● Alternator, 60 ampere/24 V
● Back-up alarm
● Batteries, 170 Ah/2 x 12 V
● Blower fan
● Decelerator pedal
● Dry-type air cleaner with dust evacuator
and dust indicator
● Fast fuel fill
● 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)
● Lockup torque converter
● Muffler with rain cap
● Radiator reserve tank
● ROPS brackets
● Segmented sprockets
● Seven-roller track frames
● Shoes, 610 mm 24" extreme service,
single-grouser
● Suspension seat, chemical leather
● Palm lever steering control
● Starting motors, 2 x 7.5 kW/24 V
● TORQFLOW transmissions
● Tr ack roller guards
● Warning horn
● Wet steering clutches
STANDARD EQUIPMENT
OPTIONAL EQUIPMENT
● Air conditioner with heater and defroster
● Alternator, 75 ampere/24 V
● Alternator, 90 ampere/24 V
● Batteries, 200 Ah/2 x 12 V
● Car stereo
● Counterweight
● Cushion dozer
● Cushion push block
● Dual tilt dozer
● Fan, reversible
● Fire extinguisher
● Hitch
● Hydraulics for ripper
● Light for ripper point
● Mirror, rearview
● Panel cover
● Perforated side covers
—ø10 ø0.39" perforated holes
—ø4 ø0.16" perforated holes
● Perforated single radiator mask
● Pusher plate
● Radiator core protection grid
● Seat belt
● Shoes:
—710 mm 28"
—810 mm 32"
● Spill guard for Semi-U dozer
● Spill guard for U dozer
● Strengthened Semi-U blade
● Strengthened U blade
● Sun visor
● Suspension seat
—Fabric seat
—Fabric seat, high backrest
● Tr ack shoe slip control system
● Vandalism protection kit
ROPS canopy*:
Weight . . . . . . . . . . . . . . . . 760 kg 1,680 lb
Roof dimensions:
Length . . . . . . . . . . . . . . . 1405 mm 4'7"
Width . . . . . . . . . . . . . . . . 2035 mm 6'8"
Height from
compartment floor . . . . . . . 1867 mm 6'2"
Additional ground
pressure . . . 1 kPa 0.01 kgf/cm20.14 psi
*Meets ISO 3471 and SAE J1040 APR88, ROPS
standards, as well as ISO 3449 FOPS standard.
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 kPa 0.01 kgf/cm20.14 psi
Multi-shank ripper (optional):
Hydraulically controlled parallelogram ripper
with three shanks. Ripping angle available,
stepless adjustable.
Weight (including hydraulic
control unit) . . . . . . . .6720 kg 14,810 lb
Beam length . . . . . . . . . . . . .2854 mm 9'4"
Maximum lift above ground . .1050 mm 3'5"
Maximum digging depth . . . .1075 mm 3'6"
Additional ground
pressure . .14 kPa 0.14 kgf/cm21.99 psi
Variable giant ripper (optional):
Var iable, 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) .................5470 kg 12,060 lb
Beam length...........................1367 mm 4'6"
Maximum lift above ground....1060 mm 3'6"
Maximum digging depth.........1435 mm 4'8"
Additional ground
pressure.....12 kPa 0.12 kgf/cm21.71 psi
www.Komatsu.com Printed in Japan 200903 IP. AD (05)
CEN00232-01 Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan
NET HORSEPOWER
391 kW 525 HP
OPERATING WEIGHT
66985 kg 147,680 lb
Photo may include optional equipment.
D375A-5
C
RAWLER
D
OZER
D
375A
ECMV (Electronic Controlled
Modulation Valve)
Controlled Steering
Clutch/Brake System
facilitates steering operation.
See page 5.
2 3
D375A-5 Crawler Dozer
W
ALK
-A
ROUND
W
ALK
-A
ROUND
Simple hull frame and monocoque track frame
with pivot shaft for greater reliability.
D375A-5
CRAWLER DOZER
Extra-low Machine Profile provides excellent
machine balance and low center of gravity.
Large Blade Capacities:
18.5 m324.2 yd3(Semi-U dozer) and
22.0 m328.8 yd3(U dozer)
Preventative Maintenance
● Centralized Service Station
● Enclosed Hydraulic Piping
● Modular Power Train Design
● Oil Pressure Checking Ports
See page 9.
Photo may include optional equipment.
The Dual Tilt Dozer (option)
increases productivity while
reducing operator effort.
See page 8.
Automatic lockup
torque
converter saves fuel and
increases speed and power
transmission efficiency on
long pushes.
See page 7.
New Track Link Design reduces maintenance
cost by making turning pins easier, with improved pin
reuse.
See page 9.
391 kW 525 HP turbocharged,
aftercooled engine provides
plenty of power.
K-Bogie Undercarriage
System improves traction,
component durability, and
operator comfort.
See page 7.
Rippers (option):
● Variable giant
● Multi-shank
See page 8.
New Hexagonal Designed Cab includes:
● Spacious interior
● Comfortable ride with new cab damper mounting
and K-bogie undercarriage
● Excellent visibility
● High capacity air conditioning system (optional)
● PCCS (Palm Command Control System) lever
● Pressurized cab (optional)
● Adjustable left armrest
● Travel control console integrated with operator seat
Track shoe slip control system (option)
reduces operator fatigue.
See page 8.
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.
Low-drive, long-track, seven roller undercarriage
ensures outstanding grading ability and stability.
NET HORSEPOWER
391 kW 525 HP @ 1800 rpm
OPERATING WEIGHT
66985 kg 147,680 lb
BLADE CAPACITY
Semi-U: 18.5 m324.2 yd
3
Full-U: 22.0 m328.8 yd
3
Human-Machine Interface
Palm Command
Electronic Controlled
Travel Control Joystick
Ergonomically designed 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.
Fully Adjustable
Suspension Seat and
Travel Control Console
For improved rear visibility
during return part of cycle, the operator can adjust the seat
15° to the right. The transmission and steering controls
move with the seat for best operator comfort. The travel
control console also has adjustments fore and aft and for
height. With an independently adjustable armrest, each
D375A operator can adjust control positions to his individual
preference, providing optimum operational posture for
all operators.
Fuel Control Dial
Engine revolution is controlled by electric signals, providing
ease of operation and reducing problems caused by linkage
joint seizure.
Palm Command PPC Controlled
Blade Control Joystick
Blade control joystick uses the PPC (Proportional Pressure
Control) valve and the same palm command type joystick as
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 a thumb.This is available when
installing optional dual tilt dozer.)
Height Adjustable Blade Control Armrest
Blade control armrest is height adjustable without any tools
in three stages, providing the operator with firm arm support
and ideal armrest positioning.
Position Adjustable Ripper Control Lever
Ripper control lever is position adjustable, providing optimum
operation posture for all operators during ripping operations
facing front or watching ripper point.
5
D375A-5
CRAWLER DOZER
4
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”.
Power Train Electronic Control System
Smooth and Soft Operation
D375A-5 uses a newly designed power train electronic control system.The controller registers the amount of operator control
(movements of lever and operation of switches) and machine condition signals from each sensor, and calculates to accurately
control torque converter, transmission, steering clutches and brakes for optimized machine operation.The ease of operation
and productivity of the new D375A-5 is greatly improved by numerous new functions.
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
shockless smooth clutch engagement, improved component reliability,
expansion of component life and operator riding 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.
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 such as F1-R2, F2-R2 and manual shift. When F1-R2 or F2-R2 preset pattern is selected, and
travel control joystick moves to forward/rearward direction, the machine travels forward/rearward with F1-R2 or F2-R2 speed
automatically. This function reduces operating hours and operator’s gear shifting time during repeated round-trip operations.
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.
Auto-shift Down Function
Controller monitors engine speed, travel gear, and travel
speed. When load is applied and machine travel speed is
reduced, the controller automatically shifts down to optimum
gear speed to provide high fuel efficiency. This function
provides comfortable operation without manual downshift
and high productivity. (This function can be cancelled with
cancel switch.)
Heavy Load Light Load
Actuated on Heavy Load
or Steep Slope
Effect of ECMV Steering Clutches/Brake Control
Facing Front
When Turned 15°
Left-hand Joystick
Blade and Ripper
Control Joystick
Outline of Electronic Control System
Electronic Controlled
Modulation Valve (ECMV)
Conventional modulation valve
Clutch pressure
Time
Tra ve l
control
Auto shift
down switch
Deceleration
pedal
Engine controller
Water
temp.
Fuel control
valve unit
Engine
Engine oil
pressure
Switch
Monitor panel
F1-R2 F2-R2
MONITOR SYSTEM
Engine
speed
Fuel temp.
Lockup
Torq ue converter
lever
Transmission
controller
Transmission control
Torque converter control
Implement control
Tra nsmission
control valve
ECMV
Electronic controlled
transmission
Blade
control
lever
Steering controller
ECMV
ECMV
ECMV
ECMV
Fuel
control
dial
Auxilliary
valve
Tra ns mission
output
Electronic controlled
speed
steering/brake system
sensor
Ripper
control
lever
ECMV
ECMV
ECMV
ECMV
Pitch
angle
sensor
Acceleration
sensor
Brake pedal
potentio meter
Indicator
F1-R2
UP
MANUAL MODE (F1-R1)
Press DOWN switch
Press UP switch
F1-R2 MODE
DOWN
Press DOWN switch
F2-R2 MODE
Press UP switch
F2-R2
Large Blade
Capacities of 18.5 m324.2 yd3(Semi-U dozer) and 22.0 m328.8 yd3(U dozer) yield outstanding production. High-tensilestrength steel comprising the front and sides of the blade increases 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, hauling, and dumping 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 up 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.
Track Shoe Slip Control System (option)
● Eliminates the need for the operator to constantly control engine power output with the decelerator
while ripping. Operator fatigue is substantially reduced.
● Maneuverability is improved because the operator is free to focus on the ripping application without
having to monitor the track shoe slippage.
● Repair costs are significantly lowered and undercarriage life is prolonged with the reduction in track
shoe slippage.
● The track shoe slip control system will contribute to lower fuel costs, because the engine output is
automatically controlled to optimum levels for operation.
7
Track Shoe
Slip Control
Panel
P
RODUCTIVITY
F
EATURES
P
RODUCTIVITY
F
EATURES
Engine
The Komatsu SA6D170E-3 engine delivers 391 kW 525 HP
at 1800 rpm. The fuel-efficient Komatsu engine, together
with the heavy machine weight, make the D375A-5 a superior
crawler dozer in both ripping and dozing production. The
engine features direct fuel injection, a turbocharger, and an
aftercooler to maximize fuel efficiency.
To minimize noise and vibration, the engine is mounted
to the main frame with rubber cushions.
Automatic Torque Converter Lockup System
For greater efficiency during long pushes, the lockup
mode allows the system to automatically engage the torque
converter lockup clutch. Locking up the torque converter
transmits all the engine power directly to the transmission,
increasing ground speed thus achieving efficiencies equal
to a direct drive. The result is efficient use of engine power,
less fuel consumption, and faster cycle times.
K-Bogie Undercarriage System
New K-Bogie Undercarriage System combines prior
advantages with new additional features.
Current features:
● Effective length of track on ground is consistent. Shoe
slippage is minimized, resulting in higher traction.
● 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
to undercarriage components is reduced and component
durability 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.
D375A-5
CRAWLER DOZER
6
Engine
Torque
converter
Lockup “OFF”
Lockup “ON”
Transmission
Fulcrum of major bogie
Fulcrum of minor bogie
D375A-5
CRAWLER DOZER
E
ASY
M
AINTENANCE
E
ASY
M
AINTENANCE
Preventative Maintenance
Preventative maintenance is the only way to ensure long service life from your equipment.That’s why Komatsu designed the
D375A-5 with conveniently located maintenance points to make necessary inspections and maintenance quick and easy.
Centralized Service Station
To ensure convenient maintenance, the transmission
and torque converter oil filters are both arranged next to
the power train oil level gauge.
Monitor with Self-Diagnostic Function
Starting switch turned ON, the monitor displays P on the
upper part of the display, service meter on the lower part of
the display and Check-before-starting and caution items
appear on the right part of the liquid crystal panel. The
monitor finds abnormalities, corresponding warning lamp
blinks and warning buzzer sounds. The monitor displays
engine rpm and forward/reverse gear speed on the upper
part of the display during operation. When error occurs
during operation, user code and service meter are displayed
alternately. When a high importance user code is displayed,
a caution lamp blinks and 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 protecting it from damage.
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, making servicing work clean, smooth,
and easy.
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. Solid engine hood prevents dust
and rain from entering and keeps the engine clean.
Gull-wing Engine Side Covers
Gull-wing engine side covers facilitate engine maintenance
and replacement of each filter. Side covers are a thick
one-piece structure with bolt-on latch to improve durability and
repairability.
9
Mode for operator
When error occurred
When normally operated
Engine tachometer
Forward/reverse,
speed display
Service meter
User code
Displayed alternately
Low Maintenance Costs
Track Link with Wedge Ring
New D375A-5 track links feature reduced press-fit force and
a wedge ring. Conventional track pins are retained only with
a large press-fit force. The new track link divides pin forces
between the wedge ring and press-fit force.This results in
easier service with reduced pin damage when turning pins
and bushings. The result is improved undercarriage life and
reduced maintenance cost through reduced wear, greater pin
reusability, and reduced maintenance man-hours.
8
Operator Comfort
Operator comfort is essential for safe and productive work. The D375A-5
provides the operator with a quiet, comfortable environment where he can
concentrate on the work at hand.
Hexagonal Pressurized Cab
● 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
D375A-5’s cab mount uses a newly designed cab damper
mounting which further improves viscous damper and
provides excellent shock and vibration absorption capacity
with its long stroke. The cab damper mounting, combined
with new K-bogie undercarriage, softens shocks and
vibrations while traveling over ripped ground that are
impossible to absorb with conventional cab mounting
methods. The soft spring cab damper isolates the cab
from machine body, suppressing vibrations and providing
a quiet, comfortable operating environment.
New Suspension Seat
D375A-5 uses a newly designed suspension seat. Fore
and aft sliding rails and suspension spring are newly designed,
increasing strength and rigidity and reducing play of joints.
New seat provides excellent support and riding comfort. Fore and aft sliding amount is
designed to fit all operators.
Fresh Air Intake from Rear of Engine Hood
The air conditioner air intake port is now located at the rear of the engine hood where
there is minimal dust. As a result, the air inside the cab is always clean. Cleaning interval
of the filter is greatly extended, and use of a new structure filter element facilitates
cleaning and replacement.
W
ORKING
E
NVIRONMENT
W
ORKING
E
NVIRONMENT
Cab Damper Mounting
Photo may include optional equipment.
Photo may include optional equipment.
Rubber Boot
Rubber
Silicon Oil
Spring
When normally operated
Engine tachometer
Service meter
Mode for operator
Forward/reverse,
speed display
h
When error occurred
h
Displayed alternately
User code
Track
guiding
guard
Pin press fitting
force +
wedge ring
holding force
Wedge ring
11
D375A-5
CRAWLER DOZER
DOZER EQUIPMENT
Blade capacities are based on the SAE recommended practice J1265.
*Ground pressure shows tractor with cab, ROPS, giant ripper, standard equipment and applicable blade.
DIMENSIONS
SEMI-U DOZER WITH GIANT RIPPER
OPERATING WEIGHT
Tr actor weight. . . . . . . . . . . . . . . . . . . . . . . . . . 49800 kg 109,790 lb
Including rated capacity of lubricant, coolant, full fuel tank,
operator, and standard equipment.
Operating weight. . . . . . . . . . . . . . . . . . . . . . . . 66985 kg 147,680 lb
Including Semi-U tilt dozer, giant ripper, cab,
ROPS, operator, standard equipment, rated capacity of
lubricant, coolant, and full fuel tank.
Ground pressure. . . . . . . . . . . . . . . . . 140 kPa 1.43 kg/cm220.3 psi
HYDRAULIC SYSTEM
Hydraulic control unit:
Maximum flow. . . . . . . . . . . . . . . . . . . . 405 ltr/min 107 U.S. gal/min
Relief valve setting . . . . . . . . . . . . . 20.6 MPa 210 kg/cm22,990 psi
● All-spool control valves are externally mounted on the
hydraulic tank.
● Hydraulic gear pump.
Control valves:
● Tw o control valves for semi-U tilt dozer and U dozer
Positions: Blade lift . . . . . . . . . . . . . . Raise, hold, lower, and float
Blade tilt. . . . . . . . . . . . . . . . . . . . . Right, hold, and left
● Additional control valve required for ripper
Positions: Ripper lift . . . . . . . . . . . . . . . . . . Raise, hold, and lower
Ripper tilt
(digging angle). . . . . . . Increase, hold, and decrease
Hydraulic cylinders . . . . . . . . . . . . . . . . . . . . Double-acting, piston
Hydraulic oil capacity (refill):
Semi-U dozer or U dozer . . . . . . . . . . . . . . 120 ltr 31.7 U.S. gal
Ripper equipment (additional volume):
Giant ripper. . . . . . . . . . . . . . . . . . . . . . . . . . 70 ltr 18.5 U.S. gal
Multi-shank ripper (variable) . . . . . . . . . . . . . 70 ltr 18.5 U.S. gal
Multi-shank ripper (fixed). . . . . . . . . . . . . . . . 44 ltr 11.6 U.S. gal
Number of cylinders Bore
Blade lift 2 150 mm 5.9"
Blade tilt 1 225 mm 8.9"
Ripper lift 2 225 mm 8.9"
Ripper tilt 2 200 mm 7.9"
A 2500 mm 8'2"
B 4695 mm 15'5"
C 4035 mm 13'3"
D 2265 mm 7'5"
E 3840 mm 12'7"
F 10330 mm 33'11"
G 3450 mm 11'4"
H 1435 mm 4'8"
I 1060 mm 3'6"
J 4230 mm 13'11"
Ground Clearance: 610 mm 2'0"
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*
140 kPa
Semi-U 7635 mm 18.5 m
3
4695 mm x 2265 mm 1660 mm 715 mm 1065 mm 10490 kg 50 kg
1.43 kgf/cm
2
dozer 25'1" 24.2 yd
3
15'5" x 7'5" 5'5" 2'4" 3'6" 23,130 lb 110 lb
20.3 psi
143 kPa
U dozer 8000 mm 22.0 m
3
5140 mm x 2265 mm 1660 mm 715 mm 1165 mm 11740 kg 50 kg
1.46 kgf/cm
2
26'3" 28.8 yd
3
16'10" x 7'5" 5'5" 2'4" 3'10" 25,880 lb 110 lb
20.8 psi
141 kPa
Dual tilt 7635 mm 18.5 m
3
4695 mm x 2265 mm 1660 mm 715 mm 1150 mm 10860 kg 60 kg
1.44 kgf/cm
2
Semi-U dozer 25'1" 24.2 yd
3
15'5" x 7'5" 5'5" 2'4" 3'9" 23,940 lb 130 lb
20.5 psi
143 kPa
Dual tilt 8000 mm 22.0 m
3
5140 mm x 2265 mm 1660 mm 715 mm 1260 mm 12110 kg 60 kg
1.46 kgf/cm
2
U dozer 26'3" 28.8 yd
3
16'10" x 7'5" 5'5" 2'4" 4'2" 26,700 lb 130 lb
20.8 psi
S
PECIFICATIONS
S
PECIFICATIONS
10
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SA6D170E-3
Type . . . . . . . . . . . . . . . . . . . . 4-stroke, water-cooled, direct injection
Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . Turbocharged, aftercooled
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore x stroke . . . . . . . . . . . . . . . . . 170 mm x 170 mm 6.69" x 6.69"
Piston displacement . . . . . . . . . . . . . . . . . . . . . . . 23.15 ltr 1,413 in
3
Flywheel horsepower
SAE J1349 . . . . . . . . . . . . . . . . . . . 391 kW 525 HP @ 1800 rpm
DIN 6270 . . . . . . . . . . . . . . . . . . . . . 391 kW 532 PS @ 1800 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 with lockup clutch
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.
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.
STEERING SYSTEM
PCCS lever, joystick controlled, wet multiple-disc steering clutches
are spring-loaded and hydraulically released. Wet multiple-disc,
pedal/lever controlled steering brakes are spring-actuated
hydraulically released and require no adjustment. Steering clutches
and brakes are interconnected for easy, responsive steering.
Minimum turning radius. . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 m 13'9"
UNDERCARRIAGE
Suspension . . . . . . . . . . . . . Oscillating equalizer bar and pivot shaft
Tr ack 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 track
frame with a bogie suspension system whose oscillating motion
is cushioned by rubber pads.
Extreme Service Track Shoes
Lubricated tracks. Unique seals prevent entry of foreign
abrasives into pin to bushing clearances to provide extended
service life. Track tension is easily adjusted with grease gun.
Number of shoes (each side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Grouser height:
Single grouser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 mm 3.7"
Shoe width (standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 610 mm 24"
Ground contact area . . . . . . . . . . . . . . . . . . . . . 46850 cm27,262 in
2
Ground pressure (bulldozer) . . . . . . . . 140 kPa 1.43 kg/cm220.3 psi
Number of track rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Number of carrier rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
COOLANT AND LUBRICANT
CAPACITY (REFILL)
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . .1050 ltr 277 U.S. gal
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165 ltr 43.6 U.S. gal
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55.5 ltr 14.7 U.S. gal
Torque converter, transmission,
bevel gear, and steering system . . . . . . . . .150 ltr 39.6 U.S. gal
Final drive (each side) . . . . . . . . . . . . . . . . . . . .65 ltr 17.1 U.S. gal
Gear Forward Reverse
1st 3.8 km/h 2.4 mph 5.1 km/h 3.2 mph
2nd 6.8 km/h 4.2 mph 9.2 km/h 5.7 mph
3rd 11.8 km/h 7.3 mph 15.8 km/h 9.8 mph
012345 67 8 mph
250
x 10
3
lb x 103 kg
0
50
100
150
200
DRAWBAR PULL
TRAVEL SPEED
F3 (LOCK UP)
F1 (LOCK UP)
F2 (LOCK UP)
02468 km10 12
0
10
20
30
40
50
60
70
80
90
100
110
F3 (T/C)
F2 (T/C)
F1 (T/C)
Extreme Additional Ground Ground
service shoes weight contact area pressure
710 mm 660 kg 54530 cm
2
123 kPa
1.25 kgf/cm
2
28" 1,455 lb 8,452 in
2
17.8 psi
810 mm 1330 kg 62210 cm
2
108 kPa
1.10 kgf/cm
2
32" 2,932 lb 9,643 in
2
15.6 psi
D375A-5
Power Shift
DRAWBAR PULL VS. SPEED
MAXIMUM USABLE PULL
DEPENDS ON TRACTION AND
WEIGHT OF TRACTOR
INCLUDING MOUNTED
EQUIPMENT
C
D
J
A
B
E
F
G
I
H
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