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E336D E345D E349D Excavator Machinery Parts Final Drive Swing Gear Box

E336D E345D E349D Excavator Machinery Parts Final Drive Swing Gear Box

E336D Excavator Machinery Parts

E349D Excavator Machinery Parts

Final Drive Swing Gear Box

Place of Origin:

China

Model Number:

E336D

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Product Details
Origin:
Made In China
Warranty:
12 Months
Machine Model:
E336D
Catagory:
Excavator Spare Parts
Part Name:
Rotary Base
Type:
Excavator Final Drive
Highlight:

E336D Excavator Machinery Parts

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E349D Excavator Machinery Parts

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Final Drive Swing Gear Box

Payment & Shipping Terms
Minimum Order Quantity
1 Pc
Packaging Details
Carton
Delivery Time
5-7days
Payment Terms
T/T
Product Description

E336D E345D E349D Excavator Final Drive Swing Reduction Gearbox Parts (Without Motor) Rotary base

 

The excavator slewing reducer (widely called slewing gearbox) is a critical transmission part that connects the slewing motor with the large slewing ring gear. It is mainly designed for speed reduction and torque multiplication, enabling the excavator upper structure to perform smooth 360° rotation.

Core Structure

  • Sun gear: Connected to the slewing motor via splines to receive high-speed power input.
  • Planet gear: 3 to 4 units per stage; rotates around the sun gear while spinning on its own axis to transmit torque.
  • Ring gear: Fixed to the reducer housing and keeps meshed with planet gears.
  • Planet carrier: Acts as the power output end and drives the lower drive pinion.
  • Brake: Integrated wet multi-disc brake; spring-on braking and hydraulic pressure release to avoid unintended slewing drift.
  • Housing & bearing: Adopts high-strength cast or forged steel housing, fitted with heavy-duty bearings, featuring reliable dustproof and oil-sealing performance.

Working Principle

High-speed low-torque power delivered by the hydraulic motor passes through the sun gear, first-stage planet gears and first-stage planet carrier, then transfers to the secondary sun gear, secondary planet gears and secondary planet carrier for final output. The drive pinion rotates at low speed with high torque, meshes with the inner ring gear of the slewing bearing, and drives the upper structure to rotate.

Common Faults & Causes

  • Abnormal noise and jitter: Gear wear and pitting, bearing failure, lubrication shortage or oil contamination, improper meshing clearance.
  • Oil leakage: Aged oil seals, housing cracks, overfilled lubricant, blocked breather valve.
  • Sluggish and weak slewing: Worn gears or bearings, brake drag failure, motor internal leakage, improper speed ratio matching.
  • Overheating: Low oil level or oil degradation, overload operation, persistent brake dragging, poor heat dissipation condition.
  • Gear jumping and tooth breakage: Severe impact load, foreign substance intrusion, material fatigue wear, assembly misalignment.
Machinery Test Report Provided Warranty 1 Year
Video outgoing-inspection Provided Brand Name OEM
Place of Origin China Product Name Swing Reduction Gearbox
Product description Main Final Drives Assembly Quality OEM Standard
Condition Brand New Model Number E336D E345D E349D
MOQ 1 Piece Delivery Time 5-7 Days
Material Cast Iron Packing Carton
 
 
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