INTRODUCTION AND GENERAL INFORMATION

1. GENERAL DESCRIPTION.

The terms "left side" and "right side" as used below are from the rear panel facing the towbar.

1.1 INTRODUCTION. This manual contains the necessary information for the operation of the Fuel Scavenging Unit, Part Number 95470-100. (See Figure 1-2 Block Diagram).

1.1.1 FUNCTION. The fuel Scavenging Unit (FSU) consists of two parts. The Hydraulic Power Supply (HPS) and the Submersible Pump (SP). The function of this unit is to gain access to trapped fuel in earth-covered underground tanks whose pumps have failed. The FSU bypasses these inoperable tank pumps and withdraws the fluid.

1.2 DETAILED DESCRIPTION. (See Figure 1).

1.2.1 MAJOR ASSEMBLIES. The FSU consists of the following major assemblies:

1. Diesel engine.
2. Hydraulic system.
3. Electrical system.
4. Controls and indicators.
5. Base assembly.
6. Housings.
7. Submersible pump.
8. Hose reel.

1.2.2 DIESEL ENGINE. The HPS contains a 3-cylinder, 4-cycle, diesel engine that supplies all power requirements. During normal operation, the diesel engine runs at 2300 RPM. Diesel engine speed is held constant under fluctuating loads by a variable speed closed linkage mechanical governor (also see engine TO 38G1-108-3).

1.2.3 HYDRAULIC SYSTEM. A fluid reservoir with a capacity of 50 U.S. gallons feeds the hydraulic pump, which is coupled to the diesel engine. Piping, tubing, and fittings route hydraulic fluid through a high pressure filter, to the HPS outlet port. External hoses (high pressure, and return) are used to connect the HPS to the submersible pump. Check valves prevent damage to hydraulic system components. A pressure compensator and relief valves allow control of hydraulic pressure. A pump volume control on the hydraulic pump controls hydraulic fluid flow.

1.2.4 ELECTRICAL SYSTEM. One 12 volt heavy duty maintenance free battery power the 12 VDC electrical system. During initial startup of the HPS, battery current is switched to a starter motor to crank the diesel engine. During operation, alternator current is used to power various lights, controls, and indicators used the HPS and keeps the batter y fully charged.

1.2.5 CONTROLS AND INDICATORS. All controls and indicators are mounted on the instrument control panels. Controls and indicators are accessible through the cover panel access door.

1.2.6 BASE ASSEMBLY. Support and mobility for the HPS is provided by the base assembly. The base is of welded steel construction. Four steel roller bearing wheels are attached to independently suspended spindles. Cushion tread rubber tires are integral to the wheels. A lunette eye welded to a pivotal towbar is used to hitch the FSU to a prime mover (not supplied). A knuckle-type front end steering mechanism is controlled by lateral movements of the towbar and enables high maneuver ability. Expanding-shoe type brakes, controlled by a handbrake lever allow the two rear wheels to be locked. Tiedown rings at each corner of the chassis allow unit tiedown and forklift channels for lifting.

1.2.7 HOUSING. Hinged panels on the cabinet permit access to all internal components. An instrument panel cover protects the controls when the FSU is not in use.

1.2.8 SUBMERSIBLE PUMP. The submersible pump is lowered into the underground fuel storage tank and powered from the HPS to enable full recovery of all trapped fuel in a disabled tank. It has a capacity to withdraw 300 gallons per minute.

1.2.9 HOSE REEL. The hose reel assembly consists of two 175 foot hoses. One of the hoses supplies hydraulic fluid under high pressure to operate the submersible pump and the other returns the fluid at low pressure back to the FSU reservoir after it exits the pump. Each hose consists of two parts, 140 feet of hose that is outside the fuel tank and this hose connects to an additional 35 feet of hose that is inside the tank in the fuel.

1.3 LEADING PARTICULARS. See Table 1-1.

1.3.1 SPARE PARTS (INITIAL). See Table 1-2. The spares box is located beside the engine on the fuel tank side.

1.3.2 CONSUMABLES. See Table 1-3.