Pump Flow and Pressure Test
Pump Flow and Pressure TestWARNING: The power steering analyzer will become hot during testing, do not touch the analyzer with bare hands. Failure to follow this instruction may result in personal injury.
NOTE: Before carrying out the pump flow and pressure test, complete the Inspection and Verification.
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. Connect the car power steering analyzer kit 211-D001 in line with the high-pressure tube.
3. Attach the digital tachometer.
4. Fill the reservoir to the MAX mark.
5. Place the dial thermometer in the power steering pump reservoir.
6. CAUTION: Make sure the valve on the power steering analyzer is open allowing the system to operate normally.
CAUTION: Do not hold the steering wheel against the stops for more than five seconds, as damage to the power steering pump may result.
Start the engine and raise the fluid temperature to 74° - 79°C (165° - 175°F) by turning the steering wheel from lock to lock.
7. NOTE: If the system back pressure is greater than 1034 kPa (150 psi) check the hoses for restrictions.
Record the following, with the engine at idle and the gate valve fully open:
^ Minimum pump flow liters/minute (gallons/minute) at 74° - 79°C (165° - 175°F).
^ System back pressure kPa (psi) 74° - 79°C (165° - 175°F) with the gate valve fully open.
8. CAUTION: Do not leave the valve on the power steering analyzer closed for more than five seconds, as damage to the power steering pump may result.
Partially close the gate valve to build the pressure up to 5100 kPa (740 psi). Observe and record the minimum pump flow liters per minute (gallons per minute) at 74° - 79°C (165° - 175°F).
9. Completely close and partially open the gate valve three times, record the pressure kPa (psi).
10. Fully open the gate valve, increase the pump speed to 2500 rpm. Record the pump flow liters per minute (gallons per minute).
11. Turn the steering wheel to the left and right stops and record the pressure kPa (psi) and flow and flow liters per minute (gallons per minute) at 74° - 79°C (165° - 175°F).
^ Pressured developed at both stops should be nearly the same as maximum pressure output pressure. At the same time flow should drop below 1.9 liters a minute (0.5 gallon per minute).