Rear Gear Case Bevel Gear Assy

🔧 CFMoto Rear Gear Case Bevel Gear Assembly

📦 Part Number: Q860-3300B0

⚙️ Rear Gear Case Bevel Gear Assy · Final Drive Gear · OEM Spec

📍 Installation Location: Rear axle / Inside final drive (differential)

✅ Single unit · Precision alloy steel · Direct fit · Compatible with multiple CFMoto ATV models

This is a CFMoto OEM-spec Rear Gear Case Bevel Gear Assembly, part number Q860-3300B0, sold as a single unit. This bevel gear assembly is the core component of the rear axle final drive, consisting of a precision-matched pinion gear (drive pinion) and ring gear (crown wheel). Installed inside the rear axle differential, it changes the direction of power transmission by 90°, reduces speed and multiplies torque to drive the rear wheels — a critical drivetrain component that determines vehicle power delivery and performance.

Over time, the original bevel gear assembly may suffer from tooth wear, pitting, chipping, broken teeth, or bearing damage under high loads, high torque, and rough terrain — leading to noise, vibration, reduced transmission efficiency, or even rear axle failure. Replacing with an OEM-spec bevel gear assembly is essential to restore rear axle driveline precision and reliability.

• ✅ OEM Original Spec: Manufactured to CFMoto original technical standards; tooth profile, heat treatment, and mounting dimensions match the genuine part exactly.
• 🛡️ Precision Alloy Steel: Made from premium alloy steel with carburizing and hardening heat treatment for excellent wear resistance, pitting resistance, and fatigue strength.
• 🔧 Precision Matched: Pinion and ring gear are precision-lapped as a matched set for correct tooth contact pattern and backlash.
• 💪 Efficient Power Transfer: Precision tooth design ensures smooth, efficient, and quiet power transmission.
• 🔄 Direct Replacement: Replaces worn, pitted, chipped, or damaged original bevel gear assemblies.

✅ Typical signs you need to replace the Rear Gear Case Bevel Gear Assembly:
• Unusual noise from the rear axle (gear whine, howling, or periodic knocking).
• Noticeable vibration or jerking from the rear axle during acceleration or deceleration.
• Metal particles or iron filings found in the rear axle lubricant during oil change.
• Visible tooth wear, pitting, spalling, or broken teeth (visual inspection).
• Excessive or insufficient rear axle backlash, affecting driving smoothness.
If any of these occur, inspect and replace the bevel gear assembly promptly to prevent further rear axle damage.

✅ Installation Tips:
1. Confirm the assembly is the correct Q860-3300B0 matching the original.
2. Raise the vehicle with proper support and remove the rear axle assembly.
3. Disassemble the differential and remove the old pinion and ring gear.
4. Clean the differential housing and bearing bores, inspecting bearing condition (replace if necessary).
5. Install the new bevel gear assembly, paying attention to the match marks on the pinion and ring gear.
6. Adjust gear backlash and tooth contact pattern (requires special tools and marking compound).
7. Torque bearing caps and differential housing bolts to OEM specifications.
8. Fill with the specified rear axle gear oil type and capacity.
9. Perform a road test to confirm no noise or abnormal vibration from the rear axle.
Installation involves precision gear adjustment — requires special tools and expertise. Professional installation is strongly recommended.

⚠️ Important Note: This product is a CFMoto Rear Gear Case Bevel Gear Assembly, part number Q860-3300B0, sold as a single unit (includes matched pinion and ring gear). Fits the listed CFMoto ATV models. Slight variations may occur between production batches. If your specific model is not listed, please contact us with your VIN to confirm compatibility. Images are for reference only; actual product may vary. Rear axle gear installation involves precision adjustments — always follow the backlash and contact pattern specifications in your vehicle's service manual.