Disconnect the discharge line from the pump housing.
Pic. 5.7. Manometer for measuring the pressure of the working fluid of the hydraulic booster
Connect the pressure gauge as shown in figure 5.7.
Note. Make sure the pressure gauge valve is open.
Pump the system.
Start the engine and set the idle speed.
Turn the steering wheel one full turn two or three times to warm up the fluid.
Operating fluid temperature: 80°C.
Pic. 5.8. Checking the pressure of the working fluid with the pressure gauge valve closed
Check the pressure of the working fluid with the pressure gauge valve closed (pic. 5.8).
Minimum allowable pressure: 7845 kPa.
Note. Do not keep the tap closed for more than 10 seconds. Do not allow the operating fluid temperature to become too high.
Pic. 5.9. Checking the pressure of the working fluid with the pressure gauge valve open
Check fluid pressure with gauge valve open (pic. 5.9).
With the engine idling, open the valve fully.
Measure fluid pressure at 1000 rpm engine speed–1 and 3000 min–1.
Maximum allowable pressure difference: 490 kPa.
Note. Do not turn the steering wheel.
Pic. 5.10. Checking the pressure of the working fluid with the pressure gauge valve open and the steering wheel turned to the extreme position
Check the fluid pressure when the steering wheel is turned to the extreme position (pic. 5.10).
With the engine idling and the valve fully open, turn the steering wheel to the maximum angle.
Minimum allowable pressure: 7845 kPa.
Attention! Do not hold the steering wheel in the extreme position for more than 10 s. Do not let the working fluid temperature get too high.
Disconnect the pressure gauge.
Connect the discharge line to the pump body.
Bleed the power steering system.