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Caterpillar® Product Information
Salesgram
For Dealer Sales Personnel
August 1998
Cat® 785C/789C/793CMining TruckIntroduction
Caterpillar mining trucks have become the industry standard for
efficiency, productivity and durability since their introduction in
1984, with over 3,300 trucks shipped. With the introduction of the
C-Series mining trucks — the 793C in late 1996, and the785C/789C models scheduled for late 1998, additional
enhancements have been made to the entire mining truck product
line to help increase machine life and reduce operating costs.
Major enhancements include:
• Cat 3500 B-Series engine
• Redesigned operator’s station
• Integration and improvements to electronic controls
• Improved serviceability
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Designed and manufactured by Caterpillar, the durable and reliable
3500 B-Series engine is the result of proven technology and
performance. The 3500B engine is the heart of the C-Series power
train, providing customers with the lowest cost-per-ton hauling
alternative.
The Cat 3500 B-Series engine offers the following improvements
to the 785 and 789 C-Series mining trucks (these improvementswere made to the 793C when it was introduced in late 1996):
Higher Horsepower Ratings
Horsepower ratings increased by five percent for the 785C
and 789C. Engine power for the 785C increased from 1380 hp
(1029 kW) to 1450 hp (1082 kW), while the 789C increased from
1800 hp (1342 kW) to 1900 hp (1417 kW). Horsepower for the
793C remains unchanged at 2300 hp (1715 kW).
Improved Fuel Injection System
Brake Specific Fuel Consumption has improved 3 to 4 percent as
a result of 22 percent higher fuel injection pressures and shorter
injection cycles. Emissions (NOx) and oil sooting have also been
reduced as a result of these enhancements to the fuel injection
system. Camshafts, cam followers, push rods, rocker arms, and
gear train components were all strengthened in response to these
system changes.
3500 B-Series Engine
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Improved Air System
B-Series engines breathe easier due to the following
improvements:
• Improved inlet and exhaust system for streamlined air flow
through the combustion chamber.• Redesigned Separate Circuit Aftercooler System (SCAC).
• Redesigned camshaft for increased valve lift and improved
inlet/exhaust air exchange.
Electronic Control Module (ECM)
The 3500B’s Electronic Control Module (ECM) stores and selects
the appropriate injection timing and air/fuel ratio mixture for any
operational situation by monitoring sensors throughout the engine,
torque converter, transmission, and operator’s control station. The
ECM has been enhanced with the following additional features:• Exhaust temperature derating for extended component life.
• Automatic ether injection protects engine componentry.
• Flash programmable ECM memory for efficient system updates.
• Expanded system sensing, including: coolant flow, rear aftercooler
temperature, engine oil level, engine oil filter pressure/restriction,
turbo exhaust temperature, engine fan speed, air conditioner
compressor pressure and engine crankcase pressure.
• Overspeed monitoring, warning and self-protection.
• Acceleration delay on start-up for extended component life.
• Elevated low idle boosts efficient operating temperatures.
• Air filter restriction deration protects operating components.
• Fan clutch control (optional).
• Oil Renewal System control (optional).
• Pre-lubrication control (optional).
• Radiator Shutter control (optional).
Extended Service Intervals
Service intervals have been extended from 250 to 500 hours for
oil, oil filter, and fuel filter changes, reducing service time andincreasing machine availability.
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Major design improvements have been made to the operator’s
station on all three C-Series trucks to enhance operator comfort,
minimize fatigue, and maximize productivity.
Improved Ergonomics
• Electronically controlled body hoist control provides better
modulation and ease of operation. This hoist control is
hydraulically snubbed for improved comfort.
• Operator’s seat adjustments improved for better comfort.
• New telescopic/tilt steering column provides improved access
and operator comfort.
• Repositioned pedal controls provide easier, more natural actuation.
• New integrated electronic control for intermittent windshield
wiper, washer and turn signal for improved reliability.
• Enhanced instrument layout with backlit rocker switches forimproved visibility.
• Electric horn control mounted on steering wheel for easier access.
Enhanced Operator Comfort
• More powerful heating and air conditioning system provides
enhanced reliability and performance.
• Secondary brake control moved from column lever to floor pedal
for easier access.
• Operator’s seat redesigned and armrests added for improved
comfort.• Increased operator and passenger space provides more leg room
and storage space.
• Power window added to drivers side for ease of operation.
• Cab is radio ready with provision for add-on communication
packages for added versatility.
• Soft grey interior color reduces glare and adds to operators
perception of spaciousness.
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Operator’s Station
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Updated Electronic Control Module (ECM)
The Electronic Control Module (ECM) on 3500 B-Series engines
has been enhanced and updated with a number of new features.
(See engine improvements for more details).
A new Electronic Control Module, Transmission and Chassis
Control (TCC), replaces EPTCII and incorporates several new
system improvements. TCC communicates over the CAT Data
Link with the engine ECM to manage engine speed during shifts
for increased clutch life and operator comfort. TCC also controls
body hoist, neutral start, rear axle filtration, and automatic
lubrication functions.
Brake Circuits
Brake circuits have been integrated on all three C-Series trucks
to provide operators with the brake system confidence andperformance they have come to expect from Cat trucks through
the new Integrated Braking Control (IBC) system. This system
incorporates all the advantages of the proven Traction Control
System (TCS), Automatic Retarder Control (ARC) system, and
normal brake control systems into one simplified control module
located in the rear of the operator station.
Vital Information Management System (VIMS)
Caterpillar’s Vital Information Management System (VIMS), an
intelligent machine management tool, provides operators, service
personnel, and managers with information on a wide range of
machine functions. VIMS has been redesigned to relocate sensor
modules in the rear of the operator’s station on all three C-Series
trucks for improved reliability and serviceability.
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Electronic Controls
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Circuit Breakers
Circuit breakers have replaced fuses, providing additional
protection of electrical systems and improved serviceability.
Consolidated Electronic ControlsElectronic controls, including: Integrated Braking Control (IBC),
Vital Information Management System (VIMS), and the Transmission
and Chassis Control Module (TCC), have been consolidated for
simpler troubleshooting.
Heating and Air Conditioning System
The heating and air conditioning unit has been relocated to the
front of the operator’s station for easier serviceability, removal
and installation.
Turn Signals
Turn signal and amber lamps have been redesigned and now
feature LED lamps for improved visibility and longer life.
Significant improvements have been made to the 789C cooling
system to improve engine cooling, efficiency and emissions.
Larger Radiator Capacity
The capacity of the 789C cooling system has been expanded
40 percent by increasing the capacity of the radiator from 474 L(125 gal) to 663 L (175 gal).
Shunt Tank
A shunt tank has been added to the cooling system, providing
positive pressure at the coolant pump inlet to prevent cavitation
in high flow conditions.
Larger Fan
The fan diameter increased from 70 to 78 inches, and the number
of blades increased from 8 to 11 for improved cooling efficiency.
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Improved Serviceability
Improved Cooling Systemon 789C
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Metric English
Payload 118-136 130-150
metric tons U.S. tons
Standard Body Capacity:
Struck 57.0 m3 74.0 yd3
Heaped 2:1 (SAE) 78.0 m3 102.0 yd3
Body Capacity with
sideboards 460 mm (18")
Struck 74.0 m3 96.0 yd3
Heaped 2:1 (SAE) 91.0 m3 119.0 yd3
Standard Empty Machine
Weight (approximate) 94 922 kg 209,302 lb
Maximum Gross Vehicle
Machine Weight 249 480 kg 550,000 lb
Engine Cat 3512B EUIRated Speed 1750 rpm
Engine Power:
Gross 1082 kW 1450 hp
Net 1005 kW 1348 hp
Wheel Base 5180 mm 17'0"
Turning Diameter 27.5 m 90'2"
Steering Angle 36 degrees
Fuel Tank Capacity (standard) 1893 L 500 gal
Top Speed 54.8 km/hr 34.0 mphTransmission Speeds 6F - 1R
Brake Surface Area 150 962 cm2 23,405 in2
785C Brief Specifications
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789C Brief Specifications Metric English
Payload 154-177 170-195
metric tons U.S. tons
Standard Body Capacity:
Struck 73.0 m3 96.0 yd3
Heaped 2:1 (SAE) 105.0 m3 137.0 yd3
Body Capacity with
sideboards 460 mm (18")
Struck 94.0 m3 123.0 yd3
Heaped 2:1 (SAE) 120.0 m3 157.0 yd3
Standard Empty Machine
Weight (approximate) 119 793 kg 264,093 lb
Maximum Gross Vehicle
Machine Weight 317 520 kg 700,000 lb
Engine Cat 3516B EUIRated Speed 1750 rpm
Engine Power:
Gross 1417 kW 1900 hp
Net 1335 kW 1791 hp
Wheel Base 5700 mm 18'8"
Turning Diameter 27.5 m 90'2"
Steering Angle 36 degrees
Fuel Tank Capacity (standard) 3222 L 851 gal
Top Speed 54.4 km/hr 33.8 mphTransmission Speeds 6F - 1R
Brake Surface Area 198 338 cm2 30,742 in2
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Metric English
Payload 218 240
metric tons U.S. tons
Standard Body Capacity:
Struck 96.1 m3 125.7 yd3
Heaped 2:1 (SAE) 129.4 m3 169.3 yd3
Body Capacity with
sideboards 500 mm (20")
Struck 120.3 m3 157.4 yd3
Heaped 2:1 (SAE) 147.5 m3 193.0 yd3
Standard Empty Machine
Weight (approximate) 144 715 kg 319,050 lb
Maximum Gross Vehicle
Machine Weight 376 488 kg 830,000 lb
Engine Cat 3516B EUIRated Speed 1750 rpm
Engine Power:
Gross 1715 kW 2300 hp
Net 1615 kW 2166 hp
Wheel Base 5900 mm 19'4"
Turning Diameter 28.4 m 93'3"
Steering Angle 36 degrees
Fuel Tank Capacity (standard) 3785 L 1000 gal
Top Speed 54.3 km/hr 33.7 mphTransmission Speeds 6F - 1R
Brake Surface Area 224 317 cm2 34,769 in2
793C Brief Specifications
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TELQ4459August 1998
www.CAT.com
© 1998 Caterpillar
Printed in U.S.A.
The information contained herein is intended for circulation only to Caterpillar and dealer employees whose duties require knowledge of such reports and is
intended exclusively for their information and training. It may contain unverified analysis and facts observed by various Caterpillar or dealer employees. However,
effort has been made to provide reliable results regarding any information comparing Caterpillar built and competitive machines. Effort has been made to use the
latest available spec sheet and other material in the full understanding that these are subject to change without notice. Any reproduction of this release without
the foregoing explanation is prohibited.