Procedure

1. To connect the analyzer into the steering system, remove the pressure fitting from the power steering pump and connect it into the appropriate adapter of the analyzer.
2. Thread the other adapter of the analyzer into the power steering pump.
3. Connect the analyzer to the adapters. Tighten both connections to 20 Nm (15 ft. lbs.) maximum.
4. Add specified power steering fluid to the power steering pump if required. Start the engine and run it for approximately two minutes at idle.
5. Record the following:
a. Minimum pump flow liters/minute (gallons/minute) at 78 ±2 °C (172 ±5 °F)
b. System Back Pressure kPa (psi) at 78 ±2°C (172 ±5°F) at idle with the gate valve fully open
6. Partially close the gate valve to build up 5100 kPa (740 psi). Observe and record minimum pump flow liters/minutes gallons/minutes) at 78 ±2°C (172 ±5°F).
7. Completely close and partially open the gate valve three times. (Do not allow the valve to remain closed for more than five seconds.) Observe and record pressure, kPa (psi).

NOTE: Refer to the specifications chart for the pressure specification. If the pressure recorded is lower than the minimum specification listed, replace the flow control valve in the power steering pump.

8. Increase the engine speed from idle to approximately 1500 rpm. Observe and record minimum pump flow, liters/minute (gallons/minute).
9. With the engine at idle, turn (or have an assistant turn) the steering wheel to the left and right stops. Record the pressure and flow at stops.

NOTE: Pressure developed at both stops should be nearly the same as maximum power steering pump output pressure. At the same time, flow should drop below 1.9 liters/minute (0.5 gallon/minute).

10. Turn (or have an assistant turn) steering wheel slightly in both directions and release quickly while watching the pressure gauge. The needle should move from the normal back pressure reading and snap back as the steering wheel is released.

NOTE: If it comes back slowly or sticks, either the rotary valve in the power rack and pinion steering gear is sticking or the steering column is binding. Check the steering column before replacing the steering gear valve. Remove, disassemble and clean the rotary valve. If the system is severely contaminated, the gear hoses, control valve, and power steering pump must be completely disassembled and cleaned before reassembly.

11. Disconnect and remove analyzer and connect lines.

SYSTEM BACK-PRESSURE
^ If pressure is above 1034 kPa (150 psi), check hoses for restrictions.
^ If the pressure recorded is above the maximum specification listed, the power steering pump should be replaced.

MINIMUM PUMP FLOW
^ If flow drops to a level lower than the value in the Power Steering Pump Specifications chart, replace the power steering pump.
^ If flow exceeds the maximum free flow specified in chart, the power steering pump should be replaced.

RELIEF PRESSURE
If flow is below 6 liters/minute (1.6 gallons/minute), the power steering pump may require service. However, at this point continue the diagnosis. Refer to Specifications for flow and relief pressure for the engine being tested.

INTERNAL LEAKAGE
If the pressure does not reach maximum output or flow does not drop below 1.9 liters/minute (0.5 gallon/minute), excessive internal leakage is occurring. Replace power steering pump.