Description
HMS072 9177550 Swing Motor Assembly Overview
The HMS072 9177550 Swing Motor assembly manufactured by Tatan is an integrated dual-axial piston hydraulic drive with heavy-duty multi-stage planetary reduction gearing belonging to our Swing Motor Assembly classification. Engineered specifically for Hitachi ZX120, ZX120-1, ZX120-3, and ZX135US 12-ton crawler excavators, replacing your worn swing drive with a Tatan complete assembly eliminates superstructure drifting on slopes, prevents sudden hydraulic stopping shocks, and cures internal casing bypass across demanding civil excavation applications.
Operating under direct pressure flow from the machine’s main hydraulic pump and routed through the main control valve assembly, this swing device incorporates carburized alloy sun and planet gears, a hydraulic-release parking brake pack, and dual anti-rebound cushion valves, ensuring 100% direct bolt-on installation with turntable frames and chassis pilot lines.
Key Attributes & Technical Parameters for HMS072 9177550 Swing Motor
| Product Category | Swing Motor Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Hitachi / Kayaba HMS072 / HMS072AG-2UA | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX120 | ZX120-1 | ZX120-3 | ZX135US | OEM Part Number | 9177550 / 9196961 / 9188270 |
| Matched Engine Series | Isuzu 4BG1T / 4JJ1X Diesel Engine (72 kW) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 29.4 MPa (294 bar / 4264 PSI Cushion Relief) | Brake Release Pressure | 3.9 MPa (39 bar Pilot Hydraulic Line) |
| Spool Precision Spec | Micro-Lapped Valve Plate < 0.003 mm | Quality Status | 100% Brand New Motor & Gearbox Unit |
| Machinery Test Report | Provided (100% Bench Holding Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Gear Oil Spec | SAE 80W-90 / SAE 85W-140 EP | Packaging | Export Wooden Box Packaging |
Excavator Hydraulic Drives & Swing Machinery Inventory
Tatan maintains extensive factory inventory of complete integrated swing devices, planetary reduction gearboxes, hydraulic piston motors, and replacement internal rotating groups for earthmoving machinery:
Supported Excavator Machinery Brands & Swing Drive Lineup
In addition to Hitachi crawler excavators, Tatan manufactures and supplies replacement swing hydraulic motors, planetary reduction gears, and slewing rings across global equipment brands:
Application Scenarios & Buyer Value
When replacing your 12-ton excavator slewing unit with our HMS072 9177550 Swing Motor, machine operators and fleet managers secure measurable field reliability:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX120 Motor Replacement | 1:1 direct bolt-on installation eliminates carriage creep on side slopes and restores sharp boom swing acceleration. |
| Heavy Equipment Repair Workshops | Avoids the complex labor of shimming internal brake friction discs; installs as a factory-tested complete reduction unit. |
| Quarry & Civil Earthmoving Fleets | Built-in anti-reaction cushion valves protect swing gearbox teeth from fatigue fracture during rapid back-and-forth trench backfilling. |
| Machinery Parts Stockists | High-demand 12-ton swing motor inventory packaged in solid export wooden crates ready for immediate global dispatch. |
HMS072 9177550 Swing Motor Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common swing motor and reduction gearbox symptoms on Hitachi ZX120 series crawler excavators:
| Hydraulic Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Superstructure creeps or drifts when parked on side incline | Mechanical parking brake friction discs glazed or brake release piston seal leaking pilot fluid into casing. | Replace with Tatan 9177550 complete swing motor assembly fitted with factory pre-seated wet multi-disc brake pack. |
| 2. Violent shudder / clunking when releasing swing joystick | Anti-reaction check valve poppet contamination or cushion relief valve spring fatigue failing to absorb 12-ton inertia rebound. | Clean relief valve cartridges, reset 29.4 MPa relief pressure, or install new Tatan pre-calibrated swing drive assembly. |
| 3. Weak slewing acceleration and motor casing temperature > 80°C | Micro-scoring across bronze valve plate and cylinder barrel face allowing high-pressure fluid to bypass into case drain. | Install Tatan new swing motor with micro-lapped bimetal valve plates (< 0.003 mm tolerance); flush hydraulic lines. |
| 4. Gear oil leaking downward into swing bearing grease tub | Lower output shaft mechanical face seal or radial lip seal failure caused by dirt ingress or wire wrapping around pinion. | Replace complete reduction unit to prevent dry friction wear and tooth fracture in the planetary gear carrier. |
Transport Packaging & Certified Quality Assurance
Precision hydraulic motors and gearboxes require absolute shock protection. Every Tatan unit is sealed and packaged in solid export timber crates:
✈️ Express Air Courier
Partnered with DHL, FedEx, and UPS for 3-7 day priority delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL container ocean freight for bulk equipment parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
HMS072 9177550 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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