Description
HMT36 9180731 Travel Motor Assembly Overview
The HMT36 9180731 Travel Motor assembly manufactured by Tatan is a heavy-duty integrated hydraulic final drive unit combining a dual-speed axial piston motor and planetary reduction gearbox. Belongs to our Travel Motor Final Drive Assembly classification. Engineered specifically for Hitachi ZX120, ZX120-1, ZX120-3, and ZX125US 12-ton crawler excavators, replacing your worn final drive with a Tatan complete assembly eliminates single-side track steering deviation, restores crawling gradeability on muddy inclines, and cures planetary gear grinding across demanding utility trenching and quarry applications.
Driven directly by the machine’s HPK055 hydraulic pump and routed through the main control valve assembly, this HMT36 9180731 Travel Motor incorporates 20CrNiMo carburized planetary gears, Duo-Cone mechanical face seals, a hydraulic parking brake pack, and a built-in counterbalance valve, ensuring 100% direct bolt-on installation with track frames, drive sprockets, and chassis hydraulic lines.
Key Attributes & Technical Parameters for HMT36 9180731 Travel Motor
| Product Category | Travel Motor Final Drive Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Hitachi HMT36 / TM18 Dual-Speed Motor + Gearbox | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX120 | ZX120-1 | ZX120-3 | ZX125US | OEM Part Number | 9180731 / 9181123 / 9180429 |
| Matched Engine Series | Isuzu 4BG1T / 4JJ1X Diesel Engine (66 – 72 kW) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 34.3 MPa (343 bar / 4975 PSI Travel Circuit) | Pilot Shift Pressure | 3.9 MPa (39 bar Shift Line) |
| Spool Precision Spec | Micro-Lapped < 0.003 mm Clearance | Quality Status | 100% Brand New Motor & Gearbox Unit |
| Machinery Test Report | Provided (100% Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Gear Oil Spec | SAE 80W-90 / SAE 85W-140 EP | Packaging | Export Wooden Box Packaging |
Excavator Final Drive & Undercarriage Drive Assembly Lineup
Tatan supplies factory-built turnkey planetary final drives, track motors, hydraulic travel reduction gearboxes, and Duo-Cone replacement seal groups across global machinery brands:
Supported Excavator Machinery Brands & Final Drive Lineup
In addition to Hitachi crawler excavators, Tatan manufactures and supplies replacement travel motors, planetary gearboxes, and track drive components across global equipment brands:
Application Scenarios & Buyer Value
When contractors search to compare Hitachi ZX120 final drive replacement cost and upgrade their undercarriage with our HMT36 9180731 Travel Motor, they achieve direct machine uptime and lower cost per hour:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX120 Drive Replacement | 1:1 direct bolt-on installation eliminates track wandering on muddy terrain and restores full 5.5 km/h high-gear travel speed. |
| Heavy Equipment Repair Workshops | Avoids the complex labor of pressing planetary gear carriers and setting bearing preload shims; drops on as a pre-tested sealed unit. |
| Quarry & Heavy Earthmoving Fleets | Carburized planetary gears and heavy Duo-Cone mechanical face seals withstand continuous mud immersion and rocky trail crawling. |
| Machinery Parts Stockists | High-demand 12-ton final drive inventory packaged in solid export wooden crates ready for immediate global air or sea dispatch. |
HMT36 9180731 Travel Motor Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common final drive and planetary reduction gearbox issues on Hitachi ZX120 series excavators:
| Hydraulic Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Track pulling to one side during straight crawling | Travel motor valve plate scoring causing excessive case-drain bypass, or counterbalance spool sticking partially closed on weak side. | Replace with Tatan complete HMT36 9180731 Travel Motor assembly or flush counterbalance valve pilot galleries. |
| 2. Motor fails to shift between Low (Tortoise) and High (Hare) speed | Two-speed shift pilot spool jammed by oil contamination, or swashplate minimum angle control piston seals degraded. | Inspect 3.9 MPa shift pilot pressure at motor port, clean 2-speed selector valve, or replace travel drive unit. |
| 3. Black gear oil leaking from sprocket hub into track chains | Duo-Cone mechanical face floating seal rings worn out or wire/packing rope wrapped around sprocket cutting O-rings. | Stop machine immediately to prevent planetary gear seizure; install fresh Tatan factory-sealed final drive. |
| 4. Loud grinding & clunking sound from track drive hub | Planetary sun gear tooth fracture or needle roller bearing failure caused by operating with low gear oil level. | Drain gear oil to check for metal debris; replace complete gearbox assembly to prevent main track frame lockup. |
Transport Packaging & Certified Quality Assurance
Heavy-duty undercarriage drives require absolute vibration and contamination protection. Every unit is bolted 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.
HMT36 9180731 Travel Motor FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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