Tier 4: Frequently Asked Questions
Q: How has Bobcat already been addressing Tier 4?
A: Federal Interim Tier 4 (iT4) emission regulations in 2012 affecting compact equipment apply to machines using 75.1 to 174.3 hp engines. The Bobcat machines affected are the seven compact loader models offered in the 700 and 800 platforms. This represents 15% of Bobcat’s total product offering, while 85% of Bobcat machines are unaffected by emission regulations in 2012.
Bobcat machines under 25.5 hp have been Final Tier 4 compliant since 2008. Bobcat machines equal to or greater than 25.5 hp, but less than 75.1 hp, have been iT4 compliant since 2008. Bobcat machines 75.1 to 175 hp will reach iT4 compliancy in 2012. The chart below also shows general compliancy dates for past and future diesel emission tiers.
|All Tiers - Compact Equipment|
|Less than 25||Tier 1||Tier 2||Tier 4|
|25 - 75||Tier 1||Tier 2||Interim Tier 4||Tier 4|
|75 - 175||Tier 1||Tier 2||Tier 3||Interim Tier 4||Tier 4|
|Diesel Fuel||Low Sulfur||Ultra-Low Sulfur|
Q: How has Bobcat addressed Interim Tier 4 (iT4) for higher-powered engines and what technologies were used?
A: Bobcat has worked hard and been successful reaching iT4 compliancy for our products in the 75.1 to 175 hp class in 2012. The 700 and 800 platform M-Series compact loaders were affected by the iT4 regulations and all models are now compliant.
Technologies used in these models include:
Electronic Control Unit (ECU)
The ECU controls the clean diesel technologies inside the iT4 700 and 800 platform loaders, resulting in cleaner exhaust. The ECU reduces emissions, noise and operating costs while improving performance. Engine recovery is faster when transitioning between torque and horsepower demands, and operators will experience shorter cycle times and better productivity when performing tasks like digging, grading or lifting materials.
High-Pressure Common Rail Fuel System (HPCR)
The fuel injection system is a major area of focus for advancement towards clean-operating diesel engines in 700 and 800 platform loaders. HPCR is an advanced fuel injection design that better regulates fuel pressure and injection timing, is controlled by the ECU and is incorporated into Bobcat 700 and 800 platform loaders.
Diesel Oxidation Catalysts (DOC) and Diesel Particulate Filters (DPF)
The diesel oxidation catalyst is a special catalyst that reacts with engine exhaust upon contact and transforms some of the particulate matter emissions in the exhaust into harmless substances like water and carbon dioxide.
The diesel particulate filter is a special "ceramic wall flow" filtration system that further separates particulate matter from the engine exhaust. The DPF uses a cleaning process called "regeneration" to burn off accumulated particulate matter and is monitored and controlled by the ECU.
DOC/DPF systems are highly effective at removing particulate matter from exhaust and are incorporated into Bobcat 700 and 800 platform loaders.
Q: Bobcat machines with Interim Tier 4 engines be more expensive?
A: Bobcat products such as the MT52 mini track loader, the S70 skid-steer loader, CT122 compact tractor, 418 and 324 compact excavators and diesel-powered utility vehicles (6 models) have already been Final Tier 4 compliant for quite some time. These products had very minor increases in price due to Tier 4. In some other cases, advancements needed in engines and other systems external to the engine for IT4 will add expense. However these technologies may also allow improvements to engine noise, sound levels, performance and diagnostic capabilities.
Q: What more will Bobcat need to do to comply with Final Tier 4 regulations?
A: Bobcat remains fully committed to complying with all Final Tier 4 regulations. The remaining two steps in this process are to bring 25.5 to 75.1 hp machines into Final Tier 4 compliance by 2013 and 75.1 to 174.3 hp machines into Final Tier 4 compliance by 2015.