Description
KMF90 706-7G-01170 Swing Motor Assembly Overview
The KMF90 706-7G-01170 Swing Motor assembly manufactured by Tatan is a heavy-duty fixed-displacement axial piston hydraulic unit belonging to our Swing Motor Assembly classification. Engineered specifically for Komatsu PC270-7 and PC270LC-7 27-ton excavators, replacing your worn swing motor with a Tatan complete assembly eliminates carriage drifting on slopes, restores instantaneous swing braking torque, and cures internal casing pressure bypass across demanding quarry and excavation applications.
Operating under direct pressure flow from the excavator’s main hydraulic pump and routed through the PC270-7 main control valve, this rotating motor incorporates precision micro-lapped bimetal valve plates, a hydraulic-release parking brake pack, and dual anti-reaction shock relief valves, ensuring 100% direct bolt-on installation with swing reduction gearboxes and chassis pilot lines.
Key Attributes & Technical Parameters for KMF90 706-7G-01170 Swing Motor
| Product Category | Swing Motor Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Komatsu KMF90-2 Axial Piston Swing Motor | Brand Name | Tatan |
| Compatible Equipment | Komatsu PC270-7 | PC270LC-7 Excavator | OEM Part Number | 706-7G-01170 / 706-7G-01140 |
| Matched Engine Series | Komatsu SAA6D102E-2 Diesel Engine (140 kW) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 28.4 MPa (284 bar / 4120 PSI) | Pilot Control Pressure | 3.9 MPa (39 bar Brake Release) |
| Spool Precision Spec | Micro-Lapped < 0.003 mm Clearance | Quality Status | 100% Brand New Complete Assembly |
| Machinery Test Report | Provided (100% Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | ISO VG 46 / VG 68 Anti-Wear Oil | Packaging | Export Wooden Box Packaging |
Supported Excavator Machinery Brands & Swing Motor Coverage
In addition to Komatsu, Tatan manufactures and supplies replacement swing motors, reduction pinions, and internal rotating kits for major heavy equipment builders:
Multi-Brand Fleet Support & Heavy Slewing Drive Engineering
Handling the high angular momentum of 27-ton heavy excavators requires rugged engineering. Tatan delivers complete slewing drives, wet brake packs, and shock-cushion hydraulic assemblies across diversified heavy machinery fleets:
🛑 Zero Slope Drift
Heavy multi-disc wet friction plates lock rotation on 30-degree slopes immediately upon neutral joystick return.
🛡️ Ring Gear Protection
Factory-calibrated 28.4 MPa anti-reaction shock valves absorb stopping inertia, protecting slewing reduction ring gears.
❄️ Thermal Durability
Micro-lapped bimetal valve plates eliminate high-pressure casing bypass, keeping operating temperatures safely under 80°C.
Application Scenarios & Buyer Value
When upgrading or replacing your 27-ton excavator rotation drive with our KMF90 706-7G-01170 Swing Motor, buyers achieve maximum operational uptime and flow control:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Komatsu PC270-7 Motor Replacement | 1:1 direct bolt-on installation eliminates carriage drift on slopes and restores snappy, accurate boom swing positioning. |
| Hydraulic Overhaul Workshops | Avoids the complex labor of brake disc shimming and barrel lapping; saves mechanic hours with a pre-adjusted unit. |
| Mining & Quarry Fleet Operations | Heavy-duty forged pistons and anti-rebound valves withstand harsh shock loads during high-speed continuous truck loading. |
| Heavy Equipment Parts Stockists | Fast-moving, high-demand 27-ton swing motor inventory ready for immediate shipment to minimize customer downtime. |
KMF90 706-7G-01170 Swing Motor OEM Diagnostic & Troubleshooting Guide
Use this OEM manual hydraulic diagnostic guide to troubleshoot swing motor symptoms on your Komatsu PC270-7 excavator:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Upper carriage creeps / drifts when parked on side incline | Mechanical parking brake friction discs glazed or brake release piston seal leaking pilot pressure into case drain. | Replace with Tatan 706-7G-01170 complete swing motor assembly with factory pre-seated heavy-duty brake pack. |
| 2. Violent shudder / shaking when stopping swing motion | Anti-reaction check valve poppet contamination or swing cushion relief valve spring fatigue failing to dampen inertia. | Ultrasonic clean relief cartridges, reset 28.4 MPa relief pressure, or install new Tatan complete motor assembly. |
| 3. Weak swing acceleration and overheating motor case | Severe friction scoring across bronze valve plate and cylinder block face allowing high-pressure fluid bypass into case drain. | Install Tatan new 706-7G-01170 swing motor; flush hydraulic lines and install fresh 10μm return filter element. |
| 4. Complete loss of rotation while travel/boom functions work | Brake release delay valve stuck closed preventing 3.9 MPa pilot pressure from compressing brake release springs. | Check brake pilot pressure at motor port, clean delay valve shuttle, or replace swing motor assembly. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan PC270-7 swing motor undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging:
KMF90 706-7G-01170 Swing Motor FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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