CAT 789D®

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 is42,288 gallons (160 000 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 access to daily service points simplifies servicing
and reduces time spent on regular maintenanceprocedures. Enhanced serviceability and 500-hourservice intervals are designed to increase machine
availability and productivity.

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 mechanical drive powertrain and power shifttransmission provides unmatched operating efficiency
and control on steep grades, in poor underfootconditions, and on haul roads with high rolling
resistance. The 23% net torque rise provides unequaled
lugging force during acceleration, on steep grades andin rough underfoot conditions.

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)

789D Off-highway Truck Bare Chassis Specifications
Configurations and features may vary by region. Please consult your Cat® dealer for availability in your area.

EngineWeight Distributions – Approximate

Engine ModelCat® 3516C HD

Front Axle – Empty*

46 %Rated Engine Speed

1,750 rpm

Front Axle – Loaded

54 %Gross Power – SAE J1995

1566 kW

2,100 hp

Rear Axle – Empty*

33 %Rated Net Power – ISO 9249

1468 kW

1,969 hp

Rear Axle – Loaded

67 %Emissions Rating

Fuel Optimized*Depends on configuration.

Bore

170 mm

6.7 inStroke215 mm

8.5 in78.1 L

4,766 in 3

Displacement• 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).

Operating Weights – with Hoist Cylinders

Final Drives
Double-reduction, planetary, with full floating axles.
Differential Ratio

2.35:1

Planetary Ratio

10.83:1

Total Reduction Ratio

25.46:1

Transmission
Forward 1

12.6 km/h

7.8 mphForward 2

17.1 km/h

10.6 mph

Forward 3

23.1 km/h

14.4 mph

Forward 4

31.2 km/h

19.4 mph

Bare Chassis Weight103 700 kg

228,619 lb

Forward 5

42.3 km/h

26.3 mph

Payload216 300 kg

476,859 lb

Forward 6

57.2 km/h35.5 mph

Front Axle Bare Chassis Weight

57 657 kg

127,112 lb

Reverse11.8 km/h

7.3 mphFront Axle Payload

49 223 kg

108,518 lb• Maximum travel speeds with standard 37.00-R57 tires.

Rear Axle Bare Chassis Weight46 043 kg

101,507 lb

Rear Axle Payload

167 077 kg

368,341 lb

Operating Weights – without Hoist Cylinders
Bare Chassis Weight

101 140 kg

222,975 lb

Payload218 860 kg

482,503 lb

Front Axle Bare Chassis Weight

56 234 kg

123,975 lb

Front Axle Payload

50 646 kg

111,655 lb

Rear Axle Bare Chassis Weight

44 906 kg

99,000 lb

Rear Axle Payload

168 214 kg

370,848 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.

Braking System
Brake Surface – Front

81 693 cm2

12,662 in2

Brake Surface – Rear

134 590 cm2

20,862 in2

Brake Standards

ISO 3450:2011

Body Hoists
Pump Flow – High Idle

731 L/min

193 gal/min

Relief Valve Setting – Raise

17 238 kPa

2,500 psi

Body Raise Time – High Idle

18.9 seconds

Body Lower Time – Float

17.3 seconds

High Idle Body Lower Time – Power

15.6 seconds

Suspension
Effective Cylinder Stroke - Front

105 mm4 in
3.5 inWeights – Approximate

Effective Cylinder Stroke - Rear

93 mm

Rated Gross Machine Weight (RGMW)

324 319 kg

715,000 lb

Rear Axle Oscillation+/- 5.6 °Nominal Rated Payload (NRP)

194 tonnes

214 tons• Consult your tire manufacturer for maximum tire load.

2Service Refill Capacities
Fuel Tank

2082 L

550 galFuel Tank (optional)

3785 L 1,000 gal

Cooling System725 L

192 galCrankcase

291 L

77 galDifferentials and Final Drives

583 L

154 galSteering System

189 L

50 galBrake/Hoist System

909 L

241 galTransmission Tank

76 L

20 gal789D Off-highway Truck Bare Chassis Specifications

SteeringCat® Water Delivery System (WDS) - optional

Steering Standards
Steer Angle

ISO 5010:201936ºTurning Diameter – Front

27.53 m90.32 ft

Machine Clearance Diameter

30.23 m99.18 ft

Tires
Standard Tire

37.00-R57

Optional Tire

40.00-R57• Productive capabilities of the 789D truck are such that, under certain

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

Cab
ROPS Certification Rating
789D WTR (Tractor)

Tractor ROPS Rating
117 000 kg

257,940 lb• The operator sound pressure levels are measured according to work

cycle procedures specified in ISO 6394:2008 and ISO 6396:2008 is 78dB(A).
• The exterior sound power level for the standard machine is tested
using ISO 6393:2008 and ISO 6395:2008 procedures is 121 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.
• ROPS (Rollover Protective Structure) for cab offered by Caterpillar
meets ISO 3471:2008 ROPS criteria.
• FOPS (Falling Objects Protective Structure) meets ISO 3449:2005 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.

Operator selectable coverage

0.2-0.8 L/m2(4 kph - 40 kph)0.5-0.2 gal/ft 2(3 mph - 25 mph)

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 galSpray width per head(dependent on flow)
Spray system hydraulic tankcapacity
Maximum 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
Wet water pump/hydraulic motor coupling• Coverage rates above 0.6 L/m2 may not be available at higher

speeds depending on head count and configuration.

• Opening is automatically controlled by the system to achieve

AutoMode Coverage or Manual Mode Flow Rate.

• AutoMode Spray controls water coverage automatically to thenumber 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

789D Off-highway Truck Bare Chassis Specifications
Dimensions
All dimensions are approximate.
11107894653122
11920211613 14

151718222325262728312932303637333534424

789D Off-highway Truck Bare Chassis Specifications
Dimensions
1 Overall Length ** (does not include Wheel Chocks)

10 860 mm

427.56 in

2 Wheel Base

5700 mm

224.4 in

3 Rear Axle to Body Pivot

592 mm23.3 in4 Height to Top of ROPS **5510 mm

216.9 in

5 Distance Between Tires**2230 mm87.8 in

6 Distance Between Body Pivot and Rear Axle

1678 mm66.06 in

7 Distance between Body Pivot and Hoist Cylinders - Horizontal

2360 mm

92.9 in

8 Distance between Main Beam and Top of Air Cleaner

1293 mm

50.91 in16.6 in

9 Distance between Main Beam and Engine Hood - Vertical

422 mm10 Distance between Main Beam and Engine Hood - Horizontal

411 mm16.2 in

11 Overall Width

7757 mm

305.4 in

12 Engine Guard Clearance **1290 mm50.79 in

13 Distance Between Hoist Cylinders

2400 mm94.5 in

14 Distance Between Body Pivots - Outer

1885 mm74.21 in

15 Distance Between Body Pivots - Inner

1518 mm59.79 in

16 Body Pivot Bearing Width

183.5 mm

7.22 in

17 Distance Between Frame Rails

1470 mm

57.87 in18 Frame Rail Width

192 mm7.56 in

19 Cab Width

1660 mm65.35 in

20 Distance between Rocker Pads

3180 mm

125.2 in

21 Height of the Cab from Main Beam

1590 mm62.6 in

22 Overall Tire Width

6926 mm27.68 in

23 Distance Between Main Beam and Cab Front

1927 mm

24 Cab Front Angle

75.86 in18 degrees

25 Cab Rear Angle

21.33 degrees

26 Distance between Main Beam and Cab Roof680 mm

26.77 in

27 Main Beam Width

370 mm14.56 in

28 Distance Between Main Beam and Cab Rear

43 mm

1.69 in

29 Rocker Pad Height

90 mm

3.54 in

30 Main Beam Height

386 mm15.2 in

31 Distance Between Body Pivot and Main Beam4925 mm

193.9 in

32 Body Pivot Outer Radius

240 mm

9.45 in33 Body Pivot Pin Diameter

129 mm

5.10 in

34 Distance Between Body Pivot and Frame

230 mm35 Frame Slope Angle

9.06 in6 degrees

36 Distance between Main Beam and Body Pivot Pin526 mm

20.7 in

37 Distance between Body Pivot and Hoist Cylinders - Vertical

220 mm

8.66 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. The 789D truck comes with the single body hoist retention cast mount on axle housing.

5789D 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 3516C HD-EUI diesel engine:• Ground level engine shutdown• Ether starting aid (automatic)• Aftercooler (separate circuit or air to air)
• Elevated low idle control• Automatic starter protection• Multi-point oil pressure sensing
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
Prelube, engine
Transmission:• 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• Oil level sensor• Rear axle continuous lubrication/filtration
Oil renewal system
Extended life coolant to-35° C (-30° F)

Standard Optional
OPERATOR ENVIRONMENTAir Conditioner
Auxiliary power connection/cigarette lighter
Diagnostic connection port
Dome courtesy lightEntertainment radio ready: 5 amp converter,speakers, antenna, wiring harness
Footrest, operator
Gauges/Indicators:• Air cleaner service indicator•••••••• Quad gauge panel: Air pressure, Brake oiltemperature, Engine coolant temperature, Fuellevel•
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• Electric engine control fault indicator• Electric hour meter/tachometer• Speedometer• Tachometer• Transmission gear indicator• VIMS message center with universal gauge• VIMS keypad• Heater/defroster
Hoist, body control (electric)
HornMirrors, right and left (heated)
ROPS cab insulated/sound suppressed
Seatbelt, operator, park brake safety / seatbelt trainer
Stairway and walkway access, 600 mm
Steering wheel, tilt, padded, telescopic
Window, electric powered, operatorWindshield wiper, intermittent control, and washer
Deluxe Cab•••••••••••••••••••••••••••CAT TECHNOLOGY PRODUCTS

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 and foglights• Lo-hi beam selector• Ladder light/service deck
• Stop/tail lights• Engine compartment• VIMS, blue light
Lockout transmission, ground levelAuxiliary work lights (1) RH side, (1) LH side
Payload, indicator lights
Payload, digital display

6

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

Control, Road Analysis (RAC)

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789D Off-highway Truck Bare Chassis Specifications
Standard and Optional Equipment
Standard and optional equipment may vary. Consult your Cat dealer for details.
Standard Optional

Standard Optional

Grease injector•CAT WATER DELIVERY SYSTEM (WDS) - OPTIONAL ATTACHMENT
Controls:Air line dryer•• Factory installed•Auto lubrication system•• Integrated into cab•

Aux "buddy" dumping quick connect•

Water System Monitor:

Aux steering quick connect (towing)•• Integrated into cab••

• Programmable spray configurations•• Automatic diagnostic messages•

OTHER EQUIPMENT

Body mounting group
Center mounted rims (6) (29x57)--(Used for 37.00
R57 tires)•Driveline guard (fully enclosed)•• 1,200 gpm at speeds of 3 to 25 mph•

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

Ground level VIMS data port•

• Soft startup•

Ground level battery disconnect•

Rock ejectors

Stainless Steel Spray Heads:•

Supplemental steering (automatic)• Resists corrosion••

Tow hooks (front)/tow pin (rear)• Maintenance free••Traction control system• Patented design••

Vital Info Management System (VIMS)

Independent Hydraulic Cooling System:•

Variable Hydraulic Pump Drive:• Minimizes overheating•

Mounting, Water without Hoist Cylinder•

Powered Stairway

Water Cannon:•

Working at Heights• Hydraulically controlled•

Rear axle, cooler• Optional nozzles•• Integrated joystick with cab controls• Brake oil, recirculating•

WDS Camera System: includes three cameras,three camera washers and cable assemblies• Cold weather start•

Parts & service available through global Cat dealer network

Cold weather:••••

Service center:• Service, 3516C, standard volume•• Service, 3516C, large volume•• Service, engine oil, standard•

Fire extinguisher, portable•

Hub odometer, kilometers•

Wheel chocks•

Gauge, brake wear indicator•

Coolant, –50° C (–58° F)•7For more information on Cat Truck Bare Chassis, contact OEM Solutions:
oem_solutions@cat.com | www.cat.com/oemsolutions© 2023 Caterpillar
All rights reserved
Materials 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.

AEXJ0123-01 (06-2023)