4455979 Original Door Lock Cover for Hitachi ZX250K-3 ZX110 ZX120 ZX130H ZX160 ZX200

Part number 4455979 is the official serial number for Hitachi's original excavator door lock mechanism related accessories. In the spare parts system, it usually refers to a core component or repair kit of the door lock assembly, such as the lock cylinder sleeve, lock tongue buckle, linkage rod bushing, or precision small parts inside the entire lock body. It is mainly suitable for the cab door or engine hood door lock mechanism of Hitachi ZX series (such as ZX200, ZX240, ZX330, etc.) and some EX series excavators. Due to the different generations of modifications in the door lock system, in order to ensure full compatibility, clear photos or old parts of the excavator's complete model, serial number, and faulty lock must be provided during procurement for accurate matching.

This door lock sleeve is a key wear-resistant or transmission component in the door locking mechanism. Its core function is to withstand impact and wear during frequent opening and closing operations, ensuring precise engagement and disengagement of the lock tongue and lock buckle, achieving reliable locking and smooth opening of the car door, and possessing certain anti pry and anti vibration loosening capabilities. As an original component, it is usually made of high-strength alloy steel, zinc alloy die-casting parts, or special engineering plastics. After precision machining and heat treatment, it has excellent wear resistance, impact resistance, and corrosion resistance. Its dimensional tolerance is strictly controlled to ensure perfect fit with other components of the lock body, avoiding door looseness, abnormal noise or locking failure due to improper clearance.

The maintenance core of this component lies in regularly checking the smoothness of the overall action of the lock, eliminating abnormal noise, and timely replacing worn parts. Daily inspection: It is recommended to operate the door lock regularly to check for any jamming, looseness, or abnormal resistance, and to check whether the lock tongue and lock buckle are engaged properly and whether there is any uneven wear. Lubrication and maintenance: A small amount of specialized graphite lubricant or dry lubricant can be sprayed on the lock tongue, lock core, and movable joints every quarter or every 500 working hours. It is strictly prohibited to use grease that is prone to sticking to dust. Replacement timing: When the car door cannot be locked at once, there is abnormal noise from the door lock during driving, or the lock cylinder/tongue is significantly shaking, the lock should be disassembled and inspected.