Saijuki Engineering, a heavy equipment repair company in Kumagaya, Saitama, Japan, shares the top 3 repairs we are most often asked about. Knowing in advance where breakdowns tend to occur helps you prevent serious accidents and lost work days.

Top 3 Most Common Repairs on Excavators and Construction Machinery

Let’s get straight to the point.
Knowing the parts that fail most often (even if you already know them) helps you pay attention during routine maintenance and inspections, and quickly narrow down the cause when something feels wrong.

No. 1: Hydraulic cylinder oil leak repairs

Almost all heavy equipment uses hydraulic power to deliver the force needed for work that could never be done by hand.

This part carries the heaviest load in the machine’s movements, deteriorates quickly with age, and can be said to fail most often.

We recommend regular visual checks for oil leaks and seepage, along with periodic oil changes and seal replacements.

Some owners repair only after a leak occurs every time, but to make your machines last longer, we strongly recommend a preventive approach: overhaul before a failure happens.

No. 2: Sheet metal, painting and welding repairs

As you can see from our repair case studies, we receive many inquiries and requests for sheet metal, painting and welding repairs on heavy equipment.

A major benefit of sheet metal repair and painting is rust prevention.
Heavy equipment gets hit and bumped, and works every day under the hot sun, wind and rain; its body takes a real beating.

Rust means the metal is exposed with no protection, and if left untreated, deterioration can progress rapidly.

Don’t leave rust or damage untreated thinking “it doesn’t matter anyway.”
Have sheet metal, painting and welding repairs done as early as possible.

No. 3: Derailed tracks and rubber track / rubber pad replacement

Overall, undercarriage-related repairs rank third.
Long travel distances to job sites or rocky sites increase wear and damage to rubber tracks and rubber pads, and tracks also tend to come off more often.

With an oil leak, you might be able to keep working for the day in the worst case, but an undercarriage failure physically stops the machine, and the damage to the job can be enormous.

In addition to daily maintenance, replace these parts early and regularly.
If the worst happens, Saijuki Engineering provides on-site repair across the Kanto area, centered on Saitama.
Please contact us by phone, WhatsApp or LINE.

Summary

In this article, we have introduced the top 3 most common repairs on excavators and construction machinery in a ranking format.

Of course, the ranking and details will differ depending on the region and the characteristics of each company.
This is only the example of Saijuki Engineering, a heavy equipment repair company in Kumagaya, Saitama, Japan.

However, what is true everywhere is that repairs around hydraulic cylinders are common.
This is unavoidable given the nature of heavy equipment.
The most important thing is early detection and early replacement before a failure stops your work.

If you don’t have time for regular inspections or are worried about missing something, please consult Saijuki Engineering.
We offer a range of plans and support. For overseas buyers, we can also repair and refurbish machines in Japan before export.