The hydraulic block or hydraulic distributor, receiving signals from the electronic control unit, switches channels in the control valve block and controls the clutch engagement pressure
Depending on the signal, one or another solenoid is activated, and the liquid flowing through the channels of the distributor acts on the corresponding clutch mechanism.
The control valve (Fig. 1) consists of upper and lower solenoid valve housings, separator plates, gaskets, pressure control solenoid valve, torque converter lock-up solenoid valve and sequential shift solenoid valves.
The location of the solenoid valves on the automatic transmission hydraulic distributor: 1 - pressure control valve; 2 - torque converter blocking valve; 3 - solenoid valve No. 4 of the gear shift sequence; 4 - solenoid valve No. 3 of the gear shift sequence; 5 - solenoid valve No. 1 of the gear shift sequence; 6 - solenoid valve No. 2 of the gear shift sequence; 7 - solenoid valve No. 6 of the gear shift sequence; 8 - solenoid valve No. 5 of the gear shift sequence
Repair of the valve body consists of replacing worn valves, seals on the solenoids, flushing the valve body.
We discussed the removal of the hydraulic distributor in the article - "Disassembly of the automatic transmission DPO(AL4)»
Be especially careful when working on the control valve body as it contains a large number of precision parts.
When removing, arrange the parts in a certain order so as not to mix them up.
Clean the removed parts with solvent and dry them with compressed air.
Clean all openings and channels with compressed air.
After removing the distribution unit, disconnect the wiring harness from the valves (Fig. 2)
We unscrew the ten screws securing the bottom cover of the unit (Fig. 3) and remove it.
Remove the control rod (Fig. 4).
Turn over the hydraulic unit and unscrew the seven screws of the upper cover of the unit (Fig. 5), and remove it.
We take out the pressure control solenoid valve 1 (Fig. 6), and the torque converter lock-up solenoid valve (2).
Remove the upper housing of the control valves (Fig. 7)
Remove the plate separator (Fig. 8)
We unscrew the screws securing the solenoids and remove the solenoids (Fig. 9)
Remove the rods and springs (Fig. 10)
After disassembly, the block and all parts of the hydraulic distributor are washed. We replace seals and defective parts.
Assemble the block in reverse order.