FIFTH SPEED REVERSE - TM-5-3805-263-14P-2

FIFTH SPEED REVERSE - TM-5-3805-263-14P-2_289

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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TRANSMISSION HYDRAULIC CONTROLS SYSTEMS OPERATION TM 5-3805-263-14&P-2 FIFTH SPEED REVERSE When the selector lever is moved from FOURTH REVERSE to FIFTH REVERSE, the pilot selector valve (16) lets the signal pressure in passage (G) go to the reservoir and sends signal pressure to passage (E). When the signal pressure in passage (G) goes to the reservoir, the spring force on the speed selector spool (18) moves the spool to the left and lets the pressure oil in the passage for the No. 5 clutch (23) go to the reservoir. The signal pressure in passage (E) moves the speed selector spool (17) to the left and opens the passage to the No. 4 clutch (22) to system pressure. When the passage to the No. 4 clutch (22) is opened, system pressure has a decrease as the pressure oils fills the passage for the No. 4 clutch (22). As the No. 4 clutch fills, a decrease in pressure in passage (21) causes a decrease in pressure on the left end of the differential, check, and safety valve (15) and lets the valve move to the left. When the differential, check, and safety valve (15) moves to the left, pressure oil in the No. 2 direction clutch goes to the reservoir. The pressure oil in passage (19) also goes to the reservoir through the differential, check, and safety valve (15). A decrease in pressure in line (19) causes the load piston (32) to move to the left and the modulating reducing valve (31) to move to the right. Also, a decrease in pressure in passage (19) causes a decrease in pressure in the passage for the No. 7 clutch (37) and the clutch is now not engaged. As the passage to the No. 4 clutch (22) is filled, an increase in pressure to passage (21) moves the differential, check, and safety valve (15) to the right and closes the passage from passage (19) to the reservoir. Now the system pressure has an increase. The modulating reducing valve (31) gives the modulation to the pressure oil until the P1 pressure in the No. 4 and No. 7 clutches is at approximately 340 psi (2350 kPa) and the P2 pressure in the No. 2 clutch is at approximately 280 psi (1950 kPa) with the engine at HIGH IDLE. When the engine is at LOW IDLE, P1 pressure is approximately 310 psi (2120 kPa) and P2 pressure is approximately 250 psi (1720 kPa). The shift is now complete.

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