Doosan Infracore - Portable Power CONFIDENTIAL Doosan Infracore - Portable Power Upright Rammers Date: 4-08-08

RX-RAMMERS

How it Works

Current Models and Nomenclature RX-304H Upright Rammer 3000 lbs Impact force 4-Cycle Honda Engine RX-344H RX-304H RX-264H

Rammer Features & Benefits 4-Point isolation for component longevity Vibration reducing grips to minimize operator fatigue Self balancing design, for maximum force exertion to ground, and ease of operation Accessible throttle control Durable wooden foot reinforced with a steel plate for extended life 4-Cycle Honda engine with recoil start on all models No Oil / Gas mixing Oil Splash Lubrication reduces need for daily greasing and ensures continues protection for internal parts

Performance Specs Impact Force measured on an average – not the peak reading

Competition

2-Cycle Evaluation Good Weight to Power Ratio Minimal Parts (No Valves) Cheap to Manufacture

Phase 1 of 2-Cycle Spark Plug Fires igniting compressed air/oil/gas mixture Pistons returns to Bottom and hydrocarbon gas exits due to pressurizing of crank case Exhaust consists of Pollutant Oil (smoke) and Burned Gas Mixture Piston Bottoms out

Phase 2 of 2-Cycle Vacuum opens up Reed Valve allowing gas/oil/air mix entrance Momentum from pressurized Crank Case forces piston up, while compressing air/gas/oil mixture Intake Exhaust port Overlap allows unused oil/gasoline mixture to escape Cycle Starts over with spark plug firing every rotation

4-Cycle Evaluation Features of a Honda 4-Cycle Engine Oil Splash - Dedicated Lubrication No Gas/Oil Mixture Rugged and Reliable Air Cooled Overhead Cam

2-Cycle Disadvantages 2-cycle lifespan is not as long as 4-cycle engines The lack of a dedicated lubrication system wears the components of a 2-cycle engine faster. 2-cycle oil is expensive A typical 2-cycle engine requires approximately 4 oz. Per gallon of gasoline. 2-cycle engines are not fuel efficient 2-cycle engines produce high levels of Pollution Some environmental experts suggest that they will soon become unavailable, due to emissions legislation 2- cycle engines are significantly louder than 4-cycle engines

“I like to feel the Tamper work !” Energy Exerted to Operator Means Less Impact to ground Higher Levels of Operator fatigue Higher Bounce, less productivity Longer compaction times More Consumption of Fuel Energy In = Energy Out RX-Series is well isolated to keep the energy channeled away from the operator and into the material being compacted

3 Key Points 4-Cycle Honda engine with recoil start on all models CLEANER – QUIETER – MORE RELIABLE – FUEL ECONOMY – NO GAS/OIL Self Balancing Design CONSERVES ENERGY – REDUCES OPERATOR FATIQUE – INCREASES PRODUCTIVTY Industry Leading Impact Forces JOBSITE PRODUCTIVTY

Market $50 - 75 Million per year Earth Moving Contractors Road Builders Residential Contractors Utility/Municipal Applications Irrigation Placement Cemeteries

Mixed and Cohesive Soils Require Impact force Rammer Applications Confined Spaces Mixed and Cohesive Soils Require Impact force Molecular Attraction between particles holds soil together Impact Force shears this bond, while squeezing out air and water Before After Clays & Silts or Very fine soils

Rammer Applications Backfill around foundation forms Compaction of base & backfill around structures & footings Compacting backfill of utility line trenches Base preparation for asphalt patching Gravesite Compaction