Komatsu D275A-5 User manual

ROPS canopy:*
Weight . . . . . . . . . . . . . . . . 650 kg 1,430 lb
Roof dimensions
Length . . . . . . . . . . . . . . . 1405 mm 4'7"
Width . . . . . . . . . . . . . . . . 2035 mm 6'8"
Height from
compartment floor . . . . . . . 1830 mm 6'0"
*Meets ISO 3471 and SAE J1040 APR88, ROPS
standards, as well as ISO 3449 FOPS standard
Additional ground
pressure . . 2.0 kPa 0.02 kg/cm20.28 psi
Steel Cab:
Weight. . . . . . . . . . . . . . . . . . 415 kg 910 lb
Dimensions:
Length. . . . . . . . . . . . . . . 1790 mm 5'10"
Width . . . . . . . . . . . . . . . . 1455 mm 4'9"
Height from compartment
floor to ceiling . . . . . . . . . . 1530 mm 5'0"
Additional ground
pressure . . 1.0 kPa 0.01 kg/cm20.14 psi
Variable giant ripper:
Variable, parallelogram single-shank ripper
ideal for ripping up tough material. Ripping
angle is variable. Ripping depth is adjustable
in three stages by a hydraulically controlled
pin puller.
Weight (including hydraulic
control unit) . . . . . . . . . 3600 kg 7,940 lb
Beam length . . . . . . . . . . . . . 1252 mm 4'1"
Maximum lift above ground . 1195 mm 3'11"
Maximum digging depth . . . . 1420 mm 4'8"
Additional ground
pressure . . 7.8 kPa 0.88 kg/cm21.14 psi
Multi-shank ripper:
Hydraulically controlled parallelogram ripper
with three shanks. Ripping angle available
stepless adjustable.
Weight (including hydraulic
control unit) . . . . . . . . . 4462 kg 9,840 lb
Beam length . . . . . . . . . . . . . 2495 mm 8'2"
Maximum lift above ground . . . 955 mm 3'2"
Maximum digging depth . . . . 900 mm 2'11"
Additional ground
pressure . . 9.8 kPa 0.10 kg/cm21.42 psi
CEN00024-01 Printed in Japan 200807 IP.AD (10)
www.Komatsu.com Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan
●Alternator 75 ampere/24V
●Backup alarm
●Batteries 170 Ah/2 x 12V
●Blower fan
●Decelerator pedal
●Dry-type air cleaner with dust evacuator
and dust indicator
●Final drive case wear guard
●Hinged front mask
●Hinged underguard with front pull hook
●Hydraulic track adjusters
●Lighting system (including four front
and two rear lights)
●Torque converter
●Muffler with rain cap
●Palm lever steering control
●Radiator reserve tank
●ROPS brackets
●Segmented sprockets
●Shoes, 610 mm 24" extreme service,
single-grouser
●Seven-roller track frames
●Starting motor 11 kW/24 V
●Suspension seat, synthetic leather
●TORQFLOW transmission
●Track roller guards
●Warning horn
●Wet steering clutches/brakes
●Air conditioner with heater and defroster
●Alternator 90 ampere/24 V
●Batteries 200 Ah/2 x 12V
●Car stereo
●Counterweight
●Dual tilt dozer
●Fire extinguisher
●Hitch
●Hydraulics for ripper
●Light for ripper point
●Mirror, rearview
●Panel cover
●Perforated side covers
●Perforated single radiator mask
●Pusher plate
●Seat belt
●Shoes:
—710 mm 28"
—760 mm 30"
●Spill guard for semi-U dozer
●Spill guard for U-dozer
●Sun visor
●Suspension seat
—Fabric seat
—Fabric seat, high backrest
●Strengthened Semi-U blade
●Strengthened U blade
●Track shoe slip control system
●Vandalism protection kit
STANDARD EQUIPMENT
OPTIONAL EQUIPMENT
NET HORSEPOWER
306 kW 410 HP
OPERATING WEIGHT
49850 kg 109,900 lb
Photo may include optional equipment
D275A-5
CRAWLER DOZER
D
275A

W ALK -A ROUND
W ALK -A ROUND
2
D275A-5 Crawler Dozer
Simple Hull Frame
and monocoque track frame
with pivot shaft for greater
reliability.
Large Blade Capacities:
13.7 m317.9 yd3(Semi-U dozer) and
16.6 m321.7 yd3(U dozer)
Komatsu-integrated design for the best value, reliability, and versatility. Hydraulics, power train, frame, and
all other major components are engineered by Komatsu. You get a machine whose components are designed to
work together for higher production, greater reliability, and more versatility.
Extra-low Machine Profile provides excellent
machine balance and low center of gravity.
Preventative Maintenance
●Centralized Service Station
●Enclosed Hydraulic Piping
●Modular Power Train Design
●Oil Pressure Checking Ports
See page 9.
306 kW 410 HP turbocharged, aftercooled
engine provides ample power.
See page 6.
New Track Link Design
Track link height and link tread width are
increased, providing extended wear life.
See page 9.
3
K-Bogie Undercarriage
System improves traction,
component durability, and
operator comfort.
See page 6.
NET HORSEPOWER
306 kW 410 HP @ 2000 rpm
OPERATING WEIGHT
49850 kg 109,900 lb
BLADE CAPACITY
Semi-U: 13.7 m317.9 yd3
Full-U: 16.6 m321.7 yd3
D275A-5
CRAWLER DOZER
New Hexagonal Designed Cab includes:
●Spacious interior
●Comfortable ride with new cab damper and K-bogie undercarriage
●Excellent visibility
●High capacity air conditioning system (optional)
●PCCS (Palm Command Control System) lever
●Pressurized cab (optional)
●Adjustable armrest
●Travel control console integrated with operator seat
Low-drive, long-track,
seven roller undercarriage
ensures outstanding gradeability
and stability.
Photo may include optional equipment
Hydrostatic Driven Engine Cooling Fan
controlled automatically, reduces fuel consumption and
operating noise levels.
See page 6
ECMV (Electronic Controlled
Modulation Valve) controlled
steering clutches/brakes facilitating
steering operation.
See page 5.
Rippers (option) :
●Variable giant
●Multi-shank
Unique Komatsu exclusive
linkage provides excellent
productivity.
See page 7.

5
D275A-5
CRAWLER DOZER
Palm Command
Electronic Controlled
Travel Control Joystick
Palm command travel joystick
provides the operator with a
relaxed posture and superb
fine control without operator
fatigue. Transmission gear
shifting is simply carried out
with thumb push buttons.
Full-adjustable
Suspension Seat and
Travel Control Console
For improved rear visibility
during reverse operations, the
operator can adjust seat 15° to
the right. The transmission and
steering controls move with the
seat for optimum operator comfort. The travel control
console also has adjustment fore and aft, and height. The
armrest is independently adjustable up and down, providing
optimum operation posture for all operators.
Fuel Control Dial
Engine revolution is controlled by electric signal, providing
ease of operation, eliminating maintenance of linkage and
joints.
Palm Command PPC Controlled Blade Control
Joystick
Blade control joystick uses the PPC (Proportional Pressure
Control) valve and palm command joystick similar to the
travel control joystick. PPC control combined with the highly
reliable Komatsu hydraulic system enables superb fine
control. (Dual tilt and pitch operation are enabled by
depressing switch with thumb. This is available when the
optional dual tilt dozer is installed.)
Height Adjustable Blade Control Armrest
Blade control armrest is height adjustable without any tools
in three stages, providing the operator with firm arm
support in an ideal armrest.
Position Adjustable Ripper Control Lever
Ripper control lever position is adjustable, providing
optimum operator posture during all types of ripping
operations.
Power Train Electronic Control System
Smooth and Soft Operation
D275A-5 utilizes a newly designed power train electronic control system. The controller registers the amount of operator
control (movements of lever and operation of switches) along with machine condition signals from each sensor, to calculate
accurately the control of the transmission, steering clutches and brakes for optimal machine operation. The ease of
operation and productivity of new D275A-5 is greatly improved through these new features.
ECMV (Electronic Controlled Modulation Valve) Controlled Transmission
Controller automatically adjusts each clutch engagement depending on travel conditions
such as gear speed, revolution and shifting pattern. This provides smooth shockless clutch
engagement, improved component reliability, improved component life and operator ride
comfort.
ECMV (Electronic Controlled Modulation Valve) Controlled Steering Clutches/Brakes
Sensors monitor machine operating conditions, and electronically control steering clutches and brakes depending on type of
job, such as size of load during dozing, incline angle of slope or load, providing smooth and ease of operation by reducing
counter-steering on downhill travel, etc.
MONITORSYSTEM
Electronic controlled
steering/brake system
ECMV ECMV ECMV ECMV
Auxilliary
valve
Trav e l
control
lever
Steering controller
Fuel
control
dial
Monitor panel
Deceleration
pedal
Tra nsmission
controller
Engine
controller
Electronic controlled
transmission
Engine
Fuel control
valve unit
ECMV ECMV ECMV ECMV
Brake pedal
potentiometer
Pitch
angle
sensor
Trans-
mission
output
speed
sensor
Auto shift
down switch Switch
Transmission control
Transmission
control valve
Water
temp. Engine
oil
pressure
Engine
speed
Tor que converter
Preset Travel Speed Selection Function
Preset travel speed selection function is standard equipment, enabling the operator to select fore and aft travel speed
among three preset patterns, F1-R2, F2-R2 and manual shift. When F1-R2 or F2-R2 preset pattern is selected, and travel
control joystick moves from forward to reverse direction, the machine travels forward/reverse with F1/R2 or F2/R2 speed
automatically. This function reduces gear shifting time during repeated round trip operations.
Auto Downshift Function
Controller monitors engine speed, travel gear and travel speed.
When load is applied and machine travel speed is reduced, the
controller automatically downshifts to optimize gear speed to
provide high fuel efficiency. This function provides comfortable
operation and high productivity without manual downshifting. (This
function can be deactivated with cancel switch.)
MANUAL MODE (F1-R1)
F1-R2 MODE
F2-R2 MODE
Press DOWN switch
Press DOWN switch
Press UP switch
Press UP switch
UP
DOWN
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Time
Clutch pressure
Heavy Load Light Load
Actuated on Heavy
Load or Steep Slope
4
Facing Front
When Turned 15°
PCCS
(PALM COMMAND
CONTROL SYSTEM)
PCCS
(PALM COMMAND
CONTROL SYSTEM)
Komatsu develops new ergonomically designed control system “PCCS” creating an operating
environment with “complete operator control”.
Left-hand Joystick
Blade and Ripper
Control Joystick
Outline of Electronic Control System
Human-Machine Interface
Effect of ECMV Steering Clutches/Brake Control
When dozing and turning, ECMV automatically
controls stroke ratio of steering clutches
and brakes depending on degree of
load, enabling smooth dozing
and turning.
When dozing downhill, ECMV
automatically controls steering clutches
and brakes depending on incline of
machine or degree of load, reducing
counter-steering and producing
smooth dozing operation.

Large Blade
Capacities of 13.7 m317.9 yd3(Semi-U dozer) and 16.6 m321.7 yd3(U dozer) yield
outstanding production. High-tensile-strength steel has been incorporated into the front
and sides of the blade for increased durability.
Dual Tilt Dozer (option)
The dual tilt dozer increases productivity while reducing operator effort.
●Optimum blade cutting angle for all types of materials and grades can be selected
on-the-go for increased load and production.
●Digging, dozing (carry), and dumping (spreading) are easy and smooth with less
operator fatigue.
●Dozer tilt angle and tilt speed are twice that of a conventional single tilt system.
Rippers
●The variable giant ripper features a long sprocket center-to-ripper point distance, making ripping operation easy and effective
while maintaining high penetration force.
●The variable giant ripper is a parallelogram single shank ripper ideal for ripping in tough material. The ripping angle is
variable, and the depth is adjustable in three stages by a hydraulically controlled pin puller.
●The multi-shank ripper is a hydraulically controlled parallelogram ripper with three shanks.
Photo may include optional equipment
D275A-5
CRAWLER DOZER
P RODUCTIVITY
F EATURES
P RODUCTIVITY
F EATURES
Engine
The Komatsu SDA6D140E engine delivers 306 kW 410 HP at
2000 rpm. The fuel-efficient Komatsu engine, together with
the heavy machine weight, make the D275A-5 a superior
crawler dozer in both ripping and dozing production. The
engine is designed to surpass EPA/CARB Tier II, EU and
Japan regulations, and features direct fuel injection,
turbocharger, and aftercooler to maximize fuel efficiency.
To minimize noise and vibration, the engine is mounted
to the main frame with rubber cushions.
Hydrostatic Driven Engine Cooling Fan
Fan rotation is automatically controlled depending on coolant
and hydraulic oil temperature, saving fuel consumption and
providing great productivity with a quiet operating environment.
K-Bogie System
New K-Bogie Undercarriage System retains prior advantages,
with new additional features.
Current features:
●Effective length of track on ground is consistent. Shoe
slippage is minimized; therefore, high traction is obtained.
●The idler does not oscillate under load, providing excellent
machine balance. Blade and ripper penetration force
remains stable for increased productivity.
New features on K-Bogie Undercarriage System:
●K-bogies oscillate with two fulcrums, and track roller
vertical travel is greatly increased. Impact loading on all
undercarriage components has been reduced and
durability of components is improved since track rollers are
always in contact with track link.
●Undercarriage life is improved due to better control of
track chain alignment with track rollers.
●Riding comfort is improved by reducing vibration
and shock when traveling over rough terrain.
Fulcrum of major bogie
Fulcrum of minor bogie
67
Undercarriage
Radiator
Fan drive
hydraulic
motor
Controller
Power train oil
temperature
sensor
Coolant
temperature
sensor
Hydraulic
pump

8
Operator comfort is essential for safe and productive work.
The D275A-5 provides a quiet, comfortable environment
where the operator can concentrate on the work at hand.
Hexagonal Pressurized Cab (optional)
●The cab’s new hexagonal design and large tinted glass
windows provide excellent front, side, and rear visibility.
●Air filters and a higher internal air pressure combine
to prevent dust from entering the cab.
Comfortable Ride with New Cab Damper Mounting
and K-Bogie Undercarriage
D275A-5’s cab mount uses a newly designed cab damper
which provides excellent shock and vibration absorption
capacity with its long stroke. Cab damper mounts
combined with new K-bogie undercarriage, softens shocks
and vibration while traveling over adverse conditions, that
are impossible to absorb with conventional cab mounting
methods. The soft spring of cab damper isolates the cab
from machine body, suppressing vibration and providing a
quiet, comfortable operating environment.
New suspension seat
D275A-5 uses a newly designed suspension seat. Fore and
aft sliding rails
and suspension spring
have been newly
designed to increase
strength and rigidity,
reducing movement of
seat components. The
new seat provides
excellent support,
improving riding
comfort. Fore and aft
seat travel has been
designed for all
operator sizes.
Operator Comfort
W ORKING
E NVIRONMENT
W ORKING
E NVIRONMENT
Photo may include optional equipment
9
D275A-5
CRAWLER DOZER
E ASY
M AINTENANCE
E ASY
M AINTENANCE
Centralized Service Station
To assure convenient maintenance, the power train oil filter,
power train oil level gauges and hydraulic tank are arranged
on the right side of the machine.
Monitor With Self-Diagnostic Function
With the starting switch turned ON, the monitor displays P
on the display, check-before-starting and caution items
appear on the right lower part of the panel. The monitor
finds abnormalities, corresponding warning light blinks and
a warning buzzer sounds. The monitor displays engine rpm
and forward/reverse gear speed on the upper part of the
monitor during operation. When abnormalities occur during
operation, user code and service meter are displayed
alternately. When a high importance user code is displayed,
the caution light blinks and a warning buzzer sounds to
prevent the development of serious problems.
Enclosed Hydraulic Piping
Hydraulic piping for the blade tilt cylinder is completely
housed in the push arm, ensuring damage protection from
materials.
Modular Power Train Design
Power train components are sealed in a modular design that
allows the components to be dismounted and mounted
without oil spillage.
Oil Pressure Checking
Ports
Pressure checking ports for
power train components are
centralized to promote quick
and simple diagnosis.
Maintenance Free Disc Brakes
Wet disc brakes require less maintenance.
Enlarged Engine Room
Engine room space is enlarged by increasing engine hood
height, facilitating maintenance of the engine and related
equipment.
Gull-wing Engine Side Covers (optional)
The opening area is further enlarged when gull-wing engine
side covers are opened, facilitating engine maintenance and
filter replacement. Side covers have been changed to a thick
one-piece structure with a bolt-on catch to improve durability.
Preventative Maintenance
Preventative maintenance is the only way to ensure long service life from your equipment. That’s why Komatsu designed the
D275A-5 with conveniently located maintenance points to make necessary inspections and maintenance quick and easy.
Low Maintenance Costs
New Track Link Design
New D275A-5 track links feature increased link tread and link height and track
guiding guard shape is improved. The result is improved undercarriage life
and reduced cost through maintenance man-hours when turning pins and
bushings.
Wide link tread
Track
guiding
guard
High link height
All warning and monitor lights are lit for photo shooting.
SpringSilicon oil
Rubber Boot
Cab Damper Mounting

Extreme Additional Ground Ground
service shoes weight contact area pressure
710 mm 570 kg 49416 cm2102 kPa
1.04 kg/cm2
28" 1,260 lb 7,659 in214.8 psi
760 mm 850 kg 52,896 cm296 kPa
0.98 kg/cm2
30" 1,870 lb 9,642 in213.9 psi
11
D275A-5
CRAWLER DOZER
S PECIFICATIONS
S PECIFICATIONS
Gear Forward Reverse
1st 3.8 km/h 2.4 mph 4.9 km/h 3.0 mph
2nd 6.7 km/h 4.2 mph 8.7 km/h 5.4 mph
3rd 11.2 km/h 7.0 mph 14.9 km/h 9.3 mph
Drawbar Pull
Travel Speed
US ton kN ton
60
50
40
30
20
10
0024681012km/h
mph76
5
4
3
2
10
0
100
200
20
300
400
500
60
50
40
30
10
0
F1
F2
F3
C
D
A
B
EG
I
J
H
F
Overall Maximum Maximum Maximum Weight
length with Blade Blade lift above drop below tilt Dozer Hydraulic Ground
dozer capacity length x height ground ground adjustment equipment oil pressure*
Semi-U tilt 6930 mm 13.7 m34300 mm x 1960 mm 1450 mm 640 mm 1000 mm 7478 kg 29 kg 118 kPa
dozer 22'9" 17.9 yd314'1" x 6'5" 4'9" 2'1" 3'3" 16,490 lb 64 lb 1.20 kgf/cm2 17.1 psi
U tilt dozer 7265 mm 16.6 m34615 mm x 1973 mm 1450 mm 640 mm 1070 mm 8404 kg 29 kg 120 kPa
23'10" 21.7 yd315'2" x 6'6" 4'9" 2'1" 3'6" 18,530 lb 64 lb 1.22 kgf/cm217.3 psi
Dual tilt 6930 mm 13.7 m34300 mm x 1960 mm 1450 mm 640 mm 1140 mm 7555 kg 35 kg 118 kPa
Semi-U dozer 22'9" 17.9 yd314'1" x 6'5" 4'9" 2'1" 3'9" 16,660 lb 77 lb 1.20 kgf/cm217.1 psi
Dual tilt 7265 mm 16.6 m34615 mm x 1973 mm 1450 mm 640 mm 1220 mm 8481 kg 35 kg 118kPa
U-dozer 23'10" 21.7 yd315'2" x 6'6" 4'9" 2'1" 4'0" 18,700 lb 77 lb 1.22 kgf/cm217.3 psi
Blade capacities are based on the SAE recommended practice J1265.
* Ground pressure shows tractor, cab, ROPS canopy operator, giant ripper standard equipment and applicable blade.
SEMI-U DOZER WITH GIANT RIPPER
Tractor weight . . . . . . . . . . . . . . . . . . . . . . . . . . . 37680 kg 83,070 lb
Including rated capacity of lubricant, coolant, full fuel tank,
operator, and standard equipment.
Operating weight. . . . . . . . . . . . . . . . . . . . . . . . 49850 kg 109,900 lb
Including Semi-U tilt dozer, giant ripper, steel cab,
ROPS, operator, standard equipment, rated capacity of
lubricant, coolant, and full fuel tank.
Closed-center load sensing system (CLSS) designed for precise and
responsive control, and for efficient simultaneous operation.
Hydraulic control units:
All spool valves externally mounted beside the hydraulic tank.
Plunger type hydraulic pump with capacity (discharge flow) of 230 ltr
60.8 U.S. gal/min at rated engine rpm.
Relief valve setting . . . . . . . . . . . . . 27.5 MPa 280 kg/cm23,980 psi
Control valves:
Spool control valves for Semi-U tilt dozer and Full-U tilt dozer
Positions: Blade lift . . . . . . . . . . . . . . Raise, hold, lower, and float
Blade tilt. . . . . . . . . . . . . . . . . . . . . Right, hold, and left
Additional control valve required for variable digging angle multi-
shank ripper and giant ripper.
Positions: Ripper lift . . . . . . . . . . . . . . . . . . Raise, hold, and lower
Ripper tilt. . . . . . . . . . . . . Increase, hold, and decrease
Hydraulic cylinders . . . . . . . . . . . . . . . . . . . . . . Double-acting, piston
Hydraulic oil capacity (refill):
Semi-U tilt dozer . . . . . . . . . . . . . . . . . . . . . 130 ltr 34.3 U.S. gal
U tilt dozer . . . . . . . . . . . . . . . . . . . . . . . . . 130 ltr 34.3 U.S. gal
Ripper equipment (additional volume):
Giant ripper. . . . . . . . . . . . . . . . . . . . . . . . . . 38 ltr 10.0 U.S. gal
Multi-shank ripper . . . . . . . . . . . . . . . . . . . . 38 ltr 10.0 U.S. gal
Number of cylinders Bore
Blade lift 2 120 mm 4.72"
Blade tilt 1 180 mm 7.09"
Ripper lift 2 180 mm 7.09"
Ripper tilt 2 160 mm 6.30"
A2260 mm 7'5"
B4300 mm 14'1"
C3965 mm 13'0"
D1960 mm 6'5"
E3480 mm 11'5"
F9290 mm 30'6"
G3060 mm 10'0"
H1420 mm 4'8"
I1195 mm 3'11"
J3985 mm 13'1"
Ground Clearance: 507 mm 1'8"
10
COOLANT AND LUBRICANT
CAPACITY (REFILL)
Fuel tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 840 ltr 222 U.S. gal
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 ltr 34.3 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.0 ltr 13.7 U.S. gal
Torque converter, transmission,
bevel gear, and steering system . . . . . . . . . . 90 ltr 23.8 U.S. gal
Final drive (each side). . . . . . . . . . . . . . . . . . . . 40 ltr 10.6 U.S. gal
D275A-5
Power Shift
DRAWBAR PULL vs. SPEED
MAXIMUM USABLE PULL
DEPENDS ON TRACTION AND
WEIGHT OF TRACTOR
INCLUDING MOUNTED
EQUIPMENT
FINAL DRIVES
Double-reduction final drive of spur and planetary gear sets to
increase tractive effort and reduce gear tooth stresses for long final
drive life. Segmented sprocket rims are bolt-on for easy replacement.
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SDA6D140E
Type . . . . . . . . . . . . . . . . . . . . 4-stroke, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . Turbocharged, aftercooled
No. of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore x stroke . . . . . . . . . . . . . . . . . 140 mm x 165 mm 5.51" x 6.50"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . 15.24 ltr 930 in3
Flywheel horsepower
SAE J1349. . . . . . . . . . . . . . . . . . . . 306 kW 410 HP at 2000 rpm
DIN 6270 . . . . . . . . . . . . . . . . . . . . . 306 kW 416 PS at 2000 rpm
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All-speed, electronic
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . . Gear pump, force lubrication
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow
TORQFLOW TRANSMISSION
Komatsu TORQFLOW transmission consists of a water-cooled,
3-element, 1-stage, 1-phase, torque converter and a planetary gear,
multiple-disc clutch transmission which is hydraulically-actuated and
force-lubricated for optimum heat dissipation. Gearshift lock lever and
neutral safety switch prevent accidental starts.
STEERING SYSTEM
PCCS lever controls for all directional movements. Pushing the
PCCS lever forward results in forward machine travel, while pulling it
rearward reverses the machine. Simply tilt the PCCS lever to left to
make a left turn.
PCCS lever, joystick controlled wet multiple-disc steering clutches,
hydraulically loaded and hydraulically released. Wet multiple-disc,
pedal/lever controlled steering brakes are spring loaded hydraulically
released and require no adjustment. Steering clutches and brakes
are interconnected for easy, responsive steering.
Minimum turning radius . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 m 12'10"
UNDERCARRIAGE
Suspension . . . . . . . . . . . . . Oscillating equalizer bar and pivot shaft
Track roller frame. . . . . . . . . . . . . . . Cylindrical, high-tensile-strength
steel construction
Rollers and idlers. . . . . . . . . . . . . . . . . . . . . . Lubricated track rollers
K-bogie Undercarriage
Lubricated track rollers are resiliently mounted to the roller
frame with a series of K-bogies whose oscillating motion
is cushioned by rubber pads.
Extreme Service Track shoes
Lubricated tracks. Unique seals prevent entry of foreign
abrasive material into pin to bushing clearances to provide
extended service life. Track tension is easily adjusted with grease
gun.
No. of shoes (each side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Grouser height:
Single grouser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 mm 3.5"
Shoe width (standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 610 mm 24"
Ground contact area . . . . . . . . . . . . . . . . . . . . . 42456 cm26,580 in2
Ground pressure (bulldozer) . . . . . . . . 118 kPa 1.20 kg/cm217.1 psi
No. of track rollers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
No. of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DIMENSIONS
OPERATING WEIGHT
HYDRAULIC SYSTEM
DOZER EQUIPMENT