Gear-711-61-12120

Core Features

Precise Power Transmission: Power is efficiently transmitted from the input shaft to the output shaft through gear meshing, achieving a transmission efficiency of ≥98% and ensuring zero torque loss.

Speed Variables and Torque Amplification: A fixed transmission ratio (commonly i=2.5–4.0) is formed with the mating gears, adapting to the speed/torque requirements of the grader during travel and operation.

Stable Load Bearing: Withstands combined radial and axial loads, resists impact and fatigue, and is suitable for heavy-duty operations (total machine operating weight approximately 18–22 t).

Low-Noise and Smooth Transmission: High overlap of helical gear meshing reduces transmission noise (≤85 dB), minimizes vibration, and improves operator comfort.

Product Superiority

1. Material and Manufacturing Advantages

High-strength alloy material: Made of SCM420H chromium-molybdenum alloy steel, forged → carburized and quenched → low-temperature tempered, with a tooth surface hardness of HRC58–62 and a core hardness of HRC30–35, balancing surface wear resistance and core toughness, providing impact and pitting resistance.

Precision manufacturing process: Grinding accuracy reaches ISO 6 grade, tooth direction/tooth profile tolerance ≤0.012 mm, helix angle error ≤±0.05°, ensuring smooth meshing and low noise.

Original factory precise fit: Dimensions perfectly match keyways, stops, and center distances, requiring no modification during installation. Coaxiality ≤0.02 mm, avoiding uneven loading and abnormal wear.

All-condition compatibility: Suitable for oil temperatures -30~+100℃, input torque ≤3500 N・m, and speed ≤3000 rpm, with anti-galling, fatigue resistance, and a service life ≥12000 hours.

2.Performance and Maintenance Advantages

High transmission efficiency: Helical gear structure has a meshing efficiency of ≥98%, reducing energy consumption by 3%–5% compared to spur gears, resulting in better fuel economy.

Strong load-bearing capacity: Tooth surface contact stress ≤1200 MPa, bending strength ≥800 MPa, suitable for heavy-load and impact conditions, failure rate ≤0.5%/1000 hours.

Low maintenance cost: Original factory quality assurance, 12-month/2000-hour warranty, reducing downtime for maintenance and lowering overall costs.

Installation and maintenance recommendations

1.Installation Points

Cleaning and Inspection: Clean the gear surface and mounting shaft, checking for any dents or burrs on the tooth surfaces. The keyway and key clearance should be 0.01–0.03 mm.

Hot Fitting Specifications: Heat to 80–100℃ before hot fitting, avoiding forceful hammering. After installation, check for end face runout ≤0.02 mm and radial runout ≤0.015 mm.

Meshing Adjustment: Control the backlash of mating gears to 0.15–0.25 mm. The contact pattern should be ≥60% of the tooth height and ≥70% of the tooth length, ensuring uniform load distribution.

Proper Lubrication: After assembly, add GL-5 85W-140 gear oil to ensure sufficient lubrication of the tooth surfaces and avoid dry friction.

2.Maintenance

Routine Inspection: Check the transmission system for abnormal noises, oil temperature, and oil level every shift. Stop the machine immediately if any abnormalities are found.

Regular Replacement: It is recommended to replace the gear every 12,000 hours or 2 years (whichever comes first) as preventative maintenance. When replacing, simultaneously check the mating gears, bearings, and oil seals.

Troubleshooting: If gear pitting, broken teeth, or abnormal noise are observed, prioritize replacing the original factory gear. Check the installation accuracy and lubrication system. Repair or replace related components if necessary.

Summarize

The 711-61-12120 delivers efficient and stable power transmission for GD555/GD655 graders through high-strength alloy, precision manufacturing, and OEM compatibility. With its high load capacity, low noise, and long service life, it reduces maintenance frequency and costs, making it the preferred transmission component to ensure overall machine efficiency.