TM-9-2520-254-34 Direct Support for M113 TX100-1 Transmission 2520-00-066-4240 Download

b. Converter-In Circuit (yellow—fig. 2-4). (1) The converter-in circuit functions as described in paragraph 2-14b, except for two conditions shown in figure 2-4 which differ from those shown in figure 2-3. In lockup operation, the flow of oil to converter-in line must pass through the orifice near the left side of the lockup valve. Also, the converter-in regulator valve is shown in an open position, allowing excess oil to return to the transmission sump. (2) In lockup operation, the torque converter does not require a flow of oil as great as that required during converter operation, hence the oil is directed through an orifice. When the flow to the converter is reduced, the converter-in regulator valve may open to discharge excess oil and limit the pressure in the converter-in circuit. c. Front Governor (Gl) Circuit (blue, black— fig. 2-4). (1) In low-range operation, the G1 circuit is operative (para 2-14c (1)). (2) Pressure is prevented from bleeding off past the ball check valve at the right of the manual selector valve. When governor pressure is sufficient to overcome spring pressure (plus throttle (T) pressure) above the lockup valve, it will force the lockup valve plug and valve upward. This will charge the lockup feed line. (3) At the main pressure regulator plug, pressure is exerted against the lower surface area of the plug. This tends to raise the plug. But, when the lockup valve is upward, main pressure above the plug keeps it from moving. When the lockup valve is downward (converter operation), the regulator plug moves upward to reduce main pressure as governor pressure rises. The orifice in the governor pressure line restricts flow to prevent movement of the plug being too rapid when it does move. d. Rear Governor (G2) Circuit (green, black- fig. 2-4). (1) Rear governor (G2) pressure is produced by the rear fluid velocity-type governor (para 2-2). This pressure is directed to four points and is the primary control force for all automatic upshifts and downshifts between ranges. (2) G2 pressure is directed to the lower surface areas of the low-intermediate blocker plug and the low-intermediate shift plug. This produces an upward force at each plug. The low-intermediate blocker plug is shown in its downward position, being unable to move against its spring and inhibitor pressure. The shift plug (and shift valve) are shown in their downward positions. They have not moved upward, in this instance, because throttle (T) pressure, spring pressure, and inhibitor pressure is sufficient to prevent upshift. (3) G2 pressure is directed also to the lower surface areas of the intermediate-high blocker plug and the intermediate-high shift plug. This produces an upward force at each plug. These plugs and the intermediate-high shift valve are prevented from rising by spring pressure, inhibitor pressure, and throttle (T) pressure opposing their movement. e. Low-Range Clutch Circuit (red, black—fig. 2-4). The low-range clutch circuit directs oil to the low-range clutch when the low-intermediate shift valve is downward. When the shift valve is upward, the low-range clutch exhausts through a port at the right side of the low-intermediate shift valve bore. f. Throttle Valve (TV) Circuit (blue, yellow—fig. 2-4). (1) Throttle valve (TV) pressure originates at the throttle regulator valve when the throttle is initially opened. It increases as the throttle is opened farther. This pressure is directed to areas near the upper ends of the low-intermediate and intermediate-high shift valves, to the main pressure modulating plug, and to the extender valve. (2) At the low-intermediate and intermediate. high shift valves, TV pressure exerts a downward force which retards upshifting. Thus, the more the vehicle engine throttle is opened, the later up- shifting occurs. When the valves have upshifted, TV pressure is blocked. (3) At the main regulator modulating plug, downward pressure increases main pressure by moving the main regulator valve downward. Thus, as throttle opening progresses, main pressure is boosted. (4) At the extender valve, TV pressure tends to push the extender valve downward. In figure 2-4, the valve is upward because both spring pressure and main pressure oppose downward movement. The effect of downward movement is an increase in pressure required beneath the extender valve ball to unseat it. This action influences trimmer operation (para 2-16i). (5) TV pressure actually connects into the throttle (T) pressure circuit while either the low- intermediate shift valve or the intermediate-high shift valve is downward. This connection occurs in the valve bore areas near the upper ends of the valves. Thus, there is pressure in the T pressure circuit prior to upward movement of the throttle valve to a point which connects the TV and T circuits. This pressure retards the upward movement of the lockup valve and delays lockup. However, when the low-intermediate and in- termediate-high shift valves are both upward, there can be no connection of the two circuits except at the throttle valve. g. Throttle (T) Pressure Circuit (green, yellow— fig. 2-4). (1) At approximately 5 / 8 inch of throttle opening (upward movement of throttle valve), 2-13