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.
785D Bare Chassis
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 / 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.
Engine Model
Cat® 3512C HD
Rated Engine Speed
1750 r/min
Gross Power - SAE J1995
1450 HP
DOWNLOAD TECHNICAL SPECIFICATIONS
Specification
Value
Engine Model
Cat® 3512C HD
Rated Engine Speed
1750 r/min
Gross Power - SAE J1995
1450 HP
Rated Net Power - SAE J1349
1348 HP
Bore
6.7 in
Stroke
8.4 in
Displacement
3573.6 in³
Note
Net Power advertised is the power available at the flywheel when the engine is equipped with air intake system, exhaust system, and alternator
Specification
Value
LRC Bare Chassis Weight without Hoist
177309 lb
LRC Bare Chassis Weight with Hoist
180827 lb
LRC Gross Vehicle Weight (Target) with Hoist
550000 lb
LRC Gross Vehicle Weight (Target) without Hoist
550000 lb
Specification
Value
Nominal Water Tank Capacity
30000 gal (US)
Specification
Value
Tractor ROPS
207234 lb
Specification
Value
Forward - 1
7.5 mile/h
Forward - 2
10.2 mile/h
Forward - 3
13.8 mile/h
Forward - 4
18.6 mile/h
Forward - 5
25.2 mile/h
Forward - 6
34 mile/h
Reverse
6.8 mile/h
Note
Maximum travel speeds with standard 33.00-R51 tires.
Specification
Value
Brake Surface - Front
9497 in²
Brake Surface - Rear
13908 in²
Specification
Value
Fuel Tank Capacity
500 gal (US)
Cooling System
100 gal (US)
Crankcase
54 gal (US)
Differential - Final Drives
115 gal (US)
Steering System - Including Tank
31 gal (US)
Brake Hoist System
89 gal (US)
Brake/Hoist Hydraulic Tank
169 gal (US)
Torque Converter - Transmission System
65.51 gal (US)
Specification
Value
Steering Standards
ISO 5010:2007
Steer Angle
36 °
Turning Diameter
97.7 ft
Turning Circle - Clearance Diameter
109 ft
  • Cat® Off-Highway Truck Bare Chassis ROPS is certified to ISO 3471 Tractor criteria, to provide a higher level of protection for towing applications.
  • Cat Off-Highway Truck Bare Chassis are rugged and reliable platforms for water truck applications in both mining and construction projects.
  • Using an off-highway truck bare chassis provides a solution that is ideal for dust suppression, road construction, fire protection, and other applications.
  • Caterpillar works with OEMs worldwide to match the appropriate bare chassis machine to the water truck application, all through your local Cat dealer, to provide the best solution for your business.
  • Cat Off-Highway Truck Bare Chassis are rugged and reliable platforms for service truck applications in both mining and construction projects.
  • Using an off-highway truck bare chassis provides a solution that is ideal for delivering fuel and preventive maintenance lubrication to your site's machine fleet.
  • Caterpillar works with OEMs worldwide to match the appropriate bare chassis machine to the service truck application, all through your local Cat dealer, to provide the best solution for your business.
  • Cat Off-Highway Truck Bare Chassis are rugged and reliable platforms for tow applications.
  • Using an off-highway truck bare chassis provides a solution that is ideal for equipment trailers and bottom dump trailers.
  • Caterpillar works with OEMs worldwide to match the appropriate bare chassis machine to the tow application, all through your local Cat dealer, to provide the best solution for your business.