Circular gear 23B-15-12270

Core Features

Reduced speed and increased torque: The transmission ratio is approximately 5.83 (commonly matched with a 12T drive gear and a 68T driven gear), amplifying engine power 5–6 times to meet the traction requirements of 18–22 t machines.

Power steering: Enables 90° power steering, converting horizontal power from the driveshaft to vertical power from the half-shaft, driving the wheels.

Heavy load capacity: Withstands radial loads ≥120 kN and axial loads ≥50 kN, suitable for uneven construction sites and the impact loads of heavy-duty operations.

Smooth transmission: Helical tooth profile design with a contact ratio ≥1.8, allowing multiple teeth to mesh simultaneously, reducing transmission shock and noise, and improving operating comfort.

Product superiority

1. Advantages of Materials and Manufacturing Processes

High-strength alloy material: Forged from 20CrMnTiH carburized steel, carburized and quenched + low-temperature tempered, tooth surface hardness HRC58–62, tooth core hardness HRC30–35, tensile strength ≥1200 MPa, resistant to bending, pitting, and galling.

Precision tooth profile machining: Five-axis linkage gear grinding, tooth profile accuracy GB/T 10095 Grade 6, tooth surface roughness Ra≤0.8 μm, meshing clearance 0.15–0.25 mm, contact spot ≥70%.

Fatigue-resistant design: Tooth root fillet roll forming strengthens the gear, reducing stress concentration coefficient by 30% and increasing fatigue life by 50%; tooth direction drum-shaped trim reduces edge contact, adapting to variable load conditions.

Original factory fit: Hub stop, bolt holes, and differential housing precisely match, requiring no modification during installation, coaxiality ≤0.03 mm, ensuring transmission accuracy.

1. Performance and Maintenance Advantages

Low noise and low vibration: Smooth helical gear meshing, transmission noise ≤82 dB, 8–10 dB lower than spur bevel gears.

Long life design: Carburized layer depth 1.2–1.5 mm, wear-resistant and impact-resistant, design life ≥12,000 working hours, 40% longer than ordinary gears.

Maintenance-friendly: Supplied in pairs with the drive gear, no additional lamination required after installation, shortening replacement time; precise positioning of hub bolt holes ensures high assembly efficiency.

Safety redundancy: Tooth root thickness ≥12 mm, uniform hardened tooth surface, single tooth fracture risk ≤0.1%/1000 hours, avoiding sudden failure.

Installation and Maintenance Recommendations

1. Installation Points

Cleaning and Inspection: Clean the gear surface and mounting surface, checking for cracks, pitting, and peeling on the tooth surface, and ensuring the hub stop is undamaged.

Matching and Installation: Replace with the original factory-matched drive gear to ensure meshing parameters match; tighten bolts diagonally to a torque of 280–320 N·m.

Clearance Adjustment: Control the meshing clearance to 0.15–0.25 mm using adjusting shims, ensuring the contact patch is ≥70% along the tooth length and ≥60% along the tooth height, biased towards the middle of the tooth root.

Lubrication Specifications: Add 85W-140 heavy-duty gear oil to the lower edge of the oil level hole to prevent poor lubrication and subsequent tooth surface wear.

2.Maintenance

Routine Inspection: Check the drive axle oil temperature (≤100℃) and for any abnormal noises or leaks every shift. Abnormal oil temperature requires investigation of gear meshing or lubrication issues.

Regular Oil Change: Change the gear oil every 2000 hours. Clean the magnetic drain plug, remove metal shavings, and monitor gear wear.

Replacement Cycle: Recommended every 12000 hours or 3 years (whichever comes first). Replace immediately if tooth surface wear ≥0.4 mm, pitting area ≥15%, or broken teeth are observed.

Troubleshooting: For abnormal meshing noises, first check the clearance and contact spots. Readjust or replace the gear assembly if necessary.

Summarize

Made of high-quality alloy material, precision machining and original equipment manufacturer (OEM) compatibility, 23B-15-12270 provides efficient and stable reduction and torque boosting and power steering for many models of Komatsu graders. It is suitable for heavy loads and complex working conditions, reduces failure and maintenance costs, and is a core component of the drive axle transmission system.