Features at a glance
• Increased power and torque capacity to mate with modern 4-cycle high torque engines.
• Full time all wheel drive with differential lock. 30-70 and 50-50 biasing differentials available
for 4x4, 6x6 and 8x8 vehicles. Optional part time AWD system available.
• High capacity PTO clutch with ability to shift on the fly at high speeds.
• State of the art TDEC-400 electronic control system.

Torque Converter
Models
8MLW-1755-1 Up to 600 hp
(447 kW)
8MLW-1856-1 600 to 630 hp
(447 to 470 kW)
Mounting
SAE 1 wet flywheel housing
PTOs
Water pump: 0.98:1, 1.28:1, 1.64:1 ratio
Auxiliary: SAE B pump pad standard,
0.98:1 or 1.28:1 ratio
Weight, dry
900 lbs. (408 kg), depending on options
Consult factory for other PTO configurations and locations.
Consult factory for reduced weight options.
Transmission
Models
TD61-1179
output rotation same as engine for forward
TD61-1180
output rotation opposite engine for forward
Mounting
Remote mounted
Sump capacity 7 gal (26.5 L)
Weight, dry
1700 lbs. (770 kg)

Specifications
Maximum gross input power 630 hp (470 kW) @ 2100 RPM
Maximum gross input torque 1950 lb-ft (2644 N•m)
Maximum input speed 2300 RPM

Benefits
• Increased fire fighting efficiency: The Twin Disc transmission system permits faster shifts, rapid
acceleration and precise control of vehicle speed to meet ground requirements and varying tractive
conditions. The vehicle gets to location faster and starts pumping sooner to fight life-threatening
fires quickly.
• Ease of use: Advanced electronic control system tailored for ARFF vehicles integrates the control
of drive mode, PTO engagement, PUMP AND ROLL mode and frees the vehicle operator to concentrate
on his primary mission. Simple operation reduces training requirements.
• Reduced downtime: Durable heavy-duty components, combined with electronic controls which
prevent overspeed, shift shocks and reduce the effects of operator’s error, result in increased
machine availability and less wear and tear on other machine components.
• Extended service life: The 1180 Series transmission system utilizes the same components used in
heavy-duty off-highway units. This assures long life in ARFF vehicle operation.
• Integrated system components: Torque converter with integral power dividing, drop box-type
transmission and advanced electronic controls are all designed to work together as a system
rather than a collection of parts.