assembly serves as the core transmission component inside swing gearbox for Kobelco SK350‑8 excavator. It undertakes torque distribution and speed reduction during upper‑structure slewing movement, converting high‑speed low‑torque input from swing motor into powerful low‑speed torque output. Severe working conditions including frequent rotation, impact load and abrasive metal debris will easily lead to gear tooth chipping, carrier deformation and abnormal noise. Replacing this assembly can effectively fix typical breakdowns such as slow swing, jerky rotation and loud knocking sound from slew reducer. Our aftermarket assembly is strictly manufactured against original part drawing standards for direct drop‑in replacement.

1. Strict raw material selection: Adopts high‑grade alloy steel material, whole assembly goes through carburizing and quenching heat treatment. Improved surface hardness brings outstanding anti‑wear performance, resisting impact fatigue generated by frequent slewing under heavy‑load construction scenarios, effectively extending service life of gear meshing surfaces.
2. High‑precision gear grinding craft: Sun gear and planetary carrier mating surfaces are finely ground, guaranteeing smooth gear engagement. It greatly lowers friction heat generation, reduces metal abrasion debris inside the swing gearbox, avoids premature damage to matching ring gear and planetary pinions.
3. Strict dimensional control: Every key dimension including spline tolerance, mounting hole position and gear tooth profile is inspected one‑by‑one. Perfect compatibility for original swing gearbox housing, installation can be finished smoothly without extra machining work, saving lots of repair time for maintenance shops.
4. Cost‑effective repair solution: Compared with expensive original whole swing reducer assembly, replacing this planetary carrier & sun gear assembly is an economical maintenance option. It restores normal swing performance while cutting down customers’ equipment overhaul expenditure.

We specialize in producing excavator planetary transmission spare parts. Each batch undergoes multiple inspection procedures including material composition verification, hardness testing and meshing test before shipment. Finished goods are protected by anti‑rust oil and sealed packaging to prevent oxidation and scratch during long‑distance ocean transportation. We support bulk wholesale for repair workshops, trading companies and overseas distributors, flexible MOQ is available.

Q1: What failure symptoms indicate I need to change this 2nd planetary carrier assembly? A: If your machine presents swing with obvious knocking noise, intermittent jitter when rotating, weak slewing power, or metal particles found in gearbox oil during oil change, you should inspect the second‑stage planetary set inside swing gearbox.

Q2: Can this part fit other Kobelco models besides SK350‑8? A: This assembly is mainly designed for SK350‑8. Before ordering, please double‑check your old part number LC32W01008P1 / LC32W01024P1 to confirm compatibility, do not install for unmatched models blindly.

Q3: Any tips during installation? A: Please clean the inside of swing gearbox thoroughly, remove all worn metal residues. Replace gearbox oil and sealing parts together after assembly, run no‑load test firstly before putting machine into heavy‑duty operation.

Q4: What about after‑sales support? A: We provide quality guarantee for qualified production defects. Damage caused by improper installation, lacking lubrication or overload working will not be covered under warranty. Please operate strictly follow excavator maintenance specification.