Caterpillar Undercarriage Parts & Hydraulic Cylinders for Excavators and Drilling Rigs - May 23, 2025
Track Rollers (Bottom Rollers): Designed to support the weight of the machine and allow smooth movement of the tracks. Examples include: 178-7288, 1787288 (for 365, 374), 178-7293, 1787293 (for 345, 349), and for models 330, 336, 325, 329, 385, 390 with part number 355-0374, 3550374.
Carrier Rollers (Top Rollers): Help to keep the track aligned and prevent sagging. Examples include: 248-7285, 2487285 (for 365, 374) and for models 345, 349.
Idlers: Positioned at the front of the undercarriage, idlers guide the track and maintain proper tension. Our selection caters to models 385, 390 (part number 355-0374, 3550374), 365, 374, 345, 349.
Sprockets: Engage with the track links to drive the movement of the excavator or drilling rig.
Track Links: Individual components connected to form the track chain. Part numbers like 179-3426, 1793426 (seal), 179-3425, 1793425 (seal), 6Y1607, 6Y1608, 9W3137, 9W3138, 305-9363, 3059363, 305-9364, 3059364, 296-4359, 2964359, 296-4360, 2964360 ensure a perfect fit for models 325, 329, 320, 323, 318, 315, 324, 326, 385, 390, 345, 349, 330, 336.
Track Shoes (Track Plates): Provide traction and support for the machine. Examples include 6Y2126, 6Y2126 for models 330, 336.
Track Roller (支重轮 - Опорный каток): Supports the weight of the excavator and allows the track to move smoothly. Typically installed on the undercarriage frame. Example: Caterpillar 345D Track Roller (卡特彼勒 345D 支重轮 - Опорный каток Caterpillar 345D).
Carrier Roller (托链轮 - Поддерживающий ролик): Keeps the track chain running straight and prevents it from sagging between the track roller and the sprocket. Located on the upper part of the undercarriage. Example: Caterpillar 320D Carrier Roller (卡特彼勒 320D 托链轮 - Поддерживающий ролик Caterpillar 320D).
Idler (引导轮 - Направляющее колесо): Positions the track at the front of the undercarriage and helps maintain track tension. Example: Caterpillar 336D Idler (卡特彼勒 336D 引导轮 - Направляющее колесо Caterpillar 336D).
Sprocket (链轮 - Ведущая звездочка): A toothed wheel that engages with the track links to drive the excavator. Located at the rear of the undercarriage.
Track Link (链节 - Звено гусеницы): One of the individual metal pieces that make up the track chain. Connected by pins and bushings. Example: Caterpillar 349D Track Link (卡特彼勒 349D 链节 - Звено гусеницы Caterpillar 349D).
Track Shoe (履带板 - Гусеничная пластина): Bolted to the track links, providing traction and support over various terrains. Example: Caterpillar 385C Track Shoe (卡特彼勒 385C 履带板 - Гусеничная пластина Caterpillar 385C).
Hydraulic Cylinder (液压油缸 - Гидравлический цилиндр): A component that uses hydraulic power to produce linear motion and force. Used in various parts of the excavator arm and body. Example: Caterpillar 374D Hydraulic Cylinder (卡特彼勒 374D 液压油缸 - Гидравлический цилиндр Caterpillar 374D).
Bottom Harness (底盘线束 - Жгут проводов ходовой части): A collection of wires bundled together to transmit electrical power and signals to components located in the undercarriage of the excavator.
Solenoid Valve Harness (电磁阀线束 - Жгут проводов электромагнитного клапана): Connects the excavator's main wiring system to the solenoid valves that control hydraulic functions.
Engine Harness (发动机线束 - Жгут проводов двигателя): Supplies power and carries signals to and from the engine's various sensors and actuators. Example: Caterpillar C9 Engine Harness (卡特彼勒 C9 发动机线束 - Жгут проводов двигателя Caterpillar C9).
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🛠️ Troubleshooting and Solution: This can often be attributed to a malfunctioning boom solenoid valve (动臂电磁阀故障 - Неисправность электромагнитного клапана стрелы). First, check the electrical connections to the valve. If the connections are secure, test the valve's coil for continuity. If the coil is faulty, it needs replacement. Additionally, inspect the hydraulic oil level and condition, as low or contaminated oil can also cause this issue. If the problem persists after checking these points, further diagnosis of the hydraulic system may be required.
