Product Feature
Heavy-Hauling Capacity
The CT681's set-forward axle, rugged design and industrial styling make it ideal for hauling heavy loads or working in extreme conditions. Aluminum alloy cab construction reduces overall weight for maximum payloads.
Attachment-Ready Design
Our integral Front Frame Extension (FFE) option makes it easy to mount attachments like snow plows, hose reels, winches and hydraulic pumps. Mixer installation is simple thanks to vertical tie-in plates mounted behind the cab.
Shift-Long Productivity
Comfortable drivers are safe, productive drivers. The CT681's wide, spacious cab is filled with ergonomic details to reduce fatigue and thoughtful features to enhance driver comfort, all shift long.
Safer Driving
Our ergonomically designed dashboard and center stack layout give drivers complete command and control. All controls, levers, switches and gauges are positioned to maximize safety and minimize fatigue, so drivers can stay focused on the job at hand.
Smooth, Quiet Ride
Our tuned cab air suspension system, premium grade sound insulation kit, and durable routing and clipping wire system dramatically reduce vibration and cab noise.
Vocational-Specific Power
Under the hood, the CT681 is powered by a Cat CT Series Vocational Truck Engine with ratings specific to vocational truck applications and a horsepower/torque combination to tackle the toughest jobs.
Automatic Shifting
Performance-matched with your engine to deliver rugged durability, smooth shifting and optimum power, the Cat CX31 Automatic Transmission will help you maximize your CT681's uptime, fuel economy and productivity. (Other transmission options are available.)
Unmatched Support
Your CT681 comes with the best on-the-ground support team in the business. Your Cat dealer not only offers bumper-to-bumper service, but also can help you order the exact truck you need with expertise on custom options ranging from transmissions to suspensions and axles.
Product Parameter
Overview
A natural extension of the Cat® product line, the Cat CT681 Vocational Truck delivers all the power, performance and productivity you expect from Caterpillar. This Class 8 set-forward axle model—ideal for hauling heavy loads—features a spacious and ergonomic cab, industrial styling, vocational-specific engine and transmission options, and bumper-to-bumper support across North America.
Engine
Units:
| Engine Model | Cat® CT13 Engine Cat® CT13 Engine | More |
| Horse Power at 1700 rpm | 365 - 430 hp (268 - 316 kW) 365 - 430 hp (268 - 316 kW) | More |
| Bore | 4.96 in 12.6 cm | More |
| Engine Type | Diesel, 4-Cycle Diesel, 4-Cycle | More |
| Configuration | Inline 6-Cylinder Inline 6-Cylinder | More |
| Stroke | 6.54 in 16.6 cm | More |
| Compression Ratio | 17:1 17:1 | More |
| Displacement | 758.0 in³ 12.4 l | More |
| Aspiration | Dual Series Turbochargers, Intercooler and Aftercooler Dual Series Turbochargers, Intercooler and Aftercooler | More |
| Combustion System | Direct Injection Direct Injection | More |
| Lubrication System Capacity | 42.0 qt (US) 40.0 l | More |
| Coolant Drain Interval | 600,000 miles (965,606 km) 600,000 miles (965,606 km) | More |
| Total Engine Weight - Dry | 2400.0 lb 1089.0 kg | More |
| Width | 37.0 in 94.0 cm | More |
| Length | 59.0 in 150.0 cm | More |
| Height | 49.0 in 125.0 cm | More |
| Valves | 4 Valves Per Cylinder, Overhead Cam Actuated 4 Valves Per Cylinder, Overhead Cam Actuated | More |
| Peak Torque - 1000 rpm | 1550 lb-ft (2102 N-m) 1550 lb-ft (2102 N-m) | More |
Transmission
| Maximum Gross Input Power | 550.0 HP 410.0 kW | More |
| Maximum Gross Input Torque | 1700.0 lb/ft 2400.0 N·m | More |
| Transmission Model | Cat CX31® Automatic Transmission Cat CX31® Automatic Transmission | More |
| Speeds | 6 forward/1 reverse 6 forward/1 reverse | More |
| Torque Converter | Cast aluminum design with lock up clutch Cast aluminum design with lock up clutch | More |
| Clutches | Electro-hydraulic fully modulated, oil cooled, multidisc Electro-hydraulic fully modulated, oil cooled, multidisc | More |
| Maximum Input Speed | 2500 rpm 2500 rpm | More |
| Length | 35.3 in 896.0 mm | More |
| Overall Length - With Retarder Option | 39.4 in 1000.0 mm | More |
| Overall Weight - Approximate | 906.0 lb 411.0 kg | More |
| Overall Weight - With Retarder Option | 1088.0 lb 494.0 kg | More |
| Power Take-Off | Two side locations and a Cat exclusive high output rear PTO Two side locations and a Cat exclusive high output rear PTO | More |
| Rear - PTO Capacity (Rotation Opposite of Engine, at 1.25 Engine Speed) | 800.0 ft-lb 1356.0 N·m | More |
| Side - PTO Capacity (Rotation Same as Engine, Ratio Determined by PTO Adaptor) | 700.0 ft-lb |
