Overview of Scrap Hauling
Scrap hauling is a vital part of the recycling and waste management industry, involving the transport of scrap metal and other recyclable materials from collection points to processing facilities. Companies like S & S Trucking specialize in this niche, providing services that keep materials moving efficiently and support sustainable practices.
Operations and Equipment Used

• Trucking Fleet: Scrap haulers typically operate a range of trucks including flatbeds, dump trucks, and specialized roll-off trucks designed for carrying scrap efficiently.
  
• Load Handling Equipment: Some trucks are equipped with cranes or grapples to load and unload scrap materials directly, improving turnaround times.
  
• Safety and Compliance: Given the heavy and often sharp materials involved, trucks must comply with safety regulations including secure load fastening and proper weight distribution.
  

• Weight and Load Management: Scrap materials can be dense and irregularly shaped, requiring careful weight balancing to avoid overloading and ensure road safety.
  
• Route Planning: Efficient routes must be planned to optimize fuel consumption and delivery times, especially when handling multiple pick-up locations.
  
• Environmental Considerations: Haulers need to manage dust, debris, and potential spills to minimize environmental impact during transport.
  

• Experience in handling heavy and sometimes hazardous materials safely.
  
• Knowledge of vehicle maintenance to prevent breakdowns due to the tough conditions of scrap hauling.
  
• Ability to operate loading equipment such as cranes or hydraulic grapples when available.
  

• Roll-off Truck: A truck designed to carry large, open-top containers that can be rolled on and off the vehicle for easy loading and unloading.
  
• Grapple: A hydraulic claw attachment used for grabbing and lifting scrap materials.
  
• Load Securing: Techniques and equipment used to keep materials stable during transport.
  
• Weight Distribution: Proper balancing of cargo weight across the vehicle’s axles for safety and legal compliance.
  

• Support for Recycling Industry: Efficient hauling enables quicker recycling turnaround, reducing landfill use and promoting resource conservation.
  
• Economic Impact: Scrap hauling creates jobs and supports industries dependent on recycled metals.
  
• Environmental Protection: Proper transport methods reduce pollution and risks associated with scrap material spills or accidents.
  

Introduction to Trailering Challenges
Transporting heavy, large-scale machinery—affectionately dubbed “trailering a whale” due to the sheer size and weight—presents unique logistical and safety challenges. Whether it’s a massive excavator, bulldozer, or specialized equipment, understanding the nuances of moving oversized loads is critical for operators, haulers, and project managers.

Key Considerations in Trailering Large Equipment
• Weight and Dimension Compliance — Knowing exact machine weight and dimensions is fundamental. Oversized loads may exceed standard highway limits, requiring permits and specialized routes.
• Trailer Selection and Capacity — Choosing the correct trailer type (lowboy, step-deck, multi-axle) depends on machine weight distribution, ground clearance, and stability needs.
• Loading and Unloading Techniques — Proper ramp angle, ground conditions, and securing procedures prevent damage or accidents during these critical moments.
• Permitting and Escort Requirements — Oversized or overweight loads often mandate state or provincial permits, pilot cars, and police escorts for safe transport.

Technical Terms Explained
• Lowboy Trailer — A flatbed trailer with a drop deck, allowing taller loads while maintaining legal height limits.
• Axle Configuration — The arrangement and number of axles impact load capacity and road damage liability.
• Load Securement — Use of chains, binders, and tensioners to immobilize the equipment on the trailer.
• Route Survey — Pre-transport assessment of road widths, bridge capacities, and overhead clearances.

Practical Insights and Real-World Stories
A contractor recalling their first “whale” haul described initially underestimating the complexity of trailering a large bulldozer. They faced challenges with bridge clearances and required rerouting. Investing time in a thorough route survey and obtaining all necessary permits upfront saved costly delays.
In another case, operators shared how they avoided equipment damage by adjusting the trailer loading angle to minimize stress on the machine’s undercarriage during ramp transitions, highlighting the importance of trailer and site compatibility.

Safety Tips for Trailering Oversized Machinery

• Inspect all trailer components—tires, brakes, and suspension—before loading.
  
• Use certified load binders and chains rated for the equipment’s weight.
  
• Conduct test drives on short routes to evaluate handling.
  
• Communicate constantly between driver, escort vehicles, and ground crew.
  
• Plan for emergency contingencies such as breakdowns or detours.
  

Introduction to Pettibone Equipment
Pettibone is a historic name in the field of heavy machinery, specializing in material handling equipment such as cranes, loaders, and railroad maintenance machines. Over many decades, Pettibone machines have been favored for their durability, innovative design, and adaptability in industries like construction, railroads, and forestry.
Role of Pettibone Service Technicians and Mechanics

• Pettibone service technicians and mechanics have been essential in maintaining the longevity and operational reliability of these specialized machines.
  
• Their expertise spans diagnostics, repairs, routine maintenance, and troubleshooting of both mechanical and hydraulic systems.
  
• Given the rugged environments Pettibone equipment operates in, service personnel often developed unique problem-solving skills and practical tricks passed down through hands-on experience.
  

• Hydraulic Systems: Maintenance and repair of pumps, cylinders, valves, and hoses. Pettibone machines rely heavily on hydraulics for lifting and positioning functions.
  
• Mechanical Components: Including engines, transmissions, axles, and steering mechanisms. Knowledge of Pettibone’s custom parts and configurations was crucial.
  
• Electrical Systems: Troubleshooting wiring, sensors, and control panels, especially as machines evolved with electronic controls.
  
• Fabrication and Welding: Many service techs performed on-the-spot fabrications or structural repairs due to the remote or demanding work sites.
  

• Limited availability of OEM parts for older machines often required mechanics to retrofit or fabricate parts to keep equipment operational.
  
• Remote job sites meant that technicians had to be self-reliant and resourceful, sometimes working under adverse conditions and tight deadlines.
  
• Evolving technology in Pettibone machines required continuous learning and adaptation.
  

• Many Pettibone techs shared stories of maintaining machines in harsh weather or challenging terrain, where their skill and quick thinking prevented costly downtime.
  
• The Pettibone technician community often exchanged advice, manuals, and personal tips through informal networks, contributing to a rich knowledge base.
  
• Some technicians fondly recall repairing early Pettibone machines by hand with minimal tools, creating a deep bond with the equipment and the company culture.
  

• OEM (Original Equipment Manufacturer): The company that manufactures parts or equipment, here referring to Pettibone.
  
• Hydraulic Cylinder: A component that uses pressurized fluid to create mechanical force and motion.
  
• Fabrication: The process of constructing or repairing metal parts by cutting, welding, and assembling.
  
• Troubleshooting: Systematic approach to diagnose and fix mechanical or electrical issues.
  

• Pettibone service technicians played a vital role in the company’s reputation for reliability and ruggedness.
  
• Their hands-on expertise influenced training programs and service procedures adopted by Pettibone and similar equipment manufacturers.
  
• The culture of ingenuity among Pettibone mechanics has become part of heavy equipment lore, inspiring future generations of technicians.
  

               

Overview: Strength Meets Precision
The Komatsu D155AX-6 stands out as a heavy-duty crawler dozer designed for ambitious earthmoving tasks. Here’s what makes it a standout machine:
• Engine: The Komatsu SAA6D140E-5 diesel engine delivers a robust 354 hp (264 kW) at 1,900 rpm—a Tier 3 compliant, turbocharged, after-cooled powerhouse.
• Productivity: With a Sigmadozer blade offering approximately 12.3 cubic yards of capacity, it leads in effective material movement.
• Weight & Size: Weighing in at roughly 87,100 lb (39.5 t), the machine maintains a balance between bulk and maneuverability.
• Transmission: The automatic TORQFLOW transmission features a lock-up torque converter—enhancing fuel efficiency and seamless power delivery.
• Smart Control: Equipped with Komtrax wireless monitoring, joystick controls, and an expanded cab display, the machine blends comfort with intelligent diagnostics.
Technical Insights: Powertrain and Control Systems
• Sigmadozer Blade: Engineered with a new digging theory, the Sigmadozer maximizes penetration, minimizing side sway to ensure stable cutting performance.
• TORQFLOW Transmission: Water-cooled, single-stage torque converter with planetary gears delivers strong traction and responsive shifting, optimizing heat management.
• Komtrax System: Remote monitoring enhances uptime by enabling real-time diagnostics, theft prevention, and proactive maintenance.
• Operator Comfort: Joystick control ergonomics and cab visibility reduce fatigue; automatic shifting offers efficient adaptability.
Maintenance & Reliability
Maintenance procedures follow rigorous scheduling and safety measures:
• Detailed maintenance schedules covering filters, belts, hydraulics, radiator, and more must be adhered to—supported by tool-aligned safety practices.
• Shop manuals define safe procedures across engine, powertrain, electrical and hydraulic systems, including torque specifications and lubrication points.
• Worker safety is prioritized, with specific guidelines for tasks like pressure relief, lifting, disassembly, and valve adjustments.
Stories from the Field
A recent sale of a 2007 D155AX-6 to an Irish contractor illustrates the machine’s reputation: prized for its durability, productivity, and maneuverability, it became a reliable asset out in the field.
In comparative studies, the D155AX-6 outperformed competitors like the Cat D8 in blade capacity—12.3 yd³ versus 11.4 yd³—highlighting its material-moving superiority.
Specifications at a Glance (as a concise list)
• Engine power: 354 hp (264 kW), Tier 3 Komatsu SAA6D140E‑5
• Operating weight: ~87,100 lb (39.5 t)
• Blade capacity: ~12.3 yd³ (Sigmadozer)
• Transmission: Automatic TORQFLOW with lock-up torque converter
• Driver interface: Joystick controls, smart LCD, Komtrax monitoring
Why the D155AX‑6 Matters
This machine blends heavy-duty performance with efficiency and sophistication. The Sigmadozer’s engineering, advanced transmission, operator-centric design, and remote diagnostics make it a formidable choice for demanding tasks. Whether ripping ground or clearing terrain, its smart control systems and rugged durability consistently deliver.
Have questions about hydraulic systems, blade configurations, or maintenance best practices for the D155AX‑6? Let’s dig deeper together!

Introduction to the Case 580 Super N Thumb
The Case 580 Super N backhoe loader is a versatile and widely used machine in construction and agriculture. One popular enhancement is the installation of a thumb attachment, which significantly improves the machine’s ability to grasp, hold, and manipulate materials beyond what the standard bucket can achieve.
Purpose and Benefits of a Thumb Attachment

• Improved Material Handling: Enables the operator to pick up irregular or bulky objects such as logs, rocks, and debris with greater precision.
  
• Increased Job Efficiency: Reduces the need for manual labor or secondary equipment by allowing secure gripping.
  
• Enhanced Versatility: Converts the backhoe from a simple digging machine into a multifunctional tool for demolition, landscaping, and material sorting.
  
• Safety Improvements: Secure grip minimizes material slipping or dropping during transport, reducing site hazards.
  

• Mechanical Thumb: Operated manually via linkage and pins, durable and cost-effective.
  
• Hydraulic Thumb: Controlled by hydraulic cylinders, offering greater flexibility and easier operation.
  

• Proper alignment with the bucket and backhoe arm is critical to ensure smooth operation.
  
• Hydraulic thumbs require additional plumbing and control valves integrated into the machine’s system.
  
• Mechanical thumbs need robust mounting brackets and linkage pins that match the machine’s specifications.
  

• Use the thumb in tandem with the bucket to “pinch” materials firmly.
  
• Adjust thumb positioning carefully to avoid interference during digging or trenching.
  
• Regularly inspect pins, bolts, and hydraulic hoses for wear or damage.
  

• Lubricate pivot points to prevent binding and wear.
  
• Monitor hydraulic cylinder seals to avoid leaks in hydraulic thumbs.
  
• Check for structural cracks or bends, especially after heavy-duty use.
  

• Thumb Attachment: A claw-like device mounted opposite the bucket to grip materials.
  
• Hydraulic Cylinder: A component that uses fluid pressure to create linear motion.
  
• Mechanical Linkage: Rods or bars transmitting mechanical force to move the thumb.
  
• Pivot Point: The axis around which the thumb moves.
  
• Mounting Bracket: Structural support attaching the thumb to the backhoe arm.
  

• Increased operational capability on various materials.
  
• Enhanced precision in material manipulation.
  
• Greater machine flexibility, reducing need for additional equipment.
  
• Improved operator safety and efficiency.
  

Overview of Swing Motor Applications
The John Deere 70D and the Hitachi EX60 excavators share a remarkably similar swing motor assembly, as evidenced by shared component part numbers and interchangeable gearbox units. Notably:
• The swing motor for the John Deere 70D is listed under part number 4224977, and it fits both the 70D and Hitachi EX60 models.
• The swing gearbox (gear box without motor) uses part numbers 9097683 or AT128448, which are applicable to both the Hitachi EX60/EX60G and the John Deere 70D.
• Market supply listings such as those from FridayParts and other aftermarket vendors reaffirm this interchangeability across both brands.

Understanding Key Terminology
• Swing Motor – The hydraulic motor that powers the excavator’s house rotation mechanism around the slewing ring.
• Swing Gearbox – The planetary gearbox (often without the motor) that transmits torque from the swing motor through the slewing ring. Gearbox alone covers the gearing mechanism.
• Part Number Cross-Reference – Identifiers like 4224977 (motor) or AT128448 (gearbox) indicate that manufacturers or suppliers recognize identical components between models.

Real-World Context and Maintenance Notes
Users and parts suppliers have long recognized the parts interchangeability:

Quote:A parts search revealed listings such as TH111894 (with updates to 4224977) for the swing motor, showing availability across multiple platforms.

• Swing Motor (Part #4224977):
  Compatible with:
  • John Deere 70D
    
  • Hitachi EX60
    
• Swing Gearbox (Part #9097683 / AT128448):
  Compatible with:
  • Hitachi EX60 / EX60G
    
  • John Deere 70D
    

• Reduced Inventory Needs: Spare parts can be shared across both models—simplifying procurement and stock management.
  
• Faster Repairs: Common parts mean quicker sourcing and turnaround times, especially in remote job sites where parts availability is critical.
  
• Cost Efficiency: Greater aftermarket availability and competition can lower replacement costs without compromising reliability.
  

Introduction to LaPlant Choate Scrapers
LaPlant Choate scrapers are a notable type of earthmoving equipment designed primarily for large-scale soil excavation, transportation, and grading projects. These machines combine the functions of a loader and a hauling unit in a single self-propelled scraper, enabling efficient cut-and-fill operations on construction and mining sites.
Historical Background

• LaPlant Manufacturing was active during the mid-20th century and contributed specialized scrapers that stood out for their ruggedness and innovative designs.
  
• The Choate brand became synonymous with durable, effective scrapers widely used in highway construction and large earthmoving projects.
  
• Over the decades, LaPlant Choate scrapers have earned a reputation for reliability in tough working environments.
  

• Bowl or Hopper: The main soil-carrying compartment, designed to hold several cubic yards of material.
  
• Cutting Edge and Apron: The cutting edge scrapes soil from the ground, while the apron controls loading and unloading by opening or closing.
  
• Push Block or Push Frame: Enables the scraper to be pushed or pulled by a tractor or integrated power unit.
  
• Engine and Transmission: Some models are self-propelled with dedicated engines; others are tractor-drawn.
  
• Hydraulic Systems: Control the raising, lowering, and dumping of the bowl for precise material placement.
  
• Tandem Axles and Wheels: Designed for load-bearing and stability during transport and work.
  

• LaPlant Choate scrapers excel in moving large volumes of soil efficiently between cut (excavation) and fill (deposit) areas.
  
• Operators use the scraper to cut into the soil, load the bowl, transport material, then spread it evenly at the fill site.
  
• These machines reduce the need for separate loaders and haul trucks, streamlining earthmoving operations.
  

• Regular inspection of the cutting edge and apron is essential to prevent premature wear.
  
• Hydraulic lines and cylinders require routine checks for leaks and functionality.
  
• Bearings and tires on the tandem axles need monitoring due to heavy loads and rough terrain.
  
• Engine and transmission maintenance are critical, especially for self-propelled models.
  

• Bowl: The container section of the scraper that holds excavated material.
  
• Apron: The front plate of the bowl that opens to dump soil.
  
• Cutting Edge: The bottom blade that scrapes soil into the bowl.
  
• Push Block: The rear frame used to push the scraper when tractor-drawn.
  
• Self-Propelled Scraper: A scraper with its own engine and drivetrain.
  
• Hydraulic Cylinder: A mechanical actuator that uses hydraulic fluid to control movement.
  

Hydraulic System Specifications and Understanding Flow vs. Pressure
The Bobcat X325 (akin to the 325 mini‑excavator) features a hydraulic pump flow capacity approximately 17.5 gal/min (around 66 L/min) . While pressure testing revealed the pump delivers up to 2,300 psi, consistent with manual specifications, the overall performance often hinges more on flow (speed of power application) than pressure (maximum force) .
Terminology Clarified

• Pressure (psi) – The force per unit area exerted by the hydraulic fluid; maximum pressure reflects potential lifting force.
  
• Flow rate (gpm or L/min) – Volume of fluid moved per minute; higher flow means faster acting components.
  
• Pressure relief valve – A safety component that opens when system pressure reaches a set threshold, preventing damage.
  
• Gear pump – The type of hydraulic pump used for generating fluid flow and pressure.
  

• Monitor actuation times for key functions (e.g., boom lift, track movement); compare to expected performance.
  
• Use a pressure gauge to confirm pump pressure hits nominal levels (e.g., ~2,300 psi).
  
• Observe how the system behaves when working under different configurations—for instance, using blade and boom in sequence or together.
  
• Look for delayed response or sluggishness that may indicate filter restrictions, fluid degradation, or internal pump wear.
  

Introduction: The Accumulator’s Function in Hydraulic Systems
In hydraulic machinery like the CAT 305CR mini excavator, the accumulator plays a vital role in stabilizing system pressure, absorbing shocks, and ensuring smooth operation. It acts as a pressure reservoir that compensates for pressure fluctuations and helps maintain consistent hydraulic performance.
What Happens When the Accumulator is Missing?

• Pressure Instability: Without an accumulator, the hydraulic system can experience sudden pressure spikes or drops, leading to erratic machine behavior.
  
• Increased Wear and Tear: Pressure shocks transmit directly to pumps, valves, and cylinders, accelerating component fatigue and failure.
  
• Reduced Operational Smoothness: Operators may notice jerky or uneven movements during boom, arm, or bucket operation.
  
• Potential Safety Risks: Sudden hydraulic system responses can lead to unexpected machine actions, posing hazards on the worksite.
  

• Jerky hydraulic movements or hesitation in controls.
  
• Audible knocking or banging noises from the hydraulic system.
  
• Frequent hydraulic system warnings or error codes.
  
• Premature failure of hydraulic pumps or seals.
  

• Verify accumulator presence and condition during routine hydraulic system inspections.
  
• Use OEM (Original Equipment Manufacturer) specified accumulators for correct sizing and pressure ratings.
  
• Follow proper charging procedures with nitrogen gas to ensure accumulator performance.
  
• Inspect for leaks, damage, or loss of gas charge regularly.
  

• Accumulator: A hydraulic component that stores energy in the form of pressurized gas to stabilize system pressure.
  
• Hydraulic Pump: Device that pressurizes hydraulic fluid to power machine movements.
  
• Pressure Spike: Sudden increase in hydraulic pressure that can damage components.
  
• Bladder/Piston Accumulator: Types of accumulators distinguished by the internal mechanism separating gas and fluid.
  
• Nitrogen Charging: The process of pressurizing the accumulator’s gas chamber with nitrogen for safety and performance.
  

Overview and Technical Highlights
The Hitachi EX135UR is a compact crawler excavator known for its versatility in tight urban work and robust performance across various job sites. Notable specifications:
• Operating weight: approx. 14 000 kg (14 t)
• Track width: around 600 mm
• Engine: ISUZU A‑4BG1T, delivering around 80–85 hp @ 2 100 rpm, with torque near 376 N·m
• Hydraulic system: dual pumps with relief setting at ~34.3 MPa
Technical Term Clarification
• Operating weight – Total weight including fuel and standard attachments.
• Track width – Distance between the tracks; influences ground pressure and stability.
• Hydraulic relief valve setting – Maximum pressure threshold to prevent damage; set around 34 MPa here.
• Hydraulic pump – Provides fluid power to operating functions like boom movement and slew.
Common Issues and Diagnostic Guidance
Operators of the EX135UR commonly face several maintenance challenges:
• Hydraulic power loss after extended use – Symptoms include slower track speed or reduced boom responsiveness after two or more hours. Potential causes: hydraulic fluid overheating or degradation, pump and valve wear, blocked filters, or poor cooling system performance. Regular checks of oil temperature, fluid quality, and timely filter replacement help prevent these symptoms .
• Hydraulic leaks and engine overheating – Leaks may stem from worn hoses, seals, or cylinder rods; overheating often results from clogged radiators or low coolant levels. Cleaning radiator fins and maintaining coolant levels are essential preventive efforts .
• Hydraulic fault codes (E52 and E81) –

• E52 may indicate hydraulic pump issues or faults in its control circuit (e.g., low fluid level, damaged pump, sensor wiring).
  
• E81 usually relates to pressure sensor malfunction or wiring faults. Recommended actions: inspect sensors and harnesses, verify fluid condition, and use diagnostic tools to check signal outputs .
  

• Monitor hydraulic fluid temperature during long shifts, especially in high ambient temperatures. Consider adding external oil coolers if frequent overheating occurs.
  
• Replace hydraulic filters according to or even ahead of schedule to avoid clogging and flow reduction.
  
• Regularly inspect hoses, seals, and cylinder rods for signs of leaks or wear, addressing these proactively.
  
• Keep radiator fins clean and ensure the fan operates efficiently to support cooling.
  
• When fault codes appear, use diagnostic tools to trace electrical or sensor-related faults before replacing major hardware.
  
• Use only recommended-grade hydraulic fluid and coolant to maintain proper viscosity and heat tolerance.