Elements of the steering mechanism with a servo drive
1 - pipe-shell with an upper steering shaft and a mount for the ignition lock-switch and anti-theft device; 2 - cardan joint; 3 - lower steering shaft; 4 - housing for a small steering gear and valve; 5 - steering sealing cuff; 6 - thrust of the steering trapezoid; 7 - the tip of the transverse steering rod; 8 - a cracker with a thrust ring, a pressure spring and a plug for adjusting the small steering gear; 9 - hydraulic pipelines.
Checking the actuator for tightness
If the fluid level in the servo reservoir has dropped, the steering system must be checked, otherwise the servo may fail during the trip. You will find the check sequence and which nodes you need to pay attention to in the section Trouble-shooting. Sometimes ATF can leak out of the reservoir cap o-ring (an overfilled tank, a carelessly closed lid, or excessive winding in the mountains or in tight alleyways). The loss of fluid in this case is not necessarily associated with leaks at the joints.
Removing the Servo Pump
If the power steering pump only needs to be removed for work in the engine compartment, its hoses must remain connected to prevent dirt from entering the steering hydraulics. If the pump hoses still need to be removed, then exercise extreme caution. Even the smallest particles of dirt that get into the ATF can cause a malfunction.
1. Remove the three-phase alternator, see Generator.
2. Loosen the steering servo V-belt tensioner.
3. Remove the V-belt.
4. Both hoses (supply and withdrawal) on the tank, clamp it with a clamp.
5. Remove the fastening of the discharge pipeline from the front wall.
6. At the pressure line, disconnect the plug connection from the switch.
7. Unscrew the hydraulic hoses from the pump and drain the hydraulic fluid from the pump and reservoir into a clean reservoir. Close the reservoir tightly.
8. Turn off 4 bolts of fastening of the pump.
9. Remove the pump.
10. After installing the pump, fill with ATF and bleed the system as described in the next section.
11. Put on the V-belt and tension it. At the same time, tighten the pump bolts only after the belt has been tensioned with the tensioner. At the correct tension - a reference measuring tool is used in the workshop for precise control - the belt should sag no more than 5 mm when pressed with a finger between the pulleys.
Removing air from the servo
If the servo pump or reservoir has been removed and disconnected from the hoses, the hydraulic system must be filled with new ATF.
1. Start the engine and let it idle.
2. Turn the steering wheel slowly four times from side to side until it stops and at the same time carefully add ATF to the tank until no air bubbles come out.
3. Fluid level must not drop so low that air enters the system.
4. Continue to remove air until the level of ATF in the tank stabilizes and air bubbles stop coming out.
5. Turn on the engine and check the condition of the ATF.
Note. Recommendation: before pouring into the ATF reservoir, do not shake it, as air bubbles may form, which will prevent the removal of air from the system. Therefore, ATF must be poured slowly to avoid the formation of air bubbles.