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Features :- Komatsu Motor Graders
- GD825A-2
The GD825A Motor Grader – fulfilling Komatsu’s commitment to deliver top performance, unsurpassed reliability, and sound economics.
Superior stability and productivity come from the well balanced front-to-rear weight distribution.
Frame - Durable, welded steel plate, box-sectioned front and rear frames are designed for long life in tough working conditions.
Blade Rotation - Fast blade rotating speed facilitates quick blade angle changes for exceptional productivity. A long shoulder reach and hydraulic blade control match the GD825A to the most demanding applications. And the operator can position the blade cutting angle at up to 90º left or right, without leaving the cab.
Circle Slip Clutch - A standard circle slip clutch protects circle shoes and teeth from damage by allowing the blade to turn or “walk” over buried rocks or similar objects, reducing downtime and expense.
Circle Guide Shoes - Six adjustable circle guide shoes with brass inserts ensure precise blade operation, low shoe wear, and smooth blade rotation.
Engine - The Komatsu designed and built S6D140E diesel engine delivers a hefty 280 hp (209 kW).
Transmission - The Komatsu HYDROSHIFT® Transmission distributes the engine’s power over a wide range of speeds. Eight forward and reverse speeds match all job conditions from haul road grading to cleanup applications.
Differential - A heavy-duty differential is standard on the GD825A-2 to handle large loads.
Brakes - Wet, multiple-disc brakes, located on all tandem wheels, are oil-cooled and sealed from contamination to provide adjustment-free, long-lasting performance even when operating in muddy conditions.
Operator’s Compartment - Ergonomically designed operator’s compartment mounted to the rear frame maximizes performance and efficiency.
Display - The electronic display and monitoring system, located directly on the steering post for excellent visibility, continuously tracks the performance of all critical operating systems and alerts the operator in the event of a system malfunction before costly damage occurs.
Load Sensing System - The Closed-center Load Sensing System (CLSS) provides precise, responsive implement control at any engine rpm and reduces fuel consumption.
Ground Speed - A hand throttle plus foot throttle/heel decelerator and inching pedal provide the operator with smooth and precise control of ground speed.
Elevating Cab - Komatsu’s exclusive elevating cab not only provides a comfortable place to work, it simplifies maintenance and repair. By raising the cab 2'4" (710 mm), hydraulic piping and control linkage can be inspected – even on the job site – without disconnection.
Specifications :- Komatsu
Motor Graders
- GD825A-2
Engine
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Standard
make and model
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Komatsu
S6D140E
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Fuel
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Diesel
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Number
of cylinders
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6
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Operating
cycle
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4
stroke
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Flywheel
power* @ 2100 rpm
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280
HP
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209
kW
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*Flywheel
power:
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*Flywheel
power is the rated power at the engine flywheel minus the
average accessory losses. Accessories include fan and charging
alternator. Ratings represent gross engine performance in
accordance with SAE J1349 conditions.
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Transmission
The Komatsu HYDROSHIFT® Transmission utilizes planetary gears and hydraulically actuated, force-lubricated multiple-disc clutches. A single lever completes both speed shifting and direction changes. Inching pedal allows precise finishing operation and smooth machine starts. Eight forward and reverse speeds match all job requirements. Gearshift lock device prevents accidental machine starts. Engine starts only when the shift lever is set in the park position.
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Travel
speeds (at rated engine rpm):
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1st
Gear Forward
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2.5
mph
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4.0
km/h
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1st
Gear Reverse
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2.7
mph
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4.3
km/h
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2nd
Gear Forward
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3.4
mph
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5.4
km/h
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2nd
Gear Reverse
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3.6
mph
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5.8
km/h
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3rd
Gear Forward
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5.0
mph
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8.0
km/h
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3rd
Gear Reverse
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5.3
mph
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8.5
km/h
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4th
Gear Forward
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7.1
mph
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11.5
km/h
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4th
Gear Reverse
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7.6
mph
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12.2
km/h
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5th
Gear Forward
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9.8
mph
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15.8
km/h
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5th
Gear Reverse
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10.5
mph
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16.9
km/h
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6th
Gear Forward
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13.3
mph
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21.4
km/h
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6th
Gear Reverse
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14.2
mph
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22.8
km/h
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7th
Gear Forward
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19.5
mph
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31.3
km/h
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7th
Gear Reverse
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20.8
mph
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33.4
km/h
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8th
Gear Forward
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27.9
mph
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44.9
km/h
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8th
Gear Reverse
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29.8
mph
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47.9
km/h
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Maximum
drawbar pull
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31,790
lb
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14
420 kg
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Hydraulics
Hydraulic cylinders: Double-acting piston-type hydraulic cylinders, two for blade lifting, one for drawbar sideshifting, one for blade sideshifting, one for front wheel leaning, one for blade tipping, two for front wheel steering, and two for frame articulation. Pilot check valves ensure positive cylinder action (excluding a blade sideshift cylinder).
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Pumps:
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Steering/work
equipment (piston-type)
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73.4
U.S. gal
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278
ltr
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Transmission
(gear-type)
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35.1
U.S gal
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133
ltr
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Differential
(gear-type)
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4.5
U.S. gal
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17
ltr
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Motor:
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Piston-type
(for blade rotation)
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66
HP
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49
kW
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Relief
valve setting:
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Work
equipment
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3,560
psi
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250
kg/cm²
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Steering
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2,490
psi
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175
kg/cm²
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Transmission
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440
psi
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31
kg/cm²
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Steering
Full-hydraulic orbit-roll-type steering control system with two steering cylinders directly actuated on the knuckle arm.
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Steering
angle (maximum)
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50°
(front wheels, left and right)
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Frame
articulation angle
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25°
(left and right)
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Turning
radius (minimum)
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25'11''
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7.9
m (frame articulated)
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Standard Equipment :- Komatsu
Motor Graders
- GD825A-2
Engine and transmission:
• Diesel engine 280 HP 209 kW
• Starting motor, 24 V/11 kW
• Alternator 24 V/50 A
• Batteries 2 x 12 V/200 Ah
• Corrosion resistor
• Dry-type air cleaner with automatic dust ejector and precleaner
• Pusher-type fan
• Engine side covers
• Muffler
• Hand throttle
• Accelerator, decelerator, and inching pedals
• HYDROSHIFT® Transmission
• Lock/unlock differential
• Transmission underguard
Meters, gauges, and monitoring systems:
• Service meter
• Air pressure gauge
• Water temperature gauge
• Fuel gauge
• Dust indicator
• Blade bank pin retract indicator
• Electronic display monitoring system (for final drive oil temperature, engine oil pressure, coolant level, coolant temperature, air pressure, alternator charging, engine oil level, hydraulic oil level, engine preheating)
• Speedometer
Moldboard:
• Blade sideshift, hydraulic
• Blade tip control, hydraulic
• 16'2'' 4928 mm blade
• Cutting edges, two 8' 2438 mm
• Side edges, reversible
• End bits, overlay
• Circle drive slip clutch
Brakes:
• Oil-disc brakes for four rear wheels (foot-operated)
• Dry, disc-type parking brake (hand-operated)
Other Standard Equipment:
• Adjustable console and work equipment control levers
• 5-way adjustable seat
• Horn
• Backup alarm
• Stop and tail lamps
• Panel lamp
• Pilot check valves for blade lift, blade tipping, front wheel leaning, drawbar sideshift, and frame articulation cylinders
• Front working lights (4)
• Rear working lights (2)
• Rearview mirror
• Vandalism protection kit
• Blade accumulator
• Rear drawbar
• Headlights
• Back-up light
Optional Equipment :- Komatsu
Motor Graders
- GD825A-2
• 23.5 x 25-12 PR (L2) tires
• 18.00 x 25-12 PR (G3) tires
• Air conditioner with heater/defroster
• Heater and defrosters
• Push plate
• Blade extension 2' / 610 mm
• Float position blade control
• Auxiliary steering
• Window wiper, door, lower
• ROPS canopy, * full-height
• ROPS canopy, * low-profile
* ROPS canopy or ROPS cab must be ordered for all machines.
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