Komatsu PC40 R8 Swing Drive Unit

Komatsu PC40 R8 Swing Drive Unit

2 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

Swing Motor Head for Komatsu PC40‑R8

Product Overview

This Swing Motor Head is the core power unit of the slewing mechanism for Komatsu PC40‑R8 mini excavator, adopting Hydraulic piston motor structure. As the executive component of the whole hydraulic motor, it converts hydraulic energy into rotary torque, drives the upper platform of construction Machine to rotate stably. It is an indispensable part of the excavator hydraulic system, matching the original slewing reducer and hydraulic control circuit. With high‑precision internal friction pairs and heavy‑duty sealing design, it adapts to frequent forward‑reverse rotation and harsh construction environments. It is widely used for original equipment matching, field overhaul and aftermarket spare‑parts replacement of small excavator Machine.

Technical Specifications

- Applicable Model: Komatsu PC40‑R8 mini excavator

- Product Type: Hydraulic piston motor, swing motor head assembly

- Max working pressure: 34.3 MPa

- Built‑in safety relief valve and parking brake

- Structure: Axial piston hydraulic motor with integrated brake valve group

- Working medium: Anti‑wear hydraulic oil for mobile hydraulic system

- Operating temperature: ‑20℃ ~ +80℃

- Housing material: High‑strength cast iron

- Feature: Compact flange installation, stable torque output, low internal leakage, excellent interchangeability, perfectly matches the slewing loop of PC40‑R8 Machine

- Main function: Realize 360° clockwise and counter‑clockwise rotation of excavator upper body

Working Principle

High‑pressure hydraulic oil from the main control valve of the hydraulic system enters the oil inlet and outlet ports of this Hydraulic piston motor. The pressure oil pushes the piston group inside the cylinder block to produce rotary motion, outputs torque to drive the slewing reducer. The built‑in brake valve automatically locks the oil circuit when the machine stops rotating, preventing the upper platform from sliding freely. When the internal parts of the hydraulic motor are worn or stuck, faults such as weak slewing power, slow rotation speed and abnormal noise will occur on the Machine. Replacing qualified swing motor head can restore the slewing performance and ensure stable operation of the whole hydraulic system.

Core Advantages

1. Strictly follow original dimension standards, direct replacement without secondary processing, convenient for on‑site maintenance of excavator Machine.

2. High‑precision piston and valve plate matching, low volumetric loss, strong anti‑pollution performance, suitable for dusty construction sites.

3. Integrated safety valve and parking brake, improve operation safety, avoid accidental rotation of the platform, protect the hydraulic system from overload impact.

4. Optimized sealing assembly, effectively reduce oil leakage, extend service life of the hydraulic motor under long‑term heavy‑duty operation.

5. Every unit undergoes pressure test before delivery, stable performance, matching the original slewing mechanism of Komatsu PC40‑R8.

Application Range

Swing Motor Head for Komatsu PC40‑R8 is a key spare part of the slewing hydraulic motor. It undertakes the rotary driving task in the hydraulic system of small excavator Machine. Mainly applied to 4‑ton mini excavators, earthmoving equipment and small construction machinery. Supplied for machinery repair workshops, maintenance stations and global aftermarket spare‑parts trading.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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4 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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