The Dezzi grader is a distinctive piece of road construction equipment that reflects both South African engineering ingenuity and the global demand for reliable earthmoving machinery. While not as internationally recognized as Caterpillar or Komatsu, Dezzi has carved out a niche by producing graders that are rugged, simple to maintain, and well-suited to challenging environments.
Company Background
Dezzi, officially known as Desmond Equipment, was founded in South Africa in the 1970s. Initially focused on agricultural implements, the company expanded into construction machinery to meet local demand for affordable and durable equipment. Unlike multinational corporations, Dezzi concentrated on building machines tailored to regional conditions, such as rough terrain and limited access to high-tech service facilities. By the 1990s, Dezzi graders had become common in municipal projects and private contracting across southern Africa, with sales numbering in the thousands.
Development of the Grader
Graders are essential for road building, maintenance, and mining operations. The Dezzi grader was designed to compete with larger brands by offering:

• A straightforward mechanical layout that reduced reliance on complex electronics.
  
• Locally sourced components to simplify repairs and parts availability.
  
• Heavy-duty frames capable of withstanding uneven terrain.
  
• Engines ranging from 120 to 180 horsepower, depending on the model.
  

• Moldboard: The large blade used to cut, spread, and level material.
  
• Circle drive: The mechanism that rotates the moldboard to different angles.
  
• Scarifier: A tool mounted ahead of the blade to loosen compacted soil or gravel.
  

• Municipal road maintenance in rural areas.
  
• Mining haul road construction.
  
• Agricultural land leveling.
  
• Small-scale infrastructure projects where cost efficiency was critical.
  

• Regular greasing of circle drive components to prevent premature wear.
  
• Upgrading hydraulic hoses with reinforced aftermarket options.
  
• Establishing local partnerships for parts distribution to reduce downtime.
  

The Case 580K backhoe loader is one of the most recognizable machines in the construction industry, often considered a workhorse for small contractors, municipalities, and farmers. For a new owner, understanding its history, technical features, and maintenance needs is essential to ensure reliable operation and long service life.
Development History
Case Construction Equipment, founded in 1842, began as a manufacturer of agricultural machinery before expanding into construction equipment in the mid-20th century. The 580 series backhoe loaders became iconic after their introduction in the 1960s. By the time the 580K was released in the 1980s, Case had already sold tens of thousands of units worldwide. The K-series represented a significant step forward, offering improved hydraulics, better operator comfort, and enhanced durability compared to earlier models. The 580K quickly became popular in North America and Europe, with sales figures reflecting its reputation as a dependable mid-sized backhoe loader.
Technical Characteristics
The Case 580K was equipped with a diesel engine producing around 75 horsepower, paired with a four-speed transmission. Its operating weight was approximately 14,000 pounds, and it could reach a digging depth of nearly 15 feet. The loader bucket capacity was about 1 cubic yard, making it suitable for a wide range of tasks from trenching to material handling.
Key terminology includes:

• Backhoe loader: A machine combining a front loader bucket with a rear digging arm.
  
• Hydraulic system: A network of pumps, hoses, and cylinders that powers the movement of the loader and backhoe.
  
• Stabilizers: Extendable legs that provide balance when digging with the backhoe.
  

• Hydraulic hoses cracking due to age.
  
• Loose stabilizer pads causing instability.
  
• Electrical wiring corroding in damp environments.
  
• Transmission wear from improper shifting.
  

• Replacing hydraulic hoses every 1,500 operating hours.
  
• Greasing pins and bushings regularly to prevent premature wear.
  
• Inspecting electrical connections and upgrading to modern sealed connectors.
  
• Training operators on proper shifting techniques to extend transmission life.
  

From Fixed Tooth To Power Grip
On many excavators and backhoes, the first “thumb” people add is a manual one: a welded-on structure with multiple adjustment holes and a heavy bar or pin that locks the thumb at a set angle. It is cheap, tough and simple. The trade-off is obvious — every time you want to change the thumb position, you have to climb off the machine, pull pins, wrestle steel, and hope the load hasn’t shifted.
Converting that same thumb to hydraulic control is a common upgrade. Instead of a rigid bar, a hydraulic cylinder moves the thumb, giving the operator the ability to open and close it directly from the cab. For many small contractors and landowners, this is one of the most game-changing modifications they ever do to a digging machine, especially when they handle logs, rocks, demolition debris or scrap daily.
Industry sales data shows that in North America and Europe, more than half of new 8–20 ton excavators are now sold “thumb-ready” or with factory thumbs and auxiliary hydraulics, because the productivity gain is so obvious in forestry, utility and landscape work. For older machines and owner-operators who bought used, retrofitting is often the only economical way to get that same capability.
The Thumb Itself Equipment History In Brief
The concept of an excavator thumb is relatively recent compared to the base machines. Hydraulic excavators took off in the 1960s and 1970s, with Japanese and European manufacturers pushing compact designs and American companies focusing on larger production models. Thumbs started appearing more widely in the 1980s and 1990s as contractors wanted their machines to behave more like giant hands instead of just shovels.
Aftermarket companies in North America saw the opportunity and began offering weld-on mechanical thumbs in mass quantities. Over time:

• Early thumbs were simple, fixed-position weldments.
  
• Next came multi-hole mechanical thumbs that could be set for different angles with a bar or pin.
  
• Today, hydraulic thumbs are common, often integrated into the stick design with matched linkage geometry and dedicated hydraulic circuits.
  

• Remove the rigid adjustment bar or locking link that holds the thumb in a fixed position.
  
• Install a hydraulic cylinder between the stick (or dipper) and the thumb.
  
• Connect that cylinder to a suitable hydraulic circuit with hoses and control valves.
  

• The cylinder stroke matches the thumb’s required motion.
  
• The fully extended and fully retracted cylinder positions do not bottom out internally before the thumb hits its physical stops.
  
• The hydraulic pressure is limited so the cylinder and thumb structure are not overloaded, especially when the bucket jams against the thumb.
  

• Thumb length
  Common compact backhoe thumbs are in the 24–36 inch range, with mid-size excavator thumbs often 36–48 inches.
  
• Cylinder bore and rod
  A 3 to 4 inch bore cylinder with a 1.5 to 2 inch rod is typical for small and mid-size machines. A 4 inch bore cylinder at 2,500 psi can exert over 31,000 lbf of push force, which is more than enough to damage a lightly built thumb if not properly limited.
  
• Stroke
  Stroke must be long enough to move the thumb through its useful arc, often 8–20 inches depending on the design. Over-stroke can cause the cylinder to bottom out internally before the thumb hits a stop, concentrating loads inside the cylinder and on the mounts.
  

• Set the thumb where you want it to be when fully open and fully closed relative to the bucket.
  
• Measure the distance between the proposed cylinder pin centers in both positions.
  
• Choose a cylinder where the eye-to-eye length at full retraction equals the “closed” distance plus some safety margin, and the eye-to-eye length at full extension matches the “open” distance while keeping the piston a small distance (for example, around 1 inch) away from its internal end.
  

• A base mount welded or bolted to the stick or dipper.
  
• A rod-end mount welded or bolted to the thumb body.
  

• Builders often weld a solid bar or stiffener between the gussets to keep the mount from splaying under side loads.
  
• Proper weld penetration and good joint preparation are more important than cosmetic bead appearance. It is common to weld, then peen the welds to relieve surface stress, especially in field conditions with old electrodes and less than ideal positioning.
  

• Pin holes should be sized and bushed properly. When thumbs are used to lift and clamp uneven loads (for example, unbalanced boulders or stumps), side-loads twist the structure and can elongate pin holes.
  
• Heavy wall tubing or DOM (Drawn Over Mandrel) tube makes excellent bushing material. Matching tube ID to pin OD closely reduces slop that would otherwise grow into oval pin holes after thousands of cycles.
  

• Factory auxiliary circuit
  Many modern machines have a hammer or auxiliary circuit with its own pedal or joystick button. This is often the cleanest solution for a thumb, if the circuit is bi-directional and pressure is appropriate.
  
• Stabilizer circuit on a backhoe
  On tractor-loader-backhoes, operators often repurpose one stabilizer circuit using a diverter valve. The stabilizers still function normally until the diverter is switched, after which the same control lever operates the thumb cylinder. Properly installed, this keeps the machine stable even when the circuit is switched, as the stabilizer cylinders stay locked in place.
  
• Front loader auxiliary valves
  Some machines have a 4-in-1 bucket or grapple function on the loader. Technically, a diverter could send that flow to the backhoe boom and thumb, but hose routing and the long distance involved often make this less attractive. More hose length means more cost and more potential failure points.
  
• Hammer circuit with mode selection
  Larger excavators with hammer circuits sometimes have a valve to switch between “hammer mode” (one-way flow with free return to tank) and “two-way mode” for attachments like thumbs or augers. When converting a manual thumb, checking for this mode selector is essential before adding costly valves.
  

• Dedicated cross-port reliefs (cushion valves)
  Installed directly in the lines feeding the thumb cylinder, these valves allow oil to cross internally or return to tank when pressure exceeds a set limit, for example around 2,000 psi on a machine whose main system runs 2,500–3,000 psi. This protects the cylinder and thumb structure and allows the thumb to move slightly instead of acting like a solid bar.
  
• External relief valves vented to tank
  Relief valves can be plumbed into each line to the thumb, with their tank ports tied into the return line of the main valve stack. When pressure exceeds the setpoint, they bypass flow to the tank, preventing over-pressure.
  
• Factory-integrated relief settings
  Some machines’ aux circuits already have adjustable relief valves in or near the control blocks, sometimes under protective caps. Verifying these settings with a pressure gauge before committing to major changes is critical. If the hammer circuit is strictly one-way with no separate relief, using it directly on a thumb can be risky unless modifications are made.
  

• Stretch and mushroom pin holes.
  
• Slightly bend cylinder rods.
  
• Deform mounting plates and gussets.
  

• Manual diverter valves
  A small lever-operated valve near the operator’s position can switch flow from, for example, stabilizers to the thumb. Once flipped, the same stabilizer control lever now opens and closes the thumb. Most diverters stay where they are set rather than springing back, which is convenient when doing a lot of thumb work.
  
• Foot pedals
  Excavator hammer circuits are often controlled by a foot pedal. In two-way mode, the pedal can extend or retract a thumb cylinder. Some pedals have a lock or latch to hold them in one direction for continuous flow to a hammer; for thumbs, free movement in both directions is preferred.
  
• Joystick buttons or proportional rollers
  On newer machines, thumb control is often wired into a joystick rocker switch or proportional roller, giving the operator fine control while still manipulating the boom, stick and bucket.
  

• Movement paths
  The two hoses to a thumb cylinder, plus any existing hoses to auxiliary attachments, must move through a full range of boom and stick motion without stretching, rubbing or kinking.
  
• Bundling strategy
  Sometimes it is better to run four hoses in a single bundle; other times splitting them into two smaller bundles reduces chafing. Sharp hose clamps directly on hose jackets can cut into the cover under vibration. Many mechanics prefer spiral wrap, fabric sleeves or old pieces of radiator/suction hose as protective sheaths over groups of hoses.
  
• Pinch points
  Areas where hoses might get caught between cylinder guards, cab structures or boom sections should be carefully studied with the machine fully curled in and extended. It is common to temporarily clamp hoses, operate the machine slowly through its full range, observe the motion, then make final adjustments.
  

• No more climbing off the machine to adjust thumb position
  This is not just about convenience; reducing cab exits cuts slip-and-fall risk, especially on muddy jobsites or icy steps.
  
• Fine grip control
  Operators can feather the thumb pressure, gently gripping irregular objects, aligning culvert pipes or placing boulders in landscape walls.
  
• Faster work cycles
  Each grab-haul-release cycle is quicker when the thumb can be repositioned mid-motion instead of being locked at one angle.
  

• Cylinder too large
  A cylinder with an oversized bore can make the thumb stronger than the bucket linkage or the thumb frame, increasing the chance of structural damage. Choosing a bore that gives “enough but not crazy” force, and using relief valves, is safer.
  
• No relief protection
  Relying solely on main system reliefs when using hammer circuits or repurposed lines can expose the thumb cylinder to sudden shocks when the bucket jams against it.
  
• Weak mounts and welds
  Thin plates, short gussets and poor weld penetration are quickly punished by side loads and twisting forces. Reworking mounts later is harder than over-building them from the start.
  
• Hose chafing and poor clamps
  Using sharp metal clamps directly on hoses, running hoses across edges without protection, or bundling them in ways that force them to rub at each cycle leads to early failures.
  

• Size the cylinder based on measured geometry and realistic load expectations.
  
• Add cross-port or external relief valves set below full system pressure.
  
• Use thick mounts, gussets and good welding, with bushings on all high-load pins.
  
• Protect hoses with sleeves, spiral wrap and carefully designed routing.
  

• Verify whether the machine already has a suitable aux or hammer circuit, and whether it can be set for two-way flow and has built-in relief.
  
• Decide whether to use a stabilizer circuit (backhoe) or an existing aux circuit (excavator) with a diverter valve.
  
• Carefully mock up cylinder locations and measure pin-to-pin distances at open and closed thumb positions.
  
• Choose a cylinder with an appropriate bore, rod and stroke, leaving 10–25 mm of piston travel unused at each end to avoid internal bottoming.
  
• Design and fabricate robust mounts with gussets and bushings, using high-quality welding.
  
• Install cross-port or external relief valves in the thumb circuit, setting pressure below main system levels.
  
• Plan hose routing, test through the full range of motion, and protect hoses with sleeves and proper clamps.
  
• Start with moderate thumb pressure and gradually increase if necessary, watching the structure for signs of strain.
  

Photographs of heavy equipment from past decades are more than nostalgic images; they are historical records that reveal the evolution of machinery, industry, and society. These old pictures capture the rugged machines that built highways, dams, and cities, and they remind us of the engineering milestones that shaped modern infrastructure.
The Rise of Heavy Equipment Photography
In the mid-20th century, documenting construction projects became a common practice. Companies often hired photographers to record progress, not only for technical purposes but also for promotional material. These images showcased bulldozers, cranes, and loaders in action, highlighting their power and efficiency. For historians, such photographs provide insight into working conditions, safety standards, and the scale of projects undertaken during that era.
Development of Iconic Machines
Several machines frequently appear in old photographs, each representing a breakthrough in engineering:

• Caterpillar D9 bulldozer, introduced in the 1950s, became a symbol of earthmoving power.
  
• Euclid dump trucks, widely used in mining, set benchmarks for hauling capacity.
  
• Manitowoc cranes, with their lattice booms, dominated large-scale lifting operations.
  
• John Deere loaders, particularly the 644 series, gained popularity in municipal and industrial projects.
  

• Crawler tractor: A tracked machine designed for pushing or pulling heavy loads.
  
• Hydraulic excavator: A digging machine powered by hydraulic fluid, offering precision and strength.
  
• Lattice boom crane: A crane with a boom made of steel lattice sections, providing strength with reduced weight.
  

• Digitizing photographs to ensure long-term preservation.
  
• Creating online databases for researchers and enthusiasts.
  
• Encouraging equipment manufacturers to maintain historical archives.
  

A Remote Job In The Late 1960s
In the late 1960s, a small road-building crew was working in some of the most unforgiving terrain on Earth: the steep, landslide-prone mountains of Papua New Guinea. The photographs from that time are grainy and weathered, but they capture a slice of engineering history that was repeated all over the developing world after World War II — pushing roads into places where previously only footpaths and river canoes could reach.
The operator in these stories was tasked with reopening a mountain road that had been carved a few years earlier by a large bulldozer, likely a Caterpillar D7-class machine. At that time, the D7 series was a workhorse for heavy earthmoving. Developed during the 1930s and widely deployed in World War II for military road and airstrip construction, the D7 and its successors went on to sell tens of thousands of units worldwide. They were known for a good balance between power, weight and maneuverability, which made them common choices for forestry, mining and remote road construction.
Several years after the original road was cut, repeated wet seasons had triggered landslides that completely buried long sections of the track. The new crew’s mission was not to build a highway from scratch, but to reclaim a vanished road from beneath tons of unstable soil and rock.
A Razor-Back Ridge And A Braided River
One image shows a long, narrow ridge dropping down to a braided river. A braided river is a type of stream that splits into many shallow channels weaving around sandbars and gravel islands. These rivers usually indicate a high sediment load and variable flows. In mountain regions, they are often fed by intense rainfall and steep gradients.
To reach the blocked sections of road, the operator had to climb up what he described as a “razor-back” ridge — a narrow spine of ground with steep drops on either side. Working a dozer on such a ridge is not just a matter of skill but also of judgment: one poorly planned push can destabilize the slope below, causing a slide that takes machine, operator and track down with it.
From that precarious ridge, he started clearing the landslides that had buried the older bench road. Benching is the process of cutting a flat or gently sloping shelf into the side of a hill so that a road, track or terrace can be built. When you look at mountain roads that snake along a slope, what you’re really seeing is a series of benches carved into a hillside, step by step.
Why Cutting Downhill Is Safer
One of the key techniques described from this job is the idea of cutting downhill when benching. On steep, unstable slopes, working from the top down offers several advantages:

• You can see what the material is doing below you as you cut.
  
• Spoil (waste soil and rock) naturally moves down the slope, reducing the risk of it piling up dangerously above the machine.
  
• If a small slide starts under the cut, there’s often a chance to back away or let the material go, as opposed to pushing from below and undermining yourself.
  

• Annual or seasonal rainfall well above 2,000–3,000 mm
  
• Steep slopes, sometimes exceeding 30–40 degrees
  
• Highly weathered rock and deep soil profiles
  
• Previous excavation for roads, pipelines or logging tracks
  

• Grade
  The slope of the road, usually stated as a percentage. Heavy trucks on dirt roads are often limited to grades of 8–12% for safety and traction.
  
• Curve radius
  Sharp corners are risky for long vehicles and can cause rollovers or loss of control. But space for gentle curves is often lacking.
  
• Bench width
  The width of the cut into the hillside must be enough for the road and a safety margin. On very steep ground, cutting a wide bench means removing a huge volume of material.
  
• Switchbacks
  On very steep slopes, switchbacks — tight hairpin turns where the road reverses direction — become mandatory. But finding enough flat real estate for a safe switchback on a cliff-like hillside can be nearly impossible.
  

• Pattern recognition
  After thousands of hours in the seat, operators start to “feel” when a slope is unsafe, when a machine is over-leaning, or when the ground is starting to move under them.
  
• Improvised solutions
  Old pictures often show techniques that aren’t in textbooks: building small safety berms with a blade, packing fill in layers by feel, or choosing a slightly different line on a slope because of a subtle change in soil color or moisture.
  
• Understanding local conditions
  In places with monsoon seasons, volcanic soils or permafrost, local experience can matter as much as calculations. An operator who has lived through several wet seasons knows where the earth is likely to fail first.
  

• Geotechnical assessment
  Whenever possible, conduct at least a basic soil and rock survey. Identify layers prone to sliding, such as clay lenses or weathered shale.
  
• Drainage first
  In high rainfall areas, water management can be more important than the initial cut. Side ditches, cross-drains, culverts and surface shaping help prevent water from saturating slopes.
  
• Controlled benching
  Work in small increments, especially on steep or unknown ground. Avoid undercutting existing slides from below.
  
• Monitoring for movement
  Watch for cracks on the uphill side, fresh scarps, leaning trees, or small rockfalls. These can be early warning signs of a larger failure.
  
• Phase planning
  Accept that some sections will need rebuilding. Plan for maintenance crews, access to fill material and safe turnaround points for equipment.
  

• How remote roads were built before GPS, laser levels and modern safety standards
  
• What it feels like to guide a heavy machine along a knife-edge ridge
  
• How entire road networks can be erased and rebuilt repeatedly by landslides
  

• Respect the landscape
  Steep, wet terrain never stops trying to return to its natural shape. Every cut is temporary unless constantly maintained.
  
• Combine old instincts with new tools
  Modern projects have access to satellite imagery, drones, slope stability software and more. But the judgment of an experienced operator is still irreplaceable.
  
• Design for failure and recovery
  In regions with intense rainfall and unstable geology, plan from the start for washouts and slides. Build in alternative access, stockpile fill and keep machines available for emergency repairs.
  
• Value long-term memory
  Veterans who worked in the 1960s, 70s and 80s saw the same slopes fail multiple times. Their stories can prevent repeated mistakes on new projects.
  

The Caterpillar RT100 telehandler is a machine that represents a unique chapter in the history of material handling equipment. Built during a period when Caterpillar was expanding its product line beyond traditional earthmoving machinery, the RT100 was designed to meet the growing demand for versatile lifting solutions in construction, agriculture, and industrial applications. Although not as widely known as Caterpillar’s loaders or excavators, the RT100 remains a subject of interest for operators and collectors due to its distinctive design and operational quirks.
Development History
Caterpillar, founded in 1925, became synonymous with heavy-duty construction equipment. By the late 1980s and early 1990s, the company sought to diversify into telehandlers, machines that combine the lifting capacity of a forklift with the reach of a crane. The RT series was part of this effort, with the RT100 being one of the larger models. It featured a telescopic boom capable of lifting several tons to significant heights, making it suitable for tasks such as placing materials on multi-story buildings or handling loads in uneven terrain. While Caterpillar sold thousands of telehandlers globally, the RT series was eventually phased out as the company shifted focus to partnerships with other manufacturers and newer designs.
Technical Characteristics
The RT100 was powered by a diesel engine producing around 100 horsepower, paired with a robust hydraulic system. Key specifications included:

• Maximum lift capacity of approximately 10,000 pounds.
  
• Lift height exceeding 40 feet.
  
• Four-wheel drive for rough terrain performance.
  
• Side-mounted boom design for improved visibility.
  

• Telehandler: A telescopic handler that combines forklift functionality with crane-like reach.
  
• Hydraulic cylinder: A device that uses pressurized fluid to extend or retract the boom.
  
• Stabilizers: Outriggers that provide additional stability when lifting heavy loads at extended reach.
  

• Regular inspection of hydraulic hoses and seals, replacing them every 1,500 operating hours.
  
• Upgrading electrical wiring with modern insulation to prevent shorts.
  
• Using aftermarket suppliers or fabricating custom parts when original Caterpillar components are unavailable.
  

Overview Of The New Holland C175
The New Holland C175 is a mid-size compact track loader designed for contractors and property owners who need strong lifting performance without moving up to a full-size crawler. Built in the late 2000s, it sits in the 60 horsepower class, with an operating weight of roughly 3.4 tonnes (about 7,500 lb), which makes it easy to transport on a typical dual-axle equipment trailer while still handling serious work such as grading, backfilling, material handling, and light land clearing.
This machine uses a vertical-lift linkage, giving it good reach at maximum height for loading trucks and hoppers. Paired with rubber tracks and relatively low ground pressure (around 5–6 psi depending on track width), it is well suited for soft or muddy conditions where wheeled skid steers struggle.
Engine And Powertrain
Under the rear hood, the C175 usually carries a Shibaura-built diesel (marketed under New Holland branding), model N844LT, a 4-cylinder turbocharged engine:

• Displacement about 2.2 L
  
• Gross power around 60 hp
  
• Net power about 56 hp
  
• Peak torque roughly 170–175 N·m at about 1,700 rpm
  

• Low range for pushing, grading, and precision work, around 9–10 km/h
  
• High range for travel, often listed near 12 km/h
  

• Standard hydraulic flow about 17 gpm (≈ 65 L/min)
  
• System relief pressure around 2,600 psi (≈ 180 bar)
  

• General buckets (dirt, snow, multipurpose)
  
• Pallet forks
  
• Augers
  
• Light hydraulic breakers
  
• Brush grapples
  
• Power rakes and brooms
  

• Operating weight around 7,500 lb (≈ 3,400 kg)
  
• Rated operating capacity about 2,200 lb (≈ 998 kg)
  
• Bucket capacity roughly 0.5 m³
  
• Overall width over tracks about 1.8 m
  
• Transport length with bucket around 3.3 m
  
• Height to cab top roughly 1.9–2.0 m
  

• It can load small and medium dump trucks from one side.
  
• It remains compact enough to work in tight residential yards.
  
• It spreads its weight well, keeping ground pressure low enough for turf protection, especially with wider tracks.
  

• Three bottom rollers per side
  
• Rubber tracks with around 13–16 inch widths depending on configuration
  
• Track length on ground about 1.5 m
  
• Track gauge around 1.5 m
  

• 320 × 86 × 50 (about 12.6" wide)
  
• 400 × 86 × 50 (about 15.7" wide)
  

• Maintaining proper track tension
  • Too tight: accelerates wear on rollers and idlers, increases power consumption.
    
  • Too loose: increases risk of de-tracking, particularly when turning on slopes or in mud.
    
• Cleaning the undercarriage daily in muddy or freezing conditions.
  
• Inspecting rollers and idlers for leaking seals or seized bearings.
  
• Checking sprocket teeth for hooking or sharp points.
  

• ROPS/FOPS cab, with optional fully enclosed cab and heat/AC
  
• Mechanical or air-suspension seat
  
• Pilot or mechanical hand controls, sometimes with foot pedals for auxiliary functions
  
• Large front door and side windows for visibility around the bucket and tracks
  

• Residential and commercial landscaping
  • Grading yards, spreading topsoil or gravel
    
  • Building retaining walls and moving block pallets
    
  • Installing sod with low turf damage due to low ground pressure
    
• Construction and utilities
  • Backfilling trenches
    
  • Carrying pipe, pallets of block, and trench boxes
    
  • Working in wet or recently disturbed subgrades where wheeled machines sink
    
• Agriculture and farm maintenance
  • Cleaning livestock areas
    
  • Handling feed and bedding
    
  • Maintaining driveways and farm lanes
    

• Cooling system
  • Radiators and coolers can pack with dust, chaff, or fine material.
    
  • Regular cleaning with low-pressure air or water is crucial to avoid overheating.
    
• Hydraulics
  • Contamination from dirty quick couplers or torn hoses can damage valves and pumps.
    
  • Following fluid and filter change intervals is a relatively cheap insurance policy.
    
• Electrical system
  • Corroded connectors around the footwell or under the cab can cause intermittent control issues.
    
  • Keeping connectors dry and protected reduces downtime.
    
• Undercarriage
  • Track tension checked weekly, or daily in severe conditions.
    
  • Prompt replacement of worn rollers prevents more expensive component damage.
    

• Extend the proven skid steer platform onto tracks.
  
• Offer improved flotation and traction.
  
• Maintain compatibility with a large range of skid steer attachments.
  

• Engine
  • Cold start: does it fire quickly without excessive white or blue smoke?
    
  • Listen for knocks or abnormal turbo sounds.
    
• Hydraulics
  • Operate boom and bucket to full travel repeatedly.
    
  • Check for chatter, slow response, or obvious leaks.
    
• Drive system
  • Drive forward, reverse, and make full turns both directions.
    
  • Listen for grinding or whining; note any loss of power on one side.
    
• Undercarriage
  • Inspect track lugs, edges, and inner guide area for tears or severe wear.
    
  • Check rollers and idlers for oil leaks or rough movement.
    
• Frame and structure
  • Look for weld repairs on the boom, loader arms, or main frame.
    
  • Check the coupler for excessive play.
    

The John Deere 644BA wheel loader represents a transitional stage in the evolution of heavy machinery, bridging the gap between earlier B-series loaders and the more advanced models that followed. This machine, introduced in the late 1970s and refined through the early 1980s, was designed to meet the growing demand for reliable earthmoving equipment in construction, mining, and municipal projects.
Development History
John Deere, founded in 1837, initially focused on agricultural equipment but expanded into construction machinery in the mid-20th century. By the 1970s, the company had established itself as a major player in the wheel loader market. The 644 series was first introduced in the early 1970s, and the BA variant was a refinement of the B model. The BA incorporated incremental improvements in hydraulics, operator comfort, and durability. Sales of the 644 series were strong, with thousands of units delivered worldwide, particularly in North America where infrastructure expansion demanded versatile loaders.
Differences Between B and BA Models
Operators often ask about the differences between the 644B and 644BA. While both shared the same basic frame and engine platform, the BA introduced several enhancements:

• Improved hydraulic pump efficiency, allowing smoother bucket operation.
  
• Reinforced articulation joints for longer service life.
  
• Updated cab design with better visibility and noise reduction.
  
• Minor electrical system upgrades to reduce fuse failures.
  

• Articulation joint: The central hinge that allows the loader to pivot, improving maneuverability.
  
• Hydraulic pump: A device that converts mechanical energy into hydraulic pressure, powering the loader’s arms and bucket.
  
• Operating capacity: The maximum load the machine can safely carry, typically around 3 cubic yards for the 644BA.
  

• Regular greasing of articulation joints to prevent premature wear.
  
• Replacing hydraulic hoses every 2,000 operating hours.
  
• Inspecting wiring harnesses for abrasion and securing them with protective sleeves.
  
• Using genuine John Deere filters and fluids to maintain system integrity.
  

Why Scrap Metal Etiquette Matters
On construction and demolition sites, scrap metal is everywhere: old copper pipe, cast iron fittings, discarded steel beams, aluminum siding, and the occasional heavy motor or machine part. With global steel production exceeding 1.8 billion tons per year and recycled metal often contributing 30–40% of that input, scrap is not just trash but a real commodity. Even on small projects, the value of recovered copper, aluminum, and steel can easily reach hundreds or thousands of dollars over time.
Because scrap has real monetary value, the question of “who owns it” can create tension between property owners, contractors, operators, and laborers. Getting the etiquette wrong can damage working relationships, cost people money, and in some cases cross legal lines. Getting it right can turn scrap into a fair bonus, a team-building tool, or a way to offset project costs.
Who Technically Owns Scrap Metal
From a legal perspective, the default rule is usually straightforward:

• The property owner is considered the primary owner of anything on the site, including scrap, unless a contract clearly states otherwise.
  
• If a contractor is hired to demolish, remodel, or excavate, ownership of scrap may transfer if:
  • It is written into the contract that the contractor keeps all salvage and scrap.
    
  • The owner explicitly states that they do not want it and transfers rights.
    

• The owner can decide:
  • To keep all scrap and cash it in.
    
  • To let the contractor have it.
    
  • To let workers or operators take specific items.
    

• Estimate the approximate weight and type of recoverable metals:
  • Structural steel
    
  • Copper wiring and bus bars
    
  • HVAC units with copper and aluminum coils
    
  • Stainless steel tanks and piping
    
• Use market prices to estimate potential revenue.
  
• Deduct that expected value from their bid to offer a lower price to the client.
  

• Several large air-conditioning units
  
• Multiple runs of copper pipe, sometimes up to 6 inches in diameter
  
• Thousands of pounds of copper wire, bus bars, and grounding bars
  

• The contractor owns the scrap.
  
• Employees do not have the right to peel off copper, motors, or other pieces unless the owner or contractor explicitly grants permission.
  
• Any “side business” in scrap by crew members is considered stealing, even if it feels like “found money” to the person grabbing it.
  

• A few old steel pipes unearthed during excavation
  
• A rusted furnace found in a backfilled basement
  
• An abandoned metal garage door
  
• Off-cuts of aluminum gutter from a roofing job
  
• Short ends of decking, rebar, or conduit
  

• Many site owners or general contractors see minor scrap as a nuisance.
  
• They may be happy to let a conscientious worker or operator collect and cash it in.
  
• The key is that permission should be clear, not assumed.
  

• The person who dug it up gets it.
  
• The lowest-paid worker or apprentice is allowed to keep it as a perk.
  
• The crew splits the proceeds as a team bonus.
  

• Collect all scrap from a job.
  
• Cash it in at the end of the week.
  
• Split the money into two halves:
  • One half goes into a “crew fund” for coffee, food, or shared items.
    
  • The other half is divided equally among the workers on that job.
    

• The material technically came from the site.
  
• Multiple people contributed to the work.
  
• Small amounts of money can still help morale and team spirit.
  

• On a school demolition, a small crew removed underground copper water lines, grounding wires, and interior plumbing. After scrapping the material and splitting the money, they used part of the proceeds for shared food and evenly divided the rest. Everyone involved felt the outcome was fair because the arrangement was agreed upfront and the material was clearly scrap.
  
• On another project, a worker quietly cleaned out a backhoe bucket full of cast iron over a weekend, scrapping it for personal gain, even though he had not done the digging. The operator who had unearthed the metal felt this crossed the line. There had been no general agreement that “anyone can take whatever they see,” and the removal felt like theft of effort and opportunity.
  
• On a grading job, an excavator operator uncovered about 100 feet of abandoned 8-inch cast iron waterline. The site owner just wanted the job done and had no interest in the metal. The landscaper managing the work did not want to deal with hauling and scrapping it. The operator was then explicitly told he could keep it. In that scenario, the etiquette and ownership were clearly defined, and everyone walked away satisfied.
  

• On certain union jobs, it may be customary for:
  • The apprentice or lowest-paid worker to receive scrap as a traditional perk.
    
  • Crews to split scrap proceeds according to seniority or hours worked.
    
• On some sites, the operator who does the pulling, digging, or cutting is understood to have first claim on scrap, subject to the owner’s approval.
  
• Some companies openly discourage any personal scrap collection to avoid arguments, theft, and safety issues around handling materials.
  

• Ask the foreman or site supervisor what the company’s rules are.
  
• Avoid “helping themselves” until expectations are clearly explained.
  
• Understand that what is normal on one crew may be unacceptable on another.
  

• Wood off-cuts
  
• Aluminum siding and trim
  
• Steel scrap
  
• Packaging and other materials
  

• Taking scrap out of those containers without permission is considered stealing from the recycler, not from the original owner.
  
• The correct etiquette is:
  • Ask the site owner or general contractor first.
    
  • If they have a formal agreement with the recycler, you need permission from both to take anything.
    

• Heavy copper components from furnaces or casting equipment
  
• Specialty alloys mixed with waste materials
  
• Periodic loads that contain unusually valuable metals
  

• Default ownership
  • Scrap belongs to the property owner unless a contract says otherwise.
    
• Written agreements
  • The cleanest arrangement is when contracts specify whether the contractor:
    • Owns all salvage and scrap, or
      
    • Must leave valuable items for the owner.
      
• Verbal arrangements
  • Can work when trust is high and amounts are small.
    
  • May not hold up if a dispute reaches court.
    
• Transparency
  • Asking permission and being up front about intentions is always better than assuming.
    
• Fairness
  • Splitting money with the crew or using scrap proceeds for shared benefits builds goodwill.
    
• Safety
  • Scrap collection must not interfere with safe operations, personal protective equipment, or proper disposal of hazardous materials.
    

• For property owners:
  • Decide in advance whether you care about scrap revenue.
    
  • If you want to keep it, put that clearly into the contract and communicate it.
    
  • If you do not care, formally grant scrap rights to the contractor or crew to avoid confusion.
    
• For contractors:
  • If you plan to factor scrap value into your bid, state that clearly in writing:
    • “All scrap and salvage become the property of the contractor.”
      
  • Explain to your crew whether personal scrap collecting is allowed or not.
    
  • Consider using small-value scrap proceeds as a crew benefit rather than personal profit.
    
• For equipment operators and laborers:
  • Always ask before taking any scrap, even if it looks like trash.
    
  • Do not remove items from company scrap bins or third-party containers without explicit permission.
    
  • If you participate in a shared scrap arrangement, keep simple records of proceeds to avoid arguments.
    
• For everyone:
  • Treat scrap as a shared opportunity, not a secret side hustle.
    
  • Remember that a few dollars today are rarely worth damaging relationships or reputations.
    

• A way to reduce environmental impact.
  
• An opportunity to lower project costs.
  
• A potential source of bonuses or shared benefits among workers.
  

The Bobcat 753 skid steer loader, produced around the late 1990s and early 2000s, remains one of the most widely used compact machines in construction and landscaping. Despite its reliability, operators often encounter fuel delivery issues that can cause the machine to stall after a short period of operation. Understanding these problems requires not only a look at the mechanical components but also the history of the equipment and the company behind it.
Development of the Bobcat 753
Bobcat, originally founded in the 1950s in North Dakota, revolutionized compact equipment with the invention of the skid steer loader. By the year 2000, the 753 model had become a staple in the lineup, offering a 46-horsepower diesel engine, a rated operating capacity of about 1,300 pounds, and a 30-gallon fuel tank. Sales of Bobcat machines had reached hundreds of thousands worldwide, cementing the brand as a leader in compact construction equipment. The 753 was particularly popular for snow removal, small construction sites, and agricultural tasks due to its maneuverability and durability.
Common Fuel Delivery Issues
Operators reported that the machine would run for approximately twenty minutes before shutting down, only restarting when the fuel tank was completely refilled. This symptom strongly suggests a broken or disconnected fuel pickup tube inside the tank. The pickup tube is responsible for drawing fuel from the bottom of the tank; when it breaks or detaches, fuel can only be accessed when the tank is full.
Technical terminology worth noting includes:

• Pickup tube: A flexible or rigid tube inside the fuel tank that channels fuel to the engine.
  
• Strainer screen: A small filter at the end of the pickup tube that prevents debris from entering the fuel system.
  
• Solenoid: An electromechanical device that controls fuel flow by opening or closing valves when energized.
  

• Replacing the pickup tube, strainer, and grommet seal with genuine parts.
  
• Ensuring the replacement tube is weighted properly so it reaches the bottom of the tank.
  
• Inspecting wiring harnesses for abrasion and securing them with protective sleeves.
  
• Testing solenoids for proper current draw and replacing them if readings are abnormal.