The Komatsu D135A‑2 is part of a venerable family of mid‑ to large‑size crawler dozers built by Komatsu Ltd., one of the world’s leading manufacturers of construction and mining equipment. Komatsu’s history traces back to the early 20th century and over decades grew into a global enterprise, ranking among the top producers of heavy machinery alongside Caterpillar and Volvo. The D135A‑2, built in the early 1990s, sits in the 32–36 ton operating weight class and was designed for demanding earthmoving tasks such as heavy grading, cut‑and‑fill work, and general site preparation. Its reliability and durability made it a common sight in contractors’ fleets around the world.
Over time, as machines age and accumulate hours — often well beyond 10,000 engine hours on good examples — routine systems such as the engine oil pressure regulation can present anomalies. Understanding the causes, implications, and remedy for engine oil pressure concerns is essential to keeping an older Komatsu D135A‑2 productive and minimizing unscheduled downtime.
Engine Oil Pressure Fundamentals
Engine oil pressure is a key indicator of the lubrication system’s health. It ensures critical components such as bearings, camshaft lobes, piston pins, and turbochargers receive a steady supply of pressurized oil. Typical oil pressure in heavy‑duty diesel engines is dependent on RPM and engine temperature:

• At idle — roughly 10–30 psi (0.7–2.1 bar).
  
• At operating speed — often 40–70 psi (2.8–4.8 bar) under normal conditions.
  

• Oil Pressure Sender/Sensor — An electronic unit that reports oil pressure to the gauge or controller.
  
• Oil Pump — Engine‑driven pump that delivers pressurized oil to the engine’s lubrication circuits.
  
• Relief Valve — A spring‑loaded valve that regulates maximum oil pressure, protecting the pump and passages from over‑pressure.
  
• Bearings Clearance — The gap between bearing surfaces and journals; excessive clearance lowers oil pressure.
  

• Low or fluctuating oil pressure at idle or low engine RPM.
  
• Normal pressure at higher RPM but dramatic drop at idle.
  
• Warning alarms or shutdown triggers from pressure sensors.
  
• Oil pressure differences between cold start and hot operating conditions.
  

• Gear teeth can wear down, reducing pumping efficiency.
  
• Relief valve springs can weaken, dropping pressure earlier than designed.
  
• Valve seats can collect debris, causing improper seating and pressure regulation.
  

• Verify with a mechanical gauge — Compare against the machine’s instrument reading to rule out sensor errors.
  
• Check oil level and condition — Low oil or milkiness (indicating water contamination) signals problems requiring immediate attention.
  
• Observe pressure at idle and higher RPM — Chart readings at known RPMs to spot patterns.
  
• Inspect oil filter and pickup screen — Blockages here directly reduce oil available to the pump.
  

• Follow regular oil and filter change intervals — many fleets change oil every 250–500 hours depending on duty cycle.
  
• Always verify concerns with a mechanical gauge, especially when the machine’s age suggests potential sensor drift.
  
• Adjust oil viscosity for climate and operating conditions; do not assume one grade fits all seasons.
  
• Document pressure readings over time to identify gradual trends, not just immediate spikes or drops.
  

The Case 70XT skid steer represents a transitional period in the evolution of compact loaders, when manufacturers were shifting from purely mechanical control systems to hybrid mechanical‑electronic designs. This model, part of Case’s XT series, became popular for its reliability, straightforward maintenance, and strong hydraulic performance. However, because Case offered multiple control configurations, owners of used machines often encounter confusion about auxiliary hydraulic controls, especially when joysticks include switches that appear functional but are not connected to the installed hydraulic system.
Understanding how the auxiliary system was configured from the factory is essential for diagnosing control issues and determining whether a conversion from foot‑operated to hand‑operated auxiliary control is feasible.
Development Background of the Case XT Series
Case introduced the XT series in the early 2000s as an upgrade to the 1800 series. The goal was to modernize the operator environment while retaining the rugged mechanical simplicity that made Case skid steers popular among contractors, farmers, and landscapers.
Key improvements included:

• Redesigned operator cab with better visibility
  
• Updated hydraulic systems with higher flow options
  
• Multiple control packages, including mechanical foot controls and electric‑over‑hydraulic joystick options
  
• Improved loader arm geometry for better breakout force
  

• Auxiliary hydraulics: Additional hydraulic circuits used to power attachments such as augers, grapples, trenchers, and brooms.
  
• Mechanical auxiliary valve: A valve operated by a cable or linkage, typically controlled by a foot pedal.
  
• Electric‑over‑hydraulic control: A system where electrical switches activate solenoids that shift hydraulic valves.
  
• High‑flow hydraulics: An optional system providing increased hydraulic output for demanding attachments.
  

• A mechanical foot pedal operating a cable‑driven auxiliary valve
  
• An electric joystick toggle operating an integrated solenoid‑controlled auxiliary spool
  

• A toggle switch
  
• Two auxiliary buttons
  
• Wiring channels
  

• Replacing the mechanical auxiliary valve with an electric solenoid‑controlled valve
  
• Adding wiring harnesses
  
• Installing relays and control modules
  
• Ensuring compatibility with the machine’s existing loader valve
  
• Verifying joystick switch functionality
  

• If the machine has a mechanical foot pedal, assume the joystick toggle is inactive.
  
• Inspect the auxiliary valve to confirm whether it is mechanical or electric.
  
• Do not attempt conversion unless comfortable with hydraulic and electrical modifications.
  
• For heavy attachment use, consider upgrading to a machine with factory electric auxiliary controls.
  
• Keep the mechanical cable lubricated to maintain smooth pedal operation.
  
• Verify whether the machine has high‑flow before purchasing attachments that require it.
  

Thumb controls are auxiliary attachments commonly used on excavators, backhoes, and skid steer loaders to enhance material handling efficiency. The thumb, usually a hydraulic or mechanical clamp mounted opposite the bucket, allows operators to grasp irregularly shaped objects such as logs, rocks, or debris. This innovation in excavator hydraulics traces back to the late 20th century when operators required more precision and versatility in forestry, construction, and utility applications. Modern thumb controls integrate with standard hydraulic circuits and can be retrofitted on machines ranging from compact 1–3 ton mini excavators to large 30–40 ton units.
Terminology Explained

• Hydraulic Thumb – A thumb operated by the machine’s hydraulic system, usually controlled via an auxiliary lever.
  
• Mechanical Thumb – A manually adjustable thumb, often pinned and adjusted via linkages, requiring no hydraulic input.
  
• Bucket Cylinder – The hydraulic cylinder that moves the bucket; coordination with the thumb is critical for efficient grasping.
  
• Auxiliary Hydraulic Circuit – Additional hydraulic lines enabling accessories like thumbs or hammers to operate independently.
  
• Pin-On Attachment – Method by which the thumb mounts to the boom or dipper arm using removable pins.
  

• Lift irregular loads safely without material slipping.
  
• Increase efficiency in site cleanup, landscaping, and demolition tasks.
  
• Enhance precision in placing objects like pipes, logs, or construction debris.
  
• Reduce the need for manual labor in material handling.
  

• Operated via the machine’s auxiliary hydraulic circuit.
  
• Offers precise control and faster operation.
  
• Requires additional hoses and potential integration with joystick controls.
  
• Typically costs more upfront but reduces operator fatigue.
  

• Simpler design with fewer moving parts.
  
• Less expensive and easier to retrofit.
  
• Limited adjustment during operation; requires manual repositioning.
  
• Favored in smaller excavators or where hydraulics are fully utilized.
  

• Compatibility with existing bucket and dipper arm geometry.
  
• Hydraulic flow and pressure if using a hydraulic thumb. The auxiliary circuit must support the thumb’s cylinder without reducing bucket performance.
  
• Strength and material of the thumb. High-stress operations require reinforced steel or wear-resistant materials.
  
• Pin spacing and clearances to prevent interference with other attachments.
  

• Grease pivot points every 50–100 hours.
  
• Check for hydraulic leaks, hose wear, or cylinder seal deterioration.
  
• Inspect pins and bushings for wear or elongation; replace as needed.
  
• Coordinate thumb movement with bucket operation to avoid over-stressing pins.
  
• Store the thumb in a neutral position when the machine is idle to prevent hydraulic pressure buildup.
  

• Improper installation can cause interference with bucket swing or boom travel.
  
• Hydraulic thumbs can leak if hoses rub against the boom or if fittings are improperly tightened.
  
• Overloading the thumb with objects heavier than rated can lead to pin bending or cylinder failure.
  
• Coordination with other attachments like couplers or tilt buckets must be verified.
  

The Komatsu PC400 excavator occupies an important place in the evolution of large hydraulic excavators. Machines in this size class are commonly used in quarrying, pipeline construction, forestry road building, and remote infrastructure projects. Because many PC400 units were deployed in rugged environments, it is not unusual to encounter older machines that have been sitting unused for years. When retrieving such a machine, understanding its serial number, configuration, and service requirements becomes essential.
A machine identified by serial number 10389 falls into the early production range of the PC400 series, a period when Komatsu was expanding its heavy‑duty excavator lineup to compete more aggressively with Caterpillar’s 375 and Hitachi’s EX400. These early PC400 units were known for their mechanical simplicity, robust steelwork, and dependable hydraulic systems.
Development History of the PC400 Series
Komatsu introduced the PC400 line as part of its strategy to strengthen its presence in the large‑excavator market during the late twentieth century. The company had already established itself with the PC300 and PC200 families, which became global bestsellers. The PC400 was designed to bridge the gap between mid‑sized excavators and the ultra‑heavy mining machines like the PC600 and PC800.
Key development goals included:

• Increasing digging force for quarry and pipeline work
  
• Improving hydraulic efficiency through variable‑displacement pumps
  
• Enhancing operator comfort with upgraded cabs
  
• Strengthening undercarriage components for rocky terrain
  

• PC400 standard
  
• PC400LC long‑carriage
  
• PC400‑1, PC400‑2, PC400‑3 early generations
  
• PC400‑5 and PC400‑6 later refinements
  

• LC (Long Carriage): A wider and longer undercarriage designed for improved stability.
  
• Dash number: Indicates the generation of the machine, with higher numbers representing later updates.
  
• Serial number: A unique identifier used to determine production year, configuration, and parts compatibility.
  

• Engine oil
  
• Hydraulic oil
  
• Swing gear oil
  
• Final drive oil
  
• Coolant
  
• Fuel filters and water separators
  
• Air filters
  
• Batteries
  

• Several dozen gallons of hydraulic fluid
  
• Multiple gallons of engine oil
  
• Substantial coolant volume for the large diesel engine
  
• Gear oil for swing and final drives
  

• Hydraulic reservoir: The tank that stores hydraulic fluid for pumps and cylinders.
  
• Final drive: The planetary gear system that powers each track.
  
• Swing gear: The mechanism that allows the upper structure to rotate.
  

• Inspect all fluid levels before attempting to crank
  
• Prime the fuel system to remove air
  
• Warm the engine with external heaters if temperatures are low
  
• Check track tension and ensure the machine can move once started
  

• Standardized parts across multiple models
  
• Emphasis on durability and field serviceability
  
• Continuous refinement of hydraulic systems
  
• Strong export performance in North America, Australia, and Asia
  

• Verify the exact model variant using the serial number plate.
  
• Bring sufficient fluids and filters when preparing to start a long‑idle machine.
  
• Use high‑capacity batteries in cold climates.
  
• Inspect hydraulic hoses for cracking before applying pressure.
  
• Check for rodent damage to wiring harnesses.
  
• Prime the fuel system thoroughly to avoid dry cranking.
  
• Allow the machine to warm up slowly to protect seals and pumps.
  

The JCB 217S skid steer loader is a mid‑size compact loader valued for its balance of power, durability, and versatility on farms, construction sites, and rental fleets. JCB (J. C. Bamford Excavators Limited), founded in England in 1945, grew into one of the world’s largest manufacturers of construction and agricultural equipment, with annual machinery sales exceeding tens of thousands of units globally. The 217S model, part of JCB’s extensive skid steer lineup, typically features a rated operating capacity of about 1,700–1,850 lbs (771–839 kg) and a net engine power in the range of 50–60 hp (37–45 kW) depending on configuration and market. Its robust design and dependable hydraulics made it popular in the 2000s and 2010s in North America and Europe.
At some point in a machine’s life, major components such as the transmission may need servicing or replacement due to wear, internal damage, or contamination. Removing a skid steer transmission is a complex task that requires good understanding of the drivetrain, proper tools, safety precautions, and a methodical approach. This article consolidates detailed guidance for removing the transmission on a JCB 217S, introduces key terminology, discusses practical challenges, suggests solutions, and shares field lessons from technicians and enthusiasts.
Terminology Explained

• Transmission – The drivetrain component responsible for transmitting engine power to the wheels or tracks, often involving gears, clutches, and hydraulic torque converters in skid steer loaders.
  
• Torque Converter – A fluid coupling between the engine and transmission that provides torque multiplication and allows the engine to remain idling while the machine is stopped.
  
• Hydrostatic Drive – A common type of drive system in skid steers, where hydraulic motors powered by the engine drive the wheels or tracks through fluid power rather than direct mechanical gears.
  
• Final Drive – The gear reduction assemblies at the wheels or tracks that further increase torque before it reaches the ground.
  
• Bellhousing – The housing that encloses the drive components between the engine and transmission, connecting to the torque converter or input shaft.
  

• Work is performed on a flat, level surface with adequate space to move a heavy assembly.
  
• The machine is securely supported with jack stands or an equivalent means; never rely solely on jacks.
  
• Battery power is disconnected to prevent accidental starter engagement or electrical shorts.
  
• Fuel and hydraulic systems are cooled and depressurized following manufacturer service recommendations.
  

• Label and disconnect all hydraulic hoses and fittings that serve the transmission and associated control valves.
  
• Cap or plug lines immediately to prevent contamination of the hydraulic system; even small amounts of dirt can cause pump or motor wear.
  
• Remove lines to the final drive motors if these are integrated into the wheel hubs.
  

• Disconnect speed sensors, pressure switches, and related electrical harnesses.
  
• Label connectors to simplify reassembly.
  
• Inspect wiring for wear or corrosion and repair as needed prior to reinstallation.
  

• Support the transmission with a jack or lifting device.
  
• Remove all bellhousing bolts connecting the transmission to the engine block.
  
• If the machine uses a torque converter, ensure it is supported and carefully unbolted from the flexplate or flywheel.
  

• Slowly lower the transmission assembly, watching for any snagged hoses or wires.
  
• Clear the area around the loader frame to slide the transmission back and down.
  
• Use caution: the torque converter may exit with the transmission if not secured, and its weight adds complexity.
  

• Check the bellhousing surface and engine alignment dowels for wear or damage.
  
• Inspect the torque converter for signs of slipping, overheating (discoloration), or internal damage.
  
• Assess hydraulic lines, connectors, and sensor harnesses for wear and contamination.
  

• Always install clean caps or plugs immediately upon hose removal.
  
• Keep hydraulic openings oriented downward or covered with lint‑free cloth.
  
• After reassembly, purge air from hydraulic circuits following OEM procedures to prevent pump cavitation or erratic transmission behavior.
  

• Inspecting and replacing worn alignment dowels.
  
• Checking the flexplate surface for scoring or damage and machining it flat if needed.
  
• Ensuring that the torque converter is correctly seated on the input shaft before mating to the engine.
  

• Use a transmission jack with adjustable support, preventing tilting or dropping.
  
• If a shop crane is used, ensure load capacity exceeds the transmission weight by a safe margin (a 1.5–2× safety factor is advisable).
  
• Employ at least two technicians to guide the assembly, designating one to control the lift device and one to guide alignment.
  

• Test for smooth travel in all directions and consistent drive speed.
  
• Listen for grinding or slipping under load; early signs of internal wear may manifest in drive response.
  
• Check for hydraulic oil cleanliness and correct levels; contaminated fluid is a common source of hydrostatic drive issues.
  

Regional Pricing Trends
Concrete pricing in South Texas has always been influenced by a combination of climate, labor availability, and the rapid pace of construction in the region. While many property owners use a rough estimate of six dollars per square foot for budgeting, real-world quotes often vary widely. In some cases, contractors have proposed prices nearly double that figure for medium‑sized slabs, especially when the project includes thicker pours, heavy reinforcement, or tight scheduling.
A typical example is a 40‑by‑75‑foot slab with a thickness of six inches. Using a baseline of six dollars per square foot would suggest a cost in the range of eighteen thousand dollars. However, some contractors in high‑demand areas have quoted prices exceeding forty thousand dollars for the same work. These discrepancies highlight the importance of understanding what drives cost and how to evaluate a contractor’s proposal.
Concrete Material Costs
Concrete itself is usually priced by the cubic yard. A six‑inch slab requires half a foot of depth, meaning each square foot consumes 0.5 cubic feet of concrete. One cubic yard equals twenty‑seven cubic feet, so a six‑inch slab uses roughly 0.0185 cubic yards per square foot. At one hundred dollars per cubic yard—a common figure for basic mixes in warm climates—the raw material cost for concrete alone is a small portion of the total project.
Terminology notes:

• Cubic yard: A standard volume measurement in concrete supply, equal to twenty‑seven cubic feet.
  
• Admixture: Chemical additives used to modify concrete behavior, such as slowing curing time in hot weather.
  
• Air entrainment: A process that introduces microscopic air bubbles to improve durability.
  

• Formwork installation
  
• Rebar placement or mesh installation
  
• Concrete placement and leveling
  
• Bull floating and power trowel finishing
  
• Edge reinforcement and ramp construction
  

• Expected point loads
  
• Soil compaction quality
  
• Presence of heavy vehicles or agricultural equipment
  
• Need for crane rails or embedded anchors
  

• Use six dollars per square foot as a baseline, but expect variation.
  
• Request multiple quotes and compare labor breakdowns.
  
• Ask contractors whether fiber reinforcement can replace rebar for your application.
  
• Ensure soil is properly compacted before pouring.
  
• Consider seasonal timing to reduce labor costs.
  
• Evaluate whether a pole barn or steel building better fits your long‑term plans.
  
• Plan for future equipment needs, including cranes, ramps, and heavy machinery.
  

The John Deere 310L is part of Deere & Company’s long‑running line of backhoe loaders, representing a modern evolution in Deere’s mid‑range excavating and loading equipment. John Deere, founded in 1837 and historically known for agricultural gear, expanded into construction machinery in the late 20th century and became a serious competitor to Caterpillar, Case and JCB. The 310L model — often seen used on construction sites and rental fleets — blends loader and backhoe functions, giving operators versatility for digging, trenching, material handling and site prep. Typical operating weight is about 14,500–16,000 lbs (6,600–7,300 kg) with gross engine power in the 74–93 hp (55–70 kW) range. Its popularity has resulted in abundant used units on the market, but prospective buyers must understand what to look for and what pitfalls to avoid.
Machine Purpose and Typical Applications
Backhoe loaders like the Deere 310L are valued for job sites that require:

• Utility trenching
  
• Loading and material handling
  
• Site cleanup
  
• Small demolition tasks
  
• Roadside work and landscaping
  

• Operating Weight – Total weight with standard equipment, fuel, and fluids, which affects stability and transport logistics.
  
• Gross Engine Power – The engine output before accessories and drivetrain losses; influences bucket breakout and travel performance.
  
• Loader Breakout Force – The maximum force the front loader can apply to lift or break loose heavy material.
  
• Backhoe Dig Depth – Maximum vertical reach for trenching, often listed in the machine’s spec sheet.
  
• Transmission – Many 310L units use powershift or gear‑type transmissions, providing forward and reverse gear ranges for travel speed control.
  

• Versatile performance — ability to switch between loader and backhoe tasks without changing machines.
  
• Operator Comfort — newer cab features and ergonomic layouts compared with earlier generations.
  
• Serviceability — Deere’s parts availability and dealer support for common service items such as filters, brakes and hydraulics.
  
• Proven Reliability — many 310Ls have logged 4,000–8,000+ hours while still performing acceptably in general service.
  

• Check for smoke at startup and under load — excessive white or black smoke can indicate fuel or combustion issues.
  
• Run‑up to operating RPM and check for smooth throttle response.
  
• Inspect transmission engagement and gear changes for slipping or jerkiness.
  

• Observe loader and backhoe speed under load — sluggish movement can suggest internal pump wear or low hydraulic pressure.
  
• Check for hydraulic leaks at hoses, cylinders, and quick‑connect couplers.
  
• Test auxiliary circuits if used with attachments like hammers or augers.
  

• Inspect tire wear, cuts, or sidewall damage — good tires improve stability and reduce future maintenance cost.
  
• Examine loader linkage pins and bushings for excessive play.
  

• Verify all gauges and controls respond correctly.
  
• Check seat comfort and condition, as older cabs may have worn cushioning or controls sticking due to wear.
  

• Hours vs. Wear Balance — Machines with higher hours aren’t necessarily bad if they’ve been maintained properly; low hours with signs of abuse are worse.
  
• Hydraulic Oil Analysis — Lab testing can reveal wear metals or contamination even when the machine appears to function.
  
• Transmission Service Records — Regular oil and filter changes help longevity; absence of such records raises a red flag.
  
• Attachment Compatibility — Confirm loader and backhoe attachments match job needs and verify auxiliary circuit flow and pressure.
  

• Check engine start‑up behavior with cold and warm engine.
  
• Observe backhoe dig cycle under varying loads.
  
• Test steering and travel under load.
  
• Inspect all pivot points for play and play‑induced wear.
  
• Review service records and receipts if available.
  

• Budgeting for immediate consumables — filters, fluids, seals and minor hoses often need replacement even on good used machines.
  
• Arranging pre‑purchase inspections by a trusted technician who can test pressures and operational performance.
  
• Comparing multiple units — availability of older models can let a buyer test similar machines under similar conditions to understand typical wear patterns.
  

• Machines that have sat idle for long periods may have stiff hydraulics or seals that have dried.
  
• Units with evident weld repairs on the loader or boom suggest previous structural issues that deserve closer scrutiny.
  
• Transmission or torque converter symptoms like shuddering under load can signal impending major service needs.
  

The Ford 5100‑series machines occupy an interesting place in Ford’s industrial equipment lineage. Although the 5100 was originally designed as a general‑purpose agricultural tractor, many units were later paired with loaders and backhoes, effectively transforming them into versatile construction machines. This hybrid identity explains why owners often encounter questions about components such as swing chains, cylinders, and axles—parts that were engineered for industrial duty but installed on platforms that began life in farming.
The swing chain system, in particular, is a defining feature of older Ford backhoes. It is simple, durable, and surprisingly effective, but it requires periodic inspection and occasional replacement. The following article expands on the mechanical logic behind the swing system, the historical context of the Ford 5100/5500 family, and practical guidance for replacing a damaged swing chain.
Development Background of the Ford 5100 and 5500
Ford’s industrial tractor line evolved rapidly during the 1960s and 1970s. The 5100 was marketed primarily as an agricultural tractor, while the 5400 and 5500 were engineered as utility and industrial variants. The 5500, in particular, became a popular base for loader‑backhoe configurations due to its straight heavy‑duty front axle, reinforced frame, and compatibility with Ford’s industrial hydraulic systems.
Key distinctions among the series included:

• The 5100 used a high‑arch adjustable agricultural axle.
  
• The 5400 used a heavier non‑adjustable axle suited for utility work.
  
• The 5500 used a straight industrial axle designed for loader and backhoe stress.
  

• Single‑acting cylinder: A hydraulic cylinder that applies force in only one direction.
  
• Multi‑leaf chain: A layered chain design used in heavy machinery for high tensile strength.
  
• Swing tower: The vertical structure that supports the backhoe boom and allows rotation.
  

• Chain leaf stretching or cracking
  
• Wear at the end fittings
  
• Cylinder rod scoring from misalignment
  
• Excessive play in the swing arc
  
• Broken chain segments due to sudden impact loads
  

• Shut down the machine completely.
  
• Tie or secure the swing control lever in the direction opposite the broken chain.
  
• Allow the functioning cylinder to retract, which pulls the damaged cylinder outward.
  
• With moderate manual force, the cylinder rod can usually be extended far enough to access and replace the chain.
  

• Purchasing industrial multi‑leaf chain stock
  
• Reusing existing end fittings
  
• Fabricating new end plates when necessary
  

• Front axle pivot pins
  
• Kingpin bearings
  
• Bushings in the loader frame
  
• Steering linkage joints
  

• Inspect swing chains every 250–300 operating hours.
  
• Replace both chains if one shows significant wear to maintain balanced swing force.
  
• Avoid slamming the boom at full swing extension to reduce shock loads.
  
• Keep the swing tower greased to minimize side‑loading on the chains.
  
• Consider upgrading to higher‑grade industrial chain stock for long‑term durability.
  

The EX‑60G is a compact hydraulic excavator widely recognized in construction, landscaping, utility work, and property maintenance. Produced by Hitachi Construction Machinery, a company with roots going back to the early 20th century and a major global presence in excavators, cranes, and related heavy equipment, the EX‑60G represents a generation of 6‑ton class machines designed to balance power, maneuverability, and transportability. Hitachi excavators have been common in Europe, North America, and Asia, with legacy and used machines still in service decades after manufacture.
The EX‑60G sits comfortably between smaller entry‑level mini excavators and larger 8–10‑ton models. Typical operating weight for this class is around 13,500–14,000 lbs (6,100–6,400 kg), and engine power usually ranges from 55–65 hp (41–48 kW) depending on market emissions and configuration. The model has a standard digging depth around 12–13 ft (3.6–3.9 m) and bucket breakout forces that make it capable of medium‑duty trenching and grading. While generally reliable, these machines are subject to wear and typical issues that occur over extensive service life. Understanding common behaviors and maintenance needs helps operators keep the EX‑60G productive over thousands of hours.
Terminology Explained

• Operating Weight – Total machine weight ready to work, including full fuel tank, operator cab and standard attachments.
  
• Hydraulic Flow – Volume of hydraulic fluid pumped per minute, measured in gallons per minute (gpm) or liters per minute (L/min); higher flow typically yields faster implement action.
  
• Bucket Breakout Force – Measure of how much force the bucket can apply when ripping or lifting material, especially important for hard soils or loading.
  
• Swing Mechanism – The system allowing the upper structure to rotate, enabling digging and filling without repositioning the tracks.
  
• Track Tension – Manufacturer‑specified tightness of the track chain; incorrect tension accelerates wear and reduces traction.
  

• Utility trenching for water, gas, or electrical lines;
  
• Landscaping and irrigation ditching in tight spaces;
  
• Site cleanup and material handling with appropriate thumb or grapple attachments;
  
• Light demolition in urban environments.
  

• Smooth hydraulic action – Even under varying load, pilot‑controlled hydraulics offer predictable response.
  
• Reliable engine torque – With engines optimized for low‑end torque, digging into loamy or mixed soils feels controlled.
  
• Compact travel footprint – The relatively short tail swing and narrow tracks make maneuvering around obstacles easier than with larger excavators.
  
• Serviceability – Access to routine service points such as filters, coolers, and fluid fill ports tends to be user‑friendly.
  

• Slowed bucket or boom speed under load
  
• Spongy or inconsistent joystick response
  
• Heat buildup in hydraulic oil during extended use
  

• Checking track tension every 50–100 service hours
  
• Inspecting roller and idler wear patterns
  
• Replacing grouser pads if chipped or worn
  

• Control rod end play
  
• Pin and bushing wear
  
• Hydraulic pilot circuit pressures
  

• Adhere to scheduled service intervals for hydraulic fluid, engine oil, and filters.
  
• Monitor hydraulic temperature; extended high‑temperature operation shortens fluid life.
  
• Check track tension and wear regularly, especially in abrasive environments.
  
• Inspect attachment hoses and couplers for leaks or swelling.
  
• Use quality fuel and clean air filtration to protect engine internals.
  

The 1997 CASE 580 Super L Series 2 is part of one of the most enduring and widely used lines of backhoe loaders in North America and beyond. Backhoe loaders — a hybrid between a loader and an excavator — are workhorses on construction sites, farms, utilities, and municipal projects. Case Construction Equipment traces its roots to the 19th century, evolving from simple steam engines to modern diesel‑powered machines. By the 1990s, the 580 series had become a benchmark for reliability, ease of use, and serviceability. The “Super L” designation indicates a particular generation within the 580 line that offered improved hydraulic performance and operator comfort compared to earlier models. In the late 1990s, Case was delivering tens of thousands of these machines worldwide, supporting productive fleets in diverse applications.
The Series 2 version of the 580 Super L incorporated refinements over the basic Super L, including updates to hydraulic circuitry, linkage geometry, and cab ergonomics. This article unpacks the machine’s characteristics, common performance behaviors, terminology, maintenance challenges, and real‑world operational anecdotes — all designed to provide a complete, practical view of what owning and operating a 580 Super L Series 2 entails.
Machine Basics and Specifications
As a dual‑function machine, the Case 580 Super L Series 2 combines a front loader bucket with a rear backhoe. Typical specifications for a 1997 unit include:

• Operating Weight: approximately 15,000–17,000 lbs (6,800–7,700 kg) depending on configuration and attachments
  
• Engine Power: roughly 74–90 hp (55–67 kW), depending on spec and emissions settings
  
• Loader Bucket Capacity: around 1.0 yd³ (0.76 m³)
  
• Backhoe Reach: around 15–16 ft (4.5–4.9 m) depending on dipper and boom setup
  
• Hydraulic Flow: typically around 23–26 gpm (87–98 L/min) delivering good cycle times for bucket and dipper functions
  

• Operating Weight: Total weight of the machine ready to work, including cab, full fuel, and standard equipment.
  
• Hydraulic Flow: The volume of hydraulic fluid delivered per minute; higher flow often translates to faster implement action.
  
• Backhoe Swing: The lateral motion of the backhoe boom and dipper, enabling efficient trenching without repositioning the whole machine.
  
• Loader Breakout Force: A measure of how much force the loader bucket can apply during lifting and dumping cycles.
  
• Stabilizers: Extendable legs at the rear that support the machine during digging to improve leverage and reduce bounce.
  

• Hydraulic Responsiveness: Early models sometimes exhibited a slight lag in implement response during heavy digging or lift cycles — a function of hydraulic pump design and spool valve response times.
  
• Engine Torque Characteristics: Diesel engines in this era delivered torque in a broad mid‑range, useful for digging but sometimes feeling sluggish under full load with loader buckets.
  
• Travel Stability: The backhoe loader’s front wheels were narrower than the rear, leading to a slightly “tippy” feel when carrying heavy loads at full reach without stabilizers deployed.
  

• Hydraulic System Health: Old hydraulic oil can oxidize and become contaminated, impairing flow and component life. Regular fluid and filter changes reduce wear and improve responsiveness.
  
• Seals and Hoses: Rubber components age; cracking and swelling can cause leaks and pressure loss. Replacing hoses on a schedule helps avoid sudden failures.
  
• Engine Tune‑Up: Routine checks on injectors, filters, and valve lash ensure strong torque delivery under load — key for digging and loader operations.
  
• Undercarriage and Tires: While not a tracked machine, proper tire inflation and inspection for sidewall damage directly impact stability and traction.
  

• Keep hydraulic oil clean and at proper temperature — contamination and overheating both reduce system efficiency.
  
• Use quality fuel and engine filters — older diesels are sensitive to injector wear caused by poor filtration.
  
• Monitor loader and backhoe linkage pins for wear; excessive play reduces accuracy and increases operator fatigue.
  
• Adjust stabilizers before heavy digging to improve leverage and reduce swing cycle stress.