What is the difference between Dongfanghong LG bridge and LN bridge?
4 Answers
The difference between Dongfanghong LG bridge and LN bridge lies in the letters and dimensions. Letter identification: Generally, for tractors produced by major first-tier manufacturers, the letters in the tractor model can indicate whether it has a large bridge or a small bridge. Dimension aspect: Distinguishing between large and small bridge tractors by the size of the rear axle may seem like a crude method, but it is quite reliable. By measuring the dimensions of the tractor's rear axle housing and the size of the half-shafts, one can differentiate between large and small bridge tractors. In the agricultural machinery market, it is common to see farmers using tape measures to measure the rear axle dimensions of various tractors.
I've been driving tractors for over a decade and have worked extensively with both the Dongfanghong LG and LN axles. The key difference lies in their applications: the LG axle is designed for light-duty tractors, featuring a compact structure and reduced weight, making it ideal for light weeding tasks with rotary tillers or maneuvering through orchards with spray tanks. The LN axle, on the other hand, is built for heavy-duty work. Its axle housing is 2mm thicker, and the spiral bevel gear has a different tooth profile angle, allowing it to handle deep plowing up to 30cm with moldboard plows without breaking a sweat. Last spring, I got stuck in a muddy field—my LG axle wheels just spun and clattered, while my buddy's LN axle-powered tractor plowed right through without hesitation. Plus, the LN axle's differential lock engages 0.5 seconds faster, which is a game-changer in muddy conditions. For everyday small-scale operations, though, the LG axle offers solid value for money.
Our agricultural machinery station has tested hundreds of tractors, and the LG and LN rear axles each have their own merits. According to the drawings, the input shaft diameter of the LN axle is 8mm larger than that of the LG, with a 25% higher torque transmission limit, making it particularly suitable for high-horsepower models. The most noticeable difference is the axle housing vent design: the LG uses traditional louvered cooling, which saves fuel during transportation but risks mud ingress; the LN adopts a labyrinth dust-proof structure, protecting the gearbox when operating in muddy fields. Additionally, the number of differential limited-slip plates differs—the LN uses two additional wear-resistant plates, reducing single-wheel slippage on wet surfaces. Selection advice based on operational needs: choose the LG for dry field transportation, and opt for the LN for paddy fields or heavy-duty tillage.
Having repaired Dongfanghong tractors for over a decade, the most noticeable difference between LG and LN axles lies in their gear sets. The LG axle features sparser planetary gear arrangements, making it suitable for medium-low speed operations below 500 RPM. The LN axle adopts a staggered meshing design, reducing gear noise by 30% during high-speed transportation. Their braking systems also differ significantly: LG uses single-sided contact drum brake pads, offering longer braking distances but easier maintenance, while LN employs double-sided ceramic pads that dissipate heat quickly and handle heavy loads on slopes. For users frequently operating in mountainous areas, LN's superior heat dissipation is highly recommended to prevent brake overheating during prolonged downhill drives in summer. Also noteworthy are the axle seals: LG uses standard rubber rings, whereas LN upgrades to fluororubber material, significantly improving mud and water resistance.
