D155AX-5 Bulldozers
Chapter 1 : Introduction
D155AX-5 m/c Feature
Environment
Low Fuel Consumption SA6D140 + Common Rail Increased torque converter efficiency (Improvement of the vane) Reduced P/L pump loss ( 80+100 50+32+71 cc/rev ) Optimized HSS pump size ( 104.571cc/rev ) Lowered fan revolution rate (1,2961,200rpm) Reduce Noise Level ( at environmental ) Hydrostatic driven engine cooling fan, ( 3dB )
Easy Maintenance
New monitoring panel Indicating unified claim codes and Indicating changing intervals for filters Easy Cleaning Cores with Hydraulic driven Fan
Operator Comfort
New wide operator's cab for medium sized bulldozers (Common for D65 thru D155) Palm Command Control System Low noise (Noise level at the operators ear) ( 5dB) Improved riding characteristics (Cab damper mount) Large capacity air conditioner Improved pressurization
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Others
Electronic control system
Transmission pre-setting function Automatic shift-down
KOMTRAX Step 2 (Option)
PRODUCT CONCEPT
Important points in this minor change
Low fuel consumption
Maintaining the "SA6D140 + Common Rail" feature Increased torque converter efficiency (Improvement of the vane) Reduced P/L pump loss Optimized HSS pump size Lowered fan revolution rate (1,296 1,200rpm) More parts compatible with other machine models (Operator's cab, floor, control levers, air conditioner, etc.)
Fuel efficiency exceeds that of the D8R Series II by 3%.
Others
Concept unification with neighboring models
Environment
Low noise (Environmental noise) Adoption of a hydraulic drive fan, etc. (
3dB)
Riding characteristics
New wide operator's cab for medium sized bulldozers (Common for D65 thru D155) Adoption of a new steering method (PCCS control) Low noise (Noise level at the operator's ear) ( 5dB) Improved riding characteristics (Cab damper mount) Large capacity air conditioner Improved pressurization New monitoring panel Indicating unified claim codes and indicating changing intervals for filters Improved cooling circuit cleaning capacity using a hydraulic drive fan Electronic control Transmission pre-setting function Automatic shift-down KOMTRAX Step 2 (Option)
Serviceability
Basic performance
D155AX-5 Introduction
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Product Line Comparison
D65EX-15 142(190)
D6R-2 138(185 ) 179(240)
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Main Structure Comparison
Engine
SA6D140E-3
D155AX-5 B
SA6D140E-3
D155AX-5 A
D3406E-TA
D8R
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COMPARATIVE SPECIFICATIONS
Item
COMPARATIVE SPECIFICATIONS
Manufacturer Model
D155AX-5 (New) 332(248)/1900 310(231)/1900 SA6D140E-3 38800(85,540) 8.8(11.5) 3210(10'6") 2100(6'11") * T/C+T/M+HSS 1,05 77 77.0 98
KOMATSU D155AX-5 (Current) 338(252)/1900 310(231)/1900 SA6D140E-3 37800(83,330) 8.8(11.5) 3210(10'6") 2100(6'11") * T/C+T/M+HSS 1,05 82 79.5 98 VISCOUS MOUNT
CATERPILLAR D8R-II 338(252)/2000 310(231)/2000 D3406E-TA 37875(83,500) 8.7(11) 3206(10'6") 2082(6'10") * T/C+T/M+D/S 1.0 79 81.5 D8R: Not measured yet / D8N:100 RUBBER MOUNT
ENGINE
FLYWHEEL HORSEPOWER ISO 9249 / SAE J1349 Gross Net HP(KW)/rpm HP(KW)/rpm kg(lb) m3(yd3) mm(ft.in) mm(ft.in) m3/h dB(A) dB(A) VL(dB) h
MODEL OPERATING WEIGHT BLADE CAPACITY(SAE) LENGTH OF TRACK ON GROUND TRACK GAUGE POWER LINE RIPPING AND DOZING PRODUCTION NOISE LEVEL AT OPERATOR'S EARS AMBIENT NOISE LEVEL AT 15m (16.4yd)
VIBRATION LEVEL, INDEPENDENT TRANEL (F3/R3)
Riding characteristics
MOUNT METHOD FAN DRIVE METHOD OPERATOR'S CAB
CAB DAMPER MOUNT HYDRAULIC (VARIABLE) MEDIUN SIZE WIDE CAB PCCS ELECTRIC STD STD 500
BELT (DIRECT)
BXX CAB SMALL SIZE FULL MONO LEVER (ELECTRIC / MECHANICAL)
BELT (DIRECT)
MONO LEVER (ELECTRIC / HYDRAULIC) STD STD 250
Driving TRAVEL CONTROL LEVER and operability PRESET TRAVEL SPEED/AUTO-SHIFT DOWN FANCTION
Serviceability MONITOR WITH TROUBLE SHOOTING FUNCTION 0&0 COST ENGINE OIL AND FILTER CHANGING INTERVALS
NOT EQUIPPED
STD 500
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D155AX-5 Introduction
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Dimension of D155AX-5B
Units: mm
3955
2695
3500 SemiU:8.8m3
1720 925 560 (710)
( 5.9m3)
D155AX-5 Introduction
3210 4865 8155
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2510
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Under carriage ( STD )
Under carriage ( OPT )
Full roller guard Introduction
D155AX-5
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HSS (Hydrostatic Steering System) No 1
The Hydrostatic Steering system (HSS) is powered by an independent hydraulic pump with engine power transmitted to both tracks without power interruption. When the machine turns,the outside track moves faster and inside slower. Clutch & Brake Clutch & Brake model turn by deactivating the clutch on one side.
Effective applications
1. Dozing while turning: As fast as dozing in a straight line. 2. Leveling: Leaves minimum tracks on soft ground. 3. Side cutting: Easy to hold a straight line. 4. Work on steep slopes: Machine moves in direction that lever is pushed.
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HSS (Hydrostatic Steering System) No 2
HSS and Cl & Br Comparison HSS Pivot turn Not possible Counter rotation Possible
Cl & Br Possible Not possible
Smooth
Rough
HSS
Cl&Br
HSS System
Steering signal
Engine controller
Work equipment pressure signal
Engine HSS pump
Servo valve
PCCS Lever
T/M,S/C Controller
N
Forward Reverse signal
Work equipment pump
Work equipment control valve
F/D
HSS motor
Steering press : A Steering press : B
D155AX-5 Introduction
Sprocket
HSS closed circuit
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REDUCED NOISE WITH A HYDRAULIC DRIVE FAN
Model Item Noise level at operator's ears Ambient noise level at 15 m (16.4yd) dB(A)
KOMATSU D155AX-5(New) D155AX-5(Current) 77 82 77.0 79.5
CAT D8R-II 79 81.5
Fan Speed
Noise reduction
Fan Control System
Radiator
Current m/n Engine Speed
Motor
Engine Water Temp.
Pump
Controller
Oil Temp.
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D155AX-5B
FAN CONTROL MAP Fan speed (rpm)
1200 1000 800 600
Water temp' : 95 C P/L Oil temp' : 108 C Hyd Oil temp' : 95 C
D155AX-5A
Fan speed (rpm)
1200
D155AX-5A
1295/1900 rpm 1200/1300 rpm
1200 rpm 1000 D155AX-5B
800 600
D155AX-5B
642 rpm
400 200 0 20 40 60 80 100 120 400
481 rpm
200 0
600 800 1000 1200 1400 1600 1800 2000 2200
Oil ,Water temperature ( C) P/L oil temp 108/125
700 rpm
1300 rpm
Engine speed ( rpm )
The advantage of the hydraulic driven fan
1. Reduced loss of horse power (When ambient temperature is low)
2. Reversing of fan can be easily done (easier to clean radiator) 3. Serviceability is improved (No need to change fan belt)
The reason for rectification grid becoming unnecessary in dusty area
Distribution of wind velocity
Crosscurrent (Turbulence)
D155AX-5A Fan
Rectification grid
Hydraulic driven Fan
D155AX-5B
Suction
Crosscurrent (Turbulence)
Rectified flow
Rectified flow
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Rectified flow
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Radiator
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Rectification grid
10 mm
Example
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FAN SELECTOR SWITCH
D155AX-5A Current Fan speed
1295rpm850
1200rpm1060 D155AX-5B
Water temp' : 95 C P/L Oil temp' : 481rpm 108 C Water or P/L oil temp'
For cold weather condition (The fan rotates in reverse.) When cleaning the radiator fins, reverse the rotation of the fan and change the direction of the air flow, Set the fan selector switch to the CLN position and start the engine. The fan rotates at 100 rpm speed in reverse and cleans the fins.
The fan selector switch cannot be operated when the engine is running
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If dirt is caught in the radiator fins, blow with compressed air or steam to clean. Page 17
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Reversible radiator fan
The fan selector switch cannot be operated when the engine is running
Oil cooler
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Cab Concept with Palm Command Control System
Palm Command Steering & Transmission Control Lever
Electronic Monitor with Self-Diagnostic Function
Electronic Throttle Dial
Blade Lever
Ripper Lever Swivels with Seat
Arm Rest
Operator Seat
PCCS (Palm Command Control System)
Preset Travel Speed Selection Function Three preset patterns: F1-R1, F1-R2, F2-R2 Moving joystick forward/rearward selects speed automatically Reduces cycle time & fatigue
Auto-shift Down Function Controller monitors engine speed, travel gear, travel speed When load applied & speed reduced, automatically shifts down to optimum gear speed to achieve more effective fuel consumption Comfortable operation and highly efficient production
The auto-shift down function does not work when the brake pedal is used.
AUTO SHIFT DOWN SYSTEM
[ Example ]
NO SHIFT UP FUNCTION
F1 F2
F2 (R2)
F1 (R1)
F2 F1
NO SHIFT UP FUNCTION R1 R2
R1 R2
ON
Auto shift down switch
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D155AX-5B DRAWBAR PULL
POWER PERFORMANCE CURVE
0.8W
TORQUE CONVERTER RANGE
0.7W
F1
EXAMPLE
0.6W
DRAWBER PULL (Ton)
0.5W
AUTO SHIFT DOWN
0.4W
F2
0.3W
AUTO SHIFT DOWN
0.2W
F3
0.1W
Ps =
12
Km/H
FxV
270
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TRAVEL SPEED (Km/H) Page 22
