842140002 swing motor for Komatsu PC12R-8 PC15R-8 mini excavator
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Component: Swing Motor Device Assembly (High Quality Aftermarket new)
Machine Compatibility:
Komatsu PC12R-8 Mini Excavator
Komatsu PC15R-8 Mini Excavator
Condition: Genuine New / Original Brand
System Function: Drives the upper structure swing mechanism for precise 360-degree cabin rotation.
2. Technical Specifications
Type: Fixed Displacement Axial Piston Motor
Design Integration: Includes the hydraulic motor block, mechanical parking brake system, and relief valve network in a single compact housing.
Performance: Factory-calibrated to deliver maximum starting torque and smooth deceleration braking without hydraulic shock.
Standards: Manufactured to exact Komatsu OEM metallurgy and engineering clearances to guarantee factory-standard swing speed.
3. Critical Installation Requirements
Case Priming (Mandatory)
You must manually fill the swing motor housing with clean hydraulic oil through the highest case drain port before operating the machine. Running the motor dry for even a few seconds will cause immediate mechanical failure of the piston shoes and cylinder block.
Clear the Case Drain Line
Ensure the case drain line back to the hydraulic tank is completely unobstructed and free of backpressure. A blocked or restricted drain line will instantly blow out the main shaft seal, leading to external oil leaks.
Gear Greasing & Cleanness
Clean the mounting face on the excavator chassis thoroughly. Liberally grease the output shaft pinion and the main swing bearing ring gear with heavy-duty lithium grease during installation.
System Decontamination
If the previous swing motor failed mechanically (sending metal fragments into the oil), you must flush the swing circuit hoses, clean the hydraulic reservoir, and change all system filters before startup.
4. Frequently Asked Questions (FAQ)
Q: Are the swing motors for the PC12R-8 and PC15R-8 fully interchangeable?
A: Yes, the PC12R-8 and PC15R-8 share the same structural frame size and hydraulic platform for the upper swing drive system. However, always verify your exact Machine Serial Number prior to shipping to ensure matching hydraulic line port fittings.
Q: My mini excavator cabin drifts or rotates slowly on a slope when joysticks are neutral. Is the swing motor bad?
A: This symptom usually points to a worn internal mechanical parking brake disc stack or leaking swing relief valves within the motor device. Replacing the complete genuine motor assembly resolves both issues.
Q: How is this component packaged for safe transit?
A: The genuine swing motor is preserved with anti-corrosion oil, sealed in a moisture-proof vapor barrier, and packed securely inside a heavy-duty, impact-resistant shipping box to prevent any shaft or port damage during logistics.
5. Shipping & Logistics
Packaging: Export-grade reinforced protective casing.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days.