623G ®

Wheel Tractor
Scraper

Engine
Tractor Engine Cat® C15 with ACERT ® technology
Net Power 246/272 kW 330/365 hp
Scraper Bowl
Heaped Capacity 17.5 m3 23 yd3
Rated Load 25 000 kg 55,115 lb
Weights
Total Operating – empty 37 435 kg 82,530 lb
 623G Wheel Tractor Scraper
Responsible, productive earthmoving machines, built to last.

Power Train – Engine Power Train – Transmission Electronic Controls

✔ Electronically controlled Caterpillar ✔ Planetary powershift transmission ✔ Electronic controls improve machine
®

engines with ACERT technology, delivers excellent load capability. response and provide advanced diagnostic
modular radiator with 9 fins per inch, Redesigned front and rear axles capabilities that result in better machine
and an Electronic Control Module accommodate wider brake shoes and availability. The Product Link option
maximizes power to the cutting edge drums. The neutral coast inhibitor and allows remote monitoring of location,
and exceptional haul road speed. programmable top gear reduce wear machine system status, and alert
pg. 4 while increasing machine performance. indicators. pg. 7
pg. 6

Elevator Mechanism Serviceability

The elevator mechanism conditions ✔ The latest electronic monitoring
material as it works, lifting material systems, grouped service points, and
off the cutting edge and carrying it to rugged Caterpillar components simplify
the top of the load for true self-loading maintenance and minimize downtime.
capability. The 623G is ideal for New two-piece access doors open easily
windrowing, blending material as and stay open for better access. pg. 13
well as breaking up vegetation in
stripping operations. pg. 12

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.

2
Operator Station Structures Scraper Bowl
Convenient control placement and a Superior structural design delivers ✔ Caterpillar Scraper bowls deliver large
comfortable work environment are keys state-of-the-art ride, capacity, and loads with better retention, excellent
to high productivity. Features include material control while assuring the material flow, fast cycle times and high
Single Lever Implement Control, durability and reliability customers productivity. Relocating the implement
an air seat suspension and improved expect from Caterpillar. pg. 10 valve to the draft tube improves access
instrumentation. pg. 8 and serviceability. pg. 11

Customer Support
The best parts availability and the best
service capability will help keep your
equipment working. pg. 14

✔ New Feature

3
Power Train – Engine
The new ACERT technology and proven components are electronically integrated to achieve
new levels of performance and efficiency.

Electronic Control Module (ECM). Maintenance. EUI engines have

The ECM responds to operator virtually no mechanically controlled
commands and engine sensor input parts to wear or adjust. These have
to optimize engine and machine been replaced by electronic controls,
performance. This advanced engine reducing maintenance costs and
management software controls and increasing machine availability.
protects the engine at all times against
Control Throttle Shifting (CTS).
cold starts, high altitude operations
Automatically synchronizes engine
and air filter plugging by monitoring:
speed to transmission speed when
• injection timing and pressure shifting gears. CTS reduces power train
stress and increases component life,
• engine cooling fan speed
as well as providing a smoother ride
• ether starting aid for the operator.

C15 Tractor Engine. The Cat C15 • hydraulic pumps Automatic Ether Injection. ECM activates
Electronically Controlled Unit Injection the ether injection system during engine
ADEM™. The ADEM controls engine
(EUI) diesel engine powers the tractor. cranking to help ensure reliable engine
speed by adjusting the fuel duration,
With dual horsepower capability, start-up in extreme cold operating
resulting in quicker starts in hot and
it provides high power and torque rise conditions.
cold weather, better fuel economy,
for excellent lugging in tough loading better operator response, and automatic Directional Shift Management.
conditions. The C15 is designed for compensation for altitude and filter During directional shifts or shifts
long hours of continuous operation with plugging. from neutral during high engine speed,
high displacement and low RPM ratings. engages speed clutches before directional
Air-to-Air Aftercooling (ATAAC).
Dual Horsepower. Electronic engines clutches to reduce power train energy
Reduces air inlet temperature for
deliver increased power when the auger and increase power train life.
enhanced combustion efficiency,
is engaged or when the machine is in reduced engine exhaust emissions Automatic Altitude Compensation.
the roading gears, providing quicker levels, higher altitude capability, The Electronic Control Module
acceleration on the haul road. and more power. automatically matches fuel delivery
ACERT Technology. The C15 electronic to barometric pressure. Auto deration
Greater Reliability. The EUI system has
engine with ACERT technology meets protects against excessive combustion
fewer moving parts than mechanical unit
US EPA Tier 3 and European Union temperatures that could result in
injection and requires few adjustments.
Stage III exhaust emission regulations. component damage.
ECM communicates with the monitoring
ACERT technology reduces emissions system (EMS) to warn the operator of Diagnostic Capability. Electronic
during the combustion process by using potential problems, reducing the potential Technician (Cat ET) is used to display
advanced technology in the air and fuel for major damage from occurring. real-time pressures, temperatures, fuel
systems, in conjunction with integrated settings and diagnostic messages as well
electronics. Caterpillar meets emission as historical information, such as engine
regulations at the combustion source over-speeds, overheating, low oil pressure
rather than recycling exhaust gases. and air filter restriction events.

4
Fuel Economy. Electronic controls yield Engine Speed Lock. Allows the
a fuel savings by optimizing the timing operator to maintain a given engine
setting for varying conditions. The ECM speed without using the accelerator
matches timing to the load on the engine, pedal. This eliminates operator fatigue
engine speed and temperature. associated with holding the pedal down
for extended periods of time. An on/off
Air Filter Restriction. The ECM
rocker switch enables the Speed Lock
monitors air filter restriction and sends
feature, and a dashboard lamp indicates
a warning message to the Electronic
the feature is active. Moving the rocker
Monitoring System III to alert the
switch to the off position, or activating
operator if the restriction exceeds the
the service brakes or the retarder,
allowable limit.
disables the feature.
Reduced Exhaust Smoke. The ECM
Automatic Belt Tensioning. Both the
determines the optimum fuel/air ratio,
tractor and scraper engines now have
then precisely controls fuel during
automatic belt tensioning rather than
cranking, starting and acceleration
manual tensioning. Other engine
to reduce smoke. This system is faster
improvements include:
and more efficient than mechanically
controlling the governor rack position. • reducing the number of belts
Electronic Unit Injection (EUI). (from five to two on the tractor,
Low Battery Elevated Idle. Electronic injection provides complete from four to two on the scraper)
ECM automatically compensates control over injection timing, duration,
for low alternator output at low idle rate and pressure under changing • eliminating the servicing for
by raising the rpm for brief intervals conditions over the entire engine fan drive bearings
to keep the batteries fully charged. 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

5
Power Train – Transmission
Integrated electronics allows the machine to monitor the power train which reduces stress
as well as provide a better ride to the operator.

Retarder. The hydraulic retarder acts

as an internal brake on the driveline that
minimizes the need to apply service
brakes. By engaging the retarder 3 to
4 seconds before the machine traverses
a downhill grade, the operator can reduce
wear on the service brakes and enhance
machine control.
Differential Control. Electronic differential
lock on the tractor helps prevent the
drive wheels from spinning in poor
underfoot conditions. The operator
engages the differential lock by choosing
either the right or left foot control
located on the floor of the cab.
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.
Independent Systems. Expanding shoe-
type brakes are a cam-operated design
Transmission. Electronically controlled Neutral Coast Inhibitor. Neutral coast that is air-applied and spring released.
Caterpillar planetary powershift inhibitor prevents the transmission The braking system uses independent
transmission with eight forward and from shifting into neutral if the operator front and rear circuits with secondary
one reverse speed. Tractor gears 1 & 2 selects neutral while moving, as well brakes automatically applied if the service
operate in converter drive for increased as maintaining the flow of the air pressure drops to 380 kPa (55 psi).
torque capability during cut and fill transmission fluid.
Parking Brakes. The push-button operated
operations. Gears 3-8 operate in direct-
Transmission Hold. Allows the operator parking brake features a spring-applied,
drive for drive train efficiency during
to maintain converter drive for increased air-released mechanism that operates
the haul. Reverse gear operates in
rimpull, or hold the current gear for the service brakes. All brakes meet the
converter drive.
enhanced control. ISO 3450: 1998 standard.
Planetary Design. Provides larger
Programmable Top Gear Selection. Final Drives. Outboard-mounted,
contact area between gears than
Allows the operator to manually set the planetary design final drives reduce
countershaft transmissions for
top gear (3rd – 8th) available to match torque loads on the other power train
greater load-carrying capacity.
conditions or to match the hauling speed components. Large-capacity, double-
of the fleet to specific job-site needs. row roller bearings and Caterpillar
Duo-Cone® seals deliver exceptional
reliability in the toughest applications.

6
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.
Air Filter Restrictor Indicator.
Electronic control module monitors air
filter restriction and sends a warning
message to the electronic monitoring
system to alert the operator if the
restriction exceeds the allowable limit.
Automatic Ether Injection. The ECM
activates the ether injection system
during engine cranking to enhance
cold weather starting.
Automatic Altitude Compensation.
At high altitudes the system automatically
de-rates fuel delivery as a function
of barometric pressure sensed by the
system’s atmospheric pressure sensor.
Low Battery Elevated Idle. The ECM
automatically compensates for low Greater Reliability. The Caterpillar EUI Product Link Ready. Product Link is a
alternator output at low idle to keep system has fewer moving parts than wireless system that allows the customer
the batteries fully charged. mechanical unit injection and requires to track machine data such as location,
few adjustments. ECM communicates service meter hours as well as machine
Improved Serviceability. Combined with the monitoring system (EMS) to health information. The system has the
monitoring systems, easy access warn the operator when problems arise, capability to automatically issue alerts
diagnostics and more durable components reducing the potential for major damage when the machine is being operated
make routine maintenance and servicing from occurring. beyond owner defined time and
simple and fast. location limits.
Maintenance. EUI engines have
Easy Access Diagnostics. Diagnostic virtually no mechanically controlled Reduced Exhaust Smoke. The ECM
codes are accessible through the EMS parts to wear or adjust. These have been reads electronic sensors to determine
main display module, via the Electronic replaced by electronic controls, reducing the optimum fuel/air ratio, then precisely
Technician (Cat ET). This offers a head maintenance costs and increasing controls fuel during cranking, starting
start on problem solving, with a radio machine availability. and acceleration to reduce smoke.
call often providing the service technician The ECM system is faster and more
with the knowledge of which tools, Fuel Economy. Electronic controls yield
efficient than mechanically controlling
troubleshooting guides, and possibly a fuel savings by optimizing the timing
the governor rack position.
even replacement parts to bring to setting for varying conditions. The ECM
the machine. matches timing to the load on the engine,
engine speed and temperature.

7
Operator Station
Redesigned for enhanced operator comfort and productivity.

Multi-Adjustable Seat. The Cat Comfort Seat Suspension. The seat suspension Standard Air Conditioning. Gives the
Cloth Seat has an adjustable seat and redefines the ride of scrapers. It features operator a comfortable workstation in
armrests for maximum operator comfort. a high performance air shock absorber various types of weather. Relocated
with its own air compressor. ventilation louvers improve airflow
• Swivels and locks in four positions
to the operator.
(0°, 10°, 20° and 30°) providing the Revised Steering Column. Increases
optimum operating position in the legroom a full 3.5 inches (89 mm), Storage And Amenities. Convenient
cut or on the haul. and reduces knee contact points. storage location includes space for a
lunch box and first aid kit. The cab also
• Fore/aft and vertical height
has a cup holder as well as an ashtray.
adjustment to accommodate
various sized operators.

8
Visibility. Hood and front shroud
width increased to accommodate the
low emission engine, the air-to-air 1 (Down)
aftercooler (ATAAC), ether starting aid, 4
and lights. Hood corners are sloped to
maintain the excellent visibility. 5
Single Lever Implement Control.
Simple and easy to operate, the joystick 3 2 (Forward) 2 (Return)
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) 1 (Up)

2) Ejector (side to side)

3) Thumb rocker switch
• Apron position
• Elevator direction, speed Instrument Display Panel. Features a Engine Speed Lock Controller.
4) Transmission Hold quad-gauge layout showing engine Enhances operation during long haul
coolant temp, transmission/torque cycles by allowing the operator to
5) Cushion Hitch converter oil temp, fuel level, and maintain a desired engine speed without
6) Trigger* (not shown here – system air pressure. maintaining pressure on the accelerator.
is on front of joystick) Logical Control Placement. Simplified Transmission Control.
• Auger (on/off) Frequently used switches and indicator Simplifies gear selection (1st, 2nd,
lights are on the instrument panel, and Drive and Reverse) and allows
• Push-Pull (bail up/down) less frequently used switches on the operator-defined top gear control.
• Elevator (on/off, resume) overhead console. Relocating the gear control to the
rear increases operator legroom.
* Standard open bowl does not have
a trigger

9
Structures
Superior structural design and construction optimize performance and reliability.

1 Load cylinder Cushion Hitch. The electronically

2 Hitch castings actuated cushion hitch incorporates
3 Scraper gooseneck a parallelogram-type linkage for
4 Nitrogen accumulators exceptional strength with nitrogen
5 Orifice accumulators to deliver a smooth ride
6 Oil from tractor hydraulic system for enhanced operator comfort.
7 Leveling valve • controlled oil flow dampens rebound
8 Free floating pistons oscillation
• leveling valve automatically centers
piston in cylinder for all loads
• steel castings are used extensively
to eliminate many welded joints and
increase strength
3
• double-kingbolt design withstands
high external forces and simplifies
2 4 installation and removal
Nitrogen Accumulators. Vertically
4 mounted hydraulic cylinder transfers
1 road shocks to nitrogen accumulators.
5 Nitrogen accumulators absorb and
8
dampen road shocks, thus reducing
7 the loads from being transmitted to
8 the operator.
6 Lockout Switch. An operator-selectable
lockout switch, located on the joystick,
locks the cushion hitch for improved
control of the cutting edge during
loading and dumping.

10
Scraper Bowl
Designed for optimum loading, material retention and ejection.

Redesigned Bowl. Excellent productivity Cutting Edges. May be adjusted according Material Application. The 623G is ideal
with a 10% increase in bowl capacity to job conditions. For most efficient for windrowing, blending material as
from the F series, improved draft arm loading, use the thinnest edge that well as breaking up vegetation in
protection, and better load retention. provides satisfactory wear life and stripping operations.
Low-profile design of the bowl offers impact resistance.
less resistance to incoming materials,
Caterpillar Ground Engaging Tools
while cellular construction adds
(G.E.T.). A wide variety of Ground
strength and dent resistance to bowl
Engaging Tool (GET) options, such as
sides and floor.
standard, serrated, and abrasion resistant
Bulldozer Ejection System. material (ARM), are available to optimize
Combines constant spreading control scraper loading in various materials.
while minimizing carryback material. Most are reversible to provide long life
The floor of the bowl retracts as the and reduced operating costs. Contact
ejector moves forward, allowing the your Cat Dealer to learn more about
operator to precisely control the flow the best tools for your applications.
of material.

11
Elevator Mechanism
Self-loading capability, versatility and excellent material handling characteristics.

Versatility. The 623G is ideal for Throat Opening. Adjustable up to Implement Pumps. High-pressure,
windrowing, blending material as well 610 mm (24"), enables faster loading engine-driven implement pumps enable
as breaking up vegetation in stripping and greater material control. the operator to take deeper cuts and
operations. load in a shorter distance with less
Low-Maintenance Rollers. Carrier rollers
elevator stall.
Material Handling. The elevator lifts and chain idlers are heat-treated for
material off of the cutting edge and wear resistance. Fixed elevator rollers Elevator Controls. The operator has
carries it to the top of the elevator and require no adjustment, reducing variable control of the elevator to match
then dumps the material into the bowl. maintenance. Sealed and lubricated the speed of the elevator to the material
Blending the material helps eliminate floor rollers are maintenance free. conditions for increased productivity.
voids in the bowl for consistent payloads The direct acting floor mechanism
Reversible. The elevator reverses
and even unloading. eliminates the drag link.
for spreading topsoil, unloading
Drive Sprockets. Split, bolt-on drive Two-stage Ejection System. Allows the cohesive material, and blending
sprockets eliminate the need to remove floor to slide backward while a dozer-type windrowed material.
the chain during servicing and require ejector moves forward (toward the
Single-pivot Design. The single-pivot
no lubrication. Hydraulically adjustable cutting edge), cleaning the entire bowl
elevator design improves the load
chains have exceptional pull strength for in one motion.
profile which allows the machine
dependable performance and long life.
to achieve consistent payloads.
Chain Adjustment. Maximize chain life
quickly and easily with just a grease gun.

12
Serviceability
Count on Caterpillar for simplified service and the most productive uptime.

Event Log. The EMS event log records Access Doors. The tractor has a standard
problems detected by the control two-piece door on the right side for
system, including the time an event better access to service points. The hood,
occurs, the number of occurrences hinged on the front and supported by
for the event, an event identifier and spring struts, easily opens towards the
problem code. The event log can front of the machine, for better access
be accessed using the Electronic to the top of the engine.
Technician (Cat ET).
Electronic Technician (Cat ET).
Implement Valve Relocation. The Caterpillar Electronic Technician
The implement valve has been relocated (Cat ET) Service Tool is useful in
from the tractor to the top of scraper troubleshooting existing problems
draft tube, reducing the number of hoses or identifying potential problems
and tubes that cross over the gooseneck. by displaying:
The move reduces potential leak points,
Grouped Service Points. Maintenance • Real-time pressures, temperatures,
and improves service access.
and service points for the engine are fuel settings and diagnostic
grouped on the right-hand side for One Piece Power Block. Jumpstart messages
easy access. They include the engine receptacle and disconnect switch
• Historical data such as engine over-
air cleaner, engine oil check and fill, are integrated into a one-piece power
speeds, overheating, low oil pressure
fuel filters and priming, coolant level block for better electrical integrity and
and air filter restriction events
sight glass, window washer bottle, serviceability. The disconnect switch,
air conditioning dryer cartridge, ether with a lockable cover, disables all power • More detailed information to the
starting aid canister, engine oil filter, from the batteries and jumpstart functions. service technician who can access
fan drive lubrication, and sampling ET via a laptop computer
Electro-Hydraulic Implement Control.
ports for the engine oil and coolant. Simplifies serviceability by removing Easy Access Diagnostics. Diagnostic
• Spin-on fluid filters for all but the the cab pilot valve and associated lines, codes are accessible through the EMS
main hydraulic filter which also improves reliability and main display module, via the Cat ET.
reduces noise. The high efficiency Relaying this information to the service
• Cab wiring harness redesigned and electro-hydraulic pilot oil filter provides technician can let him know which tools,
relocated for better serviceability cleaner oil for the pilot system. troubleshooting guides, and possibly
Electronic Monitoring System (EMS III). even replacement parts to bring to
Scraper Electrical Harness. A ribbon
Monitors machine status and provides the machine.
wiring harness replaced the cable
real-time information to the operator harness for improved wear and durability. SAFETY.CAT.COM™.
including warnings of problems identified Its increased flexibility oscillates with the
by the Electronic Control Modules. machine, and polyurethane boots offer
better protection against the elements.

13
Customer Support
Cat dealer services help you operate longer with lower costs.

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
customer’s 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
S•O•SSM Analysis and Coolant Sampling
Product Support. You will find nearly Machine Selection. Make detailed and Technical Analysis help avoid
all parts at our dealer parts counter. comparisons of the machines under unscheduled repairs.
Cat dealers use a world-wide computer consideration before purchase.
network to find in-stock parts to minimize Cat dealers can estimate component Replacement. Repair, rebuild or replace?
machine down time. Save money with life, preventive maintenance cost, Your Cat dealer can help you evaluate
genuine Cat Reman parts. You receive and the true cost of lost production. the cost involved so you can make the
the same warranty and reliability as new right choice.
Purchase. Look past initial price.
products at substantial cost savings.
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.

14
Engine Scraper Bowl

Tractor Engine Cat C15 with Heaped Capacity 17.5 m3 23 yd3

ACERT technology Rated Load 25 000 kg 55,115 lb
Net Power – Gears 1-2 246 kW 330 hp Struck Capacity 13.8 m3 18 yd3
Net Power – Gears 3-8 272 kW 365 hp Depth of Cut – Max 330 mm 13 in
Gross Power – Gears 1-2 268 kW 359 hp Width of Cut, to Router Bits 3505 mm 138 in
Gross Power – Gears 3-8 294 kW 394 hp Ground Clearance – Max 387 mm 15.2 in
Bore 140 mm 5.5 in Cutting Edge Thickness 29 mm 1.14 in
Stroke 165 mm 6.5 in Hydraulic Penetration Force 150 kN 33,750 lb
Displacement 15.2 L 928 in3 Depth of Spread – Max 380 mm 15 in
Flywheel Power 246 kW 330 hp
• Net power advertised is the power available at rated speed
of 1,800 rpm, measured at the flywheel when the engine is Elevator
equipped with fan, air cleaner, muffler and alternator.
Length – Overall 3730 mm 146.9 in
Width of Flight Face 217 mm 8.5 in
Transmission Length of Flights 2260 mm 89 in
Spacing of Flights 510 mm 20 in
1 Forward 5 kph 3.1 mph Number of Flights 15
2 Forward 7.6 kph 4.7 mph
3 Forward 10.9 kph 6.8 mph
4 Forward 14.8 kph 9.2 mph Steering
5 Forward 19.9 kph 12.4 mph
6 Forward 26.9 kph 16.7 mph Width – 180° Turn 10.9 m 35.9 ft
7 Forward 36.4 kph 22.6 mph Steering Angle – Right 90°
8 Forward 51.5 kph 32 mph Steering Angle – Left 85°
Reverse 9.2 kph 5.7 mph Hydraulic Output 209 L/min 55 gal/min
• Optional supplemental steering system meets SAE J1511
(OCT 90) and ISO 5010 (1992) requirements.
Hydraulics

Bowl Cylinder Bore 152 mm 6 in Service Refill Capacities

Bowl Cylinder Stroke 508 mm 20 in
Floor Cylinder Bore 152 mm 6 in Fuel Tank 606 L 160 gal
Floor Cylinder Stroke 1353 mm 53.25 in Crankcase 36 L 9.5 gal
Ejector Cylinder Bore 127 mm 5 in Transmission 72 L 19 gal
Ejector Cylinder Stroke 1220 mm 48 in Differential 144 L 38 gal
Steering Circuit 209 L/min 55 gal/min Final Drive (each side) 19 L 5 gal
Scraper Circuit 241 L/min 63.7 gal/min Wheel Coolant (each) 45 L 12 gal
Cushion Hitch Circuit 37 L/min 9.8 gal/min Cooling System 107 L 28 gal
Supplemental Steering Circuit 150 L/min 39.9 gal/min Hydraulic Reservoir 140 L 37 gal
Relief Valve – Steering Circuit 15 500 kPa 2,250 psi
Relief Valve – Implement Circuit 17 300 kPa 2,510 psi
Compensator Settings – 16 000 kPa 2,175 psi
Cushion Hitch Circuit
Compensator Settings – 36 175 kPa 5,246 psi
Elevator Circuit
• Steering circuit at 1,900 rpm.

623G Wheel Tractor Scraper specifications 15

Weights Standards

Total Operating – Empty 37 435 kg 82,530 lb • Rollover Protective Structure (ROPS) meets SAE J320a,
Front Axle 23 958 kg 52,819 lb SAE J1040 MAY 94, ISO 3471-1986 and ISO 3471-1994
Rear Axle 13 477 kg 29,711 lb • Falling Object Protective Structure (FOPS) meets SAE J231
Total Shipping 36 830 kg 81,196 lb JAN 81 and ISO 3449-1992
Tractor Shipping 23 940 kg 52,778 lb • The operator sound exposure Leq (equivalent sound
Scraper Shipping 12 891 kg 28,419 lb pressure level) measured according to the work cycle
Total Operating – Loaded 62 435 kg 137,646 lb procedures specified in ANSI/SAE J1166 OCT98 is 81 dB(A),
Front Axle Weight – Loaded 31 218 kg 68,823 lb for cab offered by Caterpillar, when properly installed and
maintained and tested with the doors and windows closed.
Rear Axle Weight – Loaded 31 218 kg 68,823 lb
• Hearing protection may be needed when operating with
an open operator station and cab (when not properly
maintained or doors/windows open) for extended periods
or in noisy environments.

Dimensions
All dimensions are approximate.

1 5 6
4 10
2 3 7

8 11
9 12 14
623G 13

1 Width – Overall Machine 3556 mm 140 in 8 Ground Clearance, Tractor 553 mm 21.8 in
2 Width – Tractor 3130 mm 123.2 in 9 Front of Tractor to Front Axle 3058 mm 120.4 in
3 Width – Rear Tire Center Lines 2180 mm 85.8 in 10 Rim Radius 432 mm 17 in
4 Width – Inside of bowl 2946 mm 116 in 11 Height – Scraper Blade Max. 380 mm 15 in
5 Width – Outside Rear Tires 3048 mm 120 in 12 Wheelbase 7976 mm 314 in
6 Height – Overall Shipping 3708 mm 146 in 13 Length – Overall Machine 13 209 mm 520 in
7 Height – Top of Cab 3423 mm 134.8 in 14 Rear Axle to Rear of Machine 2176 mm 85.7 in

16 623G Wheel Tractor Scraper specifications

Gradeability/Speed/Rimpull Retarding

To determine gradeability performance: Read from gross To determine retarding performance: Read from gross weight
weight down to the percent of total resistance. Total resistance down to the percent effective grade. (Effective grade equals
equals actual percent grade plus 1% for each 9 kg/t (20 lb/ton) actual percent grade minus 1% for each 9 kg/t (20 lb/ton) of
of rolling resistance. From this weight-resistance point, read rolling resistance). From this weight-effective grade point,
horizontally to the curve with the highest obtainable gear, then read horizontally to the curve with the highest obtainable
down to maximum speed. Usable rimpull will depend upon speed range, then down to maximum descent speed the
traction available and weight on drive wheels. retarder can properly handle.

623G Tier 3 — Rimpull 623G Tier 3 — Retarding*

Standard Arrangement* Gross Weight
Gross Weight 0 20 40 60 80 100 120 140 160 180 lb x 1000

0 20 40 60 80 100 120 140 lb x 1000

lb x kg x
1000 1000 0 10 20 30 40 50 60 70 80 kg x 1000
0 10 20 30 40 50 60 70 kg x 1000
40 E L
E L 30%

(Grade minus Rolling Resistance)

80 25%

(Grade plus Rolling Resistance)

20%

3rd Gear
30

Effective Grade
1st Gear
60
Total Resistance 15%

4th Gear
Rimpull

20
30% 5th Gear 10%
40

25% 6th Gear

2nd Gear
20% 7th Gear
5%
3rd Gear 8th Gear
10 15%
20 4th Gear
5th Gear 10%
6th Gear
Torque
7th Gear 8th Gear 5%
Converter Drive
Direct Drive 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h
0 0
0 10 20 30 40 50 60 km/h 0 5 10 15 20 25 30 35 40 mph
0 5 10 15 20 25 30 35 mph
3—3rd Gear Direct Drive
Speed
Speed 4—4th Gear Direct Drive
1—1st Gear Torque Converter Drive
5—5th Gear Direct Drive
2—2nd Gear Direct Drive E—Empty 36 830 kg (81,196 lb)
6—6th Gear Direct Drive
3—3rd Gear Direct Drive E—Empty 36 830 kg (81,196 lb) L—Loaded 62 135 kg (137,646 lb)
7—7th Gear Direct Drive
4—4th Gear Direct Drive
L—Loaded 62 135 kg (137,646 lb) 8—8th Gear Direct Drive
5—5th Gear Direct Drive
6—6th Gear Direct Drive
* at sea level
7—7th Gear Direct Drive
8—8th Gear Direct Drive

* at sea level

623G Wheel Tractor Scraper specifications 17

Standard Equipment
Standard equipment may vary. Consult your Caterpillar dealer for details.

ELECTRICAL POWER TRAIN

Alarm, backup Engine
Alternator, 75 amp Electronic Unit Injection (EUI)
Batteries (4), 12V Maintenance Free, High Output Electric Start, 24V
Electrical System, 24V Fan, suction
Lighting System Ground Level Engine Shutdown
Directional Signals Muffler
Hazard Lights Starting Aid, ether
Headlights, halogen with dimmer Thermo-shield, laminated
Floodlight, cutting edge Cat C15, 6-cylinder Diesel with ACERT technology
Lighting System – Scraper Air Cleaner, dry-type with pre-cleaner
Directional Signals Radiator, NGMR (9 fins per inch)
Hazard Lights Guard, crankcase
Stop/Tail Braking System
Starting Receptacle Parking/Primary/Secondary
Shields – brake
OPERATOR ENVIRONMENT Transmission
Air Conditioner (includes heater and defroster) 8-speed Automatic Powershift with Electronic Control
Cigarette Lighter and Ashtray Control Throttle Shifting
Coat Hook Differential – lockup
Diagnostic Connection Port (12V) Downshift Inhibitor
Dome Courtesy Light Neutral Coast Inhibitor
Gauge Group Programmable Top-gear Selection
Air Pressure
Converter/Retarder Temperature OTHER STANDARD EQUIPMENT
Electronic Monitoring System (EMS III) Air Dryer
Engine Coolant Temperature Cushion Hitch
Actual Transmission Gear Indicator Extended Life Coolant, –36° C (–33° F)
Fuel Fast Oil Change
Speedometer Fenders
Tachometer Locks, vandalism protection
Transmission Gear Indicator Product Link ready
Horn Rims – 29 in (736.6 mm)
Implement Control Joystick Tires, 33.25-R29 radial
Rearview Mirrors Tow Pins – front and rear
Radio Ready (two radio openings, speakers,
and 5-amp converter)
ROPS Cab with Sound Suppression and Pressurization
Static Seatbelt
Seat, Air Suspension, Caterpillar Comfort, cloth
Steering Wheel – tilt and telescoping
Storage Compartment
Engine Speed Control Lock
Transmission Hold
Windows – sliding side, swing out
Windshield – laminated glass
Windshield Wiper/Washer – front and rear

18 623G Wheel Tractor Scraper specifications

Optional Equipment
Optional equipment may vary. Consult your Caterpillar dealer for details.

kg lb kg lb
Fenders, scraper 121 266 Retarder, hydraulic 150 330
Fuel System, fast-fill 10 23 Ripper Teeth 290 640
Heater, engine coolant 2 4 Steering, secondary 50 110
Lights, side vision 5 10

623G Wheel Tractor Scraper specifications 19

623G Wheel Tractor Scraper

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and industry solutions, visit us on the web at www.cat.com

© 2007 Caterpillar
All Rights Reserved
Printed in U.S.A.

Materials and specifications are subject to change without notice.

Featured machines in photos may include additional equipment.
See your Caterpillar dealer for available options.

AEHQ5614-01 (8-07) CAT, CATERPILLAR, ACERT, SAFETY.CAT.COM, their respective logos, “Caterpillar Yellow”
and the POWER EDGE trade dress, as well as corporate and product identity used
Replaces AEHQ5614 (12-04) herein, are trademarks of Caterpillar and may not be used without permission.