Idling Device and Throttle Control

TM 5-4240-501-14&P Idling Device and Throttle Control (Two Piece Flo-Jet) A manual friction control may be used to limit throttle movement, to any pre-set position. It is commonly used for two purposes. 1. To return the throttle to a "no-load" position on a pump, generator, etc.; 2. For cold weather starting on governed idle engines. The throttle can easily be kept in a "near closed" position, while starting, which is most favorable for cold weather starts. Fig. 97. Fig. 97 - Idling Device and Throttle Control Remote Throttle Control (Two Piece Flo-Jet) The remote throttle control opens the carburetor throttle until the full governed speed is obtained, at which point the governor takes over control of the throttle. At any point below the governed speed, the throttle is held in a fixed position and the engine speed will vary with the load. Fig. 98. Fig. 98 - Remote Throttle Control CARBURETION Cross-Over Flo-Jet CROSS-OVER FLO-JET The cross-over Flo-Jet carburetor is used on Model Series 253400 engines and is a float type carburetor with idle and high speed adjustment needles. This carburetor also has an integral fuel pump. All adjustments can be made from the top of the carburetor, Figs. 99 and 100. Fig. 99 Fig. 100 Disassembly, Cross-Over FIo-Jet Remove idle and high speed needle adjustment valves. Remove float bowl mounting screw, washer and float bowl. Using a large blunt screw driver, remove nozzle screw. Remove float hinge pin, float and float inlet needle. Use screw driver to remove two (2) screws from choke shaft. Then remove choke plate and choke shaft. Use screw driver to remove screw from throttle shaft. Then remove throttle plate and throttle shaft. Use screw driver to remove three (3) screws from fuel pump body. Remove fuel pump from carburetor taking care not to lose the pump valve springs. 27