The CAT 325L is a mid-sized hydraulic excavator widely used in construction, mining, and heavy-duty earthmoving. One of its critical components is the swing bearing, a large, heavy-duty bearing that supports the entire upper structure of the excavator, allowing it to rotate or "swing" with precision. Like all mechanical parts subjected to high loads and repetitive motion, the swing bearing needs regular maintenance to avoid costly failures and ensure the smooth operation of the machine. This article explores the importance of the swing bearing, common issues associated with it, and the steps to diagnose, repair, and replace the swing bearing on the CAT 325L.

- Read More -

Overheating in older crawler tractors such as the Caterpillar D6C is a classic problem that often reveals deeper issues within the cooling and lubrication systems. When coolant contamination, oil intrusion, or rapid temperature rise occurs, the root cause may involve multiple components working together—or failing together. This article provides a detailed, narrative‑style explanation of how overheating develops, how oil enters the cooling system, and how experienced mechanics diagnose and resolve these failures. Real‑world cases, terminology notes, and practical flushing techniques are included to help operators understand the full picture.

- Read More -

Reinstalling a track on a John Deere 490 excavator isn’t just “putting rubber back on”; it’s a task that involves understanding the undercarriage tension system, the idler and adjuster assembly, and the dynamic behavior of the track components under load. Tracks help distribute weight, provide traction, and allow the machine to travel over rough terrain. When a track comes off — whether due to wear, maintenance, or an obstacle — putting it back on can be straightforward or confusing, especially if the tensioner assembly doesn’t cooperate. This article breaks down the mechanical principles, common problems, terminology, and practical steps operators and mechanics use to get the track back on properly.

- Read More -

Transmission oil management on mid‑size wheel loaders such as the John Deere 544H is often underestimated, yet it directly affects machine longevity, shift quality, and hydraulic responsiveness. Operators frequently encounter confusion about dipstick readings, fill‑tube oil height, and whether the engine should be running during checks. This article provides a detailed, narrative‑style explanation of how transmission oil behaves inside the 544H, why dipstick readings can appear misleading, and what experienced mechanics have learned through years of field work. Additional stories, technical notes, and real‑world cases help illustrate the principles behind proper transmission oil inspection.

- Read More -

Biodegradable synthetic lubricants are engineered fluids designed to protect and extend the life of machinery while minimizing environmental impact. In heavy equipment applications—such as construction, agriculture, forestry, and mining—lubricants are essential for reducing friction, preventing wear, and carrying heat away from moving parts. Traditional petroleum‑based oils and greases can persist in soil and water for years if spilled, posing ecological risks. Biodegradable synthetic lubricants offer a high‑performance alternative that breaks down more readily in the environment without sacrificing the protective qualities operators depend on. Their adoption is growing globally as companies balance sustainability goals with equipment reliability and regulatory compliance.

- Read More -

In the operation and management of heavy equipment, unusual behavior or unexpected occurrences can signal potential problems ranging from mechanical failure to human error or even deliberate misconduct. Identifying and understanding these "shenanigans" is crucial for safety, operational efficiency, and financial protection. Operators, managers, and technicians need to be aware of subtle indicators that something may be amiss with equipment performance, maintenance records, or operator conduct. This article explores typical signs, causes, and preventive measures to address suspicious activity or irregularities in heavy equipment operations.

- Read More -

The chaincase breather is a critical yet often overlooked component in many tracked heavy equipment machines, including bulldozers, excavators, and loaders. Its primary role is to allow air to escape and enter the chaincase as the internal pressure fluctuates during operation, preventing oil leaks, contamination, and pressure build-up. A malfunctioning or clogged breather can lead to a range of operational issues, including oil seal failures, excessive chaincase pressure, and premature wear of internal components. Understanding the function, symptoms, causes, and maintenance of chaincase breathers is essential for operators and mechanics to ensure the longevity and reliability of their machines.

- Read More -

The Kobelco SK60 Mark III is a versatile and compact crawler excavator widely used in the construction and excavation industries. Known for its reliability, this model is favored for its fuel efficiency and powerful hydraulics. However, like any piece of heavy machinery, it is not immune to hydraulic problems. Common hydraulic issues that may arise in the Kobelco SK60 Mark III include a drop in hydraulic pressure, slow response times, and erratic movements of the boom, arm, or bucket. Diagnosing and fixing hydraulic problems can be challenging but is essential to maintain the optimal performance of the excavator. This article delves into common hydraulic issues with the SK60 Mark III, their symptoms, potential causes, and solutions.

- Read More -

The Volvo ECR88 is a compact excavator known for its smooth hydraulic response, efficient engine, and strong performance in tight working environments. However, like many machines with load‑sensing hydraulics and electronically monitored systems, it can develop complex symptoms when either the engine or hydraulic circuits fall out of balance. A real‑world case involving an ECR88 with 9,000 operating hours revealed a puzzling combination of issues: slow bucket movement, engine bogging under load, overheating, and complete hydraulic loss after extended operation.

- Read More -

The NTA-855 is a powerful engine developed by Cummins that has been widely used in various heavy machinery, including construction equipment, trucks, and marine applications. Like any other engine, the NTA-855 can experience issues related to its components, and one of the more common problems is a leaking front crankshaft seal. This seal plays a critical role in preventing engine oil from leaking out where the crankshaft passes through the engine block, and failure to address a leaking seal promptly can result in serious engine damage. Replacing the front crankshaft seal is a necessary repair for maintaining engine integrity and avoiding costly damage to other parts.

- Read More -

Modern skidders like the John Deere 648H rely heavily on electronic control systems to manage transmission behavior, safety interlocks, and machine diagnostics. When a fault code appears on the display—especially one that references the transmission control unit (TCU)—operators often find themselves uncertain about the meaning of the message or the severity of the issue.

- Read More -

The Peterbilt 335 and 337 series represent a class of medium‑duty vocational trucks widely used as service, mechanic, and utility trucks in construction, field maintenance, and industrial applications. Built by Peterbilt Motors Company, a respected U.S. truck manufacturer with roots stretching back to the 1930s, these models offer a blend of durability, torque capacity, and customization potential that make them ideal platforms for crane‑equipped service bodies, tool storage, and on‑site repairs. The 337 replaced the 335 as Peterbilt’s mid‑range model, with improvements in visibility, cab design, and powertrain flexibility. Professionals seeking a service truck chassis often pair these trucks with aftermarket service beds and cranes to create mobile workshops capable of handling heavy‑duty tasks in remote and urban environments alike.

- Read More -

The Caterpillar D7H Series II is a powerful and respected dozer, widely used in earthmoving, forestry, and mining operations. Its steering and braking systems rely on a complex hydraulic network that must maintain precise pressures to ensure safe and responsive operation. When a machine undergoes major repairs—such as transmission rebuilds, torque converter replacement, or steering clutch overhauls—technicians often perform a full pressure‑testing procedure to verify that the hydraulic system is functioning within specification.

- Read More -

The Caterpillar 319D hydraulic excavator is a mid‑sized machine widely used in construction, earthmoving, utilities, and landscaping. Its reliable Cat C4.4 diesel engine, advanced electro‑hydraulic controls, and robust undercarriage make it a favorite with contractors who need a balance of power and portability. However, a recurring issue many operators encounter is throttle drop‑out—a sudden reduction in engine speed or loss of throttle response during operation. This problem can severely affect productivity, safety, and fuel economy. Understanding why throttle drop‑out occurs, the key systems involved, and how technicians diagnose and repair it is crucial for maintaining performance and avoiding unnecessary downtime.

- Read More -

Among the many unusual machines that appeared during the mechanization of forestry work, few are as distinctive as the International TC‑5 skidder. With its rubber‑tired track system, compact crawler‑like stance, and unconventional engineering, the TC‑5 represents a fascinating chapter in the evolution of logging equipment. Although rare today, the machine still sparks curiosity whenever one appears at a show or on a trailer—often prompting questions about its origin, purpose, and performance.

- Read More -

The Liebherr 902 excavator from the mid‑1980s represents a generation of European-built machines known for their robust hydraulic systems and long service life. Many of these machines remain in private yards, farms, and small construction fleets, often still capable of productive work despite their age. However, when a machine sits unused for years or suffers a hydraulic failure, issues such as uneven track speed can appear.

- Read More -

Acquiring a Caterpillar 955L track loader—especially a used or “new to me” unit—is a milestone for any equipment enthusiast or small contractor. The 955L is part of Caterpillar’s storied line of Caterpillar track loaders, bridging the gap between compact loaders and full‑sized dozers. Known for robust construction, impressive traction, and versatile performance, these machines have served across logging, site cleanup, excavation support, and general material handling for decades. This article explores not only buying and owning a used 955L but also its technical context, common maintenance themes, terminology, and real‑world anecdotes that bring the machine’s reputation to life.

- Read More -

Hydraulic oil selection is one of the most important maintenance decisions for any backhoe loader, especially for machines like the JCB 214 Series 2, which rely heavily on smooth hydraulic performance for digging, lifting, and steering. Using the correct oil grade ensures proper lubrication, stable hydraulic pressure, and long component life. A simple question about which oil to use opens the door to a deeper understanding of viscosity grades, climate considerations, and real‑world experiences from operators who maintain these machines daily.

- Read More -

Blade tip angle is one of the most important factors that determines how effectively a snow plow moves snow, how much fuel it consumes, how hard the machine works, and how clean the surface ends up. Whether operators are using a grader, loader, skid steer, or pickup‑mounted plow, controlling the tip angle allows snow to roll off the blade or cut through wind‑blown drifts efficiently. Incorrect blade orientation results in snow spilling back onto the cleared area, increased wear on the machine, and greater operator fatigue. This article explains snow plow tip angle fundamentals, terminology, real‑world adjustments for various conditions, common mistakes to avoid, and practical tips from experienced operators who have spent decades clearing snow in harsh climates.

- Read More -

The Trojan 124A wheel loader is a product of an earlier generation of American heavy equipment—machines built with thick steel, simple hydraulics, and straightforward electrical systems. Many of these loaders remain scattered across farms, ranches, and small construction yards, often sitting unused for years before someone decides to bring them back to life. When that moment comes, one of the first challenges owners face is understanding the electrical system, especially when the machine has been dormant for half a decade or more.

- Read More -

A mangled wheel stud—a wheel stud that has been rounded, twisted, bent, or stripped—is a common and frustrating problem in heavy equipment, trucks, and trailers. Wheel studs are the threaded fasteners that secure wheels to hubs. When these studs become damaged due to over‑tightening, corrosion, cross‑threading, impact tool misuse, or extended use without proper torque, the wheel can no longer be safely secured. Removing a mangled wheel stud can be challenging because the very shape of the stud is compromised. Without the right approach, hastily applied force can damage the hub, brake drum or rotor, and surrounding components. This article explains why studs fail, the tools and techniques professionals use to extract them, key terminology, and real‑world examples of successful removals.

- Read More -

Wood chippers powered by small automotive‑derived engines—such as the Hyundai 1.6‑liter unit built under Zenith control—are known for their reliability, but they can also present unique diagnostic challenges. When a chipper begins flashing both rich and lean fault codes, operators often assume the oxygen sensor is failing. However, these symptoms can indicate a deeper issue involving the MAP sensor, vacuum integrity, fuel metering, or even the electronic control module’s interpretation of sensor data.

- Read More -

The Yanmar B22 is a compact crawler tractor that has built a strong reputation among small‑scale farmers, landscapers, and construction operators for its reliability, versatility, and rugged design. Introduced as part of Yanmar’s line of utility tractors, the B22 blends modest horsepower with excellent traction and low ground pressure, making it particularly suited for tight spaces, muddy terrains, and steep grades where larger tractors struggle. As a preferred machine for hillside vineyards, small forestry work, and general estate management, the B22 often comes up in discussions about used equipment purchase decisions. Understanding its strengths, common issues, key terminology, and real‑world use cases can help prospective buyers make an informed investment.

- Read More -

Mini excavators in the 1.8‑ton class have become indispensable tools for homeowners, landscapers, small contractors, and rural property owners. Their compact size, low operating cost, and ability to perform precise work make them ideal for clearing vegetation, maintaining trails, digging trenches, and shaping land. When choosing between two respected brands—Volvo and Komatsu—the decision often comes down to subtle differences in performance, long‑term ownership considerations, and the realities of local markets.

- Read More -

The Caterpillar D6B is a classic medium track-type tractor widely used in construction, forestry, and agricultural work during the mid-20th century. Renowned for its robust design and reliable performance, the D6B was an evolution of the earlier D6 models, featuring improvements in engine output, track systems, and operator control. Despite its durability, older units often experience steering challenges due to wear in hydraulic systems, linkages, and track components. Understanding these issues is crucial for operators and restorers aiming to maintain or restore functionality.

- Read More -

The Mitsubishi MS180‑3 excavator is one of those machines that quietly served construction sites, utility projects, and small contractors for decades. Although Mitsubishi’s excavator line never reached the global dominance of brands like Caterpillar or Komatsu, many of their machines were rebadged, shared components with other manufacturers, or were sold under joint‑venture agreements. This history often creates confusion when owners attempt to source replacement parts—especially hydraulic hoses and fittings.

- Read More -

The Hough International H‑70 is a classic heavy‑duty wheel loader from the mid‑20th century, widely respected among collectors and operators of vintage construction equipment. Built by Hough International, a brand once affiliated with International Harvester Company, the H‑70 belongs to a lineage of front‑end loaders commonly known as “Payloaders”—a term originally trademarked by Hough but later used generically for similar machines. The loader was designed for robust work on farms, quarries, yards, and job sites, and many examples built in the 1950s and 1960s remain in use or have been restored by enthusiasts decades later.

- Read More -

A Caterpillar 325 excavator that suddenly loses all hydraulic functions—while the engine continues to run normally—presents a serious operational and diagnostic challenge. When a machine stops in the middle of digging, leaving the bucket suspended in the air and all controls unresponsive, the cause is almost always tied to the pilot system or the main pump drive. These failures can occur without warning and often leave operators stranded with a machine that appears to be running but cannot move, lift, or swing.

- Read More -

When it comes to compact skid steer loaders, two of the most recognized brands in the industry are Bobcat and Caterpillar (CAT). The Bobcat S630 and CAT 246D are both excellent choices for various tasks such as landscaping, construction, and material handling. However, choosing between the two models can be difficult, especially since both machines offer distinct features and capabilities. In this article, we will explore the key differences and similarities between the Bobcat S630 and CAT 246D to help you make an informed decision.

- Read More -

A Gehl DL-6H telehandler exhibited a dramatic failure when hydraulic oil sprayed from the axle breather upon releasing the parking brake. This symptom pointed to a breach in the internal seal system, allowing pressurized fluid to escape into the axle housing. Wet brake systems, which use hydraulic pressure to engage and disengage internal brake discs submerged in oil, are particularly vulnerable to seal degradation and component fatigue.

- Read More -

The Ford 555C is a backhoe loader model that has earned its reputation as a reliable, durable piece of construction machinery. Introduced in the early 1980s, the 555C was designed to tackle a variety of tasks on construction sites, including digging, lifting, and loading. Over the years, many operators and equipment owners have shared experiences with this machine, detailing both its strengths and common issues. In this article, we will take a deep dive into the Ford 555C backhoe loader, examining its key features, typical problems, and maintenance tips to ensure optimal performance and longevity.

- Read More -

The International TD25 is a heavy-duty crawler dozer introduced in the late 1970s, often compared to the Caterpillar D8K in terms of size and performance. With a ripper-equipped rear and a tilt blade, the TD25C variant offers robust earthmoving capabilities.

- Read More -

Car haulers, or vehicle transport trailers, are specialized trailers designed for the transportation of vehicles from one location to another. They play an essential role in industries ranging from automotive sales and auctions to moving companies and logistics operations. These trailers are designed to carry multiple vehicles simultaneously, providing a cost-effective and efficient solution for transporting cars, trucks, and other vehicles across long distances.

- Read More -

An International TD8E dozer, recently revived after sitting idle in a barn for 3–5 years, began exhibiting a puzzling transmission issue. The machine started and ran well, steering properly and shifting smoothly through all gears. However, after driving a short distance, it would begin to slow down, with the driveshaft visibly decelerating. The engine maintained full RPM and showed no signs of fuel starvation or surging, ruling out engine-related causes.

- Read More -

JCB machinery is renowned for its robust performance and versatility, particularly in construction and agricultural applications. Among the various components that ensure smooth operation, the slew brake is one of the most critical for maintaining stability and control. The slew brake is responsible for controlling the rotation of the upper structure of the machine, whether it be an excavator, backhoe loader, or another type of tracked vehicle. However, when problems arise with the slew brake system, it can lead to significant operational issues, including poor control of the machine’s rotation, safety concerns, and potential for further mechanical damage.

- Read More -