TM 10-4320-344-24
Figure 1-5. Fuel System Functional Block Diagram.
1.15.3 Control Panel.
Controls pump and engine operations. For an illustration and
description of the controls and indicators, refer to TM 10-4320-344-10, Chapter 2,
Section I. When the pumping assemblies are run in the electric automatic mode the
engine speed is controlled by the pressure regulator for the model 609-A and process
controllers and process devices for Models 609-C and US636HCCD-1. The pressure
regulator, process controller, and controlling devices monitor the suction pressure
of the water pump and control engine speed through the engine governor. When the
pump suction pressure drops below 10 pounds per square inch (psi) (69 kilopascal
(kPa)) the engine is reduced to idle speed to prevent damage to the equipment.
Engine speed is also reduced to idle when the suction pressure rises above 120 psi
(827 kPa) to prevent damage to the equipment.
1.15.4 Centrifugal Pump.
The pumping assemblies have the capability of pumping up to
600 GPM at up to 350 feet total discharge head (TDH). The pump is driven by a
direct coupling between the flywheel of the diesel engine and the intermediate
bracket assembly.
1.15.4.1 Pump Casing.
The pump casing is a solid cast metal housing to which the
intermediate bracket assembly and suction and discharge elbows are mounted. The
impeller from the intermediate bracket assembly is fitted in the rear of the pump
casing. As the impeller rotates, a vacuum is created which draws water in through
the suction elbow,
The water is then slung through the impeller and out through the
discharge elbow.
1.15.4.2 Intermediate Bracket Assembly Housing.
The intermediate bracket assembly is the
interface between the diesel engine and pump casing. The intermediate bracket
assembly consists of an impeller, impeller shaft, sealed self-lubricating ball
bearings, cast metal housing, and flexible coupler. The flexible coupler, mounted
on the end of the impeller shaft, is fitted in or over mounting devices attached to
the fly wheel of the diesel engine. As the engine operates the flywheel rotates in
a clockwise direction. The flexible coupler and thus the impeller shaft also
rotates in the clockwise direction. The sealed self-lubricating ball bearings
provide support and spinning capability to the impeller shaft. The impeller is
mounted on the end of the impeller shaft, opposite of the flexible coupler, and is
located inside the pump casing when installed in the pumping assembly. The cast
metal housing is bolted to both the pump casing and the diesel engine for support.
1.15.5 Two-Wheeled Trailer Assembly.
Transports pump and engine unit. All models have
rear lights, an inertia-actuated hydraulic braking system, manually operated park
brakes and leveling jacks, and safety chains.
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