Jeil JMV21 travel motor 6659564 final drive for Bobcat 331 C D 334 425 428 mini excavator
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1. Product Overview
The JEIL JMV-21 is an integrated propulsion system consisting of a two-speed axial piston motor and a high-reduction planetary gearbox. As the original equipment (OEM) for several Bobcat series, this unit is specifically calibrated to match the hydraulic flow and pressure of the 331 and 425 platforms. With 13 years of specialized experience in hydraulic transmissions, we ensure these drives deliver the precise torque required for counter-rotation, trenching, and climbing, even in heavy clay or mud conditions.
2. Comprehensive OEM Part Number Compatibility
This assembly is a direct "bolt-on" replacement for the following Bobcat and Jeil part numbers:
Bobcat Part Numbers: 6659564, 6670667, 6677666.
Manufacturer Model: JEIL JMV-21 (JMV21/11).
Machine Fitment:
300 Series: Bobcat 331 (C, D, and G series), 334.
400 Series: Bobcat 425, 428 (Zero Tail Swing models).
Compatible Variants: Standard Track, Long Track, and Extendable Arm configurations.
3. Technical Specifications & Performance
Motor Type: Variable displacement axial piston motor with integrated 2-speed travel switching (High/Low).
Gearbox Architecture: Multi-stage planetary reduction gears manufactured from hardened alloy steel for maximum service life.
Max Working Pressure: Rated for continuous operation at 30.0 - 35.0 MPa to ensure factory-spec tractive effort.
Sealing: Premium "Duo-Cone" mechanical floating seals designed to protect internal gears from water, mud, and abrasive debris.
Brake System: Integrated spring-applied, hydraulic-release wet disc parking brake for secure operation on inclines.
4. Why Partner With a 13-Year Industry Expert?
JEIL OEM Authenticity: We provide the genuine JMV-21 series motor, ensuring the internal valve plates and piston sets match the original Bobcat hydraulic curve.
Rigorous Bench Testing: Every unit undergoes a 100% load test on a hydraulic bench. We verify volumetric efficiency, brake holding torque, and high/low speed transition before shipment.
Factory-Direct Value: Benefit from our established supply chain to access Original New units at competitive wholesale prices, avoiding the high markups of local dealerships.
Global Rapid Logistics: Units are secured in reinforced, shock-proof export crates. Rapid delivery via DHL, FedEx, or UPS typically arrives in 3 to 7 business days.
5. Critical Installation & Maintenance Protocol
Gear Oil Commissioning: Final drives are often shipped without gear oil for safety. You must fill the planetary gearbox with SAE 80W-90 gear oil to the correct level before operation.
Case Drain Connection: Verify that 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 hydraulic tank and lines. Residual metal shavings are the primary cause of premature failure in new units.
Air Bleeding: After installation, lift the track off the ground and run the motor at low speed in both directions for several minutes to remove air from the hydraulic lines.
6. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number and the number of sprocket mounting holes (commonly 9 or 12).
Instant Quote: Contact us today for up-to-date pricing, tiered quality options, and current stock availability.
Technical Guidance: Our expert team is available 24/7 to assist with installation procedures, pressure settings, and troubleshooting.