Bulldozer Rocker Arm Assembly 5374109 Is Used As An Accessory For Cummins Engines

The rocker arm body is precision-forged from SAE 8620 alloy steel, carburised and quenched (surface hardness HRC 58-62, core toughness HRC 30-35), and coated with a diamond-like (DLC) coating (friction coefficient ≤ 0.08). This enhances its wear resistance by 5 times compared with ordinary cast steel, and it enables the dozer to perform high-frequency impacts at a rate of 1500 times per minute.

The roller bearings are made of a ceramic-steel composite material, with a temperature resistance of up to 300°C and a grease retention period extended to 2000 hours (3 times longer than the life of traditional copper bushings).

With a built-in miniature oil channel (aperture Φ1.2±0.05mm), it realizes the dual mode of pressure lubrication and splash lubrication. The oil flow rate is increased to 4.8L/min (@300kPa), and the temperature rise of key friction parts is reduced by 40°C.

With surface anodic oxidation treatment (film thickness of 25μm), it has a salt spray corrosion resistance of 2500 hours (in accordance with ASTM B117 standard), enabling it to adapt to mines, harbours, and other high-dust, high-salt spray environments.

Mining bulldozer: adapted to Komatsu D475A-5 bulldozer QSK60 engine, the valve transmission efficiency stays above 98.5% under 35° slope and rock impact load.

Port loading: matched with Liebherr PR 776 bulldozer QSK38 engine, the valve lash change is ≤0.03mm for 24 hours of continuous operation, and the adjustment-free cycle is extended to 5000 hours.

Polar construction: used in Caterpillar D9T Polar Edition bulldozer, a complete lubricant film is established within 30 seconds after -50°C low temperature start-up.

Fuel Economy: Precise air distribution reduces pumping gas loss, improving the comprehensive fuel efficiency by 1.2%. As a result, the average annual fuel-saving cost of a single unit is about 36,000 yuan (calculated based on 6,000 hours of operation per year).

Intelligent pre-diagnosis: optional vibration sensor (4-20mA output), data transmitted directly to the Cummins VIMS system, real-time monitoring of the energy spectrum of the rocker arm impact, early warning code SPN 3714-22 (transmission abnormality) accuracy ≥ 99%.