products details

Home Products

E320D2 378-9517 Excavator Swing Gear Box OEM High Torque Reduction Gearbox

Name: E320D2 378-9517 Excavator Swing Gear Box OEM High Torque Reduction Gearbox
Brand: Lanzhou Fudong Guangqi Trading Co., Ltd
SKU: E320D2
Price: Negotiable USD
Availability: InStock

Model Number:	E320D2
MOQ:	1 Pc
Payment Terms:	T/T

Detail Information

Product Description

Detail Information

Place of Origin:

China

Type:

Gearbox

Productname:

Swing Motor Gearbox

Application:

Excavator

Model:

E320D2

Color:

Yellow

Packaging Details:

Carton

Highlight:

E320D2 Excavator Swing Gear Box

OEM High Torque Reduction Gearbox

E320D2 High Torque Reduction Gearbox

Product Description

E320D2 378-9517 Excavator Swing Gear Box OEM High Torque Reduction Gearbox

Popularly referred to as the swing gearbox, the swing reducer on an excavator is an essential transmission part connecting the slewing motor and the large slewing gear ring. It primarily serves to decelerate rotation and increase torque, allowing the upper framework to rotate smoothly 360 degrees in all directions.

Critical Component Structure

Sun Gear: Coupled to the slewing motor’s spline section, accepting high‑speed power input.
Planet Gears: Three to four gears per stage, moving around and rotating on the sun gear to transmit torque power.
Ring Gear: Secured within the housing and engages with planet gear units.
Planet Carrier: Outputs driving power to operate the lower small drive gear.
Brake: Internal wet‑style multi‑plate brake, engaged by spring force and released by hydraulic pressure, stopping reverse slewing motion.Housing and Bearings: Heavy‑duty cast or forged steel housing supported by high‑load bearings, dust‑proof and oil‑leakage‑resistant.

High‑speed low‑torque power generated by the hydraulic motor is delivered through the sun gear, first‑stage planetary set and second‑stage planetary set to the output planet carrier. The low‑speed high‑torque pinion meshes with the inner gear ring of the slewing bearing, driving the upper machine body to slew.

Frequent Fault Issues & Underlying Causes

Unusual sound / Unstable movement: Gear abrasion and pitting corrosion, bearing damage failure, lack of lubricating oil or oil contamination, improper gear meshing backlash gap.
Oil seepage and leakage malfunctions: Damaged oil seal rings, housing structural fractures, excessive lubricant filling height, blocked air‑vent breather opening.
Sluggish or weak rotational slewing: Worn gears and bearing parts, incomplete brake release action, internal bypass flow leakage of hydraulic motor, non‑compatible gear transmission ratio.
Overheating excess phenomenon: Inadequate oil volume or degraded lubricant quality, overloaded working status, continuous brake dragging friction, poor heat dispersion efficiency.
Gear jumping / Tooth fracture damages: Impact‑caused heavy loads, foreign impurity infiltration, fatigue wear degradation, shaft misalignment errors during assembly work.

Machinery Test Report	Provided	Warranty	3 Months
Video outgoing-inspection	Provided	Brand Name	OEM
Place of Origin	China	Product Name	Excavator Final Drive
Product Description	Swing Reduction Gearbox	Quality	OEM Standard
Condition	Brand New	Model Number	E320D2
MOQ	1 Piece	Delivery Time	5-7 Days
Application	Excavator	Packing	Standard Packing

Company Profile

Tags:

Excavator Machinery Parts

Hydraulic Main Control Valve

Diesel Engine Parts

Hydraulic Main Pump

Excavator Swing Motor

Excavator Travel Motor

Swing Motor Gearbox

Excavator Hydraulic Cylinder

Swing Motor Case

Excavator Joystick Handles

Excavator Foot Pedal Valve

Travel Motor Gearbox

Excavator Turbocharger

products details