Pump Flow and Pressure

NOTE: Before carrying out the pump flow and pressure test, complete the Inspection and Verification procedures.

1. Disconnect the power steering high-pressure tube between the power steering pump and the steering gear.
^ Allow the fluid to drain into a suitable container.

2. Using the special tool D87C-33610-A, attach the power steering analyzer in line of the high-pressure tube.
3. Attach a suitable digital tachometer to monitor rpm of the power steering pump.
4. Place a suitable thermometer in the power steering reservoir.

CAUTION: Make sure the valve on the power steering system analyzer is open, allowing the system to function normally.

5. Fill the power steering reservoir to the MAX mark.
6. With the engine running, raise the fluid temperature to 74°-79° C (165°-175° F) by turning the steering wheel stop to stop several times.

CAUTION:
^ Do not leave the valve on the power steering analyzer closed for more than five seconds.
^ Do not hold the steering wheel against a stop for more than three to five seconds at a time, as damage to the power steering pump may result.

7. Record the following:
^ Minimum pump flow liters/minute (gallons/minute) at 74°-79° C (165°-175° F).
^ System back pressure kPa (psi) at 74°-79° C (165°-175° F) at idle with the gate valve fully open.

8. Partially close the gate valve to build up the pressure to 5100 kPa (740 psi). Observe and record the minimum pump flow liters/minute (gallons/minute) at 74°-79° C (165°-175° F).
9. Increase the pump speed to approximately 2500 rpm. Observe and record the minimum pump flow, liters/minute (gallons/minute).
10. Compare the results with those listed in the Power Steering Pump specifications. If the pressure recorded is lower than the minimum specification listed, install a new power steering pump.