EQUIPMENT DESCRIPTION AND DATA
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
The M1142 vehicle is a Tactical Fire Fighting Truck capable of extinguishing aircraft, petroleum, brush, wildland,
and structural fires at isolated military installations.
The M1142 is built on a modified M977A2 chassis. The modifications made to the M977A2 chassis are:
The location of the HEMTT air compressor & hydraulic pump have been reversed, in order to accept the
new Power Take Off (PTO).
Fuel tank and chassis batteries have been lowered slightly to allow room for the crew cab.
A mounting bracket has been added on front of cab for bumper turret.
Personnel cab roof has been modified to accept lightbars and turret.
Water Pump. A 1,000 GPM Darley PSE single stage pump, engine driven, centrifugal type. The pump
delivers the percentage of rated discharge at pressure indicated below. Water system controls are
labeled with black letters on a gray background.
100% of rated capacity at 150 psi (1,034 kPa) net pump pressure.
70% of rated capacity at 200 psi (1,379 kPa) net pump pressure.
50% of rated capacity at 250 psi (1,724 kPa) net pump pressure.
Pump body is fine-grained gray iron, bronze fitted. Impeller is a high strength bronze alloy accurately
balanced and splined to pump shaft for precision fit and durability. A double seal ring design helps to
minimize end thrust. Deep groove radial type oversize ball bearings are used. Bearings are protected at
the openings from road dirt and water with an oil seal and a water slinger.
Foam System (Class A & B). An "around-the-pump" foam proportioner is located on the intake side of
The foam system is plumbed to two foam tanks with a foam valve and check valve in each foam line.
A multi-metering valve arrangement is provided for discharges controlled inside the personnel cab.
Turrets and ground spray nozzles are preset for 3% AFFF for Class B foam and 1% for Class A foam.
An adjustable metering valve located on the pump operator's panel allows the operator to select the
proper setting at any flow within the operating range for the six discharges. Each discharge will be
proportioned at the same rate.
Controls for the foam system are located on the pump operator's panel and are labeled with red letters
on a white background for easy identification. Controls for eductor, foam supply, and flush, are electric
over pneumatic to allow for an ergonomically designed control panel and simplified operation.