3112303 Original Loader Spacer for Hitachi ZW220

The original gasket part number 3112303 is a key sealing or adjusting component provided by Hitachi Construction Machinery for the ZW220 wheel loader (with a total operating weight of approximately 17370kg and a rated load capacity of 5000kg). This gasket is mainly used to fill mechanical assembly gaps, adjust tolerances, achieve sealing or shock absorption, and is commonly found in key connection parts such as engines, transmissions, hydraulic pumps, and drive axles. Its universal models may include Hitachi loaders of the ZW220-5A and ZW220-6 series, as well as similar tonnage models such as ZW250 and ZW330. As a precision accessory from the original factory, it is deeply matched with various systems of the vehicle. The use of non-standard auxiliary parts is strictly prohibited to ensure assembly accuracy and sealing reliability.

This product is an original adjustment/sealing gasket. Depending on its application location, it can be a metal gasket (stainless steel SUS304/316) or a non-metal gasket (graphite, asbestos, PTFE composite material). Typical technical parameters: thickness range 0.005-3.00mm (tolerance ± 0.001-0.035mm), hardness HRC43-47, surface roughness Ra ≤ 0.2 μ m. The metal gasket adopts cold forming/precision grinding technology, which has high precision, high toughness, and corrosion resistance characteristics; Non metallic gaskets (such as wrapped gaskets) are made of stainless steel strips and flexible materials with a spiral winding structure, with a working pressure of ≤ 25MPa, suitable for working conditions with uneven loads and impact vibrations. This gasket complies with standards such as ISO 6193, DIN 988, GB/T 97.1, etc., and can effectively compensate for component aging gaps and prevent medium leakage.

Inspection cycle: It is recommended to check the sealing surface of the gasket for indentation, cracks, and aging every 500 working hours; Check the bolt tightening torque every 1000 working hours (as specified in the maintenance manual). Installation points: 1 Clean the joint surface (using solvents such as acetone to remove oil stains and old glue); 2. Measure the gap (use a plug gauge to determine the required gasket thickness); 3. Install the center (ensure that the gasket is not skewed or misplaced); 4. Tighten the bolts evenly in a cross order (2-3 times to the specified torque). Fault diagnosis: If there is oil leakage, loose joint surface, or abnormal noise, it is necessary to check whether the gasket is crushed, aged, or of improper thickness; If the seal fails, it should be replaced immediately and the flatness of the flange should be checked (should be ≤ 0.05mm). Preventive maintenance: Disassemble, inspect, and replace disposable gaskets every 2000 working hours; Regularly clean the bolt threads and apply anti seize compound. Safety regulations: Before operation, the negative terminal of the battery must be disconnected and carried out in a clean and dry environment; Discarded gaskets should be disposed of according to industrial waste standards. Always use genuine original parts and operate according to the maintenance manual to ensure long-term stable operation of each system.