2022.3-0000010 OM
1 – fork, 2 – hood, 3 – sphere, 4 – spring, 5, 7 – pins, 6, 10 – levers, 8, 12 – covers, 9 – shaft, 11 – sector, 13, 17 – keys, 14 – ball lock, 15 – nut, 16 – bolt, 18 – case; 19 – bracket. Figure 3.3.5 – Range shifting mechanism 3.3.3.4 Mechanism of switching between the higher and the lower passes of the gearbox reduction unit The mechanism of switching between the higher and the lower passes of the gearbox reduction unit is mounted on the shifting mechanism cover and consists of “L-H” range controlling cylinder 11 (figure 3.3.6), mounted on the center 10, a double-end 14, a lever 18 mounted on the a shaft 5. A fork 16 is connected with the lever 18 by means of a pin 17. The lever of the shaft 5 engages the carrier of the fork 3 (figure 3.3.2) and as the shaft turns it moves the clutch of the synchronizer 14. The position of the shaft 18 (figure 3.3.6) is adjusted by changing the length of the double-end bolt 14 with further locking with the nut 13. The cylinder 11 is connected to the hydraulic system by means of the valve of the hydraulic valve group 7. The switch 6 connects the valve of the hydraulic valve group 7 to the electric circuit only when the speed shifting lever is in neutral position. A retracted position of the cylinder 11 rod corresponds to the lower “L” pass of the gearbox reduction unit. The pressure sensors 8 serve to index the engagement of the reduction unit passes. ATTENTION: IF DURING OPERATION MALADJUSTMENT OF THE CYLINDER CONTROL ELEMENTS OCCURS OR THE SYNCHRONIZER ON THE SECONDARY SHAFT IS TURNED ON IMPROPERLY (HIGHER OR LOWER PASSES “L-H” OF THE REDUCTION UNIT), THEN IT IS REQUIRED TO CARRY OUT CYLINDER ADJUSTMENT! To adjust the cylinder 11 (figure 3.3.6) proceed as follows: - move the piston inside the cylinder until it stops. - turn the shaft 18 contraclockwise, having engaged the step-down range of the gearbox reduction unit; - turn the double-end bolt 14 by 8-9 revolutions, lock with the nut 13; - turning the fork 16 in or out, bring the holes in the lever 18 and in the fork 16 in coincidence, lock with the nut 15; - turn the lever 18 clockwise, having engaged the higher pass of the gearbox reduction unit; - protract the cylinder 11 rod, bring the holes in the lever 18 and the fork 16 into coincidence. - join the lever 18 and the fork 16 by means of the pin 17, mount the washer and forelock; - screwing the bolt 20 in or out, stop the spherical part of the bolt against the lever 18, lock with the nut 19. 89
