Description
Tatan Machinery supplies 100% Brand New hydraulic swing motor assemblies (OEM part numbers: 708-7S-00130 / 708-7S-00131, interchangeable with 708-7S-00132 / 20T-26-00020) engineered for Komatsu PC35MR-2, PC35MR-3, and PC30MR-2 zero-tail mini excavators. Operating in tight urban and residential jobsites where the revolving superstructure rotates within the track width, this high-pressure axial piston motor features an integrated mechanical wet-disc parking brake, twin anti-rebound cushion relief valves, and a delayed brake-release valve. Backed by our 12-Month Comprehensive Replacement Warranty, each assembly is completely bench-tested for holding torque, slew smoothness, and zero case-drain leakage.
Supplier Information & Build Status
| Supplier: | Tatan Machinery (Professional Excavator Parts Supplier) |
| Product Category: | Excavator Swing Motor Assembly / Hydraulic Parts |
| Component Type: | Axial Piston Swing Motor with Integrated Anti-Shock Relief Valve Block |
| OEM Assembly Part No: | 708-7S-00130 (Cross Ref: 708-7S-00131, 708-7S-00132, 20T-26-00020) |
| Product Condition: | 100% Brand New (Zero Hours, Pre-Tested Complete Assembly with Relief Cartridges) |
| Warranty Coverage: | 12 Months / 1-Year Comprehensive Replacement Warranty |
| Target Machine Brand: | Komatsu Excavator Parts |
🏢 Tatan Machinery Hydraulic Swing Motor Testing Facility
Physical inventory storage, hydraulic motor bench testing, and export packaging facility:
Physical inventory — ready for global crating. Video inspection calls and warehouse visits welcome.
Technical Specifications
| Parameter | Specification Data |
|---|---|
| Motor Design | Fixed-Displacement Swashplate Axial Piston Motor (Zero-Tail Slew Type) |
| Working Circuit Relief Pressure | 20.6 MPa (210 bar / 2,987 PSI) Factory Preset Overload Port Relief |
| Rated Slew Speed | Approx. 9.0–9.5 RPM Upperstructure Revolutions |
| Mechanical Parking Brake | Spring-Applied, Hydraulically Released Wet Multi-Disc Friction Brake |
| Shock Damping Cushion System | Precision Anti-Reaction Check Valves with Calibrated Slew Damping Orifices |
| Total Assembly Weight | Approx. 32 kg (70.5 lbs) Complete Motor Head with Integrated Valve Block |
| Standard Machine Match | Komatsu PC35MR-2, PC35MR-3, PC30MR-2 (3.7-Ton Zero-Tail Class) |
When to Replace the Swing Motor on Komatsu PC35MR-2: Field Diagnostics
Operating zero-tail excavators in tight demolition or close to retaining walls requires surgical slew control. When internal hydraulic wear strikes, replace the complete assembly under these severe symptoms:
- Slew Over-Travel & Wall Collision Risk (Anti-Reaction Valve Failure): When letting go of the swing joystick to stop next to a structure, the excavator cab rebounds backward violently or drifts 10-15 cm before stopping. The internal anti-reaction shock relief valves are scored or jammed with carbonized oil.
- Upperstructure Slope Creep & Slew Drift on Inclines: Parking on a foundation slope with the swing joystick centered, the bucket and cab slowly rotate downhill. The wet parking brake friction plates are burned and glazed, or the valve plate has micro-bypass leakage directly to tank.
- Low-Speed Slew Chattering & Erratic Shudder: When inching the bucket into a narrow trench, the swing jerks and shudders instead of rotating smoothly. High internal case-drain leakage indicates the cylinder barrel and brass slipper shoes have scored.
- Hydraulic Oil Leaking Past Shaft Seal into Slew Reduction Gearbox: High drain backpressure blowing out the motor output shaft seal, flooding the planetary reduction gearbox with hydraulic oil and blowing oil out through the gearbox dipstick.
Workshop Bench Testing & 12-Month Warranty Guarantee
Every 100% Brand New 708-7S-00130 swing motor supplied by Tatan Machinery comes backed by a 12-Month Comprehensive Replacement Warranty. Before export packaging, our technicians complete a 5-point quality validation:
- Slew Overload Relief Pressure Calibration: Port overload relief cartridges calibrated to exact Komatsu PC35MR-2 factory specifications (20.6 MPa / 210 bar) on a digital motor test bench.
- Mechanical Parking Brake Static Hold Test: Verifying the multi-disc wet friction brake firmly locks rotation at zero pilot pressure and releases cleanly when pilot signal is applied.
- Anti-Reaction Damping Orifice Verification: Testing the cushion check valve flow curve to ensure smooth stopping without uncommanded swing bounce.
- Case-Drain Internal Leakage Measurement: Precision flow-meter measurement at working oil temperature (55°C) to verify volumetric efficiency (>92%).
- Drive Spline Shaft Hardness & Concentricity Check: Coordinate measurement of output shaft splines to ensure backlash-free engagement with the PC35MR-2 planetary slew gearbox.
📹 Live Swing Motor Workshop Inspection Video
Watch our engineer verify swing motor relief valves, brake pilot port, and output splines:
✓ Real physical unit filmed at Tatan Machinery workshop
Export Heavy-Duty Packaging Process
Precision motor rotating groups require absolute protection against moisture and freight shock:
- 100% Sealed Metal Port Caps: Main working ports, brake release pilot port, and case drain port fitted with heavy-duty metal blanking caps.
- Anti-Corrosion Wax Coating: Output drive splines and unpainted mounting pilots coated with heavy anti-rust grease and vacuum-sealed in VCI protective foil.
- Custom Molded Internal Framing: The motor is securely braced upright inside structural high-density wood cushioning.
- ISPM 15 Fumigation-Free Solid Plywood Box: Sealed export crate banded with galvanized steel straps.
Actual sealed port caps and heavy-duty crating for 708-7S-00130 swing motor
Global Shipping & Customs Documentation
Fast, reliable dispatch tailored for commercial contractors and parts wholesalers worldwide:
- Emergency Machine Down Air Cargo: Fast air express via DHL Aviation, FedEx Freight, or international airlines within 3–7 business days.
- Consolidated Ocean Sea Freight (LCL / FCL): Direct containerized shipping to worldwide commercial ports.
- Clean Customs Clearance Paperwork: Commercial Invoices with correct HS Code (8412.29 – Hydraulic Motors), Packing Lists, and Certificates of Origin for tariff optimization.
Container loading and air freight dispatch supported by global logistics partners
Critical Installation Guidelines (PC35MR-2 Slew Mechanic Checklist)
To prevent instant dry-run failure and protect your 12-month warranty, technicians MUST adhere to these critical procedures:
- MANDATORY: Pre-Fill Motor Casing with Clean Hydraulic Oil: Before connecting working hoses, remove the top case-drain plug and fill the motor casing completely with clean ISO VG 46 hydraulic oil. Running a new swing motor dry for even 3 seconds will instantly seize the rotating cylinder barrel!
- Clean Slew Gearbox Grease Cavity: Before mounting the motor, inspect the grease level inside the planetary slew reduction gearbox. Remove old contaminated sludge and refill with fresh extreme-pressure molybdenum disulfide grease.
- Verify Parking Brake Release Pilot Pressure: Hook up a pressure gauge to the brake release port. Confirm that the pilot signal reaches at least 2.5–3.5 MPa when the swing joystick is moved, ensuring the brake friction discs release completely without dragging.
- Case Drain Hose Inspection: Ensure the case drain hose returning to the hydraulic reservoir is 100% free of kinks or blockage. High drain backpressure will blow out the motor output shaft seal!
- Bleed Air on Low-Idle Rotation: Operate the swing left and right at low engine idle for 5 minutes without hitting end-stops to purge all air from the relief manifold.
Buyer Frequently Asked Questions (Purchasing FAQ)
Q: Is this 708-7S-00130 swing motor brand new or remanufactured? Does it include the brake pack?
A: This swing motor is 100% Brand New with zero operating hours. It comes completely assembled with a brand-new internal wet friction brake pack, dual port relief valves, and anti-rebound shock valves. It is a complete drop-in replacement ready to bolt directly onto your PC35MR-2 reduction gearbox.
Q: What is covered under your 12-month warranty for this swing motor?
A: Our 12-Month Comprehensive Warranty covers all internal mechanical and hydraulic failures resulting from manufacturing or metallurgical defect—including cylinder barrel seizure, piston shoe detachment, valve plate scoring, brake spring fatigue, and shaft spline failure. If any defect arises under proper hydraulic operating conditions, Tatan Machinery provides prompt replacement support.
Q: My PC35MR-2 has part number 708-7S-00131 or 20T-26-00020. How do you confirm fitment?
A: These are interchangeable Komatsu OEM part numbers used across PC35MR-2, PC35MR-3, and PC30MR-2 production batches. Send your machine’s serial number (PIN) from the cab tag and photos of your current motor nameplate to Gavin. We cross-verify the exact motor arrangement code in the official Komatsu parts database within 10 minutes.
Q: Can I see live test bench video and stamped serial numbers of the actual motor before dispatch?
A: Absolutely yes. Prior to balance payment and dispatch, we send clear photos and live video of the exact unit assigned to your order. You will see the stamped serial tag, output spline teeth, sealed steel port plates, and the wooden box packaging process.
Q: What happens if the motor crate is damaged during sea freight, and what customs documentation is supplied?
A: Every shipment from Tatan Machinery is protected by full commercial marine cargo insurance. The motor is bolted down directly onto internal skids within a fumigation-free solid plywood crate. We supply commercial invoices with accurate HS Codes (8412.29), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with Komatsu PC35MR-2 Swing Motor:
- DIESEL ENGINE:
Komatsu PC35MR-2 3D88E Diesel Engine Assembly (22F-01-21101)
Remanufactured - MAIN VALVE:
CLSS Main Control Valve Assembly (709-70-51200) for Komatsu PC35MR-2
100% Brand New - HYDRAULIC PUMP:
Main Hydraulic Pump Assembly (708-1S-00021) for Komatsu PC35MR-2
100% Brand New - FINAL DRIVE:
Final Drive Travel Motor (20T-60-71120) for Komatsu PC35MR-2
100% Brand New - BRAND CATALOG:
View All Komatsu Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for PC35MR-2 Swing Motor 708-7S-00130
Looking for direct factory pricing, stock availability, or 12-month warranty terms for Komatsu PC35MR-2 swing motors? Contact senior specialist Gavin now!
💡 Fast Quote: Send your machine serial number or current motor nameplate photos for an accurate match within 10 minutes!
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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