Page 1
www.Komatsu.com Printed in Japan 200812 IP.AD(05)
CEN00031-01 Materials and specifications are subject to change without notice
is a trademark of Komatsu Ltd. Japan
Standard equipment may vary for each country, and this specification sheet may contain attachments and optional equipment
that are not available in your area. Please consult your Komatsu distributor for detailed information.
GROSS HORSEPOWER
250 kW 335 HP
NET HORSEPOWER
242 kW 324 HP
MAXIMUM GVW
49,875 kg 109,960 lb
Photo may include optional equipment
A
RTICULATED
D
UMP
T
RUCK
HM300-1
HM
300
Page 2
Maintenance-free oscillating hitch
with tapered roller bearings
means lower operating costs by
eliminating the need to lubricate the hitch.
3
HM300-1
ARTICULATED DUMP TRUCK
Hydro-pneumatic Suspension
for all terrains.
The hydro-pneumatic suspension in both
front and rear suspensions assures a
comfortable ride even over rough terrain.
2
HM300-1 Articulated Dump Truck
W
ALK
-A
ROUND
W
ALK
-A
ROUND
Differential locks for excellent
traction in rough terrain. The oil-
cooled multiple-disc interaxle lock can be
turned on and off during travel. In addition,
the limited slip differentials prevent the tires
on either side from slipping on soft ground for
maximum traction.
Tiltable cab can be tilted rearward
to provide easy service.
Komatsu designed, electronically controlled
transmission for a comfortable ride.
F6-R2 counter-shaft type transmission with K-ATOMiCS
(Komatsu Advanced Transmission with Optimum Control
System).
Wide, spacious cab
● The wide cab offers a comfortable operator
environment
● Viscous mounts support the cab while
absorbing vibrations and noise
● Interior noise level 76 dB(A)
Reliable, continuously cooled, wet type
multiple-disc brake and retarder
● Fully hydraulic controlled wet multiple-disc brake
● Retarder Absorbing Capacity (continuous descent)
349 kW
468 HP
449 kW 602 HP (with optional exhaust retarder)
Easy-to-Load Body
● Heaped capacity 16.6 m321.7 yd
3
● Low loading height 2790 mm 9'2"
● Robust body constructed of thick wear-
resistant steel having 400 Brinell hardness
High performance and
environment-friendly
SAA6D125E-3 engine
● Gross horsepower 250 kW 335 HP
Fully hydraulic articulated steering
● Light and easy operation
● Minimum turning radius 7.96 m 26'1"
The HM300-1 offers all around maximum productivity with faster travel speed and
many features that enhance efficiency, while reducing maintenance costs. From
construction sites to landfill - the HM300-1 excels.
GROSS HORSEPOWER
250 kW 335 HP @ 2000 rpm
NET HORSEPOWER
242 kW 324 HP @ 2000 rpm
MAXIMUM GVW
49,875 kg 109,960 lb
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Komatsu Designed Differential
Locking Systems
The full-time six-wheel drive system
reduces slippage. A wet multiple-disk
interaxle clutch also locks the three axles
in unison for greater traction. The interaxle
lock can be switched on and off while the
truck is travelling, thereby boosting productiv-
ity. In addition, limited slip differentials pre-
vent the tires on either side from slipping on
soft ground.
Hydraulically Controlled Wet Multiple-Disc Brakes
and Retarder
Wet multiple-disc brakes have been proven on Komatsu
dump trucks and wheel loaders ensuring highly
reliable and stable brake performance. The large-capacity,
continuously cooled,wet-multiple disc brakes also function as
a highly responsive retarder which gives the operator greater
confidence at higher speeds when travelling downhill.
Retarder Absorbing Capacity (continuous descent):
349 kW
468 HP
449 kW 602 HP (with optional exhaust retarder)
Large Capacity Body and Box
Section Frame Structure
The 16.6 m321.7 yd3heaped capacity
is among the highest in its class. The
low loading height of 2790 mm
9'2"
enables easy loading. The body is built
of thick wear-resistant steel with a
Brinell hardness of 400, and the body
shape provides excellent load stability.
Rugged enough for the toughest jobs,
the HM300’s frame is designed using
a rigid box structure with high strength
low alloy steel.
Articulated Steering
Fully hydraulic articulated
steering offers low-effort
operating performance and
maneuverability. A mini-
mum turning radius of only
7.96 m
26'1” provides the free-
dom to move about in confined
areas.
Komatsu Designed Electronically Controlled
Countershaft Transmission
The Komatsu designed Electronically Controlled Transmission
called K-ATOMiCS has been successfully employed in
Komatsu’s rigid dump trucks. The electronic clutch modulation
system ensures proper clutch pressure when the clutch is
engaged. The total control system controls both the engine and
transmission by monitoring the vehicle conditions. This high
technology system assures smooth shifts without shock.
5
HM300-1
ARTICULATED DUMP TRUCK
4
The combination of high travel speeds and an efficient engine with low emissions
delivers maximum productivity at the lowest cost.
P
RODUCTIVITY
F
EATURES
P
RODUCTIVITY
F
EATURES
High Performance SAA6D125E-3 Komatsu Engine
This engine delivers faster acceleration and higher
travel speeds with the highest horsepower per ton in its
class. Advanced technology, such as Common Rail Injection
system (CRI), air to air aftercooler, and an efficient turbo-
charger enables the engine to suit low emission.
High torque at low speed, impressive acceleration, and low
fuel consumption ensures maximum productivity.
7.96 m 26'1"
Hydro-pneumatic Suspension
The hydro-pneumatic suspension has been proven on
Komatsu’s rigid dump trucks. The front axle hydro-pneumatic
suspension employs "De Dion" type design, allowing the
machine to ride more smoothly over
bumps. The rear-axles are mounted on a
dynamic equalizer structure equipped with
hydro-pneumatic suspension. The entire
vehicle’s suspension delivers a comfortable
ride and maximizes productivity.
Page 4
Built-in ROPS/FOPS
These structures conform to ISO 3471 and SAE J1040-1988C
standards.
Hydro-pneumatic Suspension for all Terrains
The hydro-pneumatic suspension assures a comfortable ride
even over rough terrain and ensures maximum productivity
and operator confidence.
Viscous Cab Mounts
Viscous mounts reduce the noise transmitted to the cab and
achieve a quiet 76 dB(A) noise level
Air Suspension Seat
The air suspension, fabric-covered seat which is adjustable
to the operator’s weight is provided as standard. The air
suspension seat dampens vibrations transmitted from the
machine and reduces operator fatigue as well as holding the
operator securely to assure confident operation.
Electric Body Dump Control Lever
The low effort lever makes dumping easier than ever.
Supplementary Steering and Secondary Brakes
Supplementary steering and secondary brakes are standard
features.
Steering: ISO 5010-1992, SAE J1511
Brakes: ISO 3450-1996, SAE J1473
HM300-1
ARTICULATED DUMP TRUCK
6
O
PERATOR
E
NVIRONMENT
O
PERATOR
E
NVIRONMENT
Wide, Spacious Cab with Excellent Visibility
The wide cab provides a comfortable space for the operator
and a full size buddy seat. Large electrically operated windows
and the operator’s seat positioned to the left side ensures
superior visibility.
Ergonomically Designed Cab
The ergonomically designed operator’s compartment makes
it very easy and comfortable for the operator to use all the
controls. The result is more confident operation by operators
and greater productivity.
Easy-to-See Instrument Panel
The instrument panel makes it easy to monitor critical
machine functions. In addition, a caution light warns the
operator of any problems that may occur. Problems are
recorded in the monitor and indicated as service codes.
This makes the machine very friendly and easy to service.
Steering Wheel and Pedals
Low effort pedals reduce operator fatigue when working
continuously for long periods. The tiltable, telescoping steering
column enables operators to maintain the optimum driving
position at all times.
Komatsu has developed a state-of-the-art, wide comfortable cab. The low level of
vibration and noise ensure maximum productivity from the operator.
7
Page 5
AXLES
Full time all wheel drive with limited slip differential in all axles.
Final drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Planetary gear
Ratios:
Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.154
Planetary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.667
TRANSMISSION
Torque converter . . . . . . . . . . . . . . . . . 3-elements, 1-stage, 2-phase
Tr ansmission . . . . . . . . . . . . . . . . . Full-automatic, counter-shaft type
Speed range . . . . . . . . . . . . . . . . . . 6 speeds forward and 2 reverse
Lockup clutch . . . . . . . . . . . . . . . . . . . . . . . . . Wet, single-disk clutch
Forward . . . . . . . . . . . . . . . . . . . . Torque converter drive in 1st gear,
direct drive in 1st lockup and all higher gears
Reverse. . . . . . . . . Torque converter drive and direct drive in all gear
Shift control . . . . . . . . . . . . . . . Electronic shift control with automatic
clutch modulation in all gear
Maximum travel speed . . . . . . . . . . . . . . . . . . 59.0 km/h 36.7 mph
S
PECIFICATIONS
S
PECIFICATIONS
WEIGHT (APPROXIMATE)
Empty weight . . . . . . . . . . . . . . . . . . . . . . . . . . 22500 kg 49,600 lb
Gross vehicle weight. . . . . . . . . . . . . . . . . . . . . 49875 kg 109,960 lb
Weight distribution:
Empty: Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56.8%
Center axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.2%
Rear axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.0%
Loaded: Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.8%
Center axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7%
Rear axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.5%
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D125E-3
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycle
Aspiration . . . . . . . . . . . . . . Turbo-charged and air-to-air after-cooled
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mm 4.92"
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mm 5.91"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . 11.04 ltr 674 in
3
Performance:
Gross horsepower . . . . . . . . . . . . . . . . . . . . . . . . 250 kW 335 HP
Flywheel horsepower . . . . . . . . . . . . . . . . . . . . . . 242 kW 324 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 rpm
Maximum torque . . . . . . . . . . . . . . . . . . . . . . . 160 kg•m 1,157 lb. ft
Fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct injection
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronically controlled
Lubrication system
Method . . . . . . . . . . . . . . . . . . . . . . . Gear pump, force-lubrication
Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow type
Air cleaner. . . . . . . . . . . . . . . . . . Dry type with double elements and
precleaner (cyclopack type), plus dust indicator
SUSPENSION SYSTEM
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hydro-pneumatic suspension
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Combined hydro-pneumatic
and rubber suspension system
MAIN FRAME
Type . . . . . . . . . . . . . . . . . . . . . . . . . Articulated type, box-sectioned
construction on front and rear
STEERING SYSTEM
Type . . . . . . . . . . . . . . . Articulated type, fully hydraulic power steering
with two double-acting cylinders
Supplementary steering . . . . . . . . . . . . . . . . . . Automatically actuated,
electrically powered
Minimum turning radius, wall to wall. . . . . . . . . . . . . . . . . 7.96 m 26'1"
Articulation angle . . . . . . . . . . . . . . . . . . . . . . . . . . . 45° each direction
BRAKES
Service brakes . . . . . . . . . . . . . . . . . . Full-hydraulic control, oil-cooled
multiple-disc type
Parking brake . . . . . . . . . . . . . . . . . . . Spring applied, caliper disc type
Retarder. . . . . . . . . . . . . . Front and center axle brakes act as retarder
BODY
Capacity:
Struck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.9 m316.9 yd
3
Heaped (2:1, SAE) . . . . . . . . . . . . . . . . . . . . . . . 16.6 m3 21.7 yd
3
Payload . . . . . . . . . . . . . . . . . . . . . . 27.3 metric tons 30.1 U.S. tons
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 kg/mm2 184,925 psi
high tensile strength steel
Material thickness:
Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 mm 0.63"
Front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm 0.31"
Sides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm 0.47"
Target area
(inside length x width) . . . . . . . 5240 mm x 2685 mm 17'2" x 8'10"
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust heating (option)
HYDRAULIC SYSTEM
Hoist cylinder . . . . . . . . . . . . . . . . . . . . Twin, 2-stage telescopic type
Relief pressure . . . . . . . . . . . . . . . . . 20.6 Mpa 210 kg/cm2 2,990 psi
Hoist time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 sec
CAB
Dimensions comply with ISO 3471 and SAE J1040-1988c ROPS
(Roll-Over Protective Structure) standards
TIRES
Standard tire. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.5 R25
SERVICE REFILL CAPACITIES
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382 ltr. 100.9 U.S. Gal
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ltr. 9.2 U.S. Gal
Torque converter, transmission and
retarder cooling. . . . . . . . . . . . . . . . . . . . . . 77.5 ltr. 20.5 U.S. Gal
Differentials (total) . . . . . . . . . . . . . . . . . . . . . . . . 50 ltr.13.2 U.S. Gal
Final drives (total). . . . . . . . . . . . . . . . . . . . . . . . . 27 ltr. 7.1 U.S. Gal
Hydraulic system . . . . . . . . . . . . . . . . . . . . . . . 120 ltr. 31.7 U.S. Gal
Suspension (total) . . . . . . . . . . . . . . . . . . . . . . . 10.4 ltr. 2.7 U.S. Gal
HM300-1
ARTICULATED DUMP TRUCK
9
8
Tiltable Cab
The cab can be tilted rearward to provide easy
maintenance/service for the engine and transmission.
Note: An external hydraulic pump is required to tilt the cab
or a service crane can be used after removing only
eight bolts...
E
ASY
M
AINTENANCE
E
ASY
M
AINTENANCE
The HM300-1 has been designed to keep service time down and productivity up by
having a maintenance-free oscillating hitch, a reduced number of grease points, easy
access to filters, and longer intervals between oil changes.
Fewer Grease Points
The number of grease points are minimized by using maintenance-free
rubber bushings and a maintenance-free oscillating hitch.
Taper roller bearingOil seal
Guards
The following guards are provided as standard:
● Protective grille for rear window
● Engine underguard
● Tr ansmission underguard
● Propeller shaft guards
● Exhaust thermal guard
● Fire prevention covers
Extended Service Intervals
In order to minimize operating costs, service intervals have been extended:
● Engine oil 500 hours
● Tr ansmission oil 1000 hours
● Engine and transmission filters 500 hours
Hitch Frame
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DIMENSIONS
HM300-1
ARTICULATED DUMP TRUCK
24
2280 mm 7'6"
1600 mm 5'3"
1200 mm
3'11"
1710 mm
5'7"
605 mm
2'0"
510 mm
1'8"
6445 mm 21'2"
2900 mm 9'6"
4100 mm 13'5"
580 mm 1'11"
2900 mm 9'6"
2590 mm 8'6"
10095 mm 33'1"
4965mm 16'3"
4010 mm
1
3'2
"
7960 mm 26'1"
2790 mm 9'2"
3500 mm 11'6"
45
70
2
3
.
5
R
2
5
2
3
.
5
R
2
5
2
3
.
5
R
2
5
1695 mm
5'7"
3
5
6
3
5
6
8
9
10
20
30
40
50
20
304050
35.0
45.0
25.0
20.0
15.0
14.0
13.0
8.0
6.0
4.0
3.0
2.0
g
50
60708090
100
110
130
TRAVEL PERFORMANCE
BRAKE PERFORMANCE
STANDARD EQUIPMENT FOR BASE MACHINE
OPTIONAL EQUIPMENT
1110
CAB:
● Air conditioner
● Radio, AM
● Radio, AM/FM
● Radio, AM/FM with cassette
BODY:
● Body liner
● Body exhaust heating kit
● Rock body
● Tail gate, wire type
● Upper side extension, 200 mm 8"
LIGHTING SYSTEM:
● Fog lights
● Back work lights, left and right side
● Yellow beacon
SAFETY:
● Additional retarder, engine exhaust
● Rear view camera and monitor
GAUGE:
● Engine oil filter warning alarm and light
ARRANGEMENT:
● Batteries for cold area arrangement
● Cold area arrangement (from –30°C
–22°F to –40°C –40°F)
● Poor fuel (contained water) arrangement
● Sandy and dusty area arrangement
OTHER:
● Alternator, 75A/24V
● Autogreasing system
● Fire extinguisher
● Gas charge tool
● Radiator shutter, canvas type
● Spare parts for first service
● Tool kit
● Vandalism protection
TIRES:
● 30/65 R25 (750/65 R25)
ENGINE:
● Alternator, 50A/24V
● Batteries, 2 x 12V/112Ah
● Engine, Komatsu SAA6D125E-3
● Exhaust muffler
● Starting motor, 1 x 7.5 kW
CAB:
● Ashtray
● Cigarette lighter
● Cup holder
● Electronic hoist control system
● Electronic maintenance display/monitor-
ing system
● Heater and defroster
● Operator seat, reclining, air suspension
type with retractable 78 mm 3" width seat
belt
● Passenger seat with retractable seat belt
● Power windows
● Space for lunch box
● Steering wheel, tilt and telescopic
● Sun visor, front window
● Tiltable ROPS cab with FOPS, sound
suppression type
● Tw o doors, left and right
LIGHTING SYSTEM:
● Back-up light
● Hazard lights
● Headlights with dimmer switch
● Indicator, stop and tail lights
GUARD AND COVERS:
● Engine underguard
● Exhaust/muffler thermal guard
● Fire prevention covers
● Propeller shaft guards, front and rear
● Tr ansmission underguard
SAFETY EQUIPMENT:
● Alarm, backup
● Anti-slip material on fenders
● Automatic supplementary steering
● Coolant temperature alarm and light
● Hand rails for platform
● Horn, electric
● Ladders, left and right hand side
● Protective grille for rear window
● Rearview mirrors
● Steering joint locking assembly
● Under view mirror
OTHER:
● Centralized greasing
● Limited slip differentials in all axles
● Electric circuit breaker, 24V
● Mud guards
● Side marker
BODY:
● Electronic hoist control system
TIRES:
● 23.5 R25
x 1000 k
F
F
F
GRADE DISTANCE: CONTINUOUS DESCENT
050100150 200
0
10 20 30 40 50 60 70 80 90 100
0102030405060
GROSS WEIGHT
EMPTY LOADED
WITHOUT EXHAUST
WITH EXHAUST(OPTION)
20 30 40 50 70 80 90 100 km/h
60010
TRAVEL SPEED
-40
-35
-30
-25
-20
-15
-10
-5
MPH
103 lb
103 kg
TOTAL RESISTANCE (GRADE + ROLLING) (%)
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