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 power steering fluid, if required. Start the engine, make sure transmission is in PARK and the parking brake is engaged and run engine for approximately two minutes at idle.

NOTE: The vehicle must not be moving during the following checks.

5. Record the following:
a. Flow, liters/minute (gallons/minute) at 78 +/-2°C (172 +/-5°F).
b. Pressure, kPa (psi) at 78 +/-2°C (172 +/-5°F) at idle with the gate valve fully open.
^ If flow is below 7.5 liters/min. (2.0 gallons/minute), the power steering pump may require service. However, at this point, continue the diagnosis. Check for flow and relief pressure against the vehicle and engine being tested.
^ If pressure is above 1034 kPa (150 psi) check hoses for restrictions.
6. Partially close the gate valve to build up 5100 kPa (740 psi). Observe and record flow (liters/minute) (gallons/minute) at 78 +/-2°C (172 +/-5 °F).
^ If flow drops below 5.7 liters/minute (1.4 gallons/minute), replace power steering pump.
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). Pressure specification should maintain a current pressure between 8275-9653 kPa (1200-1400 psi) minimum to maximum. If the pressure recorded is lower than the minimum specification listed, replace the power steering pump.
^ If the pressure recorded is above the maximum specification listed, replace power steering pump.
8. Increase the engine speed from idle to approximately 1500 rpm. Observe and record flow, liters/minute (gallons/minute).
^ If flow exceeds the maximum free flow specification, replace the power steering pump.
9. Check idle speed and set if necessary. With the engine at idle, turn (or have an assistant turn) the steering wheel to the right and left stops. Record the pressure and flow at stops.
^ Pressure developed at both stops should be nearly the same as the maximum pump output pressure.
^ At the same time, flow should drop below 1.9 liters/minute (0.5 gallon/minute). If pressure does not reach maximum output or flow does not drop below 1.9L/minute (0.5 gallon/minute) excessive internal leakage is occurring. Remove and disassemble the steering gear. Replace damaged or broken parts. Pay particular attention to the piston seals for damage.
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. If it comes back slowly or sticks, either the rotary valve in the steering gear is sticking or steering column is binding. Check the steering column before replacing the steering gear.
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 is above the maximum specification listed, the flow control valve in the power steering pump should be removed and replaced.

MINIMUM PUMP FLOW
If the flow drops to a level lower than the value in the power steering pump specification chart, replace the power steering pump. If flow exceeds the maximum free flow specified in the chart, the flow control valve in the power steering pump should be removed and replaced.

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

INTERNAL LEAKAGE TEST
If the pressure does not reach maximum output or flow does not drop below 1.9 liters/minute (0.5 gallons/minute), excessive internal leakage is occurring. Remove and disassemble steering gear.