623G Wheel Tractor Scraper

Overview of the 623G

Quick loading, high travel speeds and the ability to load and spread on the run yield fast cycle times, allowing Cat Elevating Scrapers to consistently deliver high productivity at the lowest cost per ton.

Specification Summary

Flywheel Power: Tractor/Scraper

246 kW (330 hp)

Scraper Capacity: Heaped

23 yd3

Top Speed (Loaded)

32 mph

Tractor Engine

Cat® C15 ACERT

Engine

Scraper Bowl

Transmission

Weights

Elevator

Dimensions

Steering

Service Refill Capacities

Hydraulics

Standards

Service Refill Capacities – Tractor

Service Refill Capacities – Scraper

Weights – Machines meeting U.S. EPA Tier 4 Interim/EU Stage IIIB emission standards

Tractor Engine – U.S. EPA Tier 4 Interim/EU Stage IIIB

Tractor Engine – Prior U.S. EPA Tier 3/EU Stage IIIA configuration*

Weights – Machines achieving prior U.S. EPA Tier 3/EU Stage IIIA emission levels

Power Train - Engine

The new ACERT technology and proven components are electronically integrated to achieve new levels of performance and efficiency.

C15 Tractor Engine

The Cat C15 Electronically Controlled Unit Injection (EUI) diesel engine powers the tractor. With dual horsepower capability, it provides high power and torque rise for excellent lugging in tough loading conditions. The C15 is designed for long hours of continuous operation with high displacement and low RPM ratings.

Dual Horsepower

Electronic engines deliver increased power when the auger is engaged or when the machine is in the roading gears, providing quicker acceleration on the haul road.

ACERT Technology

The C15 electronic engine with ACERT technology meets US EPA Tier 3 and European Union Stage III exhaust emission regulations. ACERT technology reduces emissions during the combustion process by using advanced technology in the air and fuel systems, in conjunction with integrated electronics. Caterpillar meets emission regulations at the combustion source rather than recycling exhaust gases.

Electronic Control Module (ECM)

The ECM responds to operator commands and engine sensor input to optimize engine and machine performance. This advanced engine management software controls and protects the engine at all times against cold starts, high altitude operations and air filter plugging by monitoring:

• injection timing and pressure
• engine cooling fan speed
• ether starting aid
• hydraulic pumps

Electronic Unit Injection (EUI)

Electronic injection provides complete control over injection timing, duration, rate and pressure under changing conditions over the entire engine operating range. The EUI controlled engine delivers:

• improved fuel efficiency
• more power
• decreased smoke and emissions
• faster hot and cold starts
• better high altitude performance
• less noise than mechanical injector engines

Engine Speed Lock

Allows the operator to maintain a given engine speed without using the accelerator pedal. This eliminates operator fatigue associated with holding the pedal down for extended periods of time. An on/off rocker switch enables the Speed Lock feature, and a dashboard lamp indicates the feature is active. Moving the rocker switch to the off position, or activating the service brakes or the retarder, disables the feature.

Automatic Belt Tensioning

Both the tractor and scraper engines now have automatic belt tensioning rather than manual tensioning. Other engine improvements include:

• reducing the number of belts (from five to two on the tractor, from four to two on the scraper)
• eliminating the servicing for fan drive bearings

Power Train - Transmission

Integrated electronics allows the machine to monitor the power train which reduces stress as well as provides a better ride to the operator.

Transmission

Electronically controlled Caterpillar planetary powershift transmission with eight forward and one reverse speed. Tractor gears 1 & 2 operate in converter drive for increased torque capability during cut and fill operations. Gears 3-8 operate in direct-drive for drive train efficiency during the haul. Reverse gear operates in converter drive.

Brake Performance

Redesigned axles on both the tractor and scraper accommodate wider brake shoes and brake drums, improving brake performance as much as 20 percent and reducing brake and drum wear as much as 75 percent.

Final Drives

Outboard-mounted, planetary design final drives reduce torque loads on the other power train components. Large-capacity, double-row roller bearings and Caterpillar Duo-Cone® seals deliver exceptional reliability in the toughest applications.

Electronic Controls

Instant response optimizes machine performance, and advanced diagnostic capabilities maximize machine availability.

Simplified System

The electrical system has been redesigned to utilize three electronic control modules (ECM) on the tractor instead of four.

Improved Serviceability

Combined monitoring systems, easy access diagnostics and more durable components make routine maintenance and servicing simple and fast.

Fuel Economy

Electronic controls yield a fuel savings by optimizing the timing setting for varying conditions. The ECM matches timing to the load on the engine, engine speed and temperature.

Product Link Ready

Product Link is a wireless system that allows the customer to track machine data such as location, service meter hours as well as machine health information. The system has the capability to automatically issue alerts when the machine is being operated beyond owner defined time and location limits.

Reduced Exhaust Smoke

The ECM reads electronic sensors to determine the optimum fuel/air ratio, then precisely controls fuel during cranking, starting and acceleration to reduce smoke. The ECM system is faster and more efficient than mechanically controlling the governor rack position.

Operator Station

Redesigned for enhanced operator comfort and productivity.

Multi-Adjustable Seat

The Cat Comfort Cloth Seat has an adjustable seat and armrests for maximum operator comfort.

• Swivels and locks in four positions (0º, 10°, 20° and 30º) providing the optimum operating position in the cut or on the haul.
• Fore/aft and vertical height adjustment to accommodate various sized operators.

Revised Steering Column

Increases legroom a full 3.5 inches (89 mm), and reduces knee contact points.

Standard Air Conditioning

Gives the operator a comfortable workstation in various types of weather. Relocated ventilation louvers improve airflow to the operator.

Storage And Amenities

Convenient storage location includes space for a lunch box and first aid kit. The cab also has a cup holder as well as an ashtray.

Visibility

Hood and front shroud width increased to accommodate the low emission engine, the air-to-air aftercooler (ATAAC), ether starting aid, and lights. Hood corners are sloped to maintain the excellent visibility.

Single Lever Implement Control

Simple and easy to operate, the joystick enhances the productivity of operators of all skill levels. Requires less force to control the critical scraper functions and requires less lever travel. Grab handle/hand rest next to joystick controller so operator has a place to rest hand while on the haul and return roads. 1) Bowl (forward & back) 2) Ejector (side to side) 3) Thumb rocker switch

• Apron position
• Elevator direction, speed 4) Transmission Hold 5) Cushion Hitch 6) Trigger* (not shown here - is on front of joystick)
• Auger (on/off)
• Elevator (on/off, resume)

Instrument Display Panel

Features a quad-gauge layout showing engine coolant temp, transmission/torque converter oil temp, fuel level, and system air pressure.

Engine Speed Lock Controller

Enhances operation during long haul cycles by allowing the operator to maintain a desired engine speed without maintaining pressure on the accelerator.

Simplified Transmission Control

Simplifies gear selection (1st, 2nd, Drive and Reverse) and allows operator-defined top gear control. Relocating the gear control to the rear increases operator legroom.

Structures

Superior structural design and construction optimize performance and reliability.

Cushion Hitch

The electronically actuated cushion hitch incorporates a parallelogram-type linkage for exceptional strength with nitrogen accumulators to deliver a smooth ride for enhanced operator comfort.

• controlled oil flow dampens rebound oscillation
• leveling valve automatically centers piston in cylinder for all loads
• steel castings are used extensively to eliminate many welded joints and increase strength
• double-kingbolt design withstands high external forces and simplifies installation and removal

Scraper Bowl

Designed for optimum loading, material retention and ejection.

Redesigned Bowl

Excellent productivity with a 10% increase in bowl capacity from the F series, improved draft arm protection, and better load retention. Low-profile design of the bowl offers less resistance to incoming materials, while cellular construction adds strength and dent resistance to bowl sides and floor.

Bulldozer Ejection System

Combines constant spreading control while minimizing carryback material. The floor of the bowl retracts as the ejector moves forward, allowing the operator to precisely control the flow of material.

Cutting Edges

May be adjusted according to job conditions. For most efficient loading, use the thinnest edge that provides satisfactory wear life and impact resistance.

Caterpillar Ground Engaging Tools (G.E.T.)

A wide variety of Ground Engaging Tool (GET) options, such as standard, serrated, and abrasion resistant material (ARM), are available to optimize scraper loading in various materials. Most are reversible to provide long life and reduced operating costs. Contact your Cat Dealer to learn more about the best tools for your applications.

Material Application

The 623G is ideal for windrowing, blending material as well as breaking up vegetation in stripping operations.

Elevator Mechanism

Self-loading capability, versatility and excellent material handling characteristics.

Versatility

The 623G is ideal for windrowing, blending material as well as breaking up vegetation in stripping operations.

Material Handling

The elevator lifts material off of the cutting edge and carries it to the top of the elevator and then dumps the material into the bowl. Blending the material helps eliminate voids in the bowl for consistent payloads and even unloading.

Drive Sprockets

Split, bolt-on drive sprockets eliminate the need to remove the chain during servicing and require no lubrication. Hydraulically adjustable chains have exceptional pull strength for dependable performance and long life.

Throat Opening

Adjustable up to 610 mm (24"), enables faster loading and greater material control.

Low-Maintenance Rollers

Carrier rollers and chain idlers are heat-treated for wear resistance. Fixed elevator rollers require no adjustment, reducing maintenance. Sealed and lubricated floor rollers are maintenance free. The direct acting floor mechanism eliminates the drag link.

Two-stage Ejection System

Allows the floor to slide backward while a dozer-type ejector moves forward (toward the cutting edge), cleaning the entire bowl in one motion.

Implement Pumps

High-pressure, engine-driven implement pumps enable the operator to take deeper cuts and load in a shorter distance with less elevator stall.

Elevator Controls

The operator has variable control of the elevator to match the speed of the elevator to the material conditions for increased productivity.

Single-pivot Design

The single-pivot elevator design improves the load profile which allows the machine to achieve consistent payloads.

Chain Adjustment

Maximize chain life quickly and easily with just a grease gun.

Serviceability

Count on Caterpillar for simplified service and the most productive uptime.

Grouped Service Points

Maintenance and service points for the engine are grouped on the right-hand side for easy access. They include the engine air cleaner, engine oil check and fill, fuel filters and priming, coolant level sight glass, window washer bottle, air conditioning dryer cartridge, ether starting aid canister, engine oil filter, fan drive lubrication, and sampling ports for the engine oil and coolant.

• Spin-on fluid filters for all but the main hydraulic filter
• Cab wiring harness redesigned and relocated for better serviceability

Electronic Monitoring System (EMS III)

Monitors machine status and provides real-time information to the operator including warnings of problems identified by the Electronic Control Modules.

Implement Valve Relocation

The implement valve has been relocated from the tractor to the top of scraper draft tube, reducing the number of hoses and tubes that cross over the gooseneck. The move reduces potential leak points, and improves service access.

One Piece Power Block

Jumpstart receptacle and disconnect switch are integrated into a one-piece power block for better electrical integrity and serviceability. The disconnect switch, with a lockable cover, disables all power from the batteries and jumpstart functions.

Electro-Hydraulic Implement Control

Simplifies serviceability by removing the cab pilot valve and associated lines, which also improves reliability and reduces noise. The high efficiency electro-hydraulic pilot oil filter provides cleaner oil for the pilot system.

Scraper Electrical Harness

A ribbon wiring harness replaced the cable harness for improved wear and durability. Its increased flexibility oscillates with the machine, and polyurethane boots offer better protection against the elements.

Access Doors

The tractor has a standard two-piece door on the right side for better access to service points. The hood, hinged on the front and supported by spring struts, easily opens towards the front of the machine, for better access to the top of the engine.

Electronic Technician (Cat ET)

The Caterpillar Electronic Technician (Cat ET) Service Tool is useful in troubleshooting existing problems or identifying potential problems by displaying:

• Real-time pressures, temperatures, fuel settings and diagnostic messages
• Historical data such as engine over-speeds, overheating, low oil pressure and air filter restriction events
• More detailed information to the service technician who can access ET via a laptop computer

Easy Access Diagnostics

Diagnostic codes are accessible through the EMS main display module, via the Cat ET. Relaying this information to the service technician can let him know which tools, troubleshooting guides, and possibly even replacement parts to bring to the machine.

Customer Support

Cat dealer services help you operate longer with lower costs.

Product Support

You will find nearly all parts at our dealer parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize machine down time. Save money with genuine Cat Reman parts. You receive the same warranty and reliability as new products at substantial cost savings.

Machine Selection

Make detailed comparisons of the machines under consideration before purchase. Cat dealers can estimate component life, preventive maintenance cost, and the true cost of lost production.

Purchase

Look past initial price. Consider the financing options available as well as day-to-day operating costs. Look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run.

Customer Support Agreements

Cat dealers offer a variety of product support agreements, and work with customers to develop a plan that best meets specific needs. These plans can cover the entire machine, including attachments, to help protect the customers investment.

Operation

Improving operating techniques can boost your profits. Your Cat dealer has videotapes, literature and other ideas to help you increase productivity, and Caterpillar offers certified operator training classes to help maximize the return on your machine investment.

Maintenance Services

Talk to your dealer about the range of available maintenance services. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as SOSSM Analysis and Coolant Sampling and Technical Analysis help avoid unscheduled repairs.

Replacement

Repair, rebuild or replace Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

Standard Equipment

• ELECTRICAL
• OPERATOR ENVIRONMENT
• POWER TRAIN
• OTHER STANDARD EQUIPMENT