771D Quarry Truck

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Oil-Cooled, Rear Disc BrakesRear braking lets the operator concentrate on the haul road.21Brakes.1 Parking/Secondary Piston2 Service/Retarding Piston3 Friction Discs4 Steel Plates5 Actuating Springs6 Cooling Oil In7 Cooling Oil Out37456Multiple Disc Brakes. Caterpillar forcedoil-cooled, multiple disc brakes arecontinuously cooled for exceptional,fade-resistant braking and retarding.The optional ARC and TCS utilize theoil-cooled rear brakes to enhance truckperformance and increase productivity.Oil Cooled Disc Brakes. Are designedand built for reliable, adjustment-freeoperation providing superiorperformance and service life incomparison to shoe-type and dry-discsystems.Oil Film. An oil film prevents directcontact between the discs. Absorbingthe braking forces by shearing oil andcarrying heat away, this design extendsbrake life.Secondary Braking. Spring applied,hydraulically released, oil-cooled discbrakes are located on the rear axle.The front brakes will activate as partof the secondary system, even ifswitched out of service.Parking Brakes. Spring applied,hydraulically released parking brakesuse wet disc brakes in service system.A toggle switch activates theparking brakes.Pistons. A Caterpillar patented, twopistondesign combines the service,secondary and parking brakes, alongwith retarding functions.The primary piston hydraulicallyactuates both service and retardingfunctions. The secondary piston isspring-applied and held in thedisengaged position by hydraulicpressure. If hydraulic system pressuredrops below a certain level, the springappliedsecondary piston automaticallyapplies the brakes.8
Integrated Braking Control (IBC)Electronically combines Automatic Retarding Control (ARC) and the Traction ControlSystem (TCS) into one integrated control system.ARC Operating Efficiency AdvantagesEngine Speed (rpm)*01020 30 40 50 60Time (Seconds)Automatic Retarder Control(Maintains Engine rpm between 2160-2300)Manual Retarder Control(Wide Variation in Engine rpm)* Optimum Engine rpmCat Retarding System. When retarding,the engine runs against compression ondownhill hauls, resulting in no fuel burn.Retarding forces and heat are absorbedthrough the oil. The retarding systemgenerates lower drive line stresses thandrive line retarding systems.70Automatic Retarder Control (Optional).The ARC electronically controls brakingon grade to maintain approximately2230 engine rpm (engine rpm isadjustable from 2160-2300 rpmin increments of 10 rpm). ARC isdeactivated when the operator appliesthe brakes or throttle.Engine Overspeed Protection. With theaccelerator depressed and/or ARCturned off, ARC will automaticallyactivate at 2475 rpm to help avoidpotentially destructive and often costlyengine overspeeds.ARC Benefits.■ Increased operating efficiency withfaster downhill speeds. Bymaintaining consistently higherengine speeds, average truck speedwill be higher than a manuallycontrolled truck.■ Excellent controllability and reducedoperator effort. Automatic brakemodulation provides a smoother rideover manual modulation, allowingthe operator to focus more on truckoperation down the haul road.■ Improved component life, optimizedsystem cooling capability andreduced torque fluctuations resultfrom ARC’s precision.■ Faster troubleshooting and diagnosiswith self-diagnostic capability andthe ability to communicate with ETthrough the Cat Data Link System.■ Operator awareness throughelectronic integration and CEMS,alerting the operator to overspeedconditions and critical machinefunctions.Traction Control System (Optional).Monitors wheel slip so if it exceedsthe set limit, the oil-cooled disc brakesare automatically applied to slow thespinning wheel.Operator Awareness. An on-dashindicator shows the operator that TCSis engaged.Differential Action. Utilizes normaldifferential action to provide superiormaneuvering in poor underfootconditions. Also reduces tire scuffing ascompared to positive lock differentialsused on other systems.Torque. TCS divides torque equallyto reduce stress created on final drivesand axles when torque is transferredto one side.System Back-up. Should sensors fail,the normal differential action is stillavailable to maintain control andsteering.9
Page 1 and 2: 771DQuarry Truck®Cat ® 3408E Engi
Page 3 and 4: Oil-Cooled, Rear Disc BrakesCaterpi
Page 5 and 6: Electronic Control Module (ECM).The
Page 7: Engine/Power Train IntegrationCombi
Page 11 and 12: Truck Body - Flat FloorCaterpillar
Page 13 and 14: 771D Operator Station. Rated highly
Page 15 and 16: Ground Level Battery DisconnectSwit
Page 17 and 18: EngineBrakesBody HoistsCat 3408EGro
Page 19 and 20: DimensionsAll dimensions are approx
Page 21 and 22: 3. From the intersection of the gro
Page 23 and 24: Standard EquipmentStandard and opti

771D Quarry Truck

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