•Thisshopmanualmaycontainattachmentsandoptionalequipmentthatarenotavailable inyourarea.PleaseconsultyourlocalKomatsudistributorforthoseitemsyoumay require.
Materialsandspecificationsaresubjecttochangewithoutnotice.
•WD900-3mounttheSA12V140-1engine.
Fordetailsoftheengine,seethe12V140SeriesEngineShopManual.
GENERALASSEMBLYDRAWING
SPECIFICATIONS
MachinemodelWD900-3
SerialNo.50001andup
Operatingweightkg100,000
Weight
Performance
Distribution(front)kg50,000
Distribution(rear)kg50,000
Bladecapacitym3 26.0
Travelspeed FORWARD1stkm/h7.0 FORWARD2ndkm/h12.3 FORWARD3rdkm/h28.0
REVERSE1stkm/h7.1
REVERSE2ndkm/h12.4
REVERSE3rdkm/h28.3
Max.rimpullkN{kg}686.5{70,000}
Gradeabilitydeg25
Min.turning radius Centerofoutsidewheelmm9,200 Outsideportionofblademm11,285
Overalllengthmm12,035
Overallwidthwithoutblademm4,585
Bladewidthmm6,470
Dimensions
Bladeheightmm2,160
Overallheight(topofROPScab)mm5,215
Wheelbasemm5,450 Treadmm3,350
Min.groundclearancemm480
MachinemodelWD900-3
SerialNo.50001andup
Engine ModelSA12V140-1
Type
Power train
4-cycle,water-cooled,Vtype, 12-cylinderdirectinjection, with2-turbocharger,after-cooler
No.ofcylinders-borexstrokemm12–140x165
Pistondisplacement l{cc}30.48{30,480}
FlywheelhorsepowerkW/rpm{HP/rpm}637/2,000{853/2,000}
MaximumtorqueNm/rpm{kgm/rpm}4,090/1,300{417/1,300}
Axle, wheel
Performance
Fuelconsumptionratiog/kWh{g/HPh}200{145}
Highidlingspeedrpm2,220
Lowidlingspeedrpm650/850
Startingmotor24V,7.5kWx2
Alternator24V,75A
Battery12V,200Ahx4
Torqueconverter3-element,1-stage,single-phase (TCA51-1A)
TransmissionPlanetarygear,multiple-disc, hydraulicallyactuated,modulationtype
ReductiongearSpiralbevelgear
DifferentialStraightbevelgear
FinaldrivePlanetarygear,singlereduction,oilbath
DrivetypeFront/rear-wheeldrive
FrontaxleFixed-frame,full-floating
RearaxleCenterpinsupporttype,full-floating
Tire45/65R45XLDD1(L-4)
Wheelrim36.00x45WTB
InflationpressurekPa{kg/cm2}667{6.80}
Mainbrake
Brakes
Front/rearwheelbraking, separatefront/rearwheel,wetdisc, hydraulicallyactuated
ParkingbrakeMountedonfrontaxleinputshaft,drydisc, hydraulicallyreleasespringapply
Steeringsystem
MachinemodelWD900-3
SerialNo.50001andup
TypeArticulatedtype
StructureFullyhydraulicallypowersteering
Torqueconverter,transmissionpump
Steeringpump
Switchpump
Hydraulic pumpdelivery
Hydraulic system
Control valve Set pressure
Cylinder
Workequipment
Additionaloilcooler fanpump
Frontbrakecoolingpump
Rearbrakecoolingpump
PPCpump
Brakepump
/min 421 (Geartype:SAR(4)112+SAR(3)100)
/min 307 (Fixedcapacitypistonpump:HPF76+71)
/min 405 (Fixedcapacitypistonpump:HPV95+95)
/min
(Geartype:SAR(1)025)
/min 67.8 (Geartype:SBL(1)24)
/min 67.8 (Geartype:SBR(1)24)
/min
(Geartype:SAR(1)032)
/min 29 (Geartype:SAR(1)014)
Workequipmentpump l/min 405 (Variablecapacitypistonpump:HPV90+90)
TransmissionvalveMPa{kg/cm2}
SteeringdemandvalveMPa{kg/cm2}
PPCvalveMPa{kg/cm2}
MaincontrolvalveMPa{kg/cm2}
SteeringcylinderNo.-borexstrokemm
LiftcylinderNo.-borexstrokemm
TiltcylinderNo.-borexstrokemm
2.5{25} (Spooltype,electriccontrol)
31.4{320} (Fullyhydraulictype)
3.7{38} (2-levertype)
31.4{320} (2-spooltype)
Reciprocatingpiston 1–160x503
Reciprocatingpiston 1–200x1,300
Reciprocatingpiston 2–225x240
BladetypeSemiU-blade
BladeframetypeOuterframe
WEIGHTTABLE
Thisweighttableisaguideforusewhentransportingorhandlingcomponents.
MachinemodelWD900-3
SerialNo.50001andup
Engine3,200 Radiator1,200
Torqueconverter590 Transmission2,300 Damper178
Upperdriveshaft68.5
Centerdriveshaft190
Frontdriveshaft180
Reardriveshaft190
Centersupport154
Frontaxle8,190
Rearaxle7,700
Frontdifferentialassembly1,226
Reardifferentialassembly1,256
Planetarycarrierassembly(each)238
Planetaryhubassembly(each)600
Axlepivot(Rearaxle)286
Wheel(each)845
Tire(each)2,130
Steeringdemandvalve58
Steeringcylinder(each)203
Hydraulictank823
Workequipmentpump167
Parkingbrakeassembly185
Torqueconvertercharging+PPC+brakepump49
Switchpump141
Switch+additionaloilcoolerfanpump151
Steeringpump141
Fenderandguardassembly1,393
PPCvalve5.5
Maincontrolvalve(each)95
DC·COvalve90
Liftcylinder(each)621
Tiltcylinder598
Fenderandladderassembly1,720
Unit:kg
SerialNo.50001andup
Enginehood88(Top) 28(Side)
Frontframe9,966
Rearframe9,855
Outerframe(L.H.)1,136
Outerframe(R.H.)1,148
Hlinkage1,408
Ylinkage1,338
Support(L.H.)1,909
Support(R.H.)1,913
Blade7,149
Counterweight2,900
Fueltank780
Battery(each)59 Cab430
Airconditionerunit55
Operator’sseat48
Floorplate348
ROPSsupportassembly1,387
Unit: