CAT 785D®

OFF-HIGHWAY TRUCK BARE CHASSIS

Caterpillar offers off-highway truck bare chassis designed for specialty machines in a variety of applications —including water trucks, tow tractors, and fuel / lube trucks. When configured as a water truck, the tank capacity is
30,000 gallons (113 500 liters). These partial machine configurations allow construction, quarry, and mining customers topurchase complete solutions from our global Cat ® dealer network — with support every step of the way.

PROVEN CAT TRUCK PLATFORMSERVICE WITH EASE

Cat trucks are built for durability, reliability, andefficiency to deliver the performance you need insome of the toughest applications around the world.

Easy maintenance procedures ensure high reliability
and long life with low operating costs. Easy access todaily service points simplifies servicing and reducestime spent on regular maintenance procedures.

APPLICATION-SPECIFICCAB & ROPS CERTIFICATIONCat Off-Highway Truck Bare Chassis ROPS is certified
to ISO 3471 Tractor criteria, to provide a higher levelof protection for towing applications.

CUSTOMIZATIONFOR YOUR APPLICATION
Cat bare chassis can be customized for yourapplication — including water trucks, tow tractors,and fuel / lube trucks.

POWER TO THE GROUNDThe Cat 6-speed planetary power shift transmission ismatched with the direct-injection 3512C engine todeliver constant power over a wide range of operating
speeds and is built tough for long life between overhauls.

SUPPORTED BY THE CAT DEALER
NETWORK+ Full support of Cat dealer and parts network+ Cat dealer installation & retrofit kits available+ Eligible for Equipment Protection Plans (EPP)& Customer Value Agreements (CVAs)

785D Off-highway Truck Bare Chassis Specifications
Configurations and features may vary by region. Please consult your Cat® dealer for availability in your area.

EngineWeights – ApproximateEngine ModelCat® 3512C HD

Rated Gross Machine Weight (RGMW)

249 476 kg

550,000 lb

Rated Engine Speed

1,750 rpm

Nominal Rated Payload (NRP)

141 tonnes

155 tons

Gross Power – SAE J1995:20141082 kW

1,450 hp

Net Power – SAE J1349:2011/ISO 9249:2007

1005 kW

1,348 hp

1082 kW

1,450 hp

Engine Power – ISO 14396:2002
Emissions Rating
Torque Rise• Consult your tire manufacturer for maximum tire load.

Weight Distributions – Approximate

Fuel Optimized

Front Axle – Empty*

53.25 - 53.63 %23%

Front Axle – Loaded

33.3 %

Bore

170 mm

6.7 inRear Axle – Empty*

46.37 - 46.75 %Stroke215 mm

8.4 inRear Axle – Loaded

66.7 %

Displacement

58.56 L3,573.6 in 3

• Net Power advertised is the power available at the flywheel whenthe engine is equipped with air intake system, exhaust system, andalternator.
• Power rating applies at 1,750 rpm when tested under the specified
condition for the specified standard.
• Ratings based on SAE J1995 standard air conditions of 25° C (77° F)
and 99 kPa (29.32 Hg) barometer. Power based on fuel having API
gravity of 35 at 16° C (60° F) and an LHV of 42 780 kJ/kg (18,390 BTU/lb)
when engine used at 30° C (86° F).
• No engine derating required up to 4267 m (14,000 ft) altitude.

Operating Weights – with Hoist Cylinders
Bare Chassis Weight82 022 kg

180,827 lb

Payload167 454 kg

369,173 lb

Gross Vehicle Weight249 476 kg

550,000 lb

Front Axle Bare Chassis Weight

43 677 kg

96,290 lb

Front Axle Payload39 399 kg

86,860 lb

Front Axle Gross Vehicle Weight

83 076 kg

183,150 lb

Rear Axle Bare Chassis Weight

38 345 kg

84,537 lb

Rear Axle Payload

128 055 kg

282,313 lb

Rear Axle Gross Vehicle Weight

166 401 kg

366,850 lb

Operating Weights – without Hoist Cylinders
Bare Chassis Weight

80 426 kg

177,309 lb

Payload169 050 kg

372,691 lb

Gross Vehicle Weight249 476 kg

550,000 lb

Front Axle Bare Chassis Weight

43 133 kg

95,091 lb

Front Axle Payload

39 943 kg

88,059 lb

Front Axle Gross Vehicle Weight

83 076 kg

183,150 lb

Rear Axle Bare Chassis Weight

37 294 kg

82,218 lb

Rear Axle Payload

129 107 kg

284,632 lb

Rear Axle Gross Vehicle Weight

166 401 kg

366,850 lb• The payload includes anything added to the bare chassis.
• Care must be taken when designing any attachments so that the axle

weights are not exceeded.

2*Depends on configuration.

Final Drives
Planetary with full floating axles.
Differential Ratio

2.10:1

Planetary Ratio

10.83:1

Total Reduction Ratio

22.75:1

Transmission
Forward 1

12.1 km/h

7.5 mphForward 2

16.3 km/h

10.2 mph

Forward 3

22.2 km/h

13.8 mph

Forward 4

29.9 km/h

18.6 mph

Forward 5

40.6 km/h

25.2 mph

Forward 6

54.8 km/h

34 mphReverse11 km/h

6.8 mph• Maximum travel speeds with standard 33.00-R51 tires.

Braking System
Brake Surface – Front

61 270 cm2

9,497 in2

Brake Surface – Rear

89 729 cm

13,908 in2

Brake Standards

2ISO 3450:2011

Body Hoists
Pump Flow – High Idle

750 L/min

198 gal/min

Relief Valve Setting – Raise

17 238 kPa

2,500 psi

Body Raise Time – High Idle

15.2 seconds

Body Lower Time – High Idle

15.9 seconds

Body Lower Time – Float

16.2 seconds

Body Power Down – High Idle

15.9 seconds• Twin, two-stage hydraulic cylinders mounted inside main frame;
double-acting cylinders in second stage.
• Power raise in both stages; power down in second stage.

Suspension
Effective Cylinder Stroke - Front

306.5 mm

12.1 in

Effective Cylinder Stroke - Rear

165 mm6.5 inRear Axle Oscillation+/- 5 °

785D Off-highway Truck Bare Chassis Specifications

Service Refill Capacities

Cat® Water Delivery System (WDS) - optional

Fuel Tank

1893 L

500 galCooling System

379 L

100 galCrankcase

204 L

54 galDifferentials and Final Drives

436 L

115 galSteering Tank

90 L

24 galSteering System (includes tank)

117 L

31 galBrake/Hoist System

337 L

89 galBrake Hoist System (includes tank)

641 L

169 galTorque Converter/Transmission System(Includes Sump)

248 L

65.51 gal

Steer Angle

36º29.8 m97.7 ft

Machine Clearance Diameter

33.2 m

109 ftTires
33.00-R51 (E3 & E4)• Productive capabilities of the 785D truck are such that, under certain

job conditions, TKPH (TMPH) capabilities of standard or optional tires
could be exceeded and, therefore, limit production.
• Caterpillar recommends the customer evaluate all job conditions andconsult the tire manufacturer for proper tire selection.

Air Conditioning

42 780 kJ/kg 18,390 BTU/lb

Heater / Defroster

11 070 kCal

ROPS Certification Rating
785D WTR (Tractor)

3785 L/min

1,200 gal/min

Maximum water flow
Water per spray head (minimum)

130 L/min

35 gal/min

Water per spray head (maximum)

2270 L/min

600 gal/min

Spray head opening range (minimum)

1 mm

0.04 inSpray head opening range(maximum)

19 mm

0.75 inMaximum size debris flushed
through spray head

19 mm

0.75 in

4.5-9.1 m

15-30 ft

27.5 L

7.25 galMaximum number of rear sprayheads

7

Minimum number of rear sprayheads

3

Maximum number of front/side
spray heads

2

Minimum number of front/side
spray heads

0

Maximum water from cannon(idle)

2271 L/min

600 gal/min

Maximum water from cannon(high idle)

4732 L/min

1,250 gal/min

61 m

200 ftMaximum cannon spray distance

CabSound Standards

0.5-0.2 gal/ft 2(3 mph - 25 mph)

Spray system hydraulic tankcapacity

ISO 5010:2007

Turning Diameter – Front

Standard Tire

0.2-0.8 L/m2
(4 kph - 40 kph)

Spray width per head(dependent on flow)

Steering
Steering Standards

Operator selectable coverage

Wet water pump/hydraulic motor coupling

43,930 BTU• Coverage rates above 0.6 L/m2 may not be available at higher

ANSI/SAE J1166 MAY90
SAE J88 APR95• Opening is automatically controlled by the system to achieve

Tractor ROPS Rating• AutoMode Spray controls water coverage automatically to the94 000 kg

207,234 lb• The operator sound exposure Leq (equivalent sound pressure level)measured according to work cycle procedures specified in ANSI/SAE
J1166 MAY90 is 80 dB(A) for cab offered by Caterpillar, when properly
installed, maintained and tested with doors and windows closed.
• The exterior sound pressure level for the standard machine measured
at a distance of 15 m (49 ft) according to the test procedures specifiedin SAE J88 APR95, mid-gear moving operation is 89 dB(A).
• Hearing protection may be needed when operating with an open
operator station and cab (when not properly maintained or doors/windows open) for extended periods or in a noisy environment.
• The ROPS (Rollover Protective Structure) for the offered by Caterpillar
meets ISO 3471:1994 ROPS criteria.
• The FOPS (Falling Objects Protective Structure) meets ISO 3449:1994
Level II FOPS criteria.
• Note: Welding on ROPS or making modifications to the ROPS mayvoid the ROPS certification. Please contact Caterpillar OEM Solutions
if the application requires welding on the machine frame.

speeds depending on head count and configuration.

AutoMode Coverage or Manual Mode Flow Rate.

number of heads being used and ground speed achieved.

• Manual Mode allows the operator to set a water flow rate that isconstant regardless of ground speed.

• Spray Heads on competitive water distribution systems require

tools and maintenance to change flow and spray pattern.
Caterpillar is the only company to have variable active spray heads
to regulate water spray.
• Water flow is continually adjusted during operation to conserve
water and achieve desired coverage and flow rate.

3

785D Off-highway Truck Bare Chassis Specifications
Dimensions
All dimensions are approximate.
1110879463512

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Dimensions
1 Overall Length ** (does not include Wheel Chocks)

9730 mm383.07 in

2 Wheel Base

5180 mm

203.94 in

3 Distance between Tires **2165 mm85.24 in4 Height to Top of ROPS **5143 mm

202.48 in

5 Rear Axle to Body Pivot

637 mm25.07 in

6 Distance between Body Pivot and Rear Axle

1595 mm62.80 in

7 Distance between Body Pivot and Hoist Cylinders - Horizontal

2251 mm

88.62 in

8 Distance between Main Beam and Top of Air Cleaner

1293 mm

50.91 in25.59 in

9 Distance between Main Beam and Engine Hood - Vertical

650 mm10 Distance between Main Beam and Engine Hood - Horizontal

268 mm

10.55 in

11 Overall Width7703 mm

303.27 in

12 Engine Guard Clearance **980 mm38.58 in

13 Distance between Hoist Cylinders

2348 mm

92.44 in

14 Distance between Body Pivots - Outer

1885 mm74.21 in

15 Distance between Body Pivots - Inner

1518 mm59.76 in

16 Body Pivot Bearing Width

175 mm

6.89 in

17 Distance between Frame Rails

1510 mm59.45 in18 Frame Rail Width

200 mm

7.87 in19 Cab Width

1660 mm65.35 in

20 Height of the Cab from Main Beam

1639 mm64.53 in

21 Distance between Rocker Pads

3000 mm

118.11 in

22 Overall Tire Width

6277 mm

20.58 in

23 Distance between Main Beam and Cab Front

1955 mm

24 Cab Front Angle

76.97 in18 degrees

25 Cab Rear Angle

21.33 degrees

26 Distance between Main Beam and Cab Roof

625 mm24.61 in

27 Distance between Main Beam and Cab Rear

390 mm15.35 in

28 Main Beam Width

361 mm

14.21 in

29 Rocker Pad Height

80 mm

3.15 in

30 Main Beam Height354 mm

13.94 in

31 Distance between Body Pivot and Main Beam

4658 mm

183.39 in

32 Body Pivot Outer Radius

240 mm

9.45 in33 Body Pivot Pin Diameter

129.5 mm5.10 in

34 Distance between Body Pivot and Frame230 mm

35 Frame Slope Angle

9.06 in
7.5 degrees

36 Distance between Main Beam and Body Pivot Pin

439 mm

17.28 in

37 Distance between Body Pivot and Hoist Cylinders - Vertical

194 mm

7.64 in** These dimensions may vary based on tire size, pressure and load. All dimensions are for reference only and may change for different machine configurations.

5785D Off-highway Truck Bare Chassis Specifications
Standard and Optional Equipment
Standard and optional equipment may vary. Consult your Cat dealer for details.
Standard Optional
POWERTRAIN
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)• Engine pre-lubeBraking 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 discTransmission:• 6-speed automatic powershift with electriccontrol (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
Oil quick disconnect
Oil cooler, rear axleOil renewal system
ELECTRICAL
Alarm, Back-up
Alternator, 105 ampere
Batteries, 12V (2), 93 amp/hourConverter, 12V electricalElectrical 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
Payload, digital display

6Standard Optional
OPERATOR ENVIRONMENTAir Conditioner
Coat hook
Diagnostic connection port
Dome courtesy lightEntertainment radio ready: 5 amp converter,speakers, antenna, wiring harness
Footrest, operator
Gauges/Indicators:• Air cleaner service indicator

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• Quad gauge panel: Air pressure, Brake oiltemperature, Engine coolant temperature, Fuellevel• Electric engine control fault indicator• Electric hour meter/tachometer• Speedometer• Tachometer• Transmission gear indicator• VIMS message center with universal gauge• VIMS keypad• Heater/defroster
HornHose, cab clean-out
ROPS cab insulated/sound suppressed
Storage compartment
Seatbelt, 75 mm (3 in), retractableSteering wheel, tilt, padded, telescopic
Sun visor
Tinted glass
Window, electric powered, operator
Windshield wiper, intermittent control, and washer
Vacuum, cab clean-out•
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Deluxe Cab: includes suspended operator seat,suspended companion seat, retractable front
windshield visor, cab cleanout•CAT TECHNOLOGY PRODUCTS
Object Detection System (cameras and radar)
Product LinkTM EliteControl, Road Analysis (RAC)

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785D Off-highway Truck Bare Chassis Specifications
Standard and Optional Equipment
Standard and optional equipment may vary. Consult your Cat dealer for details.
Standard Optional
OTHER EQUIPMENT

Standard Optional

Air Line Dryer (2)•CAT WATER DELIVERY SYSTEM (WDS) - OPTIONAL ATTACHMENTControls:

Body Mounting Group•• Factory installed•

Auto lubrication system (Lincoln)•• Integrated into cab•

Dumping, Auxiliary Quick Connect for “BuddyDumping”•Steering, Auxiliary Quick Connect for Towing•Continuous rear axle filtration

Water System Monitor:• Integrated into cab•

• Programmable spray configurations••• Automatic diagnostic messages•

Diagonal stairway, 600 mm (24 in)•

Variable Hydraulic Pump Drive:

Driveline Operator Safety Guard•• 1,200 gpm at speeds of 3 to 25 mph•

Fast-fill Fuel System•• Auto shut-off•

VIMS Dataport•• Soft startup

Battery Disconnect••

High speed crankcase oil change•

Stainless Steel Spray Heads:

Grease injector•

Reservoirs (separate): Brake/converter/hoist,Steering, Transmission
S•O•SSM sample 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••• Resists corrosion•• Maintenance free•• Patented design•

Independent Hydraulic Cooling System:• Minimizes overheating•

Water Cannon:• Hydraulically controlled•• Optional nozzles• Integrated joystick with cab controls••

WDS Camera System: includes three cameras,
three camera washers and cable assemblies

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•

Working at Heights••

Parts & service available through global Cat dealer network

7

For more information on Cat Truck Bare Chassis, contact OEM Solutions:
oem_solutions@cat.com | www.cat.com/oemsolutions© 2024 CaterpillarAll rights reservedMaterials and specifications are subject to change without notice. Featured machines in photos may include additional
equipment. See your Cat dealer for available options.
CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Corporate Yellow,” the “Power Edge”
and Cat “Modern Hex” trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar
and may not be used without permission.

PEDJ0954 (02-2024)