- ACERT™ Technology maintains engine performance, efficiency and durability while reducing emissions
- Heavy duty components withstand all operating conditions
- Strong, solid structures are built to last
Cat C6.6 ACERT
The Cat C6.6 is a 6.6 liter (403 in3) displacement, in-line six cylinder engine. The C6.6 utilizes ACERT Technology, a series of Caterpillar engineered innovations that provides advanced electronic control, precise fuel delivery and refined air management, resulting in outstanding performance and lower emissions.
The C6.6 with ACERT Technology offers a compact design with big, heavy duty engine features for outstanding durability, reliability and performance. The C6.6 incorporates a new cross flow cylinder head design, 4 valve head and an ADEM A4 electronic controller. The C6.6 also features a proven cylinder block, pistons and crankshaft.
Electronic Control ADEM A4
The Advanced Diesel Engine Management - Electronic Control Module consistently monitors important engine conditions and functions. It uses sensors throughout the engine to regulate fuel delivery and all other engine systems that require input to manage load and performance. The ADEM A4 controller is the brain behind engine responsiveness, self-diagnosis, controlling emissions and fuel economy.
Air Management
Air management is a key concept in optimizing engine performance and controlling emissions. Engines must breathe clean cool air in order to perform. To aid this, the C6.6 uses a turbocharger fitted with a smart waste gate to give precise and reliable control of the boost pressure. A new cross-flow design in the cylinder head facilitates air movement, while tighter tolerances between the piston and cylinder wall reduce blow by gases.
Fuel System
Through multiple injection fuel delivery, fuel is introduced in the combustion chamber in a number of precisely controlled microbursts. Injecting fuel in this way allows for precise shaping of the combustion cycle while reducing engine sound levels
Fuel Pump
The C6.6 uses an oil-lubricated high-pressure fuel pump to feed a common fuel rail. By using an oil-lubricated fuel pump, the C6.6 has been designed to be more tolerant of alternative fuels.
Fuel Priming Pump
An electrical fuel priming pump is located between the fuel tank and the combined water separator/primary fuel filter. The electric priming pump eliminates the need to pre-fill or manually prime filters after a change, thus reducing contamination and improving injector life.
Engine Idle Management
The Engine Idle Management System (EIMS) maximizes fuel efficiency and provides flexibility in managing idle speeds for specific application requirements. Four idle control speeds are available.
POWERSHIFT TRANSMISSION
The 938H continues to use powershift transmission technology proven on previous series. The countershaft powershift transmission features heavy-duty components to handle the toughest applications. Built-in electronic controls enhance productivity and durability.
Control Throttle Shifting
Control Throttle Shifting regulates engine speed during high-energy directional and gear changes for smoother shifting and longer component life.
Electronic Clutch Pressure Control
Electronic Clutch Pressure Control (ECPC) system modulates clutches individually to improve shift quality, component life and operator comfort. Adjustment is simplified with all solenoid valves externally mounted on top of the transmission housing.
AXLES
The 938H axles are designed by Caterpillar for durability in all operating conditions. The front axle is rigidly mounted to the frame to support the weight of the wheel loader and withstand internal torque loads as well as external forces encountered throughout operation.
The rear axle is designed to allow ± 12° oscillation. All four wheels remain on the ground over uneven terrain providing excellent stability and traction.
Integrated Braking System
The Cat exclusive Integrated Braking System reduces axle oil temperatures and improves transmission neutralizer smoothness. IBS has a direct impact on durability of the axles and brakes especially in applications involving long distances and/or heavy braking.
RADIATOR
Brazed aluminum construction provides a stronger joint for maximum durability and resistance to leaks. The 6-fins-per-inch design decreases the chance of blockage and plugging.
STRUCTURES
The articulated frame design of the 938H features a durable plate engine frame and two plate loader tower that is robotically welded. Robotic welding creates frame joints with deep plate penetration welds and excellent fusion for maximum strength and durability.
Hitch
The distance between the upper and lower hitch plates is an important contributor to machine performance and component life. The Caterpillar hitch design provides excellent load distribution and bearing life. Both the upper and lower hitch pins pivot on double tapered roller bearings - improving durability by distributing both vertical and horizontal loads over a larger surface area. The wide opening also provides excellent service access.
Engine End Frame (EEF)
The 938H uses a proven solid plate engine end frame which provides a strong, rigid structure that resists twisting and evenly distributes impact loads. The result is an extremely solid mounting platform for the engine, transmission, axle, ROPS and other accessories.
Non-Engine End Frame (NEEF)
The non-engine end frame provides a solid mounting base for the front axle, lift arms, lift cylinders and tilt cylinder. The fabricated, two-plate loader tower design reduces material packing under the lift cylinders while absorbing the forces associated with loading, twisting and material handling.
Counterweight
The two-piece counterweight is integrated into the 938H design and provides added protection for the lights by incorporating them into the top of the structure.
Linkage
The 938H linkage is a single-tilt Z-bar design. Z-bar linkage generates excellent breakout force and good rack back angle for better bucket loading and load retention.
Lift arms are solid steel, providing superior strength with an excellent front end viewing area. The proven design offers excellent dump clearance and reach.