Cramp Angle - Cramp angle is set to achieve the greatest turning radius possible. Each front wheel
is set to zero degrees. The wheel is then turned until it reaches the steering stops. This
measurement is the cramp angle.
TIRE PRESSURE MONITORING DEVICE
Each tire installed on the apparatus shall be equipped with a tire pressure monitoring device. The
device shall consist of a valve stem cap with an LED tire alert to indicate tire pressure conditions.
The LED will flash when the tire drops 8 psi below the factory setting.
DIESEL ENGINE
The chassis shall be powered by a Cummins diesel engine as described below:
MODEL: ISL9-400
RATED BHP: 400 hp @ 2100 RPM
TORQUE: 1250 lb-ft @ 1400 RPM
GOVERNED RPM: 2200
Standard Equipment on the engine to include the following:
OIL FILTER: A full flow / by-pass combination
LUBE OIL COOLER: High efficiency non-drain back full flow cooling
FUEL FILTERS: Two fuel filters providing 3 / 10 micron absolute filtration
STARTER: A DELCO, 12 volt, 39 MT-HD starter motor
AIR COMPRESSOR: A Wabco 18.7 cfm compressor shall be provided
AIR CLEANER: Farr or equal with fresh air intake
ENGINE COOLANT RADIATOR
The engine coolant radiator shall have sufficient capacity to perform under the engine manufacturer
installation requirements. The chassis manufacturer shall demonstrate the ability to meet this
requirement with the submittal of an approved EPQ to the Town for the apparatus.
The bottom tank of the radiator shall have a drain valve for coolant removal.
The bottom tank of the radiator shall have a transmission cooler with a plate-type design.
The radiator system shall be pressurized with a cap rated per the cooling system requirements of
the engine manufacturer.
The engine fan shall be encompassed with a radiator shroud to provide the proper air flow from the
fan blade to the radiator. The perimeter of the radiator shall have recirculation baffles to eliminate
the possibility of recirculation of "hot" air to the face of the radiator core. The bottom of the
radiator shall have a recirculation baffle from the radiator to the frame rails.
COOLANT RECOVERY SYSTEM
A coolant recovery system shall be installed on the chassis. This tank is designed to capture
coolant overflow when the engine coolant warms and expands. As the engine cools the overflow
is then pulled out of the tank and back into the radiator, thus maintaining proper coolant levels.
CHARGE AIR COOLER RADIATOR
The engine charge-air cooler shall have sufficient capacity to perform under the engine
manufacturers installation requirements. The chassis manufacturer shall demonstrate the ability to
meet this requirement with the submittal of an approved EPQ to the Town for the apparatus.
The charge-air cooler shall be mounted directly in front of the engine coolant radiator. To reduce
