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The Mitsubishi 4M40 engine was originally designed for the Mitsubishi Pajero off-road vehicle, with an output of 150 PS. It is an automotive diesel engine, featuring a timing chain drive, single overhead camshaft (SOHC), and shim-type valve clearance adjustment. The original engine was equipped with ... Read More
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The Mitsubishi 4M40 engine was originally designed for the Mitsubishi Pajero SUV, with an output of 150 PS. It is an automotive-type diesel engine, featuring a timing chain drive, single overhead camshaft (SOHC), and shim-adjusted valve clearance. The original fuel injection pump was a Delphi (U.S.) ... Read More
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For construction machinery that has been in service for many years, overheating is a common — and often frustrating — issue. Let’s explore the problem in a practical way. For machines that were originally well-designed and proven reliable, their hydraulic systems were fully capable of meeting normal ... Read More
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I once worked for several years in a large state-owned enterprise, mainly engaged in the repair of imported on-road and off-road trucks, so I have some experience in truck maintenance. (Repairing loaders, however, belongs to the construction machinery field. I haven’t really repaired domestic ... Read More
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Normally, when hydraulic oil becomes contaminated by water, the standard procedure is to replace it with new oil. If the replacement is incomplete, it can leave hidden risks in the hydraulic system. There are multiple cases of hydraulic pump and swing motor failures and hydraulic cylinder seal ... Read More
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A batch of CAT 349E excavators (including the 336E series) purchased from Shenzhen entered the market. After a period of use, these machines all suffered from derated power and could not operate normally. Even the so-called “experts” who claim they can fix anything were unable to resolve the ... Read More
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This discussion covers basic knowledge, not a magical one-step solution. However, if you truly internalize this, it can bring significant practical benefits. Unfortunately, technical discussions in many forums are fading, and most posts are just: “My machine broke, what should I do?” 1. Purpose of ... Read More
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Construction machinery often encounters flooding due to construction activities, accidents, or natural disasters. Operators are advised to follow the guidelines below to properly handle machinery after it has been submerged. I. Do Not Start the Machine Prematurely Before thoroughly inspecting a ... Read More
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How can you distinguish high temperatures caused by poor combustion in an internal combustion engine? This is one of the occasional causes of high coolant temperatures in diesel engines. Because it belongs to a higher-level fault category and occurs infrequently, it’s rarely included in general ... Read More
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During the operation of construction machinery, rollovers happen from time to time for various reasons. We will not discuss safe operation practices or insurance claims here — this is a focused discussion on restorative handling of machines after a rollover. Whether small machines of a few tonnes or ... Read More
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