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CT681 Specifications
Engine Model Cat® CT13 Engine
Horse Power at 1700 rpm 365 - 430 hp (268 - 316 kW)
Engine Model Cat® CT13 Engine
Bore 4.96 in

Engine

Engine Model
Cat® CT13 Engine
Horse Power at 1700 rpm
365 - 430 hp (268 - 316 kW)
Engine Model
Cat® CT13 Engine
Bore
4.96 in
Engine Type
Diesel, 4-Cycle
Bore
4.96 in
Configuration
Inline 6-Cylinder
Stroke
6.54 in
Configuration
Inline 6-Cylinder
Stroke
6.54 in
Displacement
758.0 in3
Compression Ratio
17:1
Displacement
758 in³
Aspiration
Dual Series Turbochargers, Intercooler and Aftercooler
Aspiration
Dual Series Turbochargers, Intercooler and Aftercooler
Combustion System
Direct Injection
Lubrication System Capacity
42 qt (US)
Coolant Drain Interval
600,000 miles (965,606 km)
Total Engine Weight - Dry
2400 lb
Width
37 in
Length
59 in
Height
49 in
Valves
4 Valves Per Cylinder, Overhead Cam Actuated
Peak Torque - 1000 rpm
1550 lb-ft (2102 N-m)

Transmission

Maximum Gross Input Power
550 mm H2O
Maximum Gross Input Torque
1700 lb/ft
Transmission Model
Cat CX31® Automatic Transmission
Speeds
6 forward/1 reverse
Torque Converter
Cast aluminum design with lock up clutch
Clutches
Electro-hydraulic fully modulated, oil cooled, multidisc
Maximum Input Speed
2500 rpm
Length
35.3 in
Overall Length - With Retarder Option
39.4 in
Overall Weight - Approximate
906 lb
Overall Weight - With Retarder Option
1088 lb
Power Take-Off
Two side locations and a Cat exclusive high output rear PTO
Rear - PTO Capacity (Rotation Opposite of Engine, at 1.25 Engine Speed)
800 ft-lb
Side - PTO Capacity (Rotation Same as Engine, Ratio Determined by PTO Adaptor)
700 ft-lb
  • Chasis
    • Set-forward axle, 114-inch bumper to back of cab (BBC)
    • 12.25-inch rail size: 120,000 psi yield strength
    • Above-rail radiator
  • Axles
    • Meritor & Dana options
    • 6x4 truck configuration
  • Front Suspension
    • Parabolic taper leaf for a smoother ride
    • Shock absorbers standard
    • Optional two-stage, multi-leaf, shackle-type with shocks
  • Rear Suspension
    • Hendrickson offerings: HMX, RT/RTE, RS, R & PriMaax
    • Chalmers standard & high articulation
    • Capacities from 40,000-85,000 lbs.
  • Fuel Tank
    • 80-, 100- & 120-gallon capacities
    • Single left or dual under cab/back of cab options
    • Aluminum alloy construction
  • Chassis
    • Integral Front Frame Extension (FFE)
  • Transmission
    • Cat CX31 Automatic Transmission
    • A variety of manual transmissions and the Ultrashift® Plus Vocational Transmission built by Eaton
  • On-Board Technology
    • Vehicle Infotainment System
    • Bendix Tire Pressure Monitoring System