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

g. Throttle (T) Circuit (green, yellow — fig. 2-5). The throttle (T) circuit functions as described in paragraph 2-15g. h. Inhibitor Pressure Circuit (dotted red—fig. 2- 5). In intermediate range (selector at 1-2 position), only the high-intermediate downshift inhibitor circuit is charged. It functions as described in paragraph 2-15 h. i. Lockup Clutch Circuit (blue, white—fig. 2-5). (1) The flow valve controls the lockup clutch circuit when a shift from one range to another occurs automatically or is made manually. In figure 2-5, the change can be considered as a manual change from selector position 1 to selector position 1-2, or it can be considered as an automatic upshift from 1 to 2 within selector position 1-2. (2) The downward movement of the flow valve (a (1) (c) and (d) above) releases the lockup clutch temporarily and triggers the action of the trimmer valve. The flow valve moves downward when the shift has just occurred. It will stay downward until the oncoming clutch (intermediate range) is partially pressurized. (3) When the flow valve is downward, lockup pressure is released. This is only temporary until the oncoming range clutch is filled and main pressure above and below the flow valve equalizes. (4) Main pressure below the trimmer valve quickly lifts the trimmer valve until oil escapes through the exhaust port at the left. This reduces main pressure flowing to the clutch being applied. With negligible pressure above the trimmer plug, main pressure flowing through the orifice in the bottom of the trimmer valve forces the trimmer plug upward, away from the trimmer valve. The speed of its movement upward is influenced by throttle valve (TV) pressure being faster at closed throttle (para. 2-15 f(4)). The speed of its movement likewise influences clutch apply pressure initially. The higher TV pressure is, the higher initial clutch pressure is. (5) The trimmer valve remains open (oil exhausting at left side) until the trimmer plug reaches the top of its stroke. When the trimmer plug stops, oil continues to flow upward through the orifice in the bottom of the trimmer valve. When pressure above and below the trimmer valve is equalized, spring pressure pushes the trimmer valve downward. This closes the exhaust port. Main pressure increases significantly below the flow valve to return the flow valve to its upward position and lockup pressure is restored. Main pressure is restored, at the same time, to the area above the extender valve ball. (6) When the extender valve ball is seated, further flow of oil from tbe upper area of the trimmer valve bore is prevented. Then, oil entering the bore (from main), through an orifice, forces the trimmer plug to the lower end of its bore. Then main pressure increases to full value. (7) The overall action of the trimmer is to reduce clutch apply pressure momentarily after a gear change to prevent shift shock. It does this by gradually applying main pressure at a rate which is influenced by throttle opening. The temporarily reduced main pressure allows the clutch to slip when it is initially applied. 2-17. Hydraulic System—High-Range Operation (Selector at 1-2-3 Position a. Main Pressure Circuit (red—fig. 2-6.) (1) Main-pressure circuit in high-range (selector at 1-2-3 position) is the same as that for intermediate-range (para 2-16a) except that line 4 is not charged, and the trimmer is not in operation. (2) The absence of pressure in the high- intermediate inhibitor circuit (fed by line 4) per- mits the intermediate-high blocker plug, shift valve, and shift plug to move upward. This connects main pressure, at the intermediate-high shift valve, to the high-range clutch line. (3) When tbe trimmer is not acting, the flow valve is upward and the trimmer is charged as explained in paragraph 2-15a (12) and (13), above. b. Converter-In Circuit (yellow—fig. 2-6). The converter-in circuit functions as described in paragraph 2-15b. c. Front Governor (G1) Circuit (blue, black— fig. 2-6). The front governor (G1) circuit functions as described in paragraph 2-15c. d. Rear Governor (G2) Circuit (green, black— fig. 2-6). The rear governor (G2) circuit functions as described in paragraph 2-15d, except that in- creased G2 pressure, in the absence of both in- termediate-low and high-intermediate inhibitor pressure, has shifted the transmission to high range. This occurred when G2 pressure forced the low- intermediate and intermediate-high blocker plugs, shift valves, and shift plugs upward in their bores. e. High-Range Clutch Circuit (red, green—fig. 2- 6). The high-range clutch circuit is charged by the main pressure circuit at the intermediate-high shift valve bore when the valve is in its upward position. Intermediate-range clutch pressure is exhausted through an orifice which relates the rate of disengagement of the intermediate-range clutch. f. Throttle Valve (TV) Circuit (blue, yellow—fig. 2-6) The throttle valve (TV) circuit functions as described in paragraph 2-15f g. Lockup Clutch Circuit (blue, white—fig. 2-6). The lockup clutch circuit functions as described in paragraph 2-15i 2-18. Hydraulic System—High-Range Oper- ation (Selector at 2-3 Position) a. Low-Range Locked Out (fig. 2-7). When the 2-17