Reviving a Vintage Caterpillar Dozer
In the rugged terrain of the Pacific Northwest, a weathered Caterpillar dozer sat dormant for nearly a decade before being coaxed back to life. The machine, likely a D6 or D7 from the 1950s or early 1960s, bore the marks of hard labor—rusted panels, faded paint, and a canopy that may have once carried the Fleco brand, a company known for producing forestry protection gear and custom attachments for heavy equipment.
Despite its age, the dozer’s core remained intact. With a few hours of effort, a pair of operators managed to start the engine, load it onto a trailer, and deliver it to its new home. The process involved checking fuel lines, priming the injectors, and manually engaging the starter—a testament to the mechanical simplicity and resilience of early Caterpillar designs.
Fleco Canopies and Forestry Adaptations
Fleco, short for Florida Equipment Company, was a prominent supplier of aftermarket attachments in the mid-20th century. Their forestry canopies were designed to shield operators from falling limbs and debris during logging operations. These structures were often bolted directly to the dozer’s frame and featured reinforced mesh and steel plating.
In regions like Oregon and Washington, Fleco-equipped dozers were common in timber clearing and road building. The canopy seen in the revived machine may have been part of such a setup, though its markings were no longer visible. Fleco ceased operations in the early 2000s, but their legacy lives on in the equipment still working in the woods.
Starting Old Equipment After Long Storage
Bringing a dormant dozer back to life requires patience and mechanical intuition. Key steps include:

• Fuel system inspection: Drain old diesel, replace filters, and check for water contamination
  
• Battery and electrical check: Clean terminals, test voltage, and inspect starter solenoid
  
• Oil and coolant levels: Ensure fluids are topped off and free of sludge
  
• Manual priming: Use hand pumps or gravity feed to get fuel to the injectors
  
• Starter engagement: Older models may require manual lever operation or external jump-starting
  

• Land clearing on private property
  
• Road maintenance in remote areas
  
• Historical demonstrations and restoration projects
  
• Training grounds for mechanical apprentices
  

• Sourcing parts from salvage yards or specialty suppliers
  
• Using non-detergent oils compatible with older seals and gaskets
  
• Installing auxiliary fuel filters to protect injectors
  
• Documenting serial numbers and build dates for accurate service
  

Engine Overview and Historical Context
The Caterpillar 3126 is a six-cylinder, inline diesel engine introduced in the mid-1990s as part of CAT’s push into electronically controlled mid-range powerplants. It replaced the mechanical 3116 and was widely used in vocational trucks, buses, and construction equipment. With horsepower ratings ranging from 170 to 330 hp, the 3126 became a staple in fleets across North America. It was eventually succeeded by the CAT C7 in the early 2000s, which built on its architecture but added advanced emissions controls.
The 3126 featured a cast iron block, wet sleeve design, and HEUI (Hydraulically actuated Electronically controlled Unit Injection) fuel system. Its versatility and serviceability made it popular among operators and mechanics alike.
Weight Estimates and Configuration Variants
The base weight of a CAT 3126 long block—which includes the block, crankshaft, pistons, camshaft, and cylinder head—is approximately 1,100 pounds (500 kg). However, when fully dressed with accessories such as:

• Turbocharger
  
• Flywheel and bell housing
  
• Alternator
  
• Starter
  
• Air compressor
  
• Wiring harness
  
• Intake and exhaust manifolds
  

• Use grade 8 bolts in lifting brackets
  
• Secure the engine with two-point lifting chains to prevent rotation
  
• Balance the load by adjusting chain length or using a spreader bar
  
• Keep the hoist on a flat, reinforced surface to prevent tipping
  

• Freightliner FL70 and FL80
  
• International 4700 series
  
• Sterling Acterra
  
• CAT 416 and 420 backhoes (in some configurations)
  
• Blue Bird and Thomas school buses
  

• HEUI pump failures due to oil contamination
  
• Injector harness wear
  
• Oil pan leaks
  
• Turbocharger bearing wear
  

When it comes to topsoil screening, selecting the right type of machine can significantly impact productivity, efficiency, and overall operational costs. Two common options for material handling and processing in construction and landscaping are skid steers and payloaders (also known as wheel loaders). While both machines are highly versatile, understanding their strengths and weaknesses in specific applications such as topsoil screening can help in making a more informed choice.
What is Topsoil Screening?
Topsoil screening is the process of separating large chunks of soil, debris, rocks, and organic matter from fine, clean topsoil. This process is essential for creating high-quality soil for landscaping, gardening, or construction projects. The screening machine sifts through the topsoil to remove unwanted materials, which can then be recycled or disposed of.
The type of machine used to feed the soil into the screening unit plays a crucial role in both the efficiency of the operation and the quality of the final product. Skid steers and payloaders are two types of machines that are often considered for this task, each with its unique features and capabilities.
Skid Steer Loaders
Skid steers are compact, agile machines that are well-known for their versatility. With a wide variety of attachments available, they are commonly used in construction, landscaping, and agricultural operations. Here are some key factors to consider when using a skid steer for topsoil screening:
Advantages of Skid Steers for Topsoil Screening

1. Compact Size:
   Skid steers are much smaller compared to payloaders, which makes them ideal for jobs in tight or restricted spaces. If the screening operation is being performed in a confined area or on a small site, a skid steer can maneuver easily where larger equipment might struggle.
   
2. Maneuverability:
   Skid steers are highly maneuverable, with their ability to turn in place, making them suitable for tasks that require frequent direction changes, such as approaching and dumping material into a screening machine.
   
3. Attachments for Versatility:
   Skid steers can be fitted with various attachments for different tasks. For topsoil screening, attachments like soil buckets, grapples, or specific screening buckets can be used to collect and handle soil. These attachments provide flexibility to perform different functions depending on the type of material being screened.
   
4. Cost-Effective:
   Skid steers generally have lower acquisition and operational costs compared to larger machines like payloaders. Their smaller size also means they are less fuel-hungry, reducing ongoing operational expenses.
   

1. Limited Capacity:
   The smaller size of the skid steer means it has a lower weight capacity and material handling capabilities compared to a payloader. For large-scale topsoil screening operations, the skid steer may require multiple trips to and from the screening unit, reducing overall efficiency.
   
2. Lower Lift Heights:
   Skid steers have limited lift heights, which can be problematic if the topsoil screening unit is elevated or requires material to be dumped into higher bins or hoppers. This could limit the effectiveness of the machine in certain scenarios.
   
3. Less Stability with Heavy Loads:
   While skid steers are highly maneuverable, they can become unstable when lifting or carrying heavy loads, especially on uneven terrain. This could be a concern if the material being handled is heavy or contains large, dense rocks.
   

1. Higher Load Capacity:
   Payloaders have much larger buckets and higher lifting capacities compared to skid steers. This makes them ideal for handling large volumes of topsoil and feeding the screening unit efficiently. For large-scale operations, a payloader can reduce the time spent making trips between the soil pile and the screening machine.
   
2. Greater Stability:
   Due to their size and weight, payloaders offer greater stability when lifting and moving large, heavy loads. This makes them more suitable for working with dense, wet, or compacted soil, which might be difficult for a skid steer to handle effectively.
   
3. Higher Lift Heights:
   Payloaders have a higher lifting range, which can be a significant advantage when feeding material into elevated screening units or large piles. This helps increase the versatility of the machine, allowing it to reach higher bins, trucks, or stockpiles with ease.
   
4. Faster Cycle Times:
   With their larger bucket sizes and powerful hydraulic systems, payloaders can move more material in less time, resulting in faster turnaround for topsoil screening operations. This leads to improved efficiency in high-demand environments.
   

1. Size and Maneuverability:
   Payloaders are much larger and bulkier than skid steers, making them less suitable for work in tight spaces or areas with limited access. Maneuvering around obstacles, such as fences, buildings, or other machinery, can be challenging.
   
2. Higher Operating Costs:
   Payloaders generally consume more fuel and require more maintenance than skid steers, making them more expensive to operate in the long run. Their larger size also means they have higher transportation costs when moving between job sites.
   
3. More Expensive to Purchase:
   The upfront cost of a payloader is generally much higher than a skid steer, making it a significant investment. For smaller projects or companies, this initial cost may not be justifiable.
   

• Project Scale: If you’re working on a large-scale operation with a need to move large volumes of soil quickly, a payloader is likely the better choice. Its high load capacity and stability make it more suited for heavy-duty tasks.
  
• Site Size and Accessibility: If your worksite is compact or has limited access, a skid steer would be a more practical choice. Its small size and superior maneuverability make it ideal for tight spaces.
  
• Budget: For smaller projects, or when operating costs are a concern, a skid steer may be the more cost-effective option. It is less expensive to purchase and maintain, and its fuel efficiency makes it an attractive choice for small to medium-scale operations.
  
• Material Type: If the material being screened is heavy, wet, or difficult to handle, a payloader will provide the power and stability necessary to handle such tasks effectively.
  

Trench collapses are a serious hazard in the construction and excavation industries, posing a significant risk to workers and equipment. These incidents, which occur when the sides of a trench cave in, can lead to severe injuries or even fatalities. This article will delve into the causes of trench collapses, the safety measures needed to prevent them, and the best practices for trenching operations.
Understanding Trench Collapses
A trench is an excavation that is deeper than it is wide, typically used for utility installations, pipelines, and other underground work. While trenches are an essential part of many construction projects, they are also highly dangerous if not properly designed and maintained. Trench collapses happen when the walls of the trench lose their structural integrity, causing the soil to fall in on itself. This can result in workers being trapped or buried under tons of earth, leading to severe injuries or death.
Common Causes of Trench Collapses
Several factors contribute to trench collapses, each of which can compromise the safety of the excavation. The following are the most common causes:

1. Improper Soil Conditions:
   The type of soil in which the trench is dug plays a crucial role in its stability. Soils such as clay, silt, or sandy soil are more prone to shifting and collapsing than harder soils like gravel. Loose or wet soil increases the risk of collapse, as water weakens the structure of the earth and makes it more prone to crumbling.
   
2. Lack of Shoring or Trenching Support:
   When trenches are dug to depths greater than five feet, they require proper support to prevent the walls from caving in. Shoring systems, which include supports like trench boxes, hydraulic shores, and vertical posts, are essential for providing stability to trench walls. Without these systems, trenches are at high risk of collapsing, especially if the trench is deep or the surrounding soil is unstable.
   
3. Overloading the Trench:
   Placing heavy equipment or materials near the edge of the trench can cause the walls to collapse. The added weight from nearby vehicles or construction materials can destabilize the trench walls, leading to a collapse. It’s critical to maintain a safe distance between the trench and heavy machinery or materials.
   
4. Vibration from Nearby Equipment:
   Construction equipment such as bulldozers, excavators, and compaction machines can create vibrations that cause the trench walls to loosen. This is especially true if these machines are operating near the trench. The vibrations may not seem significant, but over time, they can weaken the structural integrity of the trench.
   
5. Failure to Properly Inspect and Maintain the Trench:
   Regular inspection of trenches is vital for identifying early signs of potential collapse. Water accumulation, cracking, or bulging in the trench walls can indicate a weakened structure. Failing to monitor these signs and maintain the trench can lead to disastrous consequences.
   
6. Inadequate Weather Considerations:
   Weather plays a significant role in trench safety. Rain can saturate the soil, making it more prone to collapse. Cold temperatures can cause soil to freeze, while rapid thawing can also destabilize the trench. Construction workers must consider weather forecasts and take appropriate precautions before beginning or continuing work in these conditions.
   

1. Soil Analysis and Assessment:
   Before excavation begins, it’s essential to analyze the soil to determine its composition and stability. Soil tests will help determine the type of shoring system needed. If loose or unstable soil is detected, additional reinforcement may be necessary to prevent collapse.
   
2. Use of Shoring and Trenching Systems:
   According to OSHA (Occupational Safety and Health Administration) regulations, any trench that is five feet or deeper must have proper protective systems in place. This can include trench boxes (also known as trench shields), hydraulic shores, or sloping the trench walls. Each of these methods helps to stabilize the trench walls and prevent collapse.
   • Trench Boxes: These are portable systems made of steel or aluminum that create a safe working space within the trench. They are typically used in deep trenches and can withstand significant weight.
     
   • Hydraulic Shoring: These systems use hydraulic pistons to apply pressure to the trench walls, preventing them from collapsing. Hydraulic shoring is adjustable and can be used in a variety of trench sizes.
     
   • Sloping: This involves angling the trench walls at a specific slope to reduce the risk of collapse. The angle of the slope depends on the soil conditions and depth of the trench.
     
3. Proper Training for Workers:
   Workers should receive training in trench safety and be familiar with the hazards associated with trenching operations. They should be aware of the proper procedures for trench entry, how to spot early warning signs of collapse, and how to use safety equipment like harnesses and lifelines.
   
4. Inspection and Monitoring:
   Trenches must be inspected daily by a qualified professional before any work begins. During the course of the work, additional inspections should be carried out regularly to check for any signs of instability. If any unsafe conditions are detected, work should be stopped immediately until the issue is resolved.
   
5. Maintaining Safe Distances from Equipment and Materials:
   It is essential to keep heavy machinery and materials at a safe distance from the edges of the trench. This minimizes the risk of destabilizing the trench walls. Additionally, when working near a trench, operators should be trained to recognize the risks posed by operating too close to the excavation.
   
6. Water Management:
   Managing water flow into the trench is vital. Accumulating water can weaken the soil and cause the trench to collapse. Pumps and other drainage systems should be used to remove water from the trench, and workers should avoid working in trenches where water is pooling.
   

Bobcat S220 Loader Overview
The Bobcat S220 skid steer loader was introduced in the early 2000s as part of Bobcat’s high-performance S-series. With a rated operating capacity of 2,200 lbs and a turbocharged diesel engine producing 75 hp, the S220 was designed for demanding tasks in construction, landscaping, and agriculture. Its hydraulic system powers the lift arms, tilt cylinders, auxiliary attachments, and drive motors, making fluid integrity critical to performance.
Bobcat, founded in North Dakota in 1947, became a global leader in compact equipment by pioneering the skid steer loader. The S220 was part of a generation that emphasized operator comfort, serviceability, and hydraulic versatility.
Hydraulic Oil Capacity and System Layout
The S220’s hydraulic system includes:

• Reservoir tank: Holds approximately 5 gallons of hydraulic fluid
  
• Hydraulic lines and cylinders: Add another 2–3 gallons depending on attachment configuration
  
• Drive motor filters: Require periodic inspection and may retain fluid during service
  
• Auxiliary circuit: Used for tools like augers or grapples, adds variable volume
  

• Contamination is suspected: Water ingress, metal particles, or sludge
  
• Machine has sat idle for extended periods: Moisture and oxidation degrade oil
  
• After major hydraulic failures: Broken hoses, leaking seals, or motor shaft damage
  
• Scheduled maintenance interval is reached: Typically every 1,000 hours or annually
  

• Two hydraulic filters: One inline and one at the drive motors
  
• Return line screen: Captures large debris before fluid re-enters the tank
  
• Sight glass or dipstick: Used to check fluid level and clarity
  

• Replace both filters
  
• Inspect hoses for abrasion or cracking
  
• Check couplers and fittings for bypass leakage
  
• Clean the reservoir cap and breather to prevent contamination
  

• Anti-wear additives
  
• Oxidation resistance
  
• Water separation capability
  
• Compatibility with seals and hoses
  

Sweepers, also known as street or industrial sweepers, are crucial pieces of equipment used in various industries for cleaning roads, parking lots, construction sites, and warehouses. These machines are designed to keep large surfaces free of debris, dust, and dirt, improving safety, hygiene, and overall operational efficiency. In this article, we will explore the different types of sweepers, their applications, features, and best practices for choosing and maintaining these versatile machines.
The Evolution of Sweeper Equipment
The concept of mechanized sweeping dates back to the late 19th century when street cleaning was done manually. Early sweeper machines were crude in design and often struggled with efficient debris collection. However, as urbanization grew, so did the demand for efficient cleaning solutions. The 20th century saw advancements in sweeper technology, with innovations such as the rotating broom, vacuum suction, and specialized filtration systems that could handle larger and more complex cleaning tasks.
Today, sweepers are a vital part of municipal maintenance and construction operations. They have evolved into highly specialized machines that are tailored for specific needs, ranging from light-duty sweeper vacuums used in warehouses to robust street sweepers capable of cleaning city streets.
Types of Sweepers
Sweeper equipment comes in several different configurations, each designed to meet specific cleaning needs. These types can be broadly categorized into:

1. Truck-Mounted Sweepers:
   Truck-mounted sweepers are heavy-duty machines designed for large-scale street cleaning. They are typically mounted on a truck chassis and feature a large hopper for collecting debris. These sweepers can be either mechanical broom sweepers or regenerative air sweepers.
   • Mechanical Broom Sweepers: These use rotating brushes to push debris into a central collection point, which is then loaded into a hopper. They are effective for cleaning larger debris but may not pick up finer particles as well as other systems.
     
   • Regenerative Air Sweepers: These sweepers use powerful air jets to lift debris off the road surface and into a vacuum system, where it is then collected. They are more efficient at picking up finer dust and dirt, making them ideal for cleaning urban streets.
     
2. Ride-On Sweepers:
   Ride-on sweepers are smaller, self-propelled machines designed for indoor and outdoor cleaning tasks. These sweepers are equipped with rotating brushes and vacuum systems, making them effective for sweeping floors, parking lots, and smaller roads.
   • Walk-Behind Sweepers: These are smaller and lighter than ride-on models and are ideal for cleaning smaller areas like warehouses or construction sites. They typically feature a smaller hopper and a manual pushing mechanism.
     
   • Battery-Powered Sweepers: Designed for indoor applications, these sweepers are quieter and more environmentally friendly. They are commonly used in warehouses and retail spaces.
     
3. Vacuum Sweepers:
   These sweepers are designed to clean fine particles and dust, which traditional broom systems might miss. Vacuum sweepers can be mounted on trucks or used as standalone machines. They are commonly used in environments with significant dust generation, such as industrial sites or areas with a lot of fine debris.
   
4. Tow-Behind Sweepers:
   Tow-behind sweepers are typically used for cleaning large outdoor areas like parks, parking lots, and construction sites. These machines are hitched to a vehicle and use rotating brushes or vacuums to sweep debris into a collection bin. Tow-behind models are often less expensive than ride-on sweepers and are suitable for less frequent cleaning needs.
   

1. High-Performance Brushes:
   Most sweepers are equipped with rotating brushes that move debris from the surface into a central collection area. The effectiveness of the brush system is crucial, as it determines how much debris the machine can pick up. Some models offer dual brushes for better coverage, while others feature side brushes for reaching corners and edges.
   
2. Efficient Vacuum Systems:
   Vacuum systems are essential for removing dust and smaller debris that the brushes cannot handle. Some sweepers feature high-powered suction that can pick up fine dust particles, while others offer regenerative air systems that clean efficiently without damaging the surface.
   
3. Dust Control Mechanisms:
   A major challenge in street sweeping is controlling airborne dust. Many modern sweepers come equipped with dust suppression systems that use water spray nozzles to reduce the amount of dust that gets kicked up during operation. These systems help ensure that the cleaned surfaces are not only free of debris but also free of harmful dust particles.
   
4. Compact and Versatile Design:
   Smaller, more compact sweepers are ideal for cleaning narrow paths, parking lots, or warehouse floors. These models are also often designed to be maneuverable, with features like adjustable side brushes and turning radii that allow them to reach tight spaces.
   
5. Ergonomic Controls:
   For operators, ease of use is a key consideration. Many modern sweepers come with ergonomic controls that minimize strain and improve comfort. These can include adjustable seats, easy-to-reach levers, and digital interfaces for managing sweeping modes, water usage, and other settings.
   
6. Fuel and Battery Efficiency:
   Sweepers, especially those with large engines or batteries, can consume a significant amount of power. Newer models focus on energy efficiency to minimize operating costs. Electric-powered sweepers, for instance, reduce emissions and noise while offering longer operating times on a single charge.
   

• Municipal Road Cleaning: Sweepers are primarily used by city governments to maintain cleanliness on streets, particularly in urban areas with heavy traffic. These machines are used regularly to clear streets of debris, litter, and pollutants.
  
• Industrial Sites and Warehouses: Sweepers are frequently used in warehouses, factories, and construction sites to clear dirt, dust, and debris that accumulate during operations. They help maintain a clean, safe working environment and ensure smooth operations.
  
• Parking Lots and Outdoor Areas: Sweeping equipment is used to maintain parking lots, private roads, and outdoor areas. Regular sweeping reduces the risk of slip-and-fall accidents and enhances the overall aesthetic appeal of the property.
  
• Specialty Cleaning in Sensitive Environments: Certain industries, such as food processing, pharmaceuticals, or electronics manufacturing, require extremely clean environments. Sweepers used in these settings are equipped with additional filters and dust-control features to maintain hygiene standards.
  

1. Area Size: If you're cleaning large roads or construction sites, a truck-mounted sweeper may be ideal. For smaller areas like warehouses, a compact ride-on or walk-behind sweeper may be more efficient.
   
2. Debris Type: Consider the type of debris you'll be cleaning. If you need to remove fine dust or small particles, a vacuum sweeper or regenerative air sweeper may be the best option. For large debris, mechanical broom sweepers can provide more thorough results.
   
3. Power Source: Decide whether you need a gas-powered, diesel-powered, or electric sweeper. Electric sweepers are environmentally friendly and quiet, while diesel-powered models offer more power for larger jobs.
   
4. Maintenance and Support: Ensure that the sweeper you choose comes with comprehensive after-sales support, including spare parts availability and a service plan. Regular maintenance is crucial for ensuring long-term reliability.
   

Defining the Role of a Backhoe in a Mixed Fleet
For contractors who already own excavators and dozers, adding a backhoe loader can seem redundant—until mobility and versatility come into play. Unlike tracked machines, backhoes can be driven short distances between jobs, reducing transport time and freeing up trailers. They also offer loader functionality, making them useful for cleanup, trenching, and light material handling. However, the decision to buy should be based on intended use, terrain, and seasonal workload, not just price.
Case 580D vs 580E and the Cummins Debate
The Case 580D and 580E are popular choices in the used market. The 580D features a Case-built engine, while the 580E introduced a Cummins four-cylinder diesel, which many operators prefer for parts availability and long-term reliability. Beyond the engine, the E model includes a priority valve hydraulic system, whereas the D uses a split pump design. The E also marked the beginning of factory 4x4 offerings, a feature that significantly improves loader performance in mud, snow, and sand.
Two-Stick Controls and Operator Preference
Older Case models often came with two-stick backhoe controls, which some operators find more intuitive than the later single-lever setups. While control layout is subjective, it’s worth testing both styles before committing. Machines with open cabs and basic controls tend to be easier to maintain but offer less comfort in cold or wet conditions.
4x4 and Extendahoe Considerations
Many buyers debate whether 4x4 and extendahoe features are necessary. For contractors who primarily use the backhoe for trenching or occasional loader work, 2WD may suffice. However, if the machine will be used in soft terrain or for frequent loading, 4x4 is invaluable. Extendahoe adds reach and reduces repositioning, especially when digging deep vaults or working around obstacles. While it adds complexity, many operators report minimal maintenance costs over years of use.
Customer Expectations and Business Strategy
Owning a backhoe can attract new clients—but it also creates expectations. Turning down backhoe-specific jobs may lead customers to seek other contractors for all services, including dirt work or grading. Some operators mitigate this by partnering with owner-operators or subcontractors to handle overflow or emergency calls. Others designate a family member or employee to manage backhoe tasks, ensuring responsiveness without overcommitting.
Deere 310C and Other Alternatives
The Deere 310C, contemporary to the Case 580K, is another solid option. Known for smooth hydraulics and reliable transmission, it competes well with Case models in the same era. Buyers should compare loader lift capacity, backhoe reach, and parts availability when choosing between brands.
Shuttle Shift and Transmission Repairs
Shuttle shift transmissions on older Case models are generally serviceable without full teardown. Unlike some JD dozers, the transmission can be accessed and rebuilt with moderate effort. Buyers should inspect for slipping, delayed engagement, or fluid leaks. Models like the 480F, 580E, and 680 offer different weight classes but share many drivetrain components, making parts sourcing easier.
Final Thoughts on Ownership
Buying a backhoe is not just about filling a gap—it’s about strategic deployment. If the machine will be used regularly, especially in off-season or short-distance jobs, it can save time and money. But if it risks pulling the operator into unwanted service calls or low-margin work, it may be better to subcontract or wait until staffing expands. For those with family members entering the business, a backhoe can be a gateway to new revenue streams and skill development.

The IHI 35N is a mini-excavator from IHI Construction Machinery, a company that has carved out a reputation for producing compact, efficient, and versatile construction equipment. The 35N model is part of IHI's line of compact excavators, designed to offer exceptional performance in tight spaces without compromising on power and capability. The compact size and maneuverability of the IHI 35N make it ideal for a wide variety of tasks, including landscaping, utility work, and even light demolition.
IHI's Legacy in Construction Equipment
IHI Construction Machinery, a subsidiary of IHI Corporation, has been developing construction equipment for decades. Based in Japan, IHI is known for its high-quality, durable machinery. Over the years, IHI has expanded its presence internationally, particularly in the mini-excavator sector, where it has earned a reputation for compact, efficient machines that can perform heavy-duty tasks in confined spaces. The IHI 35N is a testament to this expertise, combining precision engineering with practical features for both experienced operators and those new to construction equipment.
The Features of the IHI 35N Mini Excavator
The IHI 35N is designed to be a powerful, yet compact and easy-to-operate machine. It is equipped with a range of features that make it ideal for a variety of tasks:

1. Powerful Engine: The IHI 35N is equipped with a reliable engine that provides ample power for digging, lifting, and other heavy-duty tasks. The engine's output ensures that the machine can handle tough conditions while still maintaining fuel efficiency.
   
2. Hydraulic System: The excavator features a robust hydraulic system capable of powering attachments and operating the boom, arm, and bucket with precision. Its hydraulic performance ensures smooth operation during lifting, digging, and trenching tasks.
   
3. Compact Size: One of the standout features of the IHI 35N is its compact size, allowing it to work in spaces where larger machines cannot fit. Whether you're working in tight urban environments, alongside existing structures, or in smaller residential jobs, the 35N excels at providing the power of a larger excavator in a more nimble package.
   
4. Maneuverability: With its zero-tail-swing design, the IHI 35N can rotate within its own footprint, allowing for precise positioning and movement in confined spaces. This makes it perfect for jobs where access is limited or where large machinery simply won't fit.
   
5. Operator Comfort: IHI has designed the 35N with operator comfort in mind. The spacious cabin offers good visibility, ergonomic controls, and climate control to keep operators comfortable during long shifts. The layout of the controls is intuitive, which is especially beneficial for new operators.
   
6. Versatility: The 35N can handle a range of attachments, such as augers, breakers, and buckets, making it a versatile machine that can adapt to different job requirements. Its flexibility allows it to be used across multiple industries, from landscaping to light construction.
   

1. Hydraulic System Performance: Some users have noted that the hydraulic performance can diminish if the machine is not properly maintained, leading to slower response times and less efficient operation. Hydraulic fluid levels should be checked regularly, and any leaks should be repaired immediately to ensure the system is functioning optimally.
   Solution: Regular hydraulic system maintenance, such as fluid checks and filter replacements, is essential to keep the 35N’s performance consistent. Operators should ensure that there are no airlocks in the hydraulic system and that the oil is free of contaminants.
   
2. Track and Undercarriage Wear: Given the nature of the 35N’s work, the undercarriage is subject to significant wear, particularly if the machine is used in harsh conditions or on rough terrain. Track tension can be a concern, and if left unchecked, it can lead to premature wear and reduced traction.
   Solution: Regular inspection of the tracks and undercarriage is vital. Adjust the track tension as needed, and replace any worn-out parts to ensure smooth operation and longevity of the tracks.
   
3. Engine Performance: Like all machines, the engine of the IHI 35N can face issues related to air filters, fuel systems, and exhaust systems. Fuel delivery problems, dirty filters, and clogged injectors can cause engine performance issues, such as a loss of power or difficulty starting.
   Solution: Regular engine maintenance, including changing fuel filters, air filters, and ensuring proper exhaust flow, will help maintain engine performance. Additionally, using high-quality fuel and additives can improve the lifespan and efficiency of the engine.
   
4. Electrical System Failures: Electrical components, such as lights, gauges, and the battery system, are often subject to wear over time. Users have noted that occasional electrical failures, such as non-responsive gauges or problems with the starter, can occur.
   Solution: Regular inspection of the electrical components, including checking for corrosion on terminals, loose wiring, and the condition of the battery, is necessary. Keeping the electrical system clean and well-maintained will reduce the risk of failures.
   

1. Fluid Checks: Regularly check the engine oil, hydraulic fluid, and coolant levels to ensure that all systems are properly lubricated and cooled. Contaminants in the fluids can lead to system failure, so it’s essential to keep fluids clean.
   
2. Track Maintenance: Inspect the tracks and undercarriage regularly for wear. Adjust track tension as necessary, and replace any worn parts to prevent issues from escalating.
   
3. Routine Inspection: Check for any signs of leaks, wear, or damage, particularly around the hydraulics, tracks, and engine. Early detection of problems will help avoid costly repairs down the road.
   
4. Air and Fuel Filters: Change the air and fuel filters regularly to prevent clogging and ensure the engine operates at peak efficiency.
   

Sprocket Wear and Replacement in Compact Track Loaders
Sprockets are critical components in the undercarriage of compact track loaders (CTLs), transferring torque from the final drive to the track chain. Over time, sprocket teeth wear down due to constant engagement with track links, especially in abrasive conditions like sand, gravel, or demolition debris. Worn sprockets can cause premature track wear, misalignment, and loss of traction. Replacing sprockets at the right interval is essential to maintaining undercarriage integrity and reducing long-term costs.
Prowler’s Position in the Aftermarket Parts Market
Prowler is a U.S.-based manufacturer specializing in aftermarket rubber tracks, sprockets, rollers, and idlers for compact equipment. Their sprockets are designed to meet or exceed OEM specifications, often using hardened steel and precision machining to ensure proper fit and durability. Prowler has gained traction among independent mechanics and small fleet operators due to its competitive pricing and broad compatibility across brands like Bobcat, Case, John Deere, and Kubota.
Customer Feedback and Field Performance
While direct long-term data is limited, anecdotal reports suggest that Prowler sprockets hold up well under normal operating conditions. Customers have noted:

• Good fitment with minimal modification required
  
• Durable tooth profile that resists rounding under load
  
• Consistent engagement with track links, reducing slippage
  
• No premature cracking or weld failures after several hundred hours
  

• OEM sprockets: Typically offer the longest lifespan and best metallurgy but cost 30–50% more than aftermarket options.
  
• Other aftermarket brands: May vary in quality. Some use softer steel or inconsistent machining, leading to early wear or installation problems.
  
• Prowler: Positioned as a mid-tier option with reliable performance and cost savings.
  

• Replace sprockets and tracks together when possible to prevent uneven wear
  
• Torque bolts to spec and use thread locker to prevent loosening
  
• Inspect final drive seals during sprocket replacement
  
• Check alignment after installation to avoid side loading
  

The Caterpillar D5G is a well-respected and widely used dozer, part of Caterpillar’s renowned D-series line of track-type tractors. Known for its reliability, powerful engine, and excellent performance on a variety of terrain, the D5G has been a top choice for construction, mining, and heavy-duty earthmoving applications. Over the years, operators have come to rely on this machine for its durability and ability to handle tough jobs with ease. However, like all machinery, the D5G isn’t immune to mechanical issues that can arise over time. Understanding common problems and maintenance practices is essential to keeping the machine operating at its best.
The Development of the CAT D5G
The CAT D5G is part of Caterpillar’s D-series dozers, which have been in production for decades. Caterpillar, a company known for its innovation in heavy machinery, designed the D5G to offer an ideal balance of power, control, and maneuverability. The D5G is typically used for medium to large-scale operations and is favored for its ability to handle various tasks, from land clearing to finish grading.
Caterpillar has been producing dozers since the 1920s, and the D5G, introduced in the late 1990s, is part of a long lineage of reliable, heavy-duty equipment. The D5G is equipped with a turbocharged, 6-cylinder engine that delivers a significant amount of horsepower, making it suitable for applications like road construction, forestry, and site preparation. As part of the D5 series, it offers a good mix of horsepower, durability, and ease of use for operators.
Performance and Features
The CAT D5G dozer is known for its robust engine and reliable hydraulics. The dozer's power and versatility make it a go-to choice for various construction projects. Here are some key features and specifications that stand out:

1. Powerful Engine: The CAT D5G is equipped with a 6-cylinder turbocharged engine, which produces impressive horsepower for tasks requiring significant pushing power. Its engine size and power make it highly effective for medium-to-heavy-duty operations.
   
2. Hydraulic System: The hydraulic system of the D5G is designed to provide smooth operation, whether it’s moving large volumes of dirt or handling fine grading tasks. The hydraulics are capable of powering attachments, including rippers and blades, giving the machine greater flexibility.
   
3. Transmission: The dozer uses a power shift transmission, which is known for smooth shifting and reliable operation. This feature makes the D5G easy to operate and helps maintain optimal power distribution between the engine and tracks.
   
4. Track System: With its heavy-duty track system, the D5G excels in both traction and stability, even on rough and uneven surfaces. This makes it highly effective for tasks in forests, quarries, or other challenging environments.
   
5. Operator Comfort: Caterpillar designed the D5G with the operator in mind. The cab is spacious and well-equipped, providing excellent visibility and ergonomic controls for long shifts and reduced operator fatigue.
   

1. Transmission and Shifting Issues
   One of the most frequently mentioned issues with the CAT D5G involves the transmission system, particularly with shifting gears. Operators have reported difficulty with smooth gear transitions, especially under heavy loads. This can be caused by a variety of factors, including low hydraulic fluid levels, worn-out clutch packs, or issues with the transmission pump.
   Solution: Regularly check and maintain the hydraulic fluid and perform transmission fluid and filter changes at the recommended intervals. Inspect the clutch packs and gears for wear and replace them as necessary.
   
2. Hydraulic System Leaks
   Hydraulic leaks are another common issue with older D5G models. These can occur in various parts of the hydraulic system, such as hoses, cylinders, and pumps. Leaks can cause a loss of pressure, leading to inefficient operation and increased wear on other components.
   Solution: Inspect all hydraulic hoses and connections regularly for wear and tightness. Replace any damaged hoses or seals, and ensure the hydraulic fluid is at the correct level.
   
3. Cooling System Failures
   The CAT D5G, like many heavy-duty machines, relies on its cooling system to prevent engine overheating. Cooling system failures, such as clogged radiators or malfunctioning thermostats, can lead to engine overheating, potentially causing severe damage to the engine.
   Solution: Regularly clean the radiator and cooling fins to prevent debris buildup. Check the coolant levels and replace the coolant as recommended by the manufacturer to ensure proper engine cooling.
   
4. Electrical Problems
   Electrical issues, such as malfunctioning lights, starting problems, or faulty sensors, are not uncommon with the CAT D5G. These problems can be caused by corroded battery terminals, faulty wiring, or sensor malfunctions.
   Solution: Inspect the electrical system regularly, paying close attention to battery terminals, wiring, and fuses. Replace any corroded parts and ensure that all connections are secure.
   
5. Track Wear and Tear
   The tracks of the CAT D5G are subject to significant wear due to the machine’s frequent operation in rugged environments. Worn-out tracks can reduce the dozer’s traction, making it harder to move heavy loads and affecting its overall performance.
   Solution: Regularly inspect the tracks for signs of wear, such as cracking or excessive slack. Track maintenance, such as adjusting the track tension and replacing worn links, is crucial for maintaining optimal performance.
   

1. Regular Fluid Changes
   Regularly changing the engine oil, hydraulic fluid, and transmission fluid is critical to keeping the machine running efficiently. Use the correct type of fluid for each system and follow Caterpillar's recommended intervals for fluid changes.
   
2. Track Tension and Alignment
   Proper track tension is vital for maximizing the life of the tracks. Over-tightened tracks can lead to excessive wear on the undercarriage, while too-loose tracks can cause instability. Inspect and adjust the track tension regularly to ensure optimal performance.
   
3. Cooling System Checks
   Clean the cooling system frequently and check for signs of overheating. Ensure the radiator is free of debris, and check for any leaks in the system. Proper coolant levels should be maintained at all times.
   
4. Hydraulic System Maintenance
   Regularly check for hydraulic leaks and ensure that the system is functioning optimally. Replace hydraulic filters as needed and maintain proper fluid levels to ensure smooth operation of all hydraulically powered components.
   
5. Electrical System Inspection
   Ensure that all electrical components are in good working condition by regularly inspecting the wiring, fuses, and batteries. Prevent corrosion by cleaning and tightening the battery terminals regularly.