New pipelayer engine electronically controlled, offers added power, reduced emissions
The new 561N pipelayer features an electronically controlled engine with more power and reduced emissions, new fingertip controls and better viewing area for the operator, and improved serviceability. The 561N replaces the 561M.
The new pipelayer uses the Cat 3126B ATAAC diesel engine rated at 123 net hp (92 kw), a 12% increase over the previous model for improved controllability and maneuverability—especially in stringing operations. The engine meets new exhaust emission regulations.
It retains features such as hydraulic drawworks, two-speed load line, extendable counterweight, elevated sprocket design, planetary power shift transmission, and modular component design.
The turbocharged engine uses air-to-air aftercooling and features Caterpillar's HEUI fuel system and three valves per cylinder.
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The firm says the result is high torque and responsive performance as well as reduced exhaust emissions, which meet US Environmental Protection Agency Tier 2, European Union Stage II, and Japan MOC Step 2 regulations.
The electronic control module, ADEM III, controls and monitors all major engine functions and regulates the HEUI fuel system. HEUI provides high injection pressure and short injection duration for fast response, low fuel consumption, emissions control, easier cold starts, improved torque rise, and reduced combustion noise. No derating is required for the 561N at altitudes of as high as 15,100 ft; automatic derating occurs at higher altitudes.
A Poly-Vee serpentine belt is used on the engine. The power train to engine link features controlled throttle shifting for better modulation of gear changes and smoother shifts.
Fingertip control (FTC) combines steering, machine direction, and gear selection into a single control system. An electronic clutch and braking steering system incorporates low-effort fingertip levers that allow the operator to work precisely in close areas and around structures and obstacles.
Autoshift and autokickdown help improve operator efficiency, and an electric vertical adjustment of the FTC control group positions the operator's arm for efficient ergonomics. The inclusion of FTC on the 561N gives the machine steering commonality with other Caterpillar tractors and helps operators adjust more easily to operating both types of equipment.
Operator visibility and access are enhanced on the 561N. Modern styling includes a rounded shape and tapered hood that also enhance sight lines for. the operator. The precleaner now is located below the hood for improved sight lines, and components including hinges, bolts, and door locks are hidden to enhance machine appearance.
A ladder is located on the left side of the machine for direct access to the operator station and for expanded right-side viewing area.
A hinged engine door increases engine and service access, and enlarged service panel doors provide easier access to other maintenance areas.
With three undercarriage arrangements, the unit offers flexibility for pipelaying in a variety of ground conditions. Choices allow for narrow machine transportability with an overall width of less than 118 in. to a low ground pressure (LGP) arrangement for working in soft or spongy conditions.
Optional LGP arrangements decrease ground pressure by as much as 30% over the previous model, resulting in an increase in flotation.
Major components are designed as modules and most can be removed without disturbing or removing other components.
Two groups of remote taps are available for measuring and troubleshooting the hydraulic system. One is located in the right fender and the other behind the transmission guard on the rear of the machine.
Left side enclosure doors provide access to other components including an optional machine security system. Improved hydraulic line routing reduces the chance of hose failures and improves serviceability, the firm says.
Source: Caterpillar Inc., 100 NE Adams St., Peoria, IL 61629.
