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Case IH 400 Series Gasoline Tractor Supplement to Form 5689 Operator’s Manual Instant Download (Publication No.6202)
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S.pplem.at to Fona lilt Operatol"s "a.al CABm 400 S.ri.s Gasolia. Tractor Figure 1. ea.e 411 Tractor Equipped for LP Gas LP GAS EQUIPMENT oa CAB 400 Sel'ies Tl'actol's
THE APPLICATION OF LP GAS AS A FUEL FOR ENGINE USE Butane and Propane-Liquefied Petroleum Gases-are generally referred to as LP <Gas. The term is a general designation of Butane or Propane or a mix. ture of both. LP Gas, which exists in a gaseous state at normal atmospheric temperatures and pressures, is liquefied by the application of moderate pressures. When con- sidering the utilization of LP Gas for the internal combustion engine, it is welt to bear in mind that the liquid fuel under pressure is constantly striving to re- turn to its gaseous state under which it was first captured at the refinery and liqUefied. One need only crack a valve on the tank and the liquid spews out in force in much the same manner as steam is released, The liquid almost instant- ly turns into a vapor and disappears in the atmosphere. After the fuel has reached the vapor stage, the pressure must be dropped to a uniform, workable value. When LP Gas expands and vaporizes, it increases in volume very rapidly. thereby causing a refrigerating effect which would freeze up the mechanism were it not for the application of heat or a differential in temperature between the expanding LP Gas and the expansion chamber. The principle of operation, broken down into four stages for close examina- tion. are shown on the Bow diagram. Figure 2 t in the following order: I-Primary or hi.h pressure regulation. LP Gas is dropped from tank pressure (20 to 175 pounds) down to a regulated 4 to 6 pounds. 2-Application of heat to the rapidl,. expanded fuel. This function is performed by the vaporizer, a device heated by engine circulating water. 3-Low pressure re,ulation. The thoroughly vaporized and expanded LP Gas must be dropped further in pressure from the initial 4 to 6 pounds to slightly below atmospheric pressure. The low pressure regu- 2
fiLLING VALVE t ' ! n : ; : > ~ l l \ l 0 RELIEF VALVe Hor WATeR lOW PRESSURE REGUlATOR eNG!NE SHUT OFF VALVe FILTeR t . = = ~ ~ = 1 - A I R INLET RETOR TO WATER PUMP BSUIANE.PROPANE LIQUID [:JSUTANe.PROPANE VAPOR III GAS AIR MIXTURE IiENGINE COOLING WATER -FLOW DfAGRAM- 8UTANE PROPANE FUEL ENGINE APPLICATION lator or metering regulator must not only shut off the fuel a little below atmospheric pressure, preventing any leakage, but must also be so de- signed u to instantly permit vaporized LP Gas to Bow tp the carburetor and engine in metered volumes to conform automatically to every en- gine demand. 4-Carburetion. This last stage is a mixing function-mixing fuel and air-and a means for proportioning or measuring out gu and air for the right mixture strengths. Coordination between the low pressure regu- lator or metering regulator and carburetor must be perfect throughout the entire range of engine speeds and loads, from fut acceleration to wide open throttle and back to idle. Flow characteristics of the carburetor and regulator must follow very closely the engine demand. This perform .. ance must be instant and without periods of erratic over-richness or lean Bat-spot operation.
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FOR A 400 SERIES TRACTOR EQUIPPED FOR LP PREPARING THE TRACTOR FOR OPERATION Figure 3. Filling The Fuel Tank Liquid Outlet Valve To fill the fuel tank, make sure the vapor and liquid outlet valves, Figure are closed; then remove the dust cap from the liquid fill valve and connect the hose from the storage tank and fuel transfer pump. Wipe the connections dean before attaching filler hose, Vapor CAUTION Never fiUthe fuel tank when the engine is running or when near an open flame. Do not smoke when working around inflammable fuels. 4