191-3237 final drive for Caterpillar 320C 320CL excavator
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Final Drive Travel Motor for CAT 320C 320CL Excavator | OEM Replacement Assembly
1. Product Overview
The travel motor and final drive assembly is the critical transmission component that enables the CAT 320C/320CL to maneuver in demanding environments. This unit integrates a high-pressure axial piston motor with a multi-stage planetary reduction gearbox. With 13 years of expertise in heavy hydraulic systems, we provide units engineered to handle the 20-ton class machine's rigorous torque requirements, ensuring synchronized tracking and powerful climbing ability.
2. Comprehensive OEM Part Number Compatibility
This assembly is a direct replacement for the following Caterpillar factory part numbers used across various 320C sub-models and regional configurations:
Primary Motor & Drive Group: 191-3237, 148-4696, 135-6214, 232-3550, 107-7028, 134-7132, 216-0044.
Alternative/Superseded Numbers: 148-4695, 227-6949, 114-1488.
Machine Fitment:
Caterpillar 320C (Standard Track)
Caterpillar 320CL (Long Undercarriage)
Caterpillar 320C LRR (Log Loader / RR models)
3. Technical Specifications & Performance
Motor Type: Two-speed variable displacement axial piston motor.
Gearbox Architecture: Three-stage planetary reduction gears made from high-strength, heat-treated alloy steel for maximum fatigue resistance.
Dynamic Braking: Integrated wet-disc parking brake with automatic hydraulic release.
Sealing Technology: Heavy-duty "Mirror Seals" (Floating Seals) designed to operate in extreme mud, water, and abrasive soil.
Max Working Pressure: Rated up to 350 bar (35 MPa) to meet factory tracking force specifications.
4. Why Partner With a 13-Year Industry Expert?
Exact Ratio Matching: We ensure the planetary gear ratio perfectly matches the CAT 320C's specific sub-model to prevent "tracking pull" (the machine veering to one side).
Rigorous Load Testing: Every unit undergoes a high-pressure stall test and a multi-speed rotation test to verify volumetric efficiency and seal integrity.
Factory-Direct Value: Access Original New or Premium OEM units at competitive wholesale prices, bypassing the high markups of local dealerships.
Global Rapid Logistics: Units are secured in reinforced, export-grade wooden crates. Rapid delivery via DHL, FedEx, or UPS typically arrives in 3 to 7 business days.
5. Critical Installation & Maintenance Protocol
Gear Oil Commissioning (Crucial): Final drives are often shipped without oil or with "storage oil" only. You must fill the planetary side with the correct volume of SAE 90 or 80W-140 gear oil before use.
Case Drain Verification: Before startup, ensure the case drain line is clear and connected to the center port. Obstructions in this line will cause the motor shaft seal to blow out immediately.
Hydraulic System Flushing: If the previous motor failed due to internal breakage, you must flush the entire hydraulic circuit. Residual metal shavings are the #1 cause of premature failure in new units.
Bleeding Trapped Air: After installation, lift the track off the ground and run the motor at idle speed in both directions for several minutes to remove air from the hydraulic lines.
6. Ordering & Professional Support
Fitment Verification: Because the 320C has multiple undercarriage variations, please provide your Machine Serial Number (e.g., Prefix ANB, BER, or PAB) and the number of sprocket mounting bolts (standard is 21 or 24 holes).
Instant Quote: Contact us today for current pricing, availability, and tiered quality options.
Technical Guidance: Our expert team is available 24/7 to assist with installation procedures, pressure setting adjustments, and hydraulic troubleshooting.