Hydraulic System Test

1. Disconnect high pressure line at steering gear and install power steering system tester tool No. SA9134C or equivalent.
2. Open gate valve on power steering system tester.
3. Run engine until it has reached normal operating temperature. Replace any power steering fluid lost during tester installation, then bleed system if necessary.
4. With engine idling, record pressure and flow rate. If the pressure reading is greater than 150 psi, stop engine and check power steering lines for restrictions. Do not turn steering wheel while performing this test.
5. Slowly close gate valve until 700 psi is indicated on the power steering tester. Record pressure and flow rate.
6. Flow rate should not drop more than 1 gallon per minute from flow rate recorded in step 4.
7. If flow rate drops more than 1 gallon per minute, replace ring, rotor and the vanes in the pump. Also inspect pressure plate and thrust plates for wear.
8. Completely close and open gate valve three times. Do not close gate valve for more than five seconds at a time. Record fluid pressure each time the valve is closed.
9. If all three readings are not within 50 psi, replace flow control valve.
10. With gate valve open, increase engine speed to 1600 RPM and record fluid pressure and flow rate. Do not turn steering wheel.
11. Flow rate should not vary more than 1 gallon per minute from the flow rate recorded in step 4.
12. Ensure flow control valve moves freely in pump housing. Inspect valve for burrs.
13. Turn steering wheel completely to left, then completely to right. Record fluid pressure and flow rate at each stop.
14. If flow rate is greater then 1 gallon per minute, steering gear is leaking internally and must be replaced.