A Lexus 300 car, the engine for the 3VE-FE type, transmission for the A540E type. Repair failure: 1 block jump 2 block, obviously feel the shock, shock. While the other gear is no such feeling, can only see the engine tachometer pointer beating about. According to the owner to reflect, this transmission has just overhauled, mileage is still less than 1600km. Overhaul for the overhaul package accessories, the circuit board is also decomposed cleaning. Just after the repair some signs of failure, more and more obvious recently.
    The automatic transmission of the car is developed by Toyota, a pre-drive four-block electronic control automatic transmission, with a lock with the clutch speed controller, three planets row Simpson four-stage planetary gears, electro-hydraulic control system, Main reducer and differential. This automatic transmission is characterized by: three planets and 10 shift components are all mounted on a shaft, speeding planets arranged in front and rear row of the rear row of planets, transmission to the planetary gears by the speed of the planetary gear ring gear On the output gear to the main reducer drive shaft.
    In order to troubleshoot, the maintenance personnel first adjusts the throttle pull line and does not respond. Its shift solenoid valve power, let it into the full hydraulic shift state, there is no response. Suspected of its internal may be faulty, then lift the transmission disintegration to check. In the 1 block jump 2 block, the shift component of the work is: low block one-way clutch release, 2 block one-way clutch work, 2 block brake combination. In addition, the direct one-way clutch, direct clutch, forward clutch in 1,2 block has been working. After inspection, the clutch inside the clutch plate, brake pads, brake pads are intact. Focus on the shift to participate in the work of the two one-way clutch, no error on the assembly, one-way can also be locked. Check the second block of the brake and found a thick piece of flange (steel) installed anti, the gap is too small. So that may be due to the gap is too small to make it too fast, resulting in shifts when the shock, shock. Re-install the adjustment of a good gap, installed after the test, the fault still exists.
    Because the internal everything is normal, and from the fault phenomenon analysis, such as the shift when the connection too fast reason. So, remove the circuit board. First check the accumulator, found that "O" ring intact, the piston and the cylinder wall is not the card or wear marks, spring stretch is also enough. And then check the 2 block shift oil, from the 1,2 block valve to 2 block brake piston piston oil circuit, did not find a shift to improve the quality of the one-way throttle.
    Under normal circumstances, one-way throttle (ball valve) arranged in the shift valve to the shift actuator in the oil, its role is to shift to the implementation of the components of the hydraulic oil throttle effect. In the gearshift actuator when the delay to increase the speed of oil pressure to reduce the shift shock; in the shift actuator separation, the shift actuator does not produce throttle effect to speed up the discharge, so that The shift actuator is quickly separated. When the ball valve is closed during oil filling, the hydraulic oil can only pass from the orifice next to the ball valve, slowing down the oil filling process; when the oil valve opens, the oil return process is accelerated.
  Look at the above oil path, did not find the ball valve, but there is a oil, whether from the oil to the direction, or from the structure of the oil circuit, there should be a ball valve. Check the information, so there is a ball valve - one-way throttle. Obviously, the valve throttle valve ball has been lost, so accompanied by a φ5mm ball. Replacement after the test, the phenomenon disappeared.
    In the decomposition of automatic transmission transmission circuit board, if the oil ball in a ball or other small parts out, because the shape of the oil is very complex, often because of these small parts can not find the original location and can not be properly installed, resulting in repair After the transmission works abnormally. According to my experience, can take preventive measures. The specific approach is: in the decomposition, when you need to pick up the oil circuit board, in order to prevent the above ball and other small parts fall, should be between the upper and lower circuit boards and iron plate on the pick up together , And put the oil on the oil circuit side up and then remove the iron plate. So that the ball and other small parts in its original position, it will not be chaotic.