GD

750A

-1GD750A-1

NET HORSEPOWER168 kW 225 HP

OPERATING WEIGHT19050 kg 42,000 lb

MO

TO

RG

RA

DE

RGD750A-1

2

GD750A-1 Motor Grader

WALK-AROUNDWALK-AROUND

Low front noseprovides good visibility.

Tinted glass reduces glare,adding to operator comfort.

The advanced monitoring system delivers self-diagnostics and can providehistorical diagnostic information.

A simple blade suspension system allows good forward visibility.

Stable working equipmentspeeds are unaffected by engine speed.

A wide working range isaccomplished through unsurpassedblade geometry.

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NET HORSEPOWER168 kW 225 HP @ 2000 rpm

OPERATING WEIGHT19050 kg 42,000 lb

GD750A-1MOTOR GRADER

Brakes are hydraulic and maintenance free.

Bronze alloy guides on blade andcircle provide long service life.

Operator comfort is a priority with a low noiseenvironment, excellent visibility with slim beam andpost, and well positioned air conditioner vents.

The rear compartment is slantedfor good backward visibility.

The locking torque converter gives smooth starts and stops, andallows for versatile utilization.

Cummins M11-Cturbocharged diesel provides168 kW 225 HP fordemanding applications.

Access to all necessary engineitems is easy with wide, hingedcompartment doors.

Tire spin is reduced with the manuallock/unlock differential.

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.

Excellent Visibility

OPERATOR’SCOMPARTMENT

OPERATOR’SCOMPARTMENT

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GD750A-1MOTOR GRADER

1. CAB SEAT

2. CONTROLS

3. TILTABLESTEERINGCOLUMN

4. WELLPOSITIONED AIRCONDITIONERVENTS

5. MESSAGECENTER

3

4

4

2

5

1

1. CAB SEAT

2. CONTROLS

3. TILTABLESTEERINGCOLUMN

4. WELLPOSITIONED AIRCONDITIONERVENTS

5. MESSAGECENTER

Easy to read gauges are used on the GD750A-1.

ExcellentServiceability● message center

● self diagnostic system

● track back abnormality in thesystem past 999 hours.

● all hydraulic brake

● large hinge door

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6

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.

KOMATSU DESIGNED

POWER TRAIN

KOMATSU DESIGNED

POWER TRAIN

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GD750A-1MOTOR GRADER

The full power shift transmission lets

operators work more efficiently with less

effort. While in the first four gears, the

transmission always works through the

torque converter, reducing driveline shock.

This allows the GD750A-1 to utilize the

maximum drawbar pull from a complete stop

all the way to the maximum speed. Frequent

gear shifting due to load variance is eliminated,

allowing the operator to concentrate on blade

control without fear of killing the engine, and

making smooth starts and stops easy.

The torque converter also provides effort-

less inching capability with a fully modulated

inching pedal. When working in gears 5–8,

the transmission automatically shifts to a

direct drive lock-up. It helps to save fuel

consumption especially when driving a

long distance or snow plowing.

Quick Hydraulic Response for FineGrading…Even at Low Engine Speed

The GD750A-1 features a pressure-flow

compensated, load sensing hydraulic

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.

Power Train—Versatile Transmission

The Most VersatileMoldboardGeometry in the BusinessKomatsu graders boast the industry’s most versatilemoldboard geometry. Save timeand money when pulling ditchesby throwing the windrow to theright, not into the roadway—without narrowing the road bed.No extra machines or crew areneeded to pick up the windrow.It’s made possible by Komatsu’sextraordinary reach. Plus, there isgenerous clearance between theheel of the blade and the main-frame, even with the toe sharplyangled down. You get all the reach you pay for.

Extra-long lift cylinders let themoldboard reach an astounding 30.5 inches below grade.

Superior Serviceability

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EASYMAINTENANCE

EASYMAINTENANCE

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).

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GD750A-1MOTOR GRADER

ENGINE

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cummins M11-CType . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-cycle diesel, turbochargedNumber of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mm 4.92"Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 mm 5.79"Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . . 10.8 ltr 661 in3

Gross horsepower* . . . . . . . . . . . . . . . 183 kW 245 HP @ 2000 rpmNet flywheel horsepower** . . . . . . . . . . 168 kW 225 HP @ 2000 rpmPeak torque . . . . . . . . . . . . . . . . . . . 1125 Nm 830 lb/ft @ 1300 rpmTorque rise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29%Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 blade, suctionAir cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-stage dry-typeElectrical . . . . . . . . . . . . . . . . . . . . . . . 24 volt with 50 amp alternatorBatteries. . . . . . . . . 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.

TRANSMISSION AND

TORQUE CONVERTER

Full power shift transmission with integral free wheeling stator torqueconverter and lock-up.

Speeds (at rated engine speed)

HYDRAULICS

Load-sensing closed center hydraulics with variable displacementpiston pump. Short stroke/low effort direct acting control valves withpreselected maximum flow setting to each function. Double actinganti-drift check valves on blade lift, tilt, circle shift, articulation, andleaning wheels.

Output . . . . . . . . . . . . . . . . . . . . . . 239 ltr/min 63 gpm @ 2000 rpmStandby pressure . . . . . . . . . . . . . . . . . . . . . . . . . 28 kg/cm2 400 psiMaximum system pressure . . . . . . . . . . . . . . . 245 kg/cm2 3,500 psi

MOLDBOARD

Hydraulic power shift fabricated from high carbon steel. Includesreplaceable end bits and overlay end bits. Cutting edge is through-hardened.

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"

BLADE RANGE

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°

DRAWBAR

A-shaped, U-section press formed and welded construction formaximum 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/ftMaximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 kg/m 254 lb/ft

OPERATOR’S COMPARTMENT

Pivoting control console and tilt steering wheel. Deluxe suspensioncloth covered seat and backrest with swing-up armrests.

FRONT AXLE

Solid bar construction welded steel sectionsGround clearance at pivot . . . . . . . . . . . . . . . . . . . . . . . 635 mm 25"Wheel lean angle, right, or left . . . . . . . . . . . . . . . . . . . . . . . . . . . 17°Oscillation, total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32°

Gear Forward Reverse1st 4.2 km/h 2.6 mph 4.2 km/h 2.6 mph2nd 5.8 km/h 3.6 mph 8.2 km/h 5.1 mph3rd 8.2 km/h 5.1 mph 16.4 km/h 10.2 mph4th 11.4 km/h 7.1 mph 32.0 km/h 19.9 mph5th 16.4 km/h 10.2 mph6th 23.0 km/h 14.3 mph7th 32.0 km/h 19.9 mph8th 44.9 km/h 27.9 mph

SPECIFICATIONSSPECIFICATIONS

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DIMENSIONS

A 3353 mm 11'0"B 1004 mm 3'4"C 2870 mm 9'5"D 6452 mm 21'2" E 9220 mm 30'3" F 1626 mm 5'4" G* 2896 mm 9'6" H* 10668 mm 35'0" I 2311 mm 7'7" J 2743 mm 9'0" K 4267 mm 14'0" L* 4877 mm 16'0" M 2692 mm 8'10" N 22°

N

M

I

J

G* D

E

H*

F C

A

B

K

L*

*Optional

REAR AXLE

Alloy steel, heat treated, full floating axle. Spiral bevel gears withhydraulic 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°

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" pitchSidewall 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 rollerTires . . . . . . . . . low pressure, tubeless, 16:00 x 24-G2 12 ply ratingTire rims (demountable) . . . . . . . . . . . . . . . . . . . . . . . . . . 10VA x 24

BRAKES

Service brakes . . . . . . . . . . . . . foot operated, sealed oil disc brakes, hydraulically actuated on four tandem wheels,

19013 cm3 2,947 in3 total braking surfaceParking brake. . . . . . . . . . . . . . . . . . . hand actuated, spring applied,

hydraulically released caliper with transmission interlock

CAPACITIES

Fuel tank (usable) . . . . . . . . . . . . . . . . . . . . . 379 ltr 100.0 U.S. galCooling system . . . . . . . . . . . . . . . . . . . . . . . . 64 ltr 17.0 U.S. galCrankcase . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ltr 3.4 U.S. galTransmission . . . . . . . . . . . . . . . . . . . . . . . . . . 42 ltr 11.0 U.S. galTandem housing (each) . . . . . . . . . . . . . . . . . . 89 ltr 23.5 U.S. galHydraulic system . . . . . . . . . . . . . . . . . . . . . . 136 ltr 36.0 U.S. galHydraulic tank . . . . . . . . . . . . . . . . . . . . . . . . . 51 ltr 13.5 U.S. galCircle drive housing . . . . . . . . . . . . . . . . . . . . . . 9 ltr 2.5 U.S. gal

OPERATING WEIGHT (APPROXIMATE)

Includes lubricants, coolant, full fuel tank, and operator.

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19050 kg 42,000 IbOn rear wheels . . . . . . . . . . . . . . . . . . . . . . . . . . 13925 kg 30,700 IbOn 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.

11

GD750A-1MOTOR GRADER

STANDARD EQUIPMENT

● Air cleaner, dual element, dry-type withprecleaner, 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

● 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

● 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

● 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

Count on Komatsu and yourlocal distributor for the supportyou deserve. Our successdepends on satisfying your needfor productive equipment andsupporting that equipment.That’s why we have one of thelargest and strongest heavy-equipment distributor organ-izations in North America. Theirpersonnel are not only trained to help you select the equipmentthat is best-matched for yourbusiness but to support that equipment.

Finance Through its finance company,

Komatsu can offer you a wide variety of financingalternatives designed to meetyour needs. Programs includemunicipal leases for governmentalagencies, conditional sales contracts,and leases with $1 purchase optionsfor customers interested in owning theirequipment. Ask your distributor aboutKomatsu leasing. We offer finance andoperating leases and the unique AdvantageLease which offers you predetermined pur-chase, return, and renewal options.

Parts Three computer-linked partsdistribution centers provide fast access

to anywhere in the U.S. and Canada. Mostparts are available overnight. Plus, Komatsudistributors keep a large assortment ofcommonly used parts in stock for immediate access.

Remanufacturedparts Save money and

still have the same warranty as newparts at a fraction of the cost withlike-new remanufactured parts.

Maintenance Take advan-tage of the experience we have

gained and ask your distributor about our factory-supported programs including:

regular scheduled maintenance, oil andwear 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.

SUPPORTSUPPORT

Komatsu America International Company440 N. Fairway Dr., Vernon Hills, IL 60061

AESS444-00 ©1999 Komatsu Printed in USA SN2(10M)SN 2/99 (EV-1)

www.KomatsuAmerica.com Materials and specifications are subject to change without noticeis a trademark of Komatsu Ltd. Japan