Caterpillar 623G BROCHURE

Engine

Tractor Engine Cat®C15 with ACERT®technology
Net Power 246/272 kW 330/365 hp

Scraper Bowl

Heaped Capacity 17.5 m

3

23 yd

3

Rated Load 25 000 kg 55,115 lb

Weights

Total Operating – empty 37 435 kg 82,530 lb

623G

Wheel Tractor Scraper

®

®

2

623G Wheel Tractor Scraper

Responsible, productive earthmoving machines, built to last.

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.

Serviceability

The latest electronic monitoring
systems, grouped service points, and
rugged Caterpillar components simplify
maintenance and minimize downtime.
New two-piece access doors open easily
and stay open for better access. pg. 13

✔

Elevator Mechanism

The elevator mechanism conditions
material as it works, lifting material
off the cutting edge and carrying it to
the top of the load for true self-loading
capability. The 623G is ideal for
windrowing, blending material as
well as breaking up vegetation in
stripping operations. pg. 12

Electronic Controls

Electronic controls improve machine
response and provide advanced diagnostic
capabilities that result in better machine
availability. The Product Link option
allows remote monitoring of location,
machine system status, and alert
indicators. pg. 7

✔

Power Train – Transmission

Planetary powershift transmission
delivers excellent load capability.
Redesigned front and rear axles
accommodate wider brake shoes and
drums. The neutral coast inhibitor and
programmable top gear reduce wear
while increasing machine performance.

pg. 6

✔

Power Train – Engine

Electronically controlled Caterpillar

®

engines with ACERT technology,
modular radiator with 9 fins per inch,
and an Electronic Control Module
maximizes power to the cutting edge
and exceptional haul road speed.

pg. 4

✔

✔ New Feature

3

Customer Support

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

Scraper Bowl

Caterpillar Scraper bowls deliver large
loads with better retention, excellent
material flow, fast cycle times and high
productivity. Relocating the implement
valve to the draft tube improves access
and serviceability. pg. 11

✔

Structures

Superior structural design delivers
state-of-the-art ride, capacity, and
material control while assuring the
durability and reliability customers
expect from Caterpillar. pg. 10

Operator Station

Convenient control placement and a
comfortable work environment are keys
to high productivity. Features include
Single Lever Implement Control,
an air seat suspension and improved
instrumentation. pg. 8

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

ADEM™. The ADEM controls engine
speed by adjusting the fuel duration,
resulting in quicker starts in hot and
cold weather, better fuel economy,
better operator response, and automatic
compensation for altitude and filter
plugging.

Air-to-Air Aftercooling (ATAAC).

Reduces air inlet temperature for
enhanced combustion efficiency,
reduced engine exhaust emissions
levels, higher altitude capability,
and more power.

Greater Reliability. The EUI system has
fewer moving parts than mechanical unit
injection and requires few adjustments.
ECM communicates with the monitoring
system (EMS) to warn the operator of
potential problems, reducing the potential
for major damage from occurring.

Maintenance. EUI engines have
virtually no mechanically controlled
parts to wear or adjust. These have
been replaced by electronic controls,
reducing maintenance costs and
increasing machine availability.

Control Throttle Shifting (CTS).

Automatically synchronizes engine
speed to transmission speed when
shifting gears. CTS reduces power train
stress and increases component life,
as well as providing a smoother ride
for the operator.

Automatic Ether Injection. ECM activates
the ether injection system during engine
cranking to help ensure reliable engine
start-up in extreme cold operating
conditions.

Directional Shift Management.

During directional shifts or shifts
from neutral during high engine speed,
engages speed clutches before directional
clutches to reduce power train energy
and increase power train life.

Automatic Altitude Compensation.

The Electronic Control Module
automatically matches fuel delivery
to barometric pressure. Auto deration
protects against excessive combustion
temperatures that could result in
component damage.

Diagnostic Capability. Electronic
Technician (Cat ET) is used to display
real-time pressures, temperatures, fuel
settings and diagnostic messages as well
as historical information, such as engine
over-speeds, overheating, low oil pressure
and air filter restriction events.

4

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

Power Train – Engine

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.

Air Filter Restriction. The ECM
monitors air filter restriction and sends
a warning message to the Electronic
Monitoring System III to alert the
operator if the restriction exceeds the
allowable limit.

Reduced Exhaust Smoke. The ECM
determines the optimum fuel/air ratio,
then precisely controls fuel during
cranking, starting and acceleration
to reduce smoke. This system is faster
and more efficient than mechanically
controlling the governor rack position.

Low Battery Elevated Idle.

ECM automatically compensates
for low alternator output at low idle
by raising the rpm for brief intervals
to keep the batteries fully charged.

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

5

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 direct­drive for drive train efficiency during
the haul. Reverse gear operates in
converter drive.

Planetary Design. Provides larger
contact area between gears than
countershaft transmissions for
greater load-carrying capacity.

Neutral Coast Inhibitor. Neutral coast
inhibitor prevents the transmission
from shifting into neutral if the operator
selects neutral while moving, as well
as maintaining the flow of the
transmission fluid.

Transmission Hold. Allows the operator
to maintain converter drive for increased
rimpull, or hold the current gear for
enhanced control.

Programmable Top Gear Selection.

Allows the operator to manually set the
top gear (3rd – 8th) available to match
conditions or to match the hauling speed
of the fleet to specific job-site needs.

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 shoe­type brakes are a cam-operated design
that is air-applied and spring released.
The braking system uses independent
front and rear circuits with secondary
brakes automatically applied if the service
air pressure drops to 380 kPa (55 psi).

Parking Brakes. The push-button operated
parking brake features a spring-applied,
air-released mechanism that operates
the service brakes. All brakes meet the
ISO 3450: 1998 standard.

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

6

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.

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
alternator output at low idle to keep
the batteries fully charged.

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

Easy Access Diagnostics. Diagnostic
codes are accessible through the EMS
main display module, via the Electronic
Technician (Cat ET). This offers a head
start on problem solving, with a radio
call often providing the service technician
with the knowledge of which tools,
troubleshooting guides, and possibly
even replacement parts to bring to
the machine.

Greater Reliability. The Caterpillar EUI
system has fewer moving parts than
mechanical unit injection and requires
few adjustments. ECM communicates
with the monitoring system (EMS) to
warn the operator when problems arise,
reducing the potential for major damage
from occurring.

Maintenance. EUI engines have
virtually no mechanically controlled
parts to wear or adjust. These have been
replaced by electronic controls, reducing
maintenance costs and increasing
machine availability.

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.

7

Electronic Controls

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

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

• Swivels and locks in four positions
(0°, 10°, 20° and 30°) providing the
optimum operating position in the
cut or on the haul.

• Fore/aft and vertical height
adjustment to accommodate
various sized operators.

Seat Suspension. The seat suspension
redefines the ride of scrapers. It features
a high performance air shock absorber
with its own air compressor.

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.

8

Redesigned for enhanced operator comfort and productivity.

Operator Station

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)

• Push-Pull (bail up/down)

• Elevator (on/off, resume)

* Standard open bowl does not have

a trigger

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

Logical Control Placement.

Frequently used switches and indicator
lights are on the instrument panel, and
less frequently used switches on the
overhead console.

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.

9

1

(Down)

4

5

3

2 (Forward) 2 (Return)

1 (Up)

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

Nitrogen Accumulators. Vertically
mounted hydraulic cylinder transfers
road shocks to nitrogen accumulators.
Nitrogen accumulators absorb and
dampen road shocks, thus reducing
the loads from being transmitted to
the operator.

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

Structures

Superior structural design and construction optimize performance and reliability.

1 Load cylinder
2 Hitch castings
3 Scraper gooseneck
4 Nitrogen accumulators
5 Orifice
6 Oil from tractor hydraulic system
7 Leveling valve
8 Free floating pistons

2

1

5

3

4

4

8

7

8

6

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.

11

Scraper Bowl

Designed for optimum loading, material retention and ejection.

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.

Reversible. The elevator reverses
for spreading topsoil, unloading
cohesive material, and blending
windrowed material.

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.

12

Elevator Mechanism

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

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.

Event Log. The EMS event log records
problems detected by the control
system, including the time an event
occurs, the number of occurrences
for the event, an event identifier and
problem code. The event log can
be accessed using the Electronic
Technician (Cat ET).

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 over­speeds, 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.

SAFETY.CAT.COM™.

13

Serviceability

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

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
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•SSMAnalysis 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.

14

Customer Support

Cat dealer services help you operate longer with lower costs.

15

623G Wheel Tractor Scraper specifications

Scraper Bowl

Heaped Capacity 17.5 m

3

23 yd

3

Rated Load 25 000 kg 55,115 lb
Struck Capacity 13.8 m

3

18 yd

3

Depth of Cut – Max 330 mm 13 in
Width of Cut, to Router Bits 3505 mm 138 in
Ground Clearance – Max 387 mm 15.2 in
Cutting Edge Thickness 29 mm 1.14 in
Hydraulic Penetration Force 150 kN 33,750 lb
Depth of Spread – Max 380 mm 15 in

Elevator

Length – Overall 3730 mm 146.9 in
Width of Flight Face 217 mm 8.5 in
Length of Flights 2260 mm 89 in
Spacing of Flights 510 mm 20 in
Number of Flights 15

Steering

Width – 180° Turn 10.9 m 35.9 ft
Steering Angle – Right 90°
Steering Angle – Left 85°
Hydraulic Output 209 L/min 55 gal/min

• Optional supplemental steering system meets SAE J1511
(OCT 90) and ISO 5010 (1992) requirements.

Service Refill Capacities

Fuel Tank 606 L 160 gal
Crankcase 36 L 9.5 gal
Transmission 72 L 19 gal
Differential 144 L 38 gal
Final Drive (each side) 19 L 5 gal
Wheel Coolant (each) 45 L 12 gal
Cooling System 107 L 28 gal
Hydraulic Reservoir 140 L 37 gal

Engine

Tractor Engine Cat C15 with

ACERT technology
Net Power – Gears 1-2 246 kW 330 hp
Net Power – Gears 3-8 272 kW 365 hp
Gross Power – Gears 1-2 268 kW 359 hp
Gross Power – Gears 3-8 294 kW 394 hp
Bore 140 mm 5.5 in
Stroke 165 mm 6.5 in
Displacement 15.2 L 928 in

3

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
equipped with fan, air cleaner, muffler and alternator.

Transmission

1 Forward 5 kph 3.1 mph
2 Forward 7.6 kph 4.7 mph
3 Forward 10.9 kph 6.8 mph
4 Forward 14.8 kph 9.2 mph
5 Forward 19.9 kph 12.4 mph
6 Forward 26.9 kph 16.7 mph
7 Forward 36.4 kph 22.6 mph
8 Forward 51.5 kph 32 mph
Reverse 9.2 kph 5.7 mph

Hydraulics

Bowl Cylinder Bore 152 mm 6 in
Bowl Cylinder Stroke 508 mm 20 in
Floor Cylinder Bore 152 mm 6 in
Floor Cylinder Stroke 1353 mm 53.25 in
Ejector Cylinder Bore 127 mm 5 in
Ejector Cylinder Stroke 1220 mm 48 in
Steering Circuit 209 L/min 55 gal/min
Scraper Circuit 241 L/min 63.7 gal/min
Cushion Hitch Circuit 37 L/min 9.8 gal/min
Supplemental Steering Circuit 150 L/min 39.9 gal/min
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.

Dimensions

All dimensions are approximate.

1 Width – Overall Machine 3556 mm 140 in
2 Width – Tractor 3130 mm 123.2 in
3 Width – Rear Tire Center Lines 2180 mm 85.8 in
4 Width – Inside of bowl 2946 mm 116 in
5 Width – Outside Rear Tires 3048 mm 120 in
6 Height – Overall Shipping 3708 mm 146 in
7 Height – Top of Cab 3423 mm 134.8 in

8 Ground Clearance, Tractor 553 mm 21.8 in
9 Front of Tractor to Front Axle 3058 mm 120.4 in
10 Rim Radius 432 mm 17 in
11 Height – Scraper Blade Max. 380 mm 15 in
12 Wheelbase 7976 mm 314 in
13 Length – Overall Machine 13 209 mm 520 in
14 Rear Axle to Rear of Machine 2176 mm 85.7 in

16

623G Wheel Tractor Scraper specifications

Standards

• Rollover Protective Structure (ROPS) meets SAE J320a,
SAE J1040 MAY 94, ISO 3471-1986 and ISO 3471-1994

• Falling Object Protective Structure (FOPS) meets SAE J231
JAN 81 and ISO 3449-1992

• The operator sound exposure Leq (equivalent sound
pressure level) measured according to the work cycle
procedures specified in ANSI/SAE J1166 OCT98 is 81 dB(A),
for cab offered by Caterpillar, when properly installed and
maintained and tested with the doors and windows closed.

• 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.

Weights

Total Operating – Empty 37 435 kg 82,530 lb
Front Axle 23 958 kg 52,819 lb
Rear Axle 13 477 kg 29,711 lb
Total Shipping 36 830 kg 81,196 lb
Tractor Shipping 23 940 kg 52,778 lb
Scraper Shipping 12 891 kg 28,419 lb
Total Operating – Loaded 62 435 kg 137,646 lb
Front Axle Weight – Loaded 31 218 kg 68,823 lb
Rear Axle Weight – Loaded 31 218 kg 68,823 lb

1

2

3

623G

5

4

6

7

8

9

10

11

13

12

14

17

623G Wheel Tractor Scraper specifications

Gradeability/Speed/Rimpull

Retarding

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

623G Tier 3 — Rimpull

Standard Arrangement*

Gross Weight

30%

25%

20%

15%

10%

lb x 1000

kg x 1000

Total Resistance

5%

km/h

mph

lb x
1000

Rimpull

1—1st Gear Torque Converter Drive
2—2nd Gear Direct Drive
3—3rd Gear Direct Drive
4—4th Gear Direct Drive
5—5th Gear Direct Drive
6—6th Gear Direct Drive
7—7th Gear Direct Drive
8—8th Gear Direct Drive

* at sea level

0020 40 60 80 100 140120

kg x
1000

40

80

30

60

20

40

10

20

0

0

10 20 40 50 60 7030

1st Gear

2nd Gear

3rd Gear

4th Gear

Torque
Converter Drive
Direct Drive

0102030405060

0 5 10 15 20 25 30 35

5th Gear

6th Gear

Speed

EL

7th Gear

8th Gear

E—Empty 36 830 kg (81,196 lb)

L—Loaded 62 135 kg (137,646 lb)

To determine retarding performance: Read from gross weight
down to the percent effective grade. (Effective grade equals
actual percent grade minus 1% for each 9 kg/t (20 lb/ton) of
rolling resistance). From this weight-effective grade point,
read horizontally to the curve with the highest obtainable
speed range, then down to maximum descent speed the
retarder can properly handle.

623G Tier 3 — Retarding*

Gross Weight

0 20 40 60 80 100 120 140 160 180

01020304050607080

EL

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

30%

25%

8th Gear

(Grade plus Rolling Resistance)

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70

0 5 10 15 20 25 30 35 40

3—3rd Gear Direct Drive
4—4th Gear Direct Drive
5—5th Gear Direct Drive
6—6th Gear Direct Drive
7—7th Gear Direct Drive
8—8th Gear Direct Drive

* at sea level

Speed

E—Empty 36 830 kg (81,196 lb)

L—Loaded 62 135 kg (137,646 lb)

lb x 1000

kg x 1000

20%

15%

10%

Effective Grade

5%

(Grade minus Rolling Resistance)

km/h

mph

Standard Equipment

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

POWER TRAIN

Engine

Electronic Unit Injection (EUI)
Electric Start, 24V
Fan, suction
Ground Level Engine Shutdown
Muffler
Starting Aid, ether
Thermo-shield, laminated
Cat C15, 6-cylinder Diesel with ACERT technology
Air Cleaner, dry-type with pre-cleaner
Radiator, NGMR (9 fins per inch)
Guard, crankcase

Braking System

Parking/Primary/Secondary
Shields – brake

Transmission

8-speed Automatic Powershift with Electronic Control
Control Throttle Shifting
Differential – lockup
Downshift Inhibitor
Neutral Coast Inhibitor
Programmable Top-gear Selection

OTHER STANDARD EQUIPMENT

Air Dryer
Cushion Hitch
Extended Life Coolant, –36° C (–33° F)
Fast Oil Change
Fenders
Locks, vandalism protection
Product Link ready
Rims – 29 in (736.6 mm)
Tires, 33.25-R29 radial
Tow Pins – front and rear

ELECTRICAL

Alarm, backup
Alternator, 75 amp
Batteries (4), 12V Maintenance Free, High Output
Electrical System, 24V
Lighting System

Directional Signals
Hazard Lights
Headlights, halogen with dimmer
Floodlight, cutting edge
Lighting System – Scraper

Directional Signals
Hazard Lights
Stop/Tail

Starting Receptacle

OPERATOR ENVIRONMENT

Air Conditioner (includes heater and defroster)
Cigarette Lighter and Ashtray
Coat Hook
Diagnostic Connection Port (12V)
Dome Courtesy Light
Gauge Group

Air Pressure
Converter/Retarder Temperature
Electronic Monitoring System (EMS III)
Engine Coolant Temperature
Actual Transmission Gear Indicator
Fuel
Speedometer
Tachometer

Transmission Gear Indicator
Horn
Implement Control Joystick
Rearview Mirrors
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

19

623G Wheel Tractor Scraper specifications

Optional Equipment

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

kg lb
Retarder, hydraulic 150 330
Ripper Teeth 290 640
Steering, secondary 50 110

kg lb
Fenders, scraper 121 266
Fuel System, fast-fill 10 23
Heater, engine coolant 2 4
Lights, side vision 5 10

For more complete information on Cat products, dealer services,

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.

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

herein, are trademarks of Caterpillar and may not be used without permission.

AEHQ5614-01 (8-07)

Replaces AEHQ5614 (12-04)

623G Wheel Tractor Scraper

R