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Cat’s 938H, IT38H Feature Responsive Power, Low Emissions

Wed April 09, 2008 - National Edition
Construction Equipment Guide

The new Caterpillar 938H wheel loader and IT38H with integrated toolcarrier linkage feature the Cat C6.6 engine with ACERT Technology for responsive power and low emissions. The new engine, differential lock system, load sensing hydraulics and increased lift and tilt forces deliver high performance in digging and material handling applications while limiting engine emissions to meet U.S. EPA Tier III off-highway emissions regulations and worldwide emissions standards.

The new loaders also feature the Cat fusion wheel loader coupler system. The coupler design pulls the coupler and work tool closer to the wheel loader for nearly full machine performance with the expanded versatility and flexibility of a coupler. The design moves the center of gravity closer to the machine, yet the coupler enables the loader to conveniently pick up and use a wide range of work tools. Also, the new, open frame design gives the operator improved sight lines to the work tool and load.

The loaders also have new features that aid machine health monitoring and service. The in-cab Messenger display provides real time machine performance, engine and diagnostic data to help maximize productivity and component life. The hydraulic and electrical service centers group service points and offer easy access from ground level to limit, service downtime.

Cat Product Link is standard on the new loaders. The system provides two-way information flow between the machine and Caterpillar dealer and to the owner’s desktop computer through the online dealer storefront.

Automatic Differential Lock On-the-Go

The 938H and IT38H have a new axle with standard front differential lock or an optional, automatic differential lock for both front and rear. Fully locking differentials replace limited slip and offers the advantage of reduced fuel consumption and less heat generated in the axle while delivering improved traction and reduced tire wear, according to the manufacturer.

The automatic differential lock monitors machine operation and locks during the dig cycle and when tires slip. Both manual and automatic differential lock can engage on the go.

The 938H retains the traditional Z-Bar linkage for bucket loading and optimum durability in digging applications. The IT38H features integrated toolcarrier linkage, which is designed for expanded versatility. It has parallel lift for pallet fork use and other material handling tasks. It is ideally suited for applications where different jobs are performed with one machine using a variety of work tools, such as a bucket, pallet forks and a material handling arm. A quick coupler that can be activated from within the cab is available for fast work tool changes. And for expanded versatility, the modular hydraulic valve design allows field retrofit of third and fourth functions for operating hydromechanical work tools, such as rotary brooms.

The 938H and IT38H build on the G-Series machines, the 938G II and IT38G II, which the new loaders replace. Both new machines have net engine power of 180 hp (134 kW) with peak engine power maintained through a broader engine speed range as compared to the previous models — approximately 8 percent more power at 2,100 rpm. Bucket capacities range from 3.0 to 3.9 cu. yd. (2.3 to 3.0 cu m) for the 938H and up to 3.0 to 7.0 cu yd (2.3 to 5.4 cu m) for the IT38H in low-density bulk material handling applications.

Responsive, Low-Emissions Engine

The Cat C6.6 diesel engine has displacement of 6.6 L and is an inline six cylinder. It provides cleaner, quieter operation while delivering performance and durability.

The C6.6 also has a flat and long peak power curve for quick response in the working rpm range.

At the heart of the ACERT technology is the ADEM A4 advanced electronic controller. It integrates and controls engine functions and combines with the common rail fuel system, smart waste gate turbocharger and crossflow head design for precise fuel and air delivery, which contributes to reduced emissions and strong engine performance. For enhanced fuel economy, the new loaders have the Caterpillar engine idle management system, which maximizes fuel efficiency and provides flexibility in managing idle speeds for specific application requirements.

The engine also has features to reduce maintenance requirements and increase uptime. Oil change intervals are 500 hours. The electric fuel-priming pump eases maintenance. All regular service points are accessible from ground level on the right side of the engine.

Efficient Hydraulics

Each of the loaders employs a load-sensing, variable flow hydraulic system that senses work demand and adjusts flow and pressure to match. It enables full hydraulic forces at any engine speed. The system delivers faster cycle times, with low operator effort and improved fuel efficiency.

Similarly, load-sensing steering and implement flow make more power available for rimpull and loader forces without requiring the attention of the operator. Hydraulic valving enables simultaneous lift and tilt for faster cycle times. The implement hydraulic valve design accommodates the optional ride control system, which cushions the lift arms to provide a comfortable ride and excellent material retention.

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