Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-2
Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-1
Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-3
Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-4
Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-5
Tatan PCR-3B 708-8H-00030 swing motor assembly for Komatsu PC40-7 excavator-6

PCR-3B 708-8H-00030 Swing Motor Assembly for Komatsu PC40-7 Excavator

Does your Komatsu 4-ton mini excavator suffer from upper structure drift on slopes or weak slewing torque when swinging a full bucket? The PCR-3B 708-8H-00030 Swing Motor Assembly by Tatan is engineered specifically for Komatsu PC40-7, PC40-7R, and PC45-7 excavators. Combining a Kayaba PCR-3B hydraulic piston motor with a heavy-duty planetary gear drive, this complete assembly restores 100% rotation torque and wet disc parking brake hold without any hose modifications.

Need an Instant Quote for PCR-3B 708-8H-00030 Swing Motor?

Contact Senior Parts Specialist Gavin directly:

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5 Key Solutions Buyers Get from Tatan:

  • Fixes Upper House Drift & Slewing Lag: Restores full 24.5 MPa holding brake pressure to eliminate arm drifting when parked on inclined slopes.
  • 100% Precision 12T Drive Pinion Match: Pre-machined 12-teeth drive pinion shaft meshes perfectly with Komatsu PC40-7 swing bearing ring gears.
  • High-Pressure NOK Lower Shaft Seals: Prevents gear lube from leaking down into the swing bearing tub and destroying the planetary gears.
  • 100% Factory Bench Tested Under Load: Hydraulic bench tested for flow rate, relief pressure calibration, and noise-free gear mesh before shipping.
  • Factory Direct Wholesale Price: Cut middleman markup and save up to 40% on excavator slewing drive replacement with 12 months warranty.
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Description

PCR-3B 708-8H-00030 Swing Motor Assembly Overview

The PCR-3B 708-8H-00030 Swing Motor assembly (OEM Part Numbers: 708-8H-00030, 708-8H-00031, 708-8L-00130, PCR-3B) manufactured by Tatan is a high-torque Kayaba series hydraulic slewing motor belonging to our Excavator Swing Motor Assembly classification. Engineered specifically for Komatsu PC40-7, PC40-7R, and PC45-7 4.0-to-4.5 ton excavators, replacing your worn slewing motor with a Tatan complete assembly restores 100% swing torque, precise holding brake capability, and smooth rotation speed instantly.

Built strictly according to original OEM specifications, this hydraulic swing motor integrates a heavy-duty planetary gear reduction gearbox and wet multi-disc parking brake, ensuring 100% direct bolt-on mounting to swing bearings without hose or flange modifications.

⚠️ Slewing Fitment Technical Verification: Komatsu PC40-7 excavators may feature different drive pinion teeth counts (12T vs. 13T) or relief valve setups depending on production years. Please send your original swing motor nameplate photo or pinion shaft dimensions to Gavin for free verification before dispatch.

Key Attributes & Parameters for PCR-3B 708-8H-00030 Swing Motor

Product CategoryExcavator Swing Motor AssemblyWarranty1 Year / 12 Months
Specific Motor ModelKayaba PCR-3B / Nachi MotorBrand NameTatan
Compatible EquipmentKomatsu PC40-7 | PC45-7 ExcavatorOEM Part Number708-8H-00030 / PCR-3B
Matched Engine SeriesKomatsu 4D84-2A / Yanmar 4TNE84 EnginePlace of OriginGuangdong, China
Max Relief Pressure24.5 MPa (245 bar / 3550 PSI)Rated Swing Speed9.5 RPM Slewing Rate
Brake SystemMechanical Multi-Disc Wet BrakePinion Shaft Spec12-Teeth Drive Pinion (12T)
Machinery Test ReportProvided (100% Bench Tested)Video Outgoing-InspectionProvided Before Shipping
Quality Status100% Brand New with GearboxPackagingExport Wooden Box Packaging

Supported Machinery Brands & Swing Motor Parts Coverage

In addition to Komatsu, Tatan manufactures replacement complete swing motors and reduction gearboxes for major excavator brands:

Tatan Compatible Excavator Machinery Brands Display Komatsu Kobelco Caterpillar Hitachi Volvo Doosan

Application Scenarios & Buyer Value

When upgrading or replacing your 4-ton excavator slewing system with our PCR-3B 708-8H-00030 Swing Motor, buyers achieve maximum operational uptime and precise rotation control:

Application ScenarioValue Delivered to Buyer
Komatsu PC40-7 Swing Motor Replacement1:1 direct bolt-on replacement eliminates machine downtime and restores original slewing speed.
Hydraulic Repair WorkshopsReplaces tedious internal component rebuilding; reduces labor hours and eliminates aftermarket warranty risks.
Parts Dealers & StockistsHigh-demand 4-ton excavator replacement motor ready for immediate resale to contractors and plant hire companies.
Rental Fleet MaintenanceCost-effective replacement option extending total Komatsu 4-ton excavator service lifecycle.

PCR-3B 708-8H-00030 Swing Motor OEM Diagnostic Guide

Use this OEM manual hydraulic diagnostic guide to troubleshoot slewing symptoms on your Komatsu PC40-7 excavator:

Hydraulic/Mechanical SymptomTechnical Cause AnalysisTatan Factory-Grade Solution
1. Slow slewing speed & weak rotation torque under heavy bucket loadPCR-3B motor piston shoe wear or anti-reverse relief valve leakage causing internal pressure drop (<24.5 MPa).Install Tatan PCR-3B complete swing motor assembly; flush hydraulic lines and adjust pilot relief valve pressure.
2. Heavy metallic grinding noise in swing reducer gearboxPlanetary gear tooth pitting, sun gear wear, or needle bearing collapse due to insufficient gear oil lubrication.Replace complete swing motor gearbox assembly; refill with heavy-duty SAE 80W-90 gear oil.
3. Machine upper house drift / Brake slipping on incline slopesMulti-disc wet parking brake friction plate wear or brake release pilot pressure line leakage.Inspect brake release pilot pressure (>2.5 MPa); replace brake friction plates or install new swing motor assembly.
4. Gear oil leaking into swing bearing tubLower shaft oil seal breakdown or casing drain line pressure spike blowing out drive pinion seal.Clear casing drain return lines, replace lower pinion shaft seal with high-pressure NOK seal.

Transport Packaging & Fast Global Shipping

To ensure 100% damage-free international transport, every Tatan PCR-3B 708-8H-00030 swing motor assembly undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging.

Global shipping supported by multiple logistics companies DHL FedEx UPS Sea Air Freight

✈️ Express Air Courier

Partnered with DHL, FedEx, UPS, and TNT for express door-to-door delivery worldwide.

🚢 Sea Cargo Freight

LCL and FCL ocean container shipping for heavy swing motor assemblies and bulk orders.

📦 Export Wooden Cases

Fumigated solid wooden boxes with thick shockproof foam lining for maximum safety.

Quality Control & International Certificates

Tatan hydraulic swing motors are manufactured under ISO 9001 quality management systems and strictly comply with CE safety standards.

Tatan Quality Assurance ISO9001 CE Qualification Certificates

PCR-3B 708-8H-00030 Swing Motor FAQ & Related Categories

Q1: Is this PCR-3B 708-8H-00030 Swing Motor assembly compatible with Komatsu PC40-7 and PC45-7 excavators?
A: Yes. The PCR-3B swing motor is the standard OEM motor for Komatsu PC40-7, PC40-7R, and PC45-7 excavators. Send your original swing motor nameplate photo to Gavin for precise pinion shaft teeth verification.
Q2: Does the swing motor assembly include the planetary reduction gearbox?
A: Yes. Tatan complete swing motor assemblies come pre-assembled with hydraulic piston motor, multi-disc parking brake, and planetary reduction gear drive ready for installation.
Q3: What are the primary OEM part numbers for the Komatsu PC40-7 swing motor?
A: Common OEM reference numbers include 708-8H-00030, 708-8H-00031, 708-8L-00130, and PCR-3B.

Get Wholesale Factory Quote for PCR-3B 708-8H-00030 Swing Motor

Looking for direct factory pricing, stock availability, or technical advice for PCR-3B 708-8H-00030 swing motors? Contact senior engineer Gavin now!

💡 Fast Quote: Send your machine serial number or old motor photos for a 100% accurate match within 10 minutes!

* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.

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