4275261440 Original Loader Transmission Shaft for ZW310-5A

The original transmission shaft part number 4275261440 is the power transmission core component provided by Hitachi Construction Machinery for the ZW310-5A wheel loader (with a total working mass of 22.4-22.9 tons and a wheelbase of 3450mm). This transmission shaft is mainly used to transfer the output torque of the gearbox to the drive axle, achieving power distribution between the front and rear axles. Its common models may include Hitachi loaders of the ZW310-6 and ZW330-5A series, as well as similar tonnage models such as ZW250 and ZW350. As an integrated design from the original factory, it is deeply matched with the vehicle transmission system, and the use of non-standard spare parts is strictly prohibited to ensure transmission efficiency and reliability.

This product is an original transmission shaft assembly, which adopts high-strength alloy steel shaft tube, cross axis universal joint and spline expansion sleeve structure. Main technical parameters: rated working torque ≥ 500N · m, guaranteed load>1000N · m; Rated speed range 1800-3500r/min; The swivel angle of the universal joint is ≥ 25 °, and the expansion and contraction of the spline is ± 25mm. The dynamic balance follows the G40 standard, with an unbalance of ≤ 20g · cm at each end, and the remaining unbalance after flattening is ≤ 30g · cm. The interface adopts standard flange fork connection (phase difference ≤ 2.5 °), equipped with grease fittings for regular lubrication. This transmission shaft complies with the QC/T29082 industry standard and is suitable for harsh working conditions such as high load, frequent start stop, and multi turn of loaders.

Inspection cycle: It is recommended to check the wear of the universal joint cross shaft, the looseness of the spline expansion sleeve, and the tightening torque of the bolts every 500 working hours; Perform dynamic balance testing every 1000 working hours. Lubrication specification: Add lithium based grease through the grease nozzle every 250 working hours (until the old grease is squeezed out). Installation points: 1 Ensure that the phase of the flange forks at both ends is consistent (error ≤ 2.5 °); 2. Tighten the connecting bolts to the standard torque (usually 120-150N · m); 3. Check the radial runout of the transmission shaft after assembly (should be ≤ 0.5mm). Fault diagnosis: If there is abnormal driving noise, body shaking, or decreased transmission efficiency, it is necessary to check the clearance between the universal joints (normal ≤ 0.3mm) or the wear of the splines; If the vibration frequency increases with the increase of vehicle speed, dynamic balance correction should be carried out.