The 785D bare chassis comes equipped with a higher Tractor ROPS certification ratings needed for specialty machines including water trucks, tow trucks, and fuel and lube trucks.

Off-Highway Trucks Bare Chassis 785D Bare Chassis

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Key Specs

LRC Bare Chassis Weight without Hoist
177309 lb
80426 kg
Tractor ROPS
207234 lb
94000 kg
Nominal Water Tank Capacity
30000 gal (US)
113500 l


Customization to Work for Your Application.

Caterpillar offers partial machines and systems, working with Cat dealers and Original Equipment Manufacturers (OEMs) to provide specialty machines for specific applications. Bare chassis trucks (WTR models) can be ordered with or without hoist cylinders and most product options are identical to the dump truck models. Typically, these models come equipped with the higher Tractor ROPS certification ratings needed for specialty machines including water trucks, tow tractors, and fuel and lube trucks. These partial machine configurations are used in construction, demolition, waste, material, handling, quarry, and mining applications.

The Cat Water Delivery System (WDS) is available as an optional attachment with the 777 WTR, 785D WTR, and 789D WTR Off-Highway Truck Bare Chassis and includes factory installed controls in the cab, a hydraulic pump and motor, a water pump and stainless steel spray heads. Whether your goal is dust control or haul road maintenance, the Cat WDS is designed to put water to the ground in a controlled, intelligent way. The simple to operate automated system allows you to concentrate on more important safety issues like traffic, personnel, and road conditions. You'll also find that the Cat WDS not only improves safety, but also reduces truck maintenance costs, conserves water, and provides significant fuel savings to help your bottom line.

Product Specifications for 785D Bare Chassis

Engine Model Cat® 3512C HD Cat® 3512C HD
Rated Engine Speed 1750 r/min 1750 r/min
Gross Power - SAE J1995 1450 HP 1082 kW
Rated Net Power - SAE J1349 1348 HP 1005 kW
Bore 6.7 in 170 mm
Stroke 8.4 in 215 mm
Displacement 3573.6 in³ 58.56 l
Note Net Power advertised is the power available at the flywheel when the engine is equipped with air intake system, exhaust system, and alternator Net Power advertised is the power available at the flywheel when the engine is equipped with air intake system, exhaust system, and alternator
LRC Bare Chassis Weight without Hoist 177309 lb 80426 kg
LRC Bare Chassis Weight with Hoist 180827 lb 82022 kg
LRC Gross Vehicle Weight (Target) with Hoist 550000 lb 249476 kg
LRC Gross Vehicle Weight (Target) without Hoist 550000 lb 249476 kg
Nominal Water Tank Capacity 30000 gal (US) 113500 l
Tractor ROPS 207234 lb 94000 kg
Forward - 1 7.5 mile/h 12.1 km/h
Forward - 2 10.2 mile/h 16.3 km/h
Forward - 3 13.8 mile/h 22.2 km/h
Forward - 4 18.6 mile/h 29.9 km/h
Forward - 5 25.2 mile/h 40.6 km/h
Forward - 6 34 mile/h 54.8 km/h
Reverse 6.8 mile/h 11 km/h
Note Maximum travel speeds with standard 33.00-R51 tires. Maximum travel speeds with standard 33.00-R51 tires.
Brake Surface - Front 9497 in² 61270 cm²
Brake Surface - Rear 13908 in² 89729 cm²
Fuel Tank Capacity 500 gal (US) 1893 l
Cooling System 100 gal (US) 379 l
Crankcase 54 gal (US) 204 l
Differential - Final Drives 115 gal (US) 436 l
Steering System - Including Tank 31 gal (US) 641 l
Brake Hoist System 89 gal (US) 337 l
Brake/Hoist Hydraulic Tank 169 gal (US) 641 l
Torque Converter - Transmission System 65.51 gal (US) 248 l
Steering Standards ISO 5010:2007 ISO 5010:2007
Steer Angle 36 ° 36 °
Turning Diameter 97.7 ft 29.8 m
Turning Circle - Clearance Diameter 109 ft 33.2 m

785D Bare Chassis Standard Equipment

For bare chassis standard and optional equipment, please reference the 785D Off-Highway Truck. For more information on 785D WTR Bare Chassis options, please contact Caterpillar OEM Solutions at


  • Cat 3512C HD-EUI diesel engine: Air Cleaner with Precleaner (2) Engine, Engine Shutdown, Ether starting aid, Air to air aftercooler (ATAAC), Elevated low idle control, Auto starter protection, Multi-point oil pressure sensing, Antifreeze, extended life coolant -35° C (-30° F)
  • Braking System: Brake release motor (towing), Oil-cooled, Multiple-disc (front and rear), (service, retarding, parking, secondary), Automatic retarder control, Engine overspeed protection, Extended life brake disc
  • Transmission: 6-speed automatic powershift with electric control (TCC), Body-up shift inhibitor, Controlled throttle shifting, Directional shift management, Downshift/reverse shift inhibitor, Individual clutch modulation, Neutral coast inhibitor/start switch, Body-up reverse neutralizer, Programmable top gear, Lock-up torque convertor, Caterpillar flexible core radiator


  • 24V electrical system, low maintenance batteries (2) 93 amp-hour
  • Alarm, Back-up
  • Alternator, 105 ampere
  • Batteries, 12V (2), 93 amp/hour
  • Converter, 12V electrical
  • Electrical system, 24V, 15 amp
  • Lighting System, LED: Backup and hazard lights, Directional signals, front and rear, Headlights amd foglights, Lo-hi beam selector, Left-hand ladder/service deck, Stop/tail lights, Engine compartment, VIMS, blue light
  • Payload, indicator lights


  • Air Conditioner
  • Coat hook
  • Diagnostic connection port
  • Dome courtesy light
  • Entertainment radio ready: 5 amp converter, speakers, antenna, wiring harness
  • Gauges/Indicators: Air cleaner service indicator, Quad gauge panel: Air pressure, Brake oil temperature, Engine coolant temperature, Fuel level, Electric engine control fault indicator, Electric hour meter/tachometer, Speedometer, Tachometer, Transmission gear indicator, VIMS message center with universal gauge, VIMS keypad, Heater/defroster
  • Horn
  • ROPS cab insulated/sound suppressed
  • Storage compartment
  • Seatbelt, 75 mm (3 in), retractable
  • Steering wheel, tilt, padded, telescopic
  • Sun visor
  • Tinted glass
  • Window, electric powered, operator
  • Windshield wiper, intermittent control, and washer


  • Air Line Dryer (2)
  • Body Mounting Group
  • Auto lubrication system (Lincoln)
  • Dumping, Auxiliary Quick Connect for "Buddy Dumping"
  • Steering, Auxiliary Quick Connect for Towing
  • Continuous rear axle filtration
  • Diagonal stairway, 600 mm (24 in)
  • Driveline Operator Safety Guard
  • Fast-fill Fuel System
  • VIMS Dataport
  • Battery Disconnect
  • High speed crankcase oil change
  • Grease injector
  • Reservoirs (separate): Brake/converter/hoist, Steering, Transmission
  • S•O•S℠ ports
  • Supplemental steering, automatic
  • Tie down eyes
  • Tow hooks, front/tow pin, rear
  • Traction control system
  • Vital Information Management System (VIMS)
  • Mounting, Water with Hoist Cylinder


  • Object Detection System (cameras and radar)
  • Product Link Elite

785D Bare Chassis Optional Equipment


  • Engine pre-lube
  • Oil cooler, rear axle
  • Oil renewal system


  • Payload, digital display


  • Footrest, operator
  • Hose, cab clean-out
  • Vacuum, cab clean-out
  • Deluxe Cab: includes suspended operator seat, suspended companion seat, retractable front windshield visor, cab cleanout
  • Working at Heights


  • Mounting, Water without Hoist Cylinder
  • Brake Wear Indicator
  • Fire extinguisher, portable
  • Larger Fuel Tank: 2,498 Liter (660 gallon fuel tank) with a non-pressurizing fast fill system
  • Hub Odometer, Kilometers
  • Hub Odometer, Miles
  • Wheel Chocks
  • Quick Change Rims
  • Heater, Diesel fuel
  • Powered Stairway
  • Starting, Cold Weather
  • Service Center, Wiggins


  • Control, Road Analysis (RAC)


  • Water Cannon: hydraulically controlled, integrated joystick with cab controls, optional nozzles
  • Water System Monitor: integrated into cab, programmable spray configurations, automatic diagnostic messages
  • Parts & service available through global Cat dealer network
  • Independent Hydraulic Cooling System: minimizes overheating
  • Stainless Steel Spray Heads: maintenance free, patented design resists corrosion
  • Controls: Factory installed and integrated into cab
  • Variable Hydraulic Pump Drive: 1,200 gpm at speeds of 3 to 25 mph with auto shut-off and soft startup

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