Company Origins and Growth
The company MECALAC was founded in 1974 in Annecy‑le‑Vieux, France, initially under the name “Mécanique du Lac”.  From the beginning the firm focused on compact, multifunctional construction machines tailored for urban job sites. Within a decade it had expanded internationally and diversified its product range. By 2002 the company acquired the German loader manufacturer Ahlmann, which later became part of MECALAC’s loader business.  In June 2025 the French group Fayat Group completed the acquisition of MECALAC, signalling integration into a broader equipment‑manufacturing ecosystem.  The company today boasts manufacturing facilities in France, Germany, Turkey and the UK, and a network of over 200 authorised dealers globally.
Product Range: Excavators and Loaders
MECALAC offers a wide spectrum of machines under two major categories:
Excavators:

• Wheel excavators and wheel excavator‑loaders (e.g., 7 MWR, 9 MWR, 11 MWR, 15 MWR)
  
• Crawler/track excavators (e.g., 15 MC)
  
• Skid‑crawler machines (e.g., 6 MCR, 8 MCR, 10 MCR)
  

• Multifunctional loaders (e.g., MCL2, MCL4+, MCL6)
  
• Swing loaders (e.g., AS600, AS750, AS1000) with a rotating boom concept for tight urban sites
  
• Telescopic loaders and articulated loaders (e.g., AT900, AX700)
  
• Zero‑emission versions (e.g., e12 excavator, eS1000 loader) as part of the brand’s push into electric machines.
  

• Machines built specifically for urban or restricted‑space construction sites, where compact dimensions and manoeuvrability are critical.
  
• Swing‑loader concept: loaders with a rotating boom allowing material handling in narrow or confined zones.
  
• Multifunctional excavators/skid‑crawler hybrids (the MCR‑series) capable of performing multiple roles (excavator, loader, telehandler) with a rotating boom and tool‑carrier versatility.
  
• A strong move toward electric and zero‑emission models, aligning with industry trends in sustainability.
  

• Urban construction and infrastructure: street‑works, underground utilities, city‑centre refurbishments.
  
• Landscaping and site development where compactness and manoeuvring matter.
  
• Specialized sectors: rail‑road excavators, zero‑emission projects, multi‑functional rental fleets.
  

• When choosing a MECALAC machine, match the model to the operational profile: for tight urban sites the swing‑loader or multifunctional excavator may deliver more value than conventional machines.
  
• Consider service and dealer support: though MECALAC has global network, ensure parts availability in your region.
  
• For rental fleets, highlight machine versatility and low‑footprint – these are major selling points for MECALAC machines.
  
• For sustainability‑oriented operations, explore MECALAC’s zero‑emission models and electric versions to future‑proof your fleet.
  
• Keep an eye on residual‐value: as MECALAC expands globally and leverages Fayat’s resources, used equipment values may strengthen.
  

• Swing Loader: a loader with a boom that can rotate (often 180°) allowing material handling both sides of the machine.
  
• Multifunctional Excavator/Tool Carrier: a machine that integrates excavator, loader and telehandler functions, often via quick‑change attachments.
  
• Zero‑Emission Machine: equipment that operates without tailpipe emissions, typically battery‑electric or hybrid.
  
• Urban Construction Equipment: machines designed for narrow job‑sites, restricted space, minimal disturbance and high manoeuvrability.
  
• Footprint: ground‑space or manoeuvring clearance required by the machine on a job‑site.
  

Komatsu’s Compact Excavator Innovation
The Komatsu PC12UU is a zero-tail swing mini excavator developed in the 1990s for urban and confined-space operations. As part of Komatsu’s “UU” series, the PC12UU features an offset boom and compact counterweight, allowing it to work close to walls and structures without overhang. With an operating weight of approximately 2,800 kg and a dig depth of around 2.5 meters, it was designed for landscaping, utility trenching, and small-scale demolition.
Komatsu, founded in 1921 in Japan, has long been a pioneer in hydraulic excavator technology. The PC12UU was part of its push into the mini-excavator market, which saw explosive growth in Asia and Europe during the late 20th century. Though no longer in production, the PC12UU remains popular among private landowners and small contractors due to its mechanical simplicity and compact footprint.
Red Warning Light and Boom Lock Symptoms
A common issue reported with the PC12UU is the appearance of a flashing red warning light accompanied by the boom refusing to operate. In some cases, the override switch temporarily restores boom function, but the problem returns as soon as the switch is released. This behavior suggests an electrical fault or safety interlock preventing hydraulic activation.
The PC12UU is equipped with a series of safety sensors and interlocks designed to prevent unintended movement. These include:

• Seat switch sensor: Detects operator presence
  
• Boom lock solenoid: Prevents boom movement when safety conditions are not met
  
• Hydraulic override switch: Temporarily bypasses safety interlocks for diagnostic or emergency use
  

• Faulty seat switch or disconnected wiring
  
• Failed boom lock solenoid
  
• Low system voltage or battery degradation
  
• Ground fault or corroded connectors
  

• Check battery voltage: Ensure a minimum of 12.6V at rest and 13.8–14.2V when running
  
• Inspect seat switch wiring: Look for broken wires, loose connectors, or corrosion
  
• Test boom lock solenoid: Apply 12V directly to the solenoid to verify actuation
  
• Use override switch: If boom operates only with override, a sensor or relay is likely faulty
  
• Scan for fault codes: If equipped with a diagnostic port, use a handheld scanner to retrieve error codes
  

• Use dielectric grease on all connectors to prevent corrosion
  
• Install rodent deterrents in storage areas to protect wiring
  
• Replace aging relays and fuses every 5 years to maintain electrical integrity
  
• Secure battery terminals and clean ground points annually
  

Overview of the Model
The 2004 Demag AC 200-1 is a 220-ton all-terrain crane co-developed by Demag and Terex. AC-series cranes from Demag were designed for versatility in construction, industrial, and infrastructure projects. The AC 200-1 features a main boom length of 223 feet with a quick disconnect system, allowing operators to adapt the boom for different lift requirements. Its maximum jib configuration includes a 108-foot standard jib, a 30–56-foot double swing-away jib, and a 52-foot main boom extension to achieve a higher pivot point for complex lifts.
Specifications and Features

• Lift capacity: 220 tons
  
• Main boom: 223 feet with quick disconnect
  
• Jib: 108-foot standard, 30–56-foot swing-away, 52-foot main boom extension
  
• Counterweight: 152,000 lbs.
  
• Winches: 2
  
• Hook blocks: 7-sheave (306,000 lbs.), 3-sheave (148,000 lbs.), single line hook (22,000 lbs.)
  
• Drum rotation indicators
  
• IC-1 crane control system
  
• Air conditioning up & down for operator cab
  
• Carrier: 5-axle, drive & steering 10 x 8 x 8
  
• Tires: 20.5 R 25 including spare, currently 60% tread
  
• Quick disconnect for outriggers, dolly prepped
  
• Operating hours: approximately 4,525
  
• Mileage: approximately 30,000
  

Why the E42 Was Chosen Over a New Truck
Faced with the decision between upgrading a personal vehicle or investing in equipment for a ranch, one operator chose utility over luxury. Instead of purchasing a new F-350 diesel truck, the funds were redirected toward acquiring a Bobcat E42 compact excavator. This decision reflects a broader trend among landowners and contractors who prioritize long-term productivity over short-term convenience. With a budget of around $60,000, the E42 was selected for its balance of power, versatility, and dealer support.
Bobcat’s Compact Excavator Lineage
Bobcat, a brand under Doosan Group during the time of this purchase, has long been a leader in compact equipment. The E42 is part of the R-Series, which replaced the older M-Series with improved hydraulics, cab comfort, and serviceability. Built in North Dakota, the E42 weighs approximately 9,200 lbs and offers a dig depth of over 10 feet. It is powered by a turbocharged Tier 4 diesel engine that notably does not require DEF or active regeneration—a major advantage for users in remote areas.
Configuration and Attachments
The E42 was ordered with a cab, hydraulic thumb, and three buckets:

• 12" trenching bucket (Class 4)
  
• 24" tooth bucket
  
• 48" grading bucket
  

• Hydraulic X-Change system for quick attachment swaps
  
• 500 lb counterweight for improved stability
  
• Ripper attachment for breaking hard ground
  

Overview of the Machine
The CAT 163H Motor Grader is part of the H‑Series motor graders introduced by Caterpillar in 1995. The H‑Series, which also includes the 143H, represented a major update in drivetrain, articulation, operator comfort and electronics compared to earlier models.  The 163H specifically incorporates features like all‑wheel‑drive (on certain prefixes), advanced monitoring systems, and modular service access. Sales of the H‑Series were substantial in heavy road‑maintenance and mining support applications, thanks to their durability and capacity.
Because the 163H features advanced electronic control modules (ECMs) and diagnostic capabilities, understanding its fault‑codes is essential for reliable operation, maintenance efficiency and avoiding unscheduled downtime.
Diagnostic Code Structure and Meaning
When a fault occurs in the 163H, the machine’s monitoring system will display a code in the form: CID – FMI with sometimes a Cxx suffix. These elements mean:

• CID (Component Identifier): numeric code identifying the subsystem or sensor at fault.
  
• FMI (Failure Mode Identifier): numeric code that describes the type of fault (for example 03 = current low, 05 = current high, etc).
  
• Cxx (Count): optional suffix showing how many times the fault has been stored or cycled.
  

• CID 0324 FMI 05 on MID 030: This might indicate a specific sensor in the engine or drivetrain (CID 0324) registering “current above normal or shorted high” (FMI 05).
  
• CID 0290 FMI 03 on MID 036: Here FMI 03 means “current below normal or open circuit.”
  
• CID 1580 FMI 05 on MID 081: This suggests again “current above normal or shorted high,” but in a different subsystem (CID 1580).
  

• Step 1: Record the serial number and prefix of the grader. This determines which electrical schematics and ECM software version apply.
  
• Step 2: Using the main display or handheld diagnostic tool, note the fault codes (CID, FMI, Count) and timestamps.
  
• Step 3: Identify the subsystem indicated by the CID (engine sensors, transmission, AWD module, hydraulic system, etc).
  
• Step 4: Apply diagnostic tree based on FMI. For example, FMI 03 (current low/open) suggests wiring open circuit, bad connector, failed sensor, or ECM issue. FMI 05 (current high/short) suggests shorted wiring, sensor fault, or ground fault.
  
• Step 5: Visually inspect the wiring harness at the affected subsystem: connectors, pins, insulation, chafing, signs of overheating or contaminants.
  
• Step 6: Measure the actual electrical values: voltages and currents at sensor/module connector while running or under test conditions.
  
• Step 7: If wiring and sensor check out, move to module or ECM replacement per service manual instructions.
  
• Step 8: Clear the fault code, run the machine under load, and monitor if the fault returns. If it does, record the count and evaluate whether intermittent wiring issue is present.
  

• For the ARL prefix (serial “CAT0163HEARL…”), the machine uses a certain ECM architecture and wiring layout.
  
• Diagnostic mode entry: On 143H/163H machines the setup mode for display module is mode 10 (rather than mode 9 used on other graders).
  
• When reading codes, the “Cxx” suffix tells how many times the fault has been recorded—higher counts may indicate a chronic issue rather than a one‑off.
  

• With electronic control modules becoming more sophisticated in graders, fault‑code interpretation is now a vital part of Preventive Maintenance (PM) rather than only reactive repairs.
  
• For H‑Series machines (including the 143H and 163H), there is increased emphasis on documenting serial‑number prefix when ordering parts or electrical diagrams because earlier prefixes (5AK, ARL) differ in architecture.
  
• Service documentation increasingly advises higher‑level fault codes (e.g., CID 0573, FMI 13) as calibration or software update requirements rather than pure wiring faults.
  

• Always log the full code including CID, FMI and Count and correlate with hours, load conditions and environment.
  
• When a fault recurs (Count > 5 or 10), assume intermittent wiring or module failure rather than one‑time glitch.
  
• Keep wiring harness sections clean, dry and free of abrasion; ensure proper routing around articulation and frame pivots.
  
• Use the correct service manual for your serial‑prefix; mismatched prefixes may have incorrect code descriptions.
  
• Clear fault codes after repair, and run a full working cycle under load within 24 hours to confirm no re‑occurrence.
  

• CID (Component Identifier) — Numeric code identifying which subsystem or sensor generated the fault.
  
• FMI (Failure Mode Identifier) — Numeric code that describes symptom of failure (open circuit, short, current high, etc).
  
• Cxx (Count) — Suffix showing how many times the fault has been logged by the ECM.
  
• Serial‑Prefix — Alphanumeric code at the start of the machine’s serial number that defines version, region and electronic architecture (e.g., “ARL”, “5AK”).
  
• ECM (Electronic Control Module) — Computer module that monitors and controls machine functions and records fault codes.
  

Understanding the CAT 226 and 246 Engine Families
The Caterpillar 226 and 246 skid steer loaders are part of CAT’s compact equipment lineup, designed for versatility in construction, landscaping, and agriculture. The 226 is a smaller unit, typically powered by a naturally aspirated CAT 3034 engine, while the 246 is a larger machine equipped with a turbocharged version of the same engine family—often the 3034C.
Both engines belong to the 3000 Series, developed by Caterpillar for compact machines. The 3034 is a four-cylinder diesel engine with mechanical fuel injection, while the 3034C adds a turbocharger and upgraded internals to handle higher combustion pressures and increased horsepower. Despite sharing a base architecture, the turbocharged version introduces dimensional and performance differences that complicate direct swaps.
Physical Fitment and Turbo Clearance Issues
One of the first challenges in transplanting a 246 engine into a 226 is clearance under the radiator and engine bay. The turbocharger adds height and bulk, which may interfere with the 226’s compact hood and cooling system layout. In most cases, the turbo cannot fit without modifying the radiator shroud or relocating components.
Some operators attempt to convert the turbocharged engine into a naturally aspirated configuration by swapping manifolds, fuel systems, and external components. This approach assumes that the internal components—such as pistons and crankshaft—are compatible. However, turbo engines often use reinforced pistons and different compression ratios, which may affect performance and longevity when de-turboed.
Serial Number and Arrangement Number Matching
To verify compatibility, technicians rely on serial numbers and arrangement numbers. In one example, a 226 with serial number 5FZ1452 had a 3034 engine with arrangement 144-6194, while the donor 246 had serial number 5SZ00661 and engine arrangement 147-1234. These arrangement numbers indicate differences in fuel delivery, cooling, and mounting hardware.
Even if the base engine block shares casting numbers, the arrangement defines how the engine interfaces with the machine—such as throttle linkages, hydraulic pump mounts, and wiring harnesses. Without matching arrangements, a swap may require extensive retrofitting.
Internal Compatibility and Upgrade Logic
Some mechanics argue that if the internal components are similar, the turbocharged engine can be converted by removing the turbo and installing naturally aspirated manifolds. This “hillbilly logic,” as one operator called it, assumes that the turbo engine’s internals are simply upgraded versions of the NA engine.
While this may work in theory, differences in oil pump design, piston crown geometry, and fuel mapping can lead to poor performance or premature wear. If the turbo engine was designed for higher output, detuning it may result in inefficient combustion and increased emissions.
Expert Opinions and Practical Advice
Experienced technicians caution against assuming interchangeability without detailed part number cross-referencing. One mechanic noted that the 246’s 3034C engine shares little with the 226’s 3024 engine used in later models. Even within the 3034 family, early production inconsistencies and undocumented changes make swaps unpredictable.
If the goal is to restore a 226 with a failed engine, the best approach may be:

• Source a direct replacement engine with matching arrangement
  
• Rebuild the original engine if the block is salvageable
  
• Sell the turbocharged engine and use proceeds to fund a compatible unit
  

Overview of Screeners
Screeners are essential machinery in recycling, compost, topsoil processing, and aggregate industries. They separate material by size to improve product quality and efficiency. Two common types are trommel screeners and star screeners. Trommels feature a rotating cylindrical drum, ideal for compost and topsoil, while star screeners use star-shaped elements for fine, sticky, or moist material. Companies like McCloskey, Powerscreen, Astec, and Sandvik dominate the market, offering machines ranging from portable units to high-capacity industrial screeners.
Material Considerations
The type of material heavily influences screener choice:

• Compost/topsoil: Trommel screens handle 1/4" to 3/8" sizing effectively.
  
• Peat or sticky material: Star screeners excel, though replacement stars are costly.
  
• Gravel, bark, wood chips: Trommels like the McCloskey 621 series can process 40–60 yd³/hour depending on moisture and density.
  

• McCloskey: Reliable engineering, low maintenance, units like the 412 RT have operated over 10 years with minimal issues. Trommel models are suitable for both wet and dry compost, topsoil, and other organics.
  
• Powerscreen/Finlay: Both Terex-owned; users report recurring issues and frequent trade-ins.
  
• Astec: Dealer-favored, strong support, solid for heavy-duty applications.
  
• Sandvik: High performance but parts and service can be slower.
  

• Screen size and output capacity: Match machine to expected volume to avoid bottlenecks.
  
• Portability: Track-mounted units facilitate job site mobility.
  
• Moisture content: High moisture reduces efficiency; machines may need anti-clog features.
  
• Maintenance requirements: Ease of replacing screen media, bearings, and drive belts reduces downtime.
  
• Cost of consumables: Star replacements, trommel panels, and hydraulic components influence total cost per hour.
  

• Evaluate material type and moisture before purchase.
  
• Consider brand reputation, parts availability, and dealer support.
  
• Plan for routine maintenance and spare parts inventory.
  
• Test a demo unit if possible to match machine capacity with operational needs.
  
• Document throughput and screen wear for better planning of future purchases.
  

Understanding Mulching Head Types and Tooth Configurations
Mulching heads are specialized attachments designed for land clearing, vegetation management, and forestry work. They are typically mounted on skid steers, compact track loaders, or excavators. The two most common tooth configurations are:

• Chipper teeth: Designed for high-speed cutting and producing fine mulch. Ideal for softwood, brush, and lighter vegetation. However, they are more vulnerable to damage when working in rocky terrain.
  
• Carbide or asphalt-style teeth: Built for durability in abrasive environments. These teeth are better suited for rocky or mixed-material conditions but tend to produce stringier mulch and may be less efficient in clean wood.
  

• Authorized dealers: Brands like FAE, Loftness, Fecon, and Denis Cimaf have dealer networks that offer new equipment, service, and warranty support.
  
• Used equipment marketplaces: Machinery Trader, IronPlanet, and Ritchie Bros. often list used mulching heads, including repossessed or trade-in units at discounted prices.
  
• Local equipment yards: Regional dealers and rental companies may have used attachments for sale, especially during fleet turnover periods.
  
• Direct from manufacturers: Some brands sell directly to end users, offering factory support and customization options.
  
• Online classifieds: Craigslist and Facebook Marketplace can yield deals, but buyers should inspect equipment carefully and verify compatibility.
  

• Rotor condition and balance
  
• Tooth wear and availability of replacements
  
• Hydraulic motor seals and case drain line
  
• Frame integrity and welds
  
• Compatibility with your carrier’s hydraulic flow and pressure
  

• Minimum flow: 30–40 GPM for most high-performance heads
  
• Pressure: 3,000–5,000 PSI depending on the model
  
• Case drain requirement: Some heads require a low-pressure return line to prevent seal failure
  

Overview of the Equipment
The Magnum Mulcher is a robust forestry‑attachment made for skid‑steers and track loaders, designed by Bradco for heavy land‑clearing, utility‑line, and brush‑removal work. The unit features a wide rotor drum fitted with a set of replaceable mulching teeth that engage and shred vegetation and small trees. Models such as the MM60 Series II are rated for hydraulic flows of around 30–45 gpm at 3,000‑4,000 psi, accept 44 claw‑style teeth in the 73″ width version, and weigh approximately 2,530 lb.
Given the harsh environment in which these attachments work—wood, brush, dirt, hidden stumps, rocks—teeth wear and breakage is inevitable. Proper replacement and maintenance of the teeth are critical for performance, productivity, and safety.
Why Tooth Replacement Matters
Mulcher teeth are the “ground‑engaging tools” (GET) of the mulcher. When they are worn:

• Cutting efficiency drops, meaning slower progress and higher fuel/hydraulic cost.
  
• The rotor may become unbalanced if many teeth are missing or unevenly worn, causing vibration, extra bearing load, risk of failure.
  
• The machine may encounter hidden hard obstacles with a dull or missing tooth, increasing the chance of rotor damage or broken shaft.
  

• Claw‑style tooth – A tooth shaped with a claw profile, useful in softer woods to “grab” and shred.
  
• Carbide‑tipped tooth – A harder wear version of tooth incorporating tungsten carbide for longer life in abrasive or hardwood conditions.
  
• Rotor balance – Ensuring the rotor drum remains dynamically balanced so vibration and lateral loads are within safe limits.
  

• Tooth count: For example, the 73″ unit uses 44 teeth.
  
• Tooth type matched to conditions:
  • For softer woods or brush: reversible claw‑style steel teeth might suffice.
    
  • For hardwoods or abrasive soils: carbide‑tipped teeth recommended for extended life.
    
• Mounting hardware: bolts, washers, tooth‑holder lugs must be in good condition; many kits come with fine‑thread metric bolts and lock washers.
  
• Weight and shipping: tooth kits may weigh ~200 lb and ship truck freight.
  

1. Prepare and clean
   • Park machine on solid level ground, lower mulcher, relieve hydraulic pressure, turn off machine and isolate energy.
     
   • Clean rotor area, remove rust, inspect tooth holders and drum lugs for damage.
     
2. Remove old teeth
   • Loosen and remove bolts holding each tooth. Inspect holders for distortion, cracked welds or wear.
     
   • Remove broken or worn teeth; count how many remain good and mark positions if needed for balancing.
     
3. Inspect rotor and holders
   • Check rotor for dents, bends, suspension of bearings; ensure lugs are all intact.
     
   • If missing lugs, repair by welding to spec and restore original geometry (important for rotor balance).
     
4. Install new teeth
   • Use the new kit: e.g., for a 72″ unit, a 54‑piece reversible claw kit is available.
     
   • Use proper bolts and lock washers; torque to manufacturer spec.
     
   • If reversible teeth, install with the “cut” side facing forward; mark direction.
     
5. Balance check
   • After installing all teeth, spin the rotor by hand or slowly with machine; feel for vibration or wobble.
     
   • If vibration present, check for missing or mismatched tooth weights; correct by replacing or adding weight.
     
6. Final startup and test
   • Start machine, slowly engage mulch head into brush, monitor for unusual vibration, bearing noise, or loosening hardware.
     
   • After initial hour of operation, re‑check bolts for proper torque.
     

• Rotate or reverse reversible teeth when wear appears on one edge — doubling life.
  
• Keep spare tooth bolts and lock washers on hand; many jobs remote.
  
• For extreme abrasion, consider carbide‑tipped teeth — though more expensive per unit they last longer and reduce total cost per hour.
  
• Track hours and teeth replacements; some operators note productivity drops significantly after ~1000 hours of brush/brush‑with‑stump work if tooth wear not addressed.
  
• Inspect after hitting hard objects (stumps, steel). A single heavy impact may unbalance rotor or crack holders.
  

• The forestry attachment sector has seen growth as utility line clearing and wildfire mitigation become larger public‑works priorities. Mulcher manufacturers are offering more modular tooth‑kit options to reduce inventory and downtime.
  
• Wear‑material technology (e.g., tungsten‑carbide inserts, heat‑treated steels) is evolving; some aftermarket suppliers now offer “mix‑and‑match” teeth allowing operators to install carbide teeth where most wear occurs and standard steel elsewhere.
  
• Rental fleets prioritise quick tooth‑kit changes to minimise machine idle time — some claim less than one hour to swap full tooth set on standard 60″–72″ widths.
  

• Before ordering parts, match your mulcher width (60″, 72″ etc.), tooth count (44, 54 etc) and required tooth style (claw vs carbide).
  
• Ensure mounting bolts and lock washers match OEM spec; reuse only if undamaged.
  
• When installing, maintain tooth direction, torque bolts to spec, verify rotor balance.
  
• After first few hours of use with new teeth, re‑check bolts.
  
• Document installation date, hours of use, and environment; plan next inspection and replacement based on actual hours and wear.
  

• Mulcher Rotor – The rotating drum in the mulcher attachment that holds the teeth and does the cutting/shredding.
  
• Tooth Holder Lug – The welded mount on the rotor where each tooth is bolted.
  
• Reversible Tooth – A tooth design that can be flipped after one side wears, doubling service life.
  
• Global Balance – Ensuring the rotor’s mass distribution is even so that at high RPM it does not cause harmful vibration.
  
• Abrasive Conditions – Work environment where soil, sand, rock or hard woods accelerate wear of cutting components.
  

The Case 855D and Its Role in the Track Loader Market
The Case 855D was introduced in the mid-1980s as a heavy-duty track loader designed for general construction, demolition, and land clearing. It was powered by the Cummins 6-590 diesel engine, a naturally aspirated inline six-cylinder known for its durability and torque. With an operating weight of approximately 34,000 pounds and a 4-in-1 bucket option, the 855D offered versatility for contractors who needed both dozing and loading capabilities in a single machine.
Case Construction Equipment, a division of CNH Industrial, had already established a strong presence in the loader market with earlier models like the 850B. The 855D built on that legacy with improved hydraulics, better operator visibility, and a more robust undercarriage. Though production ceased in the early 1990s, many units remain in service today, particularly in rural and forestry applications.
Engine Performance and Known Strengths
The Cummins 6-590 engine is widely regarded as nearly indestructible when maintained properly. It delivers around 125 horsepower and is known for its mechanical simplicity. Unlike turbocharged engines, the naturally aspirated 6-590 avoids heat stress and complex boost systems, making it easier to service in the field.
Operators report that these engines often exceed 10,000 hours with only routine maintenance. However, oil pan corrosion is a known issue, especially if belly pans are not regularly cleaned. Accumulated debris and moisture can lead to rust-through, causing oil leaks and potential engine damage.
Transmission and Final Drive Inspection Tips
The 855D uses a powershift transmission that should be tested both cold and hot. Key inspection points include:

• Shift timing: Transitions between gears should be smooth and consistent
  
• Pressure checks: Measure transmission pressure at idle during range shifts to detect internal wear
  
• Mounting bolts: Access holes in the chassis allow inspection of transmission and final drive mounting bolts—ensure none are missing or loose
  
• Final drive housings: Check for thinning or cracking, especially on high-hour machines
  

• Smooth bucket and boom operation
  
• No hesitation or surging
  
• Consistent pressure across all functions