1. business and industrial
2. energy
3. oil

GD750A-1
NET HORSEPOWER
168 kW 225 HP
OPERATING WEIGHT
19050 kg 42,000 lb
MOTOR GRADER
GD750A-1
GD750A-1
GD750A-1 Motor Grader
W
WALK
ALK-A
-AROUND
ROUND
Tinted glass reduces glare,
adding to operator comfort.
The advanced monitoring system
delivers self-diagnostics and can provide
historical diagnostic information.
Stable working equipment
speeds are unaffected by engine speed.
Low front nose
provides good visibility.
A wide working range is
accomplished through unsurpassed
blade geometry.
2
A simple blade
suspension system
allows good forward visibility.
GD750A-1
MOTOR GRADER
NET HORSEPOWER
168 kW 225 HP @ 2000 rpm
Operator comfort is a priority with a low noise
OPERATING WEIGHT
19050 kg 42,000 lb
environment, excellent visibility with slim beam and
post, and well positioned air conditioner vents.
The locking torque converter
gives smooth starts and stops, and
allows for versatile utilization.
The rear compartment is slanted
for good backward visibility.
Cummins M11-C
turbocharged diesel provides
168 kW 225 HP for
demanding applications.
Access to all necessary engine
items is easy with wide, hinged
compartment doors.
Brakes are hydraulic
and maintenance free.
Bronze alloy guides on blade and
circle provide long service life.
Tire spin is reduced with the manual
lock/unlock differential.
3
O
OPERATOR
PERATOR’’S
S
C
COMPARTMENT
OMPARTMENT
Excellent Visibility
The GD750A-1 operator’s compartment offers an excellent view of the work area, as well as
the surrounding environment. Both the top and bottom of the front tires are visible, along with
the edge of the blade. This is made possible by utilizing a simplified blade suspension system,
ample glass area, and a compact front panel in the cab. Looking to the side, almost the entire
profile of the front fender tire is visible. A frameless door with large glass areas and thin columns
contribute to keep the view open. To the rear you can see the ripper shank, rear fender tire,
and tandem case thanks to the ample glass area and slanted rear compartment.
Full Hydraulic Controls
The full hydraulic controls are of great importance to the
operator. These levers allow activation of hydraulic functions
with a very short stroke less than 25 mm 1", with very low
effort. This is accomplished without the need for pilot controls
so the operator feels he is part of the hydraulic system,
gaining precise control such as finish grading. Also, the
control levers are positioned in the “industry standard
arrangement” for ease of operation by the operator who
may have run more than one brand of motor grader.
Easy-to-Read Gauges
Large, easy-to-read gauges are conveniently located in
the compact control console of the GD750A-1. Warning
lights and sounds supplement the gauge information. The
Message Center displays self-diagnostic system data and
can record system abnormalities for over 999 hours.
Adjustable Control Console
The control console is adjustable to the operators
preference and to facilitate entry and exit from the cab.
The steering wheel also tilts to the operators preference.
There are handrails on both sides of the cab so the operator
need not grasp the steering wheel when entering the cab.
Air Conditioner
Well-positioned air conditioner vents keep the operator
comfortable through a wide range of outside conditions.
In the summer, the operator can get a cold airflow towards
his/her back even when the front lower window is opened.
4
GD750A-1
MOTOR GRADER
Excellent
Serviceability
● message center
● self diagnostic system
● track back abnormality in the
system past 999 hours.
● all hydraulic brake
● large hinge door
4
3
4
1
2
1.
1. CAB
CAB SEAT
SEAT
2.
2. CONTROLS
CONTROLS
3.
3. TILTABLE
TILTABLE
STEERING
STEERING
COLUMN
COLUMN
4.
4. WELL
WELL
POSITIONED
POSITIONED AIR
AIR
CONDITIONER
CONDITIONER
VENTS
VENTS
5.
5. MESSAGE
MESSAGE
CENTER
CENTER
5
Easy to read gauges are used on the GD750A-1.
5
K
KOMATSU
OMATSU D
DESIGNED
ESIGNED
P
POWER
OWER T
TRAIN
RAIN
Converter Drive:
Designed to
Provide Power
and Performance
on the Job Site
Komatsu Has It Now
Torque converter drive is a natural for
graders. Komatsu has it now. You’ll do far
less shifting because the torque converter
allows you to work from a full stop to the
gear range maximum speed. You can
control ground speed with the foot throttle.
Just select a gear range and go to work.
Yes, it’s different. But you’ll find it easier.
Maximum Effort
The torque converter provides a major
benefit in tractive effort (also called drawbar
pull). It multiplies engine torque and delivers
it into the power train when needed. So, the
GD750A-1 has a high tractive effort which
allows it to perform amazingly well, even
at low ground speed. You can move a full
blade from a standing start…ideal when
working in congested areas. You have plenty
of torque to power through axle-deep mud,
torque to push a full load when spreading,
torque to drive the ripper through the
toughest materials.
6
GD750A-1
MOTOR GRADER
The Most
Versatile
Moldboard
Geometry in
the Business
Komatsu graders boast
the industry’s most versatile
moldboard geometry. Save time
and money when pulling ditches
by throwing the windrow to the
right, not into the roadway—
without narrowing the road bed.
No extra machines or crew are
needed to pick up the windrow.
It’s made possible by Komatsu’s
extraordinary reach. Plus, there is
generous clearance between the
heel of the blade and the mainframe, even with the toe sharply
angled down. You get all the
reach you pay for.
Extra-long lift cylinders let the
moldboard reach an astounding
30.5 inches below grade.
Power Train—Versatile Transmission
The full power shift transmission lets
The torque converter also provides effort-
operators work more efficiently with less
less inching capability with a fully modulated
effort. While in the first four gears, the
inching pedal. When working in gears 5–8,
transmission always works through the
the transmission automatically shifts to a
torque converter, reducing driveline shock.
direct drive lock-up. It helps to save fuel
This allows the GD750A-1 to utilize the
consumption especially when driving a
maximum drawbar pull from a complete stop
long distance or snow plowing.
all the way to the maximum speed. Frequent
allowing the operator to concentrate on blade
Quick Hydraulic Response for Fine
Grading…Even at Low Engine Speed
control without fear of killing the engine, and
The GD750A-1 features a pressure-flow
making smooth starts and stops easy.
compensated, load sensing hydraulic
gear shifting due to load variance is eliminated,
system saving fuel and reducing heat.
Its variable displacement piston pump
gives instant response even at low engine
speeds providing the fine grading control
you expect on a high production grader.
7
E
EASY
ASY
M
MAINTENANCE
AINTENANCE
Superior Serviceability
The GD750A-1 offers maximum up time through its advanced self-diagnostic systems,
and its ease of maintenance and service. The diagnostic systems monitor over 60 functions
throughout the machine and can record system abnormalities for over 999 hours of system
operation for later. The all-hydraulic brake system provides greater reliability in cold weather,
fewer required inspections, and lower maintenance costs. Access to the engine is easy
through double-hinged hoods, where the transmission and oil checks are easily
accessed, along with all filters.
Message Center
The message center monitors the transmission and engine
functions with computer sensors. There are six modes
available with ability to scroll through mode selections.
The six modes are: Automatic, rpm (tachometer), Gear
Position, Errors (20–904), Illumination (brightness of display,
in 25% incurment), Revision (software used to calibrate
sensing computer—Funk then Vansco).
8
S
SPECIFICATIONS
PECIFICATIONS
ENGINE
GD750A-1
MOTOR GRADER
BLADE RANGE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cummins M11-C
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-cycle diesel, turbocharged
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mm 4.92"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 mm 5.79"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . . 10.8 ltr 661 in3
Gross horsepower* . . . . . . . . . . . . . . . 183 kW 245 HP @ 2000 rpm
Net flywheel horsepower** . . . . . . . . . . 168 kW 225 HP @ 2000 rpm
Peak torque . . . . . . . . . . . . . . . . . . . 1125 Nm 830 lb/ft @ 1300 rpm
Torque rise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29%
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 blade, suction
Air cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-stage dry-type
Electrical . . . . . . . . . . . . . . . . . . . . . . . 24 volt with 50 amp alternator
Batteries. . . . . . . . . 2, low maintenance plus, 12 volt, 1000 cca each
* Gross HP output for complete engine operating under
SAE J1995 conditions.
** Net flywheel HP output for standard (SAE J1349) including air cleaner,
alternator (not charging), water pump, lubricating oil, fuel pump, muffler,
and fan.
Circle center shift: Right . . . . . . . . . . . . . . . . . . . . . . . 572 mm 22.5"
Left . . . . . . . . . . . . . . . . . . . . . . . . 508 mm 20.0"
Circle side shift, hydraulic cylinder . . . . . . . . . . . . . . . 475 mm 18.7"
Blade side shift, right, and left . . . . . . . . . . . . . . . . . . . . 737 mm 29"
Maximum shoulder reach outside rear tires (frame straight)*
Right. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2075 mm 81.7"
Left . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1999 mm 78.7"
Maximum lift above ground. . . . . . . . . . . . . . . . . . . . . 473 mm 18.6"
Maximum cutting depth. . . . . . . . . . . . . . . . . . . . . . . . 775 mm 30.5"
Maximum blade angle, right, or left . . . . . . . . . . . . . . . . . . . . . . . 90°
Blade tip range . . . . . . . . . . . . . . . . . . . . . 40° forward, 5° backward
* For 4877 mm 16' blade, add 305 mm 12" right or left. For 4877 mm 16'
blade with moveable anchor, add 445 mm 17.5" right or left.
CIRCLE
Single piece rolled ring forging. Six circle support shoes
with replaceable wear surface.
Diameter (outside) . . . . . . . . . . . . . . . . . . . . . . . . . . 1816 mm 71.5"
Structural steel section—induction hardened teeth. . . . . . . . . . . 180°
Circle reversing control, hydraulic rotation . . . . . . . . . . . . . . . . . 360°
TRANSMISSION AND
TORQUE CONVERTER
Full power shift transmission with integral free wheeling stator torque
converter and lock-up.
DRAWBAR
Speeds (at rated engine speed)
Gear
1st
2nd
3rd
4th
5th
6th
7th
8th
Forward
4.2 km/h
2.6 mph
5.8 km/h
3.6 mph
8.2 km/h
5.1 mph
11.4 km/h
7.1 mph
16.4 km/h
10.2 mph
23.0 km/h
14.3 mph
32.0 km/h
19.9 mph
44.9 km/h
27.9 mph
Reverse
4.2 km/h
2.6 mph
8.2 km/h
5.1 mph
16.4 km/h
10.2 mph
32.0 km/h
19.9 mph
HYDRAULICS
Load-sensing closed center hydraulics with variable displacement
piston pump. Short stroke/low effort direct acting control valves with
preselected maximum flow setting to each function. Double acting
anti-drift check valves on blade lift, tilt, circle shift, articulation, and
leaning wheels.
Output . . . . . . . . . . . . . . . . . . . . . . 239 ltr/min 63 gpm @ 2000 rpm
Standby pressure . . . . . . . . . . . . . . . . . . . . . . . . . 28 kg/cm2 400 psi
Maximum system pressure . . . . . . . . . . . . . . . 245 kg/cm2 3,500 psi
MOLDBOARD
Hydraulic power shift fabricated from high carbon steel. Includes
replaceable end bits and overlay end bits. Cutting edge is
through-hardened.
A-shaped, U-section press formed and welded construction for
maximum strength with a replaceable drawbar ball.
Drawbar frame . . . . . . . . . . . . . . . . . . . . . 221 x 19 mm 8.7" x 0.75"
FRAME
Section, welded unit (w x h) . . . . . . . . . 343 x 330 mm 13.5" x 13.0"
Side plates . . . . . . . . . . . . . . . . . . . . . . . 292 x 16 mm 11.5" x 0.63"
Vertical section modulus:
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2851 cm3 174 in3
Maximum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3769 cm3 230 in3
Weight per foot:
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 kg/m 137 lb/ft
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 kg/m 254 lb/ft
OPERATOR’S COMPARTMENT
Pivoting control console and tilt steering wheel. Deluxe suspension
cloth covered seat and backrest with swing-up armrests.
FRONT AXLE
Solid bar construction welded steel sections
Ground clearance at pivot . . . . . . . . . . . . . . . . . . . . . . . 635 mm 25"
Wheel lean angle, right, or left . . . . . . . . . . . . . . . . . . . . . . . . . . . 17°
Oscillation, total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32°
Dimensions . . . . . . . . . . . . . . . . 4267 x 686 x 25 mm 14' x 27" x 1"
Arc radius . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432 mm 17"
Cutting edge . . . . . . . . . . . . . . . . . . . . . . . . 203 x 16 mm 8" x 0.62"
Cutting edge bolt diameter . . . . . . . . . . . . . . . . . . . . . . 19 mm 0.75"
Blade base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2870 mm 113"
Replaceable/reversible end bits . . . . . . . . . . 229 x 19 mm 9" x 0.75"
9
DIMENSIONS
N
A
B
C
D
E
F
G*
H*
I
J
K
L*
M
N
3353 mm
1004 mm
2870 mm
6452 mm
9220 mm
1626 mm
2896 mm
10668 mm
2311 mm
2743 mm
4267 mm
4877 mm
2692 mm
22°
11'0"
3'4"
9'5"
21'2"
30'3"
5'4"
9'6"
35'0"
7'7"
9'0"
14'0"
16'0"
8'10"
*Optional
M
A
F
I
G*
C
B
D
J
E
K
H*
L*
REAR AXLE
Alloy steel, heat treated, full floating axle. Spiral bevel gears with
hydraulic lock/unlock differential and planetary final drive.
STEERING
Hydraulic power system providing stopped engine steering meeting
SAE J53 and J1151.
Minimum turning radius. . . . . . . . . . . . . . . . . . . . . . . . . 7.9 m 25'11"
Steering range, right or left . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50°
Articulation, right or left . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22°
CAPACITIES
Fuel tank (usable) . . . . . . . . . . . . . . . . . . . . . 379 ltr 100.0 U.S. gal
Cooling system . . . . . . . . . . . . . . . . . . . . . . . . 64 ltr 17.0 U.S. gal
Crankcase . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ltr
3.4 U.S. gal
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . 42 ltr 11.0 U.S. gal
Tandem housing (each) . . . . . . . . . . . . . . . . . . 89 ltr 23.5 U.S. gal
Hydraulic system . . . . . . . . . . . . . . . . . . . . . . 136 ltr 36.0 U.S. gal
Hydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . . 51 ltr 13.5 U.S. gal
Circle drive housing . . . . . . . . . . . . . . . . . . . . . . 9 ltr
2.5 U.S. gal
OPERATING WEIGHT
(APPROXIMATE)
Includes lubricants, coolant, full fuel tank, and operator.
TANDEM DRIVE
Oscillating welded box section
oil-tight housing . . . . . . . . . . . . . . . . . . . 602 x 218 mm 23.7" x 8.6"
Sprocket drive chain, single strand . . . . . . . . . . . . 57 mm 2.25" pitch
Sidewall thickness: Inner . . . . . . . . . . . . . . . . . . . . . . . 22 mm 0.88"
Outer. . . . . . . . . . . . . . . . . . . . . . . 19 mm 0.75"
Wheel axle spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . 1626 mm 64"
Tandem oscillation. . . . . . . . . . . . . . . . . . . . 15° forward, 25° reverse
WHEELS, FRONT AND REAR
Bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tapered roller
Tires . . . . . . . . . low pressure, tubeless, 16:00 x 24-G2 12 ply rating
Tire rims (demountable) . . . . . . . . . . . . . . . . . . . . . . . . . . 10VA x 24
BRAKES
10
Service brakes . . . . . . . . . . . . . foot operated, sealed oil disc brakes,
hydraulically actuated on four tandem wheels,
19013 cm3 2,947 in3 total braking surface
Parking brake. . . . . . . . . . . . . . . . . . . hand actuated, spring applied,
hydraulically released caliper with
transmission interlock
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19050 kg 42,000 Ib
On rear wheels . . . . . . . . . . . . . . . . . . . . . . . . . . 13925 kg 30,700 Ib
On front wheels . . . . . . . . . . . . . . . . . . . . . . . . . . 5575 kg 12,300 Ib
INSTRUMENTATION
Electric monitoring system with diagnostics:
Gauges. . . . . . . . . . . hour meter, voltmeter, fuel level, articulation,
engine oil pressure, transmission oil temperature,
engine coolant temperature, and tachometer.
Warning Lights . . . . . . . . . . . . . . parking brake, transmission filter,
hydraulic filter, transmission clutch pressure,
brake system, differential filter, differential lock,
blade float, engine coolant level, engine coolant
temperature, hydraulic oil temperature, transmission
oil temperature, and low fuel level.
GD750A-1
MOTOR GRADER
STANDARD EQUIPMENT
● Air cleaner, dual element, dry-type with
precleaner, and service indicator
● Alarm, back-up
● Alternator, 50 amp
● Batteries, heavy-duty, 1000 cca each
● Brakes, sealed oil disc brakes
● Cab, deluxe enclosed ROPS/FOPS,
with heater pressurizer
● Circle slip clutch
● Console, adjustable
● Control valve bank, 9-station with
one unused control
● Decelerator/accelerator
● Defroster fan, front
● Dome light
● Electrical system, 24 volt
● Engine, Cummins turbo-charged diesel
● Engine monitoring system with
diagnostics
● Frame articulation
● Full hydraulic steering, leaning
front wheels
● Heater, 40,000 btu with twin high
performance fans
● Hoodsides for engine compartment
● Horn
● Hydraulic circle shift, blade shift,
and blade tilt
● Hydraulic lock/unlock differential
● Hydraulic system, load-sensing,
closed center
● Inside convex mirror
● Keyed doors
● Lights, rear back-up, stop/tail, turn,
hazard, and reflex reflector
● Moldboard, 14' x 27" x 1",
17" radius with replaceable end
bits, through-hardened cutting edge,
and overlay end bits
●
●
●
●
●
●
●
●
● Headlights:
—Cab mounted with turn and hazard
—Front bar mounted with turn and
hazard
● Hinged lower front cab glass
● Moldboard 16' x 27" x 1", 17" radius
● Optional cutting edges
● Optional hydraulic control valves (up to 4)
● Optional paint
● Optional tires
●
●
●
●
●
●
●
●
●
Moldboard float 90° right and left
Planetary final drive
Seat, suspension (deluxe)
Tachometer
Throttle, hand control
Tilt steering wheel
Tinted safety glass
Tires, 16:00 x 24-G2 12PR
with 10" rims, tubeless
Toolbox
Transmission, full power shift with
integral torque converter
Transmission monitoring system
with diagnostics
Windshield wipers-front/rear
with washers
OPTIONAL EQUIPMENT
● Accumulators, anti-shock for blade lift
and circle side shift
● Air conditioner with R134A refrigerant
● Alternator, 80 amp
● Cab, open ROPS/FOPS, with rear glass
● Converter, 24 to 12 volt, 25 amp
● Defroster fan, front and rear
● Engine block heater, 120 volts
● Engine cold weather starting aid
● Front mounted tow hitch
Outside convex mirrors
Pusher block
Ripper, rear mounted with holding valve
Transmission guard
Windshield wipers, two lower dual
with washer
● Work lights, two blade and two rear
11
S
SUPPORT
UPPORT
Count on Komatsu and your
local distributor for the support
you deserve. Our success
depends on satisfying your need
for productive equipment and
supporting that equipment.
That’s why we have one of the
largest and strongest heavyequipment distributor organizations in North America. Their
personnel are not only trained
to help you select the equipment
that is best-matched for your
business but to support
that equipment.
AESS444-00
Finance Through
its finance company,
Komatsu can offer you a
wide variety of financing
alternatives designed to meet
your needs. Programs include
municipal leases for governmental
agencies, conditional sales contracts,
and leases with $1 purchase options
for customers interested in owning their
equipment. Ask your distributor about
Komatsu leasing. We offer finance and
operating leases and the unique Advantage
Lease which offers you predetermined purchase, return, and renewal options.
Parts Three computer-linked parts
distribution centers provide fast access
to anywhere in the U.S. and Canada. Most
parts are available overnight. Plus, Komatsu
distributors keep a large assortment of
commonly used parts in stock for
immediate access.
©1999 Komatsu Printed in USA
SN2(10M)SN
Remanufactured
parts Save money and
still have the same warranty as new
parts at a fraction of the cost with
like-new remanufactured parts.
Maintenance Take advantage of the experience we have
gained and ask your distributor about
our factory-supported programs including:
regular scheduled maintenance, oil and
wear analysis, diagnostic inspections,
undercarriage inspections, training,
special service tools, parts programs,
and even a special software program
to help your distributor keep track
of and manage service-related data.
2/99 (EV-1)
Komatsu America International Company
440 N. Fairway Dr., Vernon Hills, IL 60061
www.KomatsuAmerica.com
Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan