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This premium Sinotruk HOWO Input Shaft and First Shaft Gear Assembly (Part No. AZ220302023) is specifically engineered for high-horsepower models including the HOWO T7H, Sitrak C7H, and Hohan series. Featuring the advanced High-Profile Fine Teeth design, this assembly offers increased tooth contact area, resulting in smoother power transmission and higher load-bearing capacity compared to standard gears.
Technical Specifications:
Part Name: Input Shaft and First Shaft Gear Assembly
Part Number: AZ220302023
Teeth Profile: High-Profile Fine Teeth (Optimized for Heavy-Duty Torque)
Transmission Compatibility: HW19712, HW25712, and HW series gearboxes.
Material: Premium 20CrMnTi Alloy Steel
Heat Treatment: Carburizing and Quenching (Surface Hardness HRC58-62)
Manufacturing Process: Precision Forging and CNC Gear Grinding
Key Advantages:
Reduced Noise: The fine-teeth geometry minimizes vibration during high-speed operation.
Extended Lifespan: Enhanced surface treatment prevents pitting and tooth breakage.
Perfect Fit: 100% Genuine OEM dimensions for hassle-free replacement.
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To ensure optimal performance of your Sinotruk howo parts, please adhere to the following installation guidelines:
Compatibility Verification: Ensure the gearbox model matches the "Fine Teeth" specification. Do not mix fine-teeth shafts with standard-teeth countershaft gears.
Lubrication: Pre-lubricate the splines and gear teeth with heavy-duty transmission oil (API GL-5 grade recommended) before installation.
Bearing Inspection: Always inspect or replace the input shaft pilot bearing and main shaft bearings to prevent axial play.
Seal Integrity: Replace the front oil seal during assembly to prevent gearbox fluid leakage.
Alignment: Use a professional alignment tool to ensure the input shaft is perfectly centered with the clutch pressure plate and flywheel.
