TM 10-4320-344-24Figure 1-5. Fuel System Functional Block Diagram.1.15.3 Control Panel.Controls pump and engine operations. For an illustration anddescription 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 theengine speed is controlled by the pressure regulator for the model 609-A and processcontrollers and process devices for Models 609-C and US636HCCD-1. The pressureregulator, process controller, and controlling devices monitor the suction pressureof the water pump and control engine speed through the engine governor. When thepump 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 CentrifugalPump.The pumping assemblies have the capability of pumping up to600 GPM at up to 350 feet total discharge head (TDH). The pump is driven by adirect coupling between the flywheel of the diesel engine and the intermediatebracket assembly.1.15.4.1 Pump Casing.The pump casing is a solid cast metal housing to which theintermediate bracket assembly and suction and discharge elbows are mounted. Theimpeller from the intermediate bracket assembly is fitted in the rear of the pumpcasing. As the impeller rotates, a vacuum is created which draws water in throughthe suction elbow,The water is then slung through the impeller and out through thedischarge elbow.1.15.4.2 Intermediate Bracket Assembly Housing.The intermediate bracket assembly is theinterface between the diesel engine and pump casing. The intermediate bracketassembly consists of an impeller, impeller shaft, sealed self-lubricating ballbearings, cast metal housing, and flexible coupler. The flexible coupler, mountedon the end of the impeller shaft, is fitted in or over mounting devices attached tothe fly wheel of the diesel engine. As the engine operates the flywheel rotates ina clockwise direction. The flexible coupler and thus the impeller shaft alsorotates in the clockwise direction. The sealed self-lubricating ball bearingsprovide support and spinning capability to the impeller shaft. The impeller ismounted on the end of the impeller shaft, opposite of the flexible coupler, and islocated inside the pump casing when installed in the pumping assembly. The castmetal 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 haverear lights, an inertia-actuated hydraulic braking system, manually operated parkbrakes and leveling jacks, and safety chains.1-10
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