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I appreciate the help from Paul, he's prefessional and knows exactly what parts I need. My CAT has gone back to work without any problem.

—— Raphael

Got the final drive and its beautiful I think. We've have it assembled in our Hitachi ZX330 excavator, my machines goes to work again now. Many thanks

—— Kevin

Fast shippment, the arrived parts is good quality, our engine is repaired and is perfectly running at maximum power. Thank you, god bless.

—— Mohammed

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Company Blog

On the Ways (and Shortcomings) of Seeking Help for Machine Failures

[2022-10-21 12:14:21]

When machines are in operation, problems and malfunctions are inevitable. When you can’t fix them yourself, there are usually a few common ways operators seek help: Call the nearest mechanic. Ask another operator who’s dealt with similar issues. Turn to an experienced repair shop. Contact a dealer’s ... Read More

Expansion of the Maintenance Team and a Discussion on the Use of CAT Excavator Backup Switches

[2020-10-15 12:08:55]

Building a Reliable Technical Support Network To better provide reliable, timely, and high-quality repair and maintenance services for our fellow operators (not limited to excavators but covering various types of construction machinery), we have organized a team of experienced service engineers and ... Read More

Fuel-Saving Retrofit for CAT 320 (323) D-Series Excavators

[2018-10-18 12:05:44]

The legendary CAT 320 (323) D-series — once hailed as the “first-generation miracle machine” — has been in operation for over a decade and is now entering its twilight years. Known for their strong power and high fuel consumption, these machines are now giving their long-time owners a real headache ... Read More

Operating and Maintaining Air-Conditioning Systems in Construction Machinery

[2019-08-29 14:58:33]

Nowadays, almost all machines come equipped with air-conditioning systems, except for open-cabin naturally ventilated models. When I first started in on-site CAT technical service more than twenty years ago, this was almost unimaginable. Back then, only CAT machines offered air-conditioning as ... Read More

Air Bleeding Procedure for Hydraulic Systems After Maintenance

[2022-09-22 14:55:23]

Regardless of the machine size, brand, or hydraulic structure—even for gear pumps—it is crucial to remove any air trapped in the hydraulic system after maintenance or component replacement. This step is very important. For example, a CAT 330C excavator suffered three consecutive new gear pump ... Read More

On the Root Cause of Complaints About CAT Machines Using the 4M40 Engine

[2023-08-23 12:00:59]

The 4M40 engine was installed in several models of CAT excavators as well as a few small models under the Sumitomo brand. This engine is now discontinued, but it was originally designed by Mitsubishi for the Pajero (Leopard) SUV. It was intended to be a high-speed engine, and not only CAT but also ... Read More

CAT New Generation Electronically Controlled Fan – Usage and Maintenance

[2024-05-23 14:50:07]

The new generation CAT machines are equipped with electronically controlled fans (EC fans) that offer: Low power consumption High maintainability Controllable rotation direction Improved engine thermal efficiency However, these fans require proper maintenance. Neglect can lead to high engine ... Read More

New Generation CAT Excavator Electronic Control Valve (ECV)

[2021-09-24 14:45:34]

1. Historical Background Origin: CAT began developing electronic control valves in the early 20th century and applied them to large excavators, such as the 374D series. Development: In 2011, during a new machine training session in Yinchuan, Ningxia, I personally studied these systems. To this day, ... Read More

Excavator Basic Structural Components: Usage and Maintenance

[2019-09-20 14:42:12]

Definition: For an excavator, basic structural components refer to: Upper and lower turntables, main frame; Boom, arm, and other structural members that do not require frequent short-cycle maintenance. While these components are designed for long-term use, failures can still occur due to diverse ... Read More

How to Diagnose Hydraulic Cylinder Seal Failure

[2025-01-10 14:39:35]

In construction machinery, the seals of hydraulic cylinders gradually wear out and fail during operation, leading to internal leakage (if you can’t spot external leakage, you must have had too much to drink at lunch). Internal leakage is not only harmful to normal machine performance but can also ... Read More

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