Air Filter Kit (空气滤清器套件): Consists of primary and secondary filters that clean the air entering the engine, preventing dust and debris from causing damage. Installed in the engine's air intake system. Example: Caterpillar Loader 928F uses Air Filter Kit 6I-2499.

Belt Tensioner (皮带张紧器): Maintains the correct tension on engine belts, ensuring proper function of components like the alternator and fan. Located on the engine block, guiding the belt. Example: Caterpillar Loader 980G uses Belt Tensioner 217-8938.

Coolant Tank (冷却液箱): Holds the engine's coolant, allowing for expansion and contraction as temperature changes. Typically found near the engine, connected to the radiator. Example: Caterpillar Excavator 336 uses Coolant Tank 502-4178.

Hydraulic Cylinder Seal Kit (液压缸密封套件): Contains seals to prevent leaks in hydraulic cylinders, essential for the operation of various machinery functions like lifting and digging. Installed within the hydraulic cylinder assembly. Example: Caterpillar Motor Grader 14H uses Hydraulic Cylinder Seal Kit 235-0355.

Turbocharger (涡轮增压器): Forces more air into the engine, increasing power and efficiency. Attached to the engine's exhaust and intake manifolds. Example: Caterpillar Engine 3406 uses Turbocharger 144-4568.

Crankshaft Front Seal (曲轴前油封): Prevents oil leaks from the front of the engine where the crankshaft exits. Located at the front of the engine block, around the crankshaft. Example: Caterpillar Engine 3054C uses Crankshaft Front Seal 288-0422.

Hydraulic Filter (液压滤清器): Removes contaminants from the hydraulic fluid, protecting the hydraulic system from wear and damage. Typically located in the hydraulic lines or within the hydraulic tank. Example: Caterpillar Loader 924F uses Hydraulic Filter 9T-5916.

Top Roller (上支重轮): Supports the upper part of the track in tracked machinery, ensuring smooth movement. Found along the top of the track frame. Example: Caterpillar Loader 933C uses Top Roller 6S-3609.

Swing Drive (回转马达): Enables the rotational movement of the upper structure in excavators. Mounted on the excavator's undercarriage, connected to the upper frame. Example: Caterpillar Excavator 320 uses Swing Drive 378-9517.

Fuel Injection Pump (燃油喷射泵): Delivers fuel to the engine's cylinders at the correct pressure and timing. Mounted on the engine block, connected to the fuel lines and injectors. Example: Caterpillar Loader 226B uses Fuel Injection Pump 302-7821.