Travel motor reduction 6691497 final drive for Bobcat 335 430 E42 mini excavator
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1. Product Overview
The 6691497 is an integrated propulsion system featuring a variable displacement axial piston motor and a multi-stage planetary reduction gearbox. As the primary drive for the Bobcat 335, 430, and E42 platforms, this unit is calibrated to handle the specific hydraulic flow and weight distribution of these intermediate-sized machines. With 13 years of expertise in hydraulic transmissions, we ensure these drives maintain factory-spec synchronized tracking and maximum torque for climbing and counter-rotation.
2. Comprehensive OEM Part Number Compatibility
This assembly is a direct "bolt-on" replacement for several Bobcat factory part numbers used across the 3.5-ton to 4-ton platforms.
Primary Part Number: 6691497.Alternative/Related Numbers: 6689620, 6681024, 6691498.
Machine Fitment:
300 Series: Bobcat 335.
400 Series: Bobcat 430 (Standard, ZTS, and Fast Track models).
M-Series: Bobcat E42 (Standard and Long Arm configurations).
3. Technical Specifications & Performance
Motor Type: Two-speed variable displacement axial piston motor with integrated high/low speed switching.
Reduction System: Precision-engineered planetary gears made from high-strength, induction-hardened alloy steel.
Max Working Pressure: Rated up to 35.0 MPa (350 bar) to ensure the machine meets original factory tractive effort ratings.
Sealing Technology: Premium "Duo-Cone" (Mirror) mechanical floating seals protect internal gears from mud, standing water, and abrasive debris.
Brake System: Integrated spring-applied, hydraulic-release wet disc parking brake for failsafe operation on slopes.
4. Why Partner With a 13-Year Industry Expert?
Performance Calibration: We understand the subtle differences in hydraulic requirements between a Bobcat 430 and an E42. Our units are calibrated to ensure your machine tracks perfectly straight without "drifting."
Rigorous Load Testing: Every final drive undergoes a 100% bench test. We verify volumetric efficiency, brake holding torque, and smooth 2-speed shifting before the unit is crated.
Factory-Direct Value: Access Original New or Premium OEM units at competitive wholesale prices, providing a high-quality alternative to expensive local dealership markups.
Global Rapid Logistics: Units are secured in reinforced, shock-proof export 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: Final drives are often shipped without gear oil for safety. You must fill the planetary gearbox with the correct volume of SAE 80W-90 gear oil before use.
Case Drain Integrity: Ensure the case drain line is clear and connected to the correct port. High backpressure in the motor case is the leading cause of shaft seal failure and internal motor damage.
System Flushing: If the previous motor failed due to internal breakage, you must flush the hydraulic tank and lines. Residual metal shavings will destroy a new motor almost immediately.
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 trapped air from the hydraulic lines.
6. Ordering & Professional Support
Fitment Verification: Please provide your Machine Serial Number and the number of sprocket mounting holes (commonly 9 or 12) to ensure 100% fitment accuracy.
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, hydraulic pressure settings, and troubleshooting.