komatsu GD655-3 SPECIFICATIONS

NET HORSEPOWER

142 kW 190 HP

OPERATING WEIGHT

14070 kg 31,020 lb

BLADE LENGTH

3.71 m 12 ft

Model shown may include optional equipment.

1

®

GD

655

MOTOR GRADER

GD655-3

Bronze alloy guides

on blade and circle provide long
service life.

A simple

blade suspension system allows

good forward visibility.

2

GD655-3 Motor Grader

The advanced

monitoring system

delivers self-diagnostics and
can provide historical
diagnostic information.

Low front nose

providing good visibility.

W

ALK

-A

ROUND

W

ALK

-A

ROUND

A wide working range is
accomplished through
unsurpassed blade geometry,

Stable work equipment speeds

are unaffected by engine speed.

3

NET HORSEPOWER

142 kW 190 HP

OPERATING WEIGHT

14070 kg 31,020 lb

BLADE LENGTH

3.71 m 12 ft

GD655-3

MOTOR GRADER

High performance engine

Komatsu SAA6D114E
turbocharged and
air to air aftercooled

diesel provides 142 kW

190 HP

for demanding

applications.

Brakes are hydraulically

operated wet type multiple-disc
and maintenance free. No air
system.

Excellent visibility to the

rear. Front and rear glass is
angled to prevent dust build up.

Access to all necessary

engine maintenance

items is easy with wide
hinged compartment
doors.

The

lock-up torque

converter provides smooth

power for grading and speed for
roading or snow removal.

Wheel spin is reduced with the

manual lock/unlock
differential.(optional)

Model shown may include optional equipment.

K

OMATSU

D

ESIGNED

K

OMATSU

D

ESIGNED

4

Gear Selections

Eight forward speeds and four reverse speeds give the

operator a wide operating range. With four gear

selections below 9.7km/h(6mph), the operator can

precisely match working speeds to job conditions for

maximum productivity in earthmoving applications. Gears

five, six and seven provide optimal speed range for snow

removal operations. When in torque converter mode,

shifting is automatic in speeds five through eight. The

operator sets the maximum gear he wishes to operate in

and the transmission will then shift automatically between

gears five through eight up to the operator selected

maximum gear.

Converter Drive:
Designed to Provide Power and Performance on the Job Site

High Performance Komatsu SAA6D114E Engine

The GD655 gets exceptional power and efficiency from the

turbocharged and air to air aftercooled engine. Output is 142

kW 190 HP SAA6D114E (variable horsepower in higher gears)

providing excellent tractive effort with good fuel efficiency.

Komatsu Power Shift Transmission

is designed and built specifically for Komatsu graders. The

transmission provides on-the-go, full power shifting as well

as inching capability and automatic shifting in the higher

ranges.

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 main frame, even
with the toe sharply angled down.

Extra-long lift cylinders let the moldboard
reach 815 mm 2'8" below grade

.

The Most
Versatile
Moldboard
Geometry in the
Business

GD655-3

MOTOR GRADER

5

CLSS with Proportional Flow
Hydraulic System

Power on Demand

Normally, the variable displacement pump idles at low output. When it senses a

load requirement, the pump supplies quick flow and pressure to match the

demand. The result is less hydraulic system heat, quick response and lower fuel

consumption. The bottom line is greater efficiency.

Electronic Overspeed Protection

helps prevent engine and transmission damage from

premature downshifting and grade-induced overspeeding.

Electronic Transmission Control

produces smooth shifting, which enables the operator to

maintain a uniform grading surface if shifting is required.

Smooth shifts also extend the life of the transmission by

placing less stress on transmission clutches. A single lever

controls direction, speed and parking brake.

Lock-up Torque Converter

or direct drive the operator chooses the optimum

transmission set-up for the job at hand. If power for tough

grading or low speed fine control is required, the operator

can select the torque converter mode. With the torque

converter, the operator has tremendous tractive effort.

More importantly, is the fine control at low speed without

shifting or using an inching pedal. Torque converter drive is

available in gears 1-4. If high transport speed or high

speed for snow removal is needed, the operator can select

direct drive. The operator has the best of both worlds,

torque converter or direct drive, at his fingertips.

Low Effort Inching Pedal

gives the operator, when in direct drive mode, precise

control of machine movement. This is especially

important for operators who are not familiar with

operating a torque converter drive motor grader.

Implement Control Valves

Designed and built by Komatsu specifically for motor graders. They are direct

acting and provide outstanding operator “feel” and predictable system response for

unmatched implement control. To help maintain exact blade settings, lock valves

are built into the hydraulic circuits. Relief valves are also incorporated into selected

circuits to protect the cylinders from over-pressurization.

Low Operating Effort

Implement controls are designed to reduce operator fatique. They feature short

lever throws and low effort in both directions. Properly spaced control levers and

short lever throws allow the operator to use multiple controls with one hand.

Balanced Flow

When the operator uses several controls at one time, flow is proportional to ensure

several implements can operate simultaneously.

Constant Implement Speed

Implement speed is constant regardless of

engine speed because of the large pump output

and proportional flow control function.

Blade Angle A long wheel base allows

the operator to obtain an aggressive
moldboard angle. This large blade angle
permits material to roll more freely along
the blade, which reduces power
requirements. This is particularly helpful in
dry or clay soil and snow and ice removal.

Rugged Construction The A-frame

drawbar u-shape welded construction. A
one-piece forged circle is built to stand up
to high stress loads. To reduce wear, teeth
are induction hardened in the front 180° of
the circle. For maximum support, the circle
is secured to the drawbar by six support
shoes.

Replaceable Metal Wear Inserts

Replaceable metal wear inserts are
located between the drawbar and circle
and the support shoes and circle. This
wear system helps keep components tight
for fine grading and allows easy
replacement. Komatsu also uses
replaceable metal wear items in the
following areas:

• Circle and moldboard tip bracket
bearings

• Moldboard slide rail

Cylinder Socket Dust Seals

• Blade Lift and Drawbar Sideshift

Cylinder sockets have dust seals to
prevent dust from entering inside the
sockets causing wear.

Optional Protection Systems

• Blade Lift Accumulators absorb

shocks when the moldboard contacts
immovable objects. This option is
especially useful in rough grading and
rocky areas. It provides precise control
while allowing relief from vertical impact
loads.

• Circle Drive Slip Clutch protects the

drawbar, circle and moldboard from
horizontal shocks when an object is hit
near the toe or heel of the blade.
This option is most useful in applications
where hidden objects are frequently
encountered.