- ChangChun City, Jilin Province, China
by 
As a supplier of FAW Truck parts in China, the following is a comprehensive analysis article on FAW Truck gearboxes, covering the main models, technical features, advantages and disadvantages, and recommended spare parts for daily maintenance for your reference:
CA12TAX21OM3 Series
– Technical Parameters: As the main transmission model of FAW Heavy Duty Trucks, it supports 12-speed manual operation, adapts to high-torque engines, and is widely used in tractor, dump truck and other scenarios. Its speed ratio design covers a wide range, including direct gear (1:1), over speed gear (0.75:1 or 0.8:1), medium speed ratio (e.g. 4.11:1, 5.44:1) and low-speed gear (7.42:1, 9.84:1), which can meet the power demand under different working conditions.
– Applicable models: mainly equipped with FAW Jiefang J6, J7 and other heavy truck models.
2. Other common models
– ZF 16-speed transmission (cooperative model): adopts double intermediate shaft design, supports 16 gears operation, suitable for long-distance transportation and other high-load scenarios, and needs to be equipped with special tools (e.g., high and low gear fork shaft fixing tool, main and secondary axle mounting jigs) to carry out maintenance.
Advantages
–Reliable structure: mainly manual transmission (MT), simple structure, low maintenance cost, high transmission efficiency (up to 98% or more), suitable for heavy-duty transportation.
– Strong load-carrying capacity: low-speed gear design (e.g. 9.84:1) provides strong torque output and adapts to complex road conditions.
– High economy: manual gearbox fuel consumption performance is better than automatic gearbox, and the long-term use cost is lower.
Key maintenance spare parts
– Gear sets: including main and secondary shaft gears, synchronizer gears, need to match the original specifications to ensure the meshing accuracy.
– Bearing: such as NU309NRB, RNU308E and other models, need to be checked regularly for wear.
– Seals: output shaft oil seals, input shaft bearing seals to prevent oil leakage and impurity intrusion.
– Clutch plate: easy to wear under high load conditions, it is recommended to check and replace every 100,000 kilometers.
Maintenance Consumables
– Transmission oil: GL-5 gear oil is recommended, manual transmission is recommended to be replaced every 100,000 kilometers, automatic or dual-clutch models shortened to 60,000-80,000 kilometers.
– Filter: Replace the transmission oil filter element regularly to prevent clogging of the oil circuit.
– Grease: For transmission shaft cross shaft and other parts, No.2 lithium grease is recommended in winter and No.3 in summer.
Specialized tools supporting
– Dismantling tools: such as subcase output shaft flange nut socket (SW70/54), intermediate shaft bearing extractor, to enhance the maintenance efficiency.
– Installation tools: such as spindle holder, sub box lifting plate, to ensure that the disassembly and installation process is in accordance with the technical specifications.
1. Regular Inspection Items
– Oil condition: Check the transmission oil level and color every month, and find turbidity or metal shavings need to be serviced immediately.
– Transaxle dynamic balance: check every 50,000 kilometers to avoid shaking and rattling.
2. Supplier service optimization
– Spare parts combination package: “Gear+Bearing+Seal” package is introduced to reduce the procurement complexity of users.
– Technical training support: joint with FAW to carry out training on the use of maintenance tools to enhance the professional ability of after-sales outlets.
With its high reliability and economy, FAW truck transmission occupies an important position in the heavy truck market. As a supplier, providing precisely adapted spare parts and professional maintenance programs will help customers extend transmission life and reduce operating costs. It is recommended to dynamically adjust the spare parts inventory and service strategy in accordance with FAW’s official technical manuals and customers’ actual working conditions, in order to respond to diversified market demands.
FAW is one of China’s oldest and largest automotive manufacturers, with registered capital of RMB 35.4 billion yuan and total assets of RMB 457.83 billion yuan.
CHINA FAW GROUP CO., LTD. (short for FAW), formerly China First Automobile Works, can trace its roots back to Jul 15, 1953, when its first assembly plant started to be constructed. FAW is one of China’s oldest and largest automotive manufacturers, with registered capital of RMB 35.4 billion yuan and total assets of RMB 457.83 billion yuan.
China heavy truck sales global “five in a row”, heavy truck sales global “six in a row”, tractor sales for 16 consecutive years absolute leading industry.
