Specifications

Loveland Fire/Rescue
Pumper
Production Specification
SVI #769 Page 30 of 125 June 17, 2010
..\4) Pricing & Change Orders\Production Change Order.pdf
ENGINE FAN DRIVE
The engine cooling system fan shall incorporate a thermostatically controlled, Horton clutched type fan drive.
When the clutched fan is disengaged it shall facilitate improved vehicle performance, cab heating in cold climates, and
fuel economy. The fan clutch design shall be fail safe so that if the clutch drive fails the fan shall engage to prevent
engine overheating due to the fan clutch failure.
ENGINE COOLING SYSTEM
There shall be a heavy-duty aluminum cooling system designed to meet the demands of the fire industry. The cooling
system shall have the capacity to keep the engine properly cooled under all conditions of road and pumping operations.
The cooling system shall be designed and tested to meet or exceed the requirements specified by the engine and
transmission manufacturer and all EPA requirements. The complete cooling system shall utilize heavy-duty welds and be
mounted to isolate the entire system from vibration or stress. The individual cores of the cooling system shall be mounted
in a manner to allow expansion and contraction at various rates without inducing stress into the adjoining cores.
The cooling system shall be comprised of a stacked, single depth package that provides the maximum cooling capacity
for the specified engine as well as offers excellent serviceability. The main components shall include a surge tank, a
charge air cooler, a recirculation shield, and a radiator.
Proposals unable to offer a stacked single depth cooling package shall not be considered.
There shall be a single depth core that allows greater efficiency, enhanced serviceability, and lighter weight with a higher
ambient capability.
The cooling package core shall not protrude below the frame of the vehicle by more than 1.1 inch. This feature shall
improve the angle of approach thereby reducing possible damage.
The radiator shall be a cross-flow design constructed completely of aluminum with welded side tanks. The radiator shall
include a minimum of a 627 square inch core and shall be bolted to the bottom of the charge air cooler to allow a single
depth core, thus allowing a more efficient and serviceable cooling system. The radiator shall be equipped with a drain
cock to drain the coolant for serviceability.
The cooling system shall include a one piece injected molded Polymer fan blade designed to provide long life in harsh
environments. Polymer fans provide a significant weight reduction over metal fans providing longer life for fan clutch
linings and bearings along with increased fan belt life.
The cooling system shall be equipped with a surge tank that is capable of removing entrained air from the system. The
surge tank shall be equipped with a low coolant probe and sight glass to monitor the level of the coolant. The surge tank
shall have a cap that meets the engine manufactures pressure requirements as well as the system design requirements.
All radiator tubes shall be formed from aluminized steel tubing. Recirculation shields shall be installed where required to
prevent heated air from reentering the cooling package and affecting performance. When a center bumper compartment
is installed an additional shield may be required to redirect the airflow into the coolers.
The charge air cooler shall be a cross-flow design constructed completely of aluminum with welded side tanks. The
charge air cooler shall have a minimum of a 390 square inch core and be bolted to the top of the radiator to allow a single
depth core, thus allowing a more efficient and serviceable cooling system.
All charge air cooler tubes shall be formed from aluminized steel tubing and installed with silicone hump hoses and
stainless steel “constant torque” style clamps meeting the engine manufactures requirements.