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Summer 2012

Loader performance improvements tied to new iT4 compliant engines

Interim Tier 4 technologies will be implemented in Bobcat compact equipment to meet new air quality emissions standards. In conjunction with the engine updates, seven Bobcat 700 and 800 frame-size loaders will benefit from significant performance improvements, including operator comfort and productivity.

2012 iT4 technologies for Bobcat 700/800 frame-size loaders

2012 iT4 technologies for Bobcat 700/800 frame-size loaders

Bobcat Company continues to take steps toward complying with Environmental Protection Agency (EPA) diesel engine emissions standards. This year, the process has reached a new phase with Interim Tier 4 (iT4) — a more stringent stage of mandates — affecting larger horsepower machines, including Bobcat® 700 and 800 frame-size loaders.

As part of integrating iT4 emissions technologies, Bobcat Company upgraded some of its loader operator and performance features, applying key iT4 technologies to provide enhanced loader functionality and reporting.

Many Bobcat machines are already iT4 (25 to 75 hp) or Final Tier 4 (under 25 hp) compliant. As air quality standards become more stringent with higher horsepower machines, 2012 has ushered in iT4 for machines with horsepower ranging from 75 to 174. Bobcat Company’s equipment in this horsepower class includes 700 and 800 frame-size loaders, consisting of seven M-Series loaders.

Advancements cut more emissions, improve air quality
Interim Tier 4 compliance builds upon Tier 3 enhancements for greater emissions reductions and, in some cases, improved machine productivity and fuel efficiency. Bobcat has adopted a systems approach to achieve standards compliance for all-new iT4 700 and 800 frame-size loaders.

Engine components

With the electronic capabilities of the iT4 ECU, engine RPM recovery is faster as the engine transitions between torque and horsepower demands, providing operators with shorter cycle times and improved productivity for attachment tasks such as excavating, grading or lifting materials.

High-pressure common-rail (HPCR) fuel system
This advanced fuel-injection design regulates fuel pressure and injection timing. First, the HPCR applies high pressure to fuel to transform it into an extremely fine mist that burns more thoroughly. The rail stores the high-pressure fuel and the ECU controls multiple fuel injections during each combustion cycle.

This new instrument panel
display shows user job
statistics, including the
user’s name, fuel usage,
engine idle time and total
fuel consumption.

This new instrument panel display shows user job statistics, including the user’s name, fuel usage, engine idle time and total fuel consumption.

After-treatment systems

Diesel oxidation catalyst and diesel particulate filter systems All Bobcat 700 and 800 frame-size loaders with iT4 engines will have a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF) housed in a single canister. This system replaces the muffler for iT4 loaders. These after-treatment devices use filtering, heat and catalytic oxidation to lower emissions and reduce particulate matter (PM) in diesel engine exhaust. Through a DPF regeneration process, the high temperature of the exhaust burns accumulated PM off the DPF to keep it clean and working efficiently.

Loaders feature new functionality, enhanced performance
Updating Bobcat 700 and 800 frame-size loaders to achieve iT4 emissions compliance extended to operator comfort and control, and machine performance improvements. Several of the loaders’ features have been upgraded such as improved fuel efficiency, less noise, shorter cycle times and simplified display navigation.

Breakout and lift forces get a boost
Bobcat 800 frame-size loaders (S850 and T870) will have increased hydraulic pressures and industry-leading breakout and lift forces, resulting in shortened digging cycles. The substantially increased lift and tilt forces on the S850 and T870 will improve machine efficiency in lifting heavy loads like pallets, concrete pieces and wet clay or dirt, and rolling them back to the carry position with less machine effort. For example, the iT4-equipped T870 will have nearly 17 percent more lift breakout force than the Tier 3 model.

Less noise, better fuel consumption
The loaders’ new ECU — also instrumental in the fuel injection system — may be used in conjunction with an optional auto-idle function. Auto idle is only available for new Bobcat loaders with Selectable Joystick Controls. Auto idle allows for quieter operation and reduced fuel consumption. This feature automatically activates, causing the engine RPM to drop to idle if a loader’s functions are not used within 5 seconds. With the optional deluxe instrument panel, operators can set a preferred activation time between 4 and 240 seconds.

Horsepower management updates
The new ECU incorporated in iT4 diesel engines can interpret information that will allow horsepower management — a standard feature of Bobcat Selectable Joystick Controls — to be based on engine torque instead of engine RPM. This minimizes engine stalling and provides more travel speed at low-mid engine RPM.

New M-Series loader hydraulic control valve
The new main hydraulic control valve controls lift, tilt and auxiliary hydraulics, allowing use of the tilt function — rolling out or rolling back an attachment — regardless of auxiliary system pressure. Previously, under high amount of pressure, the auxiliary system would only allow for rolling out the attachment. The new valve improves the attachment performance for rolling out is required such as when a loader is equipped with a Bobcat industrial grapple attachment for clamping onto debris.

M-Series deluxe instrument panel updates

All deluxe instrument panels in M-Series loaders, including 600 frame-size loaders, which are not affected by iT4 in 2012, will provide simplified navigation and more in-depth information regarding operator and machine performance. Operators can set three different drive response modes and select them with simple push-button controls, and now it’s easier to change the setting in the information area. This can be found in the left panel information area.

Machine performance
A new display screen titled “Machine Performance” with three functions — viewed only by owner-level individuals — assists with monitoring key data to determine productivity rates and other project metrics.

  1. User login information: Stores usernames, plus hour and time columns record precise usage information.
  2. Overall job statistics: This screen provides a job clock, idle time, total fuel consumption and gallons per hour, reducing guesswork on project resource allocations.
  3. User job statistics: With specific user statistics, including fuel usage, engine idle time and total fuel, productivity can be precisely gauged to individuals.
  4. Vitals: Viewed by all users, this screen has been updated to display real-time fuel consumption and the time elapsed since the last DPF regeneration.
  5. Simplified panel: Viewed by all users, simple tools, including a “Home” button, allow for a quick return to the home screen. A “Layer” button shows how many clicks remain to the home screen.

Engine oil and fuel requirements
Bobcat 700 and 800 frame-size loaders with iT4 compliant diesel engines must use engine oil rated at API CJ-4, which contributes to reduced ash in the diesel particulate filter (DPF).

CJ-4 rated engine oil is common engine oil, and is not specific to iT4 compliant diesel engines. In fact, it has been used since 2006 in on-highway vehicles and is readily available through your local Bobcat dealer. Bobcat premium engine oil — 10W-30 or 15W-40 — can be purchased in a variety of volumes, and can be used with any vintage Bobcat loaders or in gasoline engines. The high-performance engine oil has superior soot-viscosity control, contributes to reduced low-temperature sludge buildup and high-temperature deposits, and helps maintain viscosity in severe temperature service.

Ultra-low-sulfur diesel fuel (15 parts per million)
It is important to remember that only ultra-low-sulfur diesel (ULSD) fuel may be used in iT4 compliant 700 and 800 frame-size loaders. ULSD has been available in the United States and Canada since 2010.

Why low-sulfur diesel fuel?
Sulfur is a significant contributor to pollutants that exist in diesel engine exhaust, and the diesel oxidation catalyst (DOC) used with iT4 engines is dependent on ULSD, which has significantly less sulfur compared to prior diesel fuels (15 ppm versus 500 ppm). Higher amounts of sulfur, than what is contained in ULSD, will ruin the DOC, requiring it to be replaced — a costly repair to the exhaust system.