Komatsu HM250-2 User manual

www.Komatsu.com Printed in Japan 200902 IP.AD(10)
CEN00347-00 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
232 kW 311 HP
NET HORSEPOWER
222 kW 298 HP
MAXIMUM GVW
47680 kg 105,120 lb
Photo may include optional equipment.
ARTICULATED DUMP TRUCK
HM250-2
HM
250
STANDARD EQUIPMENT FOR BASE MACHINE
OPTIONAL EQUIPMENT
CAB:
●Power window (R.H)
●Radio, AM/FM
●Radio, AM/FM with cassette
BODY:
●Body exhaust heating kit
●Body liner
●Tail gate, wire type, overall width
2998 mm 9'10"
●Upper side extension, 200 mm 8"
LIGHTING SYSTEM:
●Back work lights, left and right side
●Fog lights
●Yellow beacon
TIRES:
●30/65 R25 (750/65 R25)
OTHER:
●Alternator, 75A/24V
●Automatic Retarder with Acceleration
Control (ARAC)
●Dump counter
●Fire extinguisher
●Gas charge tool
●KOMTRAX
●Rear view camera and monitor
●Spare parts for first service
●Tool kit
●Vandalism protection
ENGINE:
●Alternator, 50A/24V
●Batteries, 2 x 12V/136Ah
●Engine, Komatsu SAA6D125E-5
●Exhaust muffler
●Starting motor, 1 x 7.5 kW
CAB:
●Air conditioner
●Ashtray
●Cigarette lighter
●Cup holder
●Electronic maintenance
display/monitoring system
●Heated rear window
●Operator seat, reclining, air suspension
type with retractable 78 mm 3" width seat
belt
●Passenger seat with retractable seatbelt
●Power window (L.H)
●Space for lunch box
●Steering wheel, tilt and telescopic
●Sun visor, front window
●Tiltable ROPS cab with FOPS, sound
suppression type
●Two 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
●Transmission underguard
BODY:
●Electronic hoist control system
TIRES:
●23.5 R25
OTHER:
●Alarm, backup
●Anti-slip material on fenders
●Automatic supplementary steering
●Centralized greasing
●Coolant temperature alarm and light
●Electric circuit breaker, 24V
●Hand rails for platform
●Horn, electric
●Ladders, left and right hand side
●Limited slip differentials in all axles
●Mud guards
●Protective grille for rear window
●Rearview mirrors
●Side marker
●Steering joint locking assembly
●Under view mirrors

WALK-AROUND
HM250-2
ARTICULATED DUMP TRUCK
HM250-2 ARTICULATED DUMP TRUCK
Maintenance-free Oscillating Hitch
with Tapered Roller Bearings
means lower operating costs by
eliminating the need to lubricate the hitch.
See page 9.
3
Hydro-pneumatic Suspension
for all Terrains
The hydro-pneumatic suspension in both
front and rear suspensions assures a
comfortable ride even over rough terrain.
See page 7.
2
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.
See page 4.
Komatsu's Unique Trailing Arm
Suspension
Komatsu's unique trailing arm suspension employed
for the front wheels reduces shocks to provide
excellent ride quality.
See page 7.
Tiltable Cab
The cab can be tilted rearward to
provide easy service.
See page 9.
KOMTRAX equipped machines can send location, SMR and operation maps
to a secure website utilizing wireless technology Machines also relay error
codes, cautions maintenance items, fuel levels and much more.
(Optional)
Komatsu Designed, Electronically Controlled
Transmission for a Comfortable Ride
●F6-R2 counter-shaft type transmission with K-ATOMiCS
(Komatsu Advanced Transmission with Optimum Modulation
Control System)
●Transmission shift hold button optimizes the operator control.
See page 4.
Wide, Spacious Cab with
Excellent Visibility
●The wide cab offers a comfortable operator
and passenger environment
●Viscous mounts support the cab while
absorbing vibrations and noise
●Low-noise cab through improved sealing
with integrated floor
Interior noise level 76 dB(A)
●Additional front under view mirrors
provide superior visibility
●Air suspension seat is standard
●Power window (L.H) for operator’s
convenience
See page 6.
High Capacity, Reliable, Continuously
Cooled, Wet Type Multiple-disc Brakes and
Retarder
●Fully hydraulic controlled wet multiple-disc brake
●Retarder absorbing capacity (continuous descent)
296 kW 397 HP
See page 5.
Easy-to-Load Body
●Heaped capacity 14.7 m319.2 yd3
●Low loading height 2670 mm 8'9"
●High strength body constructed of thick wear-
resistant steel having 400 Brinell hardness
See page 5.
High Performance and
Environment-friendly
SAA6D125E-5 ecot3 Engine
●Gross horsepower 232 kW 311 HP
●North American EPA Tier 3 and
EU Stage 3A emission certified
●Engine power mode selection system
realizes both greater productivity and
improved fuel economy
●Higher engine output and torque improve
productivity
See page 4.
Fully Hydraulic Articulated Steering
●Light and easy operation
●Minimum turning radius 7.96 m 26'1"
●Tilt and telescoping steering column
See page 5.
The HM250-2 with ecot3 engine, is EPA Tier 3 and EU Stage 3A emission certified,
offers all around maximum productivity with faster travel speed and many features
that enhance efficiency, while reducing maintenance costs. From rough terrain
construction sites to landfills - the HM250-2 has the competitive edge.
GROSS HORSEPOWER
232 kW 311 HP @ 2000 rpm
NET HORSEPOWER
222 kW 298 HP @ 2000 rpm
MAXIMUM GVW
47680 kg 105,120 lb
Photo may include optional equipment.

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 productivity.
In addition, limited slip
differentials prevent the tires on
either side from slipping on soft
ground.
Hydraulically Controlled Wet Multiple-Disc Brakes
and Retarder
Wet multiple-disc brakes with proven performance in larger
articulated and rigid trucks are tailored for use in the HM250.
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):
296 kW 397 HP
Large Capacity Body and Box Section Frame
Structure
The 14.7 m319.2yd3heaped capacity body is among the
largest in its class. The low loading height of 2670 mm 8'9"
enables easy loading. The body is built of high strength
wear-resistant steel with a Brinell hardness of 400, and the
body shape provides excellent load stability and retains the
load. Rugged enough for the toughest jobs, the HM250’s
frame is designed using a rigid box structure with
connecting torque tubes made of high strength low alloy
steel.
Articulated Steering
Fully hydraulic articulated steering offers low-effort
operating performance and maneuverability. A minimum
turning radius of only 7.96 m 26’1” provides ability
to work in tight areas.
Komatsu Designed Electronically Controlled
Countershaft Transmission
The Komatsu designed Electronically Controlled Transmission
with K-ATOMiCS has been a success 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 and maximizes power train life.
5
HM250-1
ARTICULATED DUMP TRUCK
4
The combination of high horse power, high travel speeds and an efficient engine
with low emissions delivers maximum productivity at cost.
Komatsu Technology
Komatsu’s new "ecot3" engines are designed to deliver
optimum performance under the toughest of conditions,
while meeting the latest environmental regulations. This
engine is Tier 3 EPA, EU Stage 3A and Japan emissions
certified. "ecot3" - ecology and economy combined with
Komatsu technology to create a high performance engine
without sacrificing power or productivity.
High Performance SAA6D125E-5 Komatsu Engine
The Komatsu engine delivers faster acceleration and higher
travel speeds with high horsepower per ton. Advanced
technology, such as Common Rail Injection system (CRI),
air-to-air aftercooler, and an efficient turbo-charger enables
the engine to be North American EPA Tier 3 and EU stage
3A emission certified. High torque at low speed, impressive
acceleration, and low fuel consumption ensures maximum
productivity.
Engine Power Mode Selection System
The system allows selection of the appropriate mode
between two modes <Power mode > or <Economy mode>
according to each working condition. The mode is easily
selected with a switch in the operator’s cab.
Power mode
Great productivity can be attained by taking full advantage
of high output power. It is appropriate for job sites where the
truck meets high resistance.
Economy mode
Engine speeds for the maximum horsepower output and the
downshift and upshift speeds are set to a lower level. This
mode is selected for maximum economy and lighter work
applications.
7.96 m 26'1"
4.01 m 13'2"
Hydro-Pneumatic Trailing Arm Suspension
Hydro-pneumatic suspension with proven performance in
larger articulated and rigid trucks is tailored for use in the
HM250. The front axle hydro-pneumatic suspension
employs a "De Dion" type design. The suspension is a
trailing arm design which allows the truck to ride smoothly
over bumps. The rear-axles are mounted on a dynamic
equalizer structure equipped with hydro-pneumatic
suspension. The entire vehicle’s hydro-pneumatic
suspension delivers a comfortable ride and maximizes
productivity.
PRODUCTIVITY FEATURES
HM250-2
ARTICULATED DUMP TRUCK
HM250-2 ARTICULATED DUMP TRUCK

OPERATOR ENVIRONMENT
HM250-2
ARTICULATED DUMP TRUCK
HM250-2 ARTICULATED DUMP TRUCK
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. This Komatsu
on-board monitoring system makes the machine very friendly
and easy to service.
Komatsu's Unique Trailing Arm Suspension
Komatsu's unique trailing arm suspension (with hydro-
pneumatic suspension) employed for the front wheels allows
the truck to ride smoothly and reduces pitching of the
machine to provide excellent ride quality.
Electric Body Dump Control Lever
The low effort lever makes dumping easy. A positioning
sensor is installed for dump body control witch significantly
reduces the shock made by the lowering of the dump body.
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.
Hydro-pneumatic Suspension for all Terrains
The hydro-pneumatic front and rear 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 noise level (76 dB(A)).
6
Low-noise Designed Cab
Integrated cab and floor provide airtight cab. Engine room is
also sealed. The low noise and sound insulated muffler
/exhaust pipe contribute to reducing sound levels.
All these together offer a quiet and comfortable operator
environment.
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 window
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.
The front under view mirrors are increased to three from one,
and the rear view mirrors increased to four from two.
Electric heated rear window facilitates defrosting.
Air Suspension Seat is Standard
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.
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
Trailing Arm

EASY MAINTENANCE
HM250-2
ARTICULATED DUMP TRUCK
HM250-2 ARTICULATED DUMP TRUCK
98
Tiltable Cab
The cab can be tilted rearward 32 degrees to provide easy
maintenance/service for the engine and transmission.
Note: An external hydraulic pump (optional) is required to tilt
the cab or a service crane can be used after easily
removing only eight bolts.
Extended Service Intervals
In order to minimize operating costs, service intervals
have been extended:
●Engine oil 500 hours
●Transmission oil 1000 hours
●Engine oil filter 500 hours
●Transmission oil filters 1000 hours
Remote Centralized Greasing
Many groups of concentrated grease fittings are located at
places where remote greasing can be performed at ground
level.
The HM250-2 has been designed to keep service time down and productivity up by
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.
Maintenance-free oscillating hitch with tapered roller
bearings means lower operating costs by eliminating the
need to lubricate the hitch.
Centralized Arrangement of Filters
Various filters are collectively arranged to facilitate daily
checks.
 
GENERAL FEATURES
Built-in ROPS /FOPS Cab
These strucures conform to ISO 3471 and SAE J1040-
1988C standards.
Laminated Glass
Laminated glass is used for the front windshield of the cab.
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
Independent 3 Brake Systems
Each of the front, rear and parking brake systems has its
own hydraulic control line and an accumulator.
Rear Frame Inclination Sensor
When the body is not seated in position, if the rear frame
rolls to the right or left exceeding the stability limit, the alarm
buzzer sounds and the caution lamp lights up to warn the
operator.
Under-view Mirror & Side Under-mirror
The machine is equipped with 3 under-view mirrors on the
front side and a side under mirror.
Tilt caution lamp
Taper roller bearingOil seal
Hitch Frame
Guards
The following guards are provided as standard:
●Protective grille for rear window
●Engine underguard
●Heavy duty transmission underguard
●Propeller shaft guards
●Exhaust thermal guard
●Body heating covers (optional)
Heating Covers
Heating Covers

1110
DIMENSIONS
10060 mm 33'0"
443 mm 1'5"
1525 mm
5'0"
4975 mm 16'4"
70°
4010 mm 13'2"
2280 mm 7'6"
3500 mm 11'6"
2900 mm 9'6"
24°
1710 mm
5'7"
7960 mm 26'1"
45°
2725 mm 8'11" 4100 mm 13'5"
6185 mm 20'4"
640 mm 2'1"
500 mm 1'8"
1200 mm 3'11"
2670 mm 8'9"
2900 mm 9'6"
2685 mm 8'10"
1600 mm 5'3"
F1
F2
F3
F4
F5
F6
706050403020100
0
3
5
6
7
8
9
10
20
30
40
50
2
1
4
35.0
40.0
45.0
30.0
25.0
20.0
15.0
14.0
13.0
12.0
11. 0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
100
60
80
40
30
20
10
5
4
3
2
0
RIMPULL
010152025303540
TRAVEL SPEED
MPH
km/h
LOADED
EMPTY
GROSS WEIGHT
x103lb
x103kg
x103lb x103kg
5
TOTAL RESISTANCE (GRADE + ROLLING) (%)
20 25 35 45 5030 40 55
50 60 70 80 90 110 120
010
0102030405060
20 30 40 50 60 70 80 90 100 km/h
MPH
TRAVEL SPEED
-10
-15
-20
-25
-30
-5
-35
-40
TOTAL RESISTANCE (GRADE + ROLLING) (%)
0
050100 150 200
10 20 30 40 50 60 70 80 90 100
-45-50
GROSS WEIGHT
x103lb
x103kg
LOADEDEMPTY
F1
F2
F3
F4
F5 F6
GRADE DISTANCE : CONTINUOUS DESCENT
TRAVEL PERFORMANCE BRAKE PERFORMANCE
HM250-2
ARTICULATED DUMP TRUCK
HM250-2 ARTICULATED DUMP TRUCK
SPECIFICATIONS
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
Transmission . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . 57.6 km/h 35.8 mph
ENGINE
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Komatsu SAA6D125E-5
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycle
Aspiration . . . . . . . . . . . . . Turbo-charged, after-cooled, cooled EGR
Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mm 4.92"
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mm 5.91"
Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . 11.04 ltr. 674 in3
Horsepower
SAE J1995 . . . . . . . . . . . . . . . . . . . . . . . . Gross 232 kW 311 HP
ISO 9249 / SAE J1349 . . . . . . . . . . . . . . . . . Net 222 kW 298 HP
Rated rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 rpm
Fan drive type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical
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 (cyclonpack 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
Connected by strong torque tubes
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 on front and center axles
Parking brake . . . . . . . . . . . . . . . . . . . Spring applied, caliper disc type
Retarder. . . . . . . . . . . . . . Front and center axle brakes act as retarder
WEIGHT (APPROXIMATE)
Empty weight. . . . . . . . . . . . . . . . . . . . . . . . . . 23,600 kg 52,030 lb
Gross vehicle weight . . . . . . . . . . . . . . . . . . . . 47,680 kg 105,120 lb
Weight distribution:
Empty: Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.6%
Center axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.8%
Rear axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.6%
Loaded: Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3%
Center axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4%
Rear axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3%
BODY
Capacity:
Struck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 m314.5 yd3
Heaped (2:1, SAE) . . . . . . . . . . . . . . . . . . . . . . . 14.7 m319.2 yd3
Payload . . . . . . . . . . . . . . . . . . . . . 24.0 metric tons 26.5 U.S. tons
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 kg/mm2184,925 psi
high tensile strength steel
Material thickness:
Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 mm 0.55"
Front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm 0.31"
Sides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm 0.47"
Target area
(inside length x width) . . . . . . . 4975 mm x 2685 mm 16'4" x 8'10"
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust heating (option)
HYDRAULIC SYSTEM
Hoist cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin, 1-stage type
Relief pressure . . . . . . . . . . . . . . . . . 20.6 MPa 210 kg/cm2 2,990 psi
Hoist time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 sec
CAB
Dimensions comply with ISO 3471 ROPS (Roll-Over Protective
Structure) standards
TIRES
Standard tire. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.5 R25
SERVICE REFILL CAPACITIES
Fuel tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . 384 ltr. 101.5 U.S. Gal
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ltr. 9.8 U.S. Gal
Torque converter, transmission and
retarder cooling . . . . . . . . . . . . . . . . . . . . . 77.5 ltr. 20.5 U.S. Gal
Differentials (total) . . . . . . . . . . . . . . . . . . . . . 63.5 ltr. 16.8 U.S. Gal
Final drives (total) . . . . . . . . . . . . . . . . . . . . . . . . 24 ltr. 6.3 U.S. Gal
Hydraulic system. . . . . . . . . . . . . . . . . . . . . . . 120 ltr. 31.7 U.S. Gal
Suspension (total) . . . . . . . . . . . . . . . . . . . . . . . 8.4 ltr. 2.2 U.S. Gal