Hydraulic Swing Motor 31QA-10142ar for R380LC-9, R380LC-9A, Excavator Slew Motor

Product Description

 

Product Description (Swing Reduction Gearbox)

Product Overview

This high-performance swing reduction gearbox is engineered for 38-43 ton heavy-duty excavators. It serves as a core component of the slewing system, delivering stable power output, large torque and outstanding durability for long-hour construction operations. The unit is a direct replacement part with fully compatible mounting dimensions and connection ports, easy for installation and maintenance.

Key Features

1. Premium Material & Fine Craftsmanship

   

   The gearbox housing adopts alloy cast steel structure, high strength and strong impact resistance. All gears are processed by carburizing and quenching treatment, with hardness up to HRC58-62, effectively resisting wear and crack during heavy load work. Matched with high-quality bearings and fluorine rubber oil seals, the whole unit is high temperature resistant and long service life.
2. Excellent Working Performance

   

   Optimized internal gear structure ensures transmission efficiency over 97%. It runs smoothly with low noise below 75dB. Cooling rib design on the shell effectively controls oil temperature, preventing performance decline under continuous high-temperature working conditions. It provides powerful swing torque to adapt to various harsh construction sites.
3. Standard Production & Good Compatibility

    

   Manufactured strictly in accordance with original technical standards, 1:1 interchangeable with related part numbers 31QA-10140, 31QA-10141, 31QA-10142. No modification is needed during replacement. Original technical support is available for all products.
4. Strict Quality Control

    

   All products are brand new and 100% fully inspected before delivery. No refurbished parts. Each piece comes with qualified certificate to guarantee reliable quality.

Applicable Models

R380LC-9, R380LC-9A, R380LC-9DM, R380LC-9SH, HX380L, HX430L

Product Parameters

• Part Number: 31QA-10142AR
• Application: Excavator Swing System
• Suitable Tonnage: 38-43 ton
• Gear Hardness: HRC58-62
• Transmission Efficiency: ≥97%
• Working Noise: ≤75dB
• Structure: Gearbox only (motor not included)

Warranty & Service

Warranty period: 12 months or 2000 working hours, whichever comes first. We provide professional after-sales consultation and technical guidance.

Packaging & Delivery

Packed with IPPC certified solid wooden fumigated case, moisture-proof, shockproof and pressure-resistant, suitable for sea and air transportation. Neutral export packaging is supported.

 

In-stock items can be shipped within 3-7 days. Bulk orders will be delivered in 7-15 days.

Common FAQ

1. What is this product? Which machines does it fit?

    

   This is a swing reduction gearbox without motor, specially designed for 38-43 ton excavators. Compatible with R380LC-9, R380LC-9A, R380LC-9DM, R380LC-9SH, HX380L, HX430L. It can replace 31QA-10140, 31QA-10141 and 31QA-10142 directly.
2. Does it follow original technical standards?

    

   Yes. It is produced according to original specifications and supports original technical standards for direct replacement.
3. What are the common faults and solutions?

    

   Weak or slow swing: Check hydraulic pressure, motor internal leakage and gear wear.

    

   Oil leakage: Replace aging fluorine rubber oil seal or adjust uneven mounting surface.

    

   Abnormal noise: Inspect damaged gears or bearings, replace the assembly if necessary.
4. Can I purchase the gearbox separately?

    

   Yes, this item is sold individually, excluding swing motor.