Description
MSG-44P 148-4738 Swing Motor Assembly Overview
The MSG-44P 148-4738 Swing Motor assembly manufactured by Tatan is an integrated heavy-duty axial piston hydraulic drive with planetary reduction gearing belonging to our Swing Motor Assembly classification. Engineered specifically for Caterpillar CAT 307, 307B, 307C, and 307D 7-to-8-ton 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 construction applications.
Operating under direct pressure flow from the machine’s AP2D36 hydraulic pump and routed through the KMX13 main control valve, this MSG-44P 148-4738 Swing Motor incorporates carburized alloy sun and planet gears, an output pinion shaft, 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 MSG-44P 148-4738 Swing Motor
| Product Category | Swing Motor Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | KYB MSG-44P / MSG-44P-21 Motor + Planetary Gearbox | Brand Name | Tatan |
| Compatible Equipment | Caterpillar CAT 307 | 307B | 307C | 307D | OEM Part Number | 148-4738 / 185-0360 / 312-6318 |
| Matched Engine Series | Mitsubishi 4M40 / 4D34 Diesel Engine (43.0 kW) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 20.6 MPa (206 bar / 2987 PSI Cushion Relief Circuit) | 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 |
Comprehensive Excavator Hydraulic Drive & Valve Lineup
Tatan maintains extensive factory inventory of complete multi-spool control valves, main pumps, travel motors, swing gearboxes, and internal seal kits across global excavator lines:
Supported Excavator Machinery Brands & Swing Drive Lineup
In addition to Caterpillar compact excavators, Tatan manufactures and supplies replacement swing hydraulic motors, planetary reduction gears, and slewing rings across global equipment brands:
Application Scenarios & Buyer Value
When contractors search to compare Caterpillar 307 swing motor replacement cost and upgrade their machine with our MSG-44P 148-4738 Swing Motor, they secure measurable field reliability and lower maintenance overhead:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| CAT 307 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 7-to-8-ton swing motor inventory packaged in solid export wooden crates ready for immediate global air or ocean dispatch. |
MSG-44P 148-4738 Swing Motor Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common swing motor and reduction gearbox symptoms on Caterpillar 307 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 complete MSG-44P 148-4738 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 7-ton inertia rebound. | Clean relief valve cartridges, reset 20.6 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.
MSG-44P 148-4738 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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