Component Tests and General Diagnostics
HYDRAULIC FLOW AND PRESSURE TEST
Special Tools:
The following procedure is used to test the operation of the power steering system on this vehicle. This test will provide the gallons per minute (GPM) or flow rate of the power steering pump along with the maximum relief pressure. Perform this test anytime a power steering system problem is present. This test will determine if the power steering pump or power steering gear is not functioning properly. The following test is performed using the (6815) (with appropriate hoses) and Adapters from (6893A). Tools and Equipment
1. Check power steering belt to ensure it is in good condition and adjusted properly.
2. Assemble Power Steering Analyzer as follows:
a. Gauge end (inlet) of (6800) (3) - (6905) (6), (6713) (4), (6844) (5)
b. Valve end (outlet) of Flow Meter And Gauge (6800) (3) - (6959) (1), (6826) (2)
3. Unthread pressure hose tube nut at power steering pump.
4. Connect (6844) to pressure fitting on power steering pump. Tighten tube nut to specifications. [1][2]Specifications
5. Connect power steering pressure hose to Adapter Fitting (6826). Tighten tube nut to specifications [1][2]Specifications.
6. Open Analyzer test valve completely.
7. Start engine and allow to idle long enough to circulate power steering fluid through Analyzer flow meter and hoses.
8. Shut off engine and check fluid level; add fluid as necessary. Repeat Step 7 and Step 8 until air is bled from system.
9. Start engine and allow to idle.
10. The Analyzer gauge should read below 2068 kPa (300 psi). If above, inspect hoses for restrictions and repair as necessary. The initial pressure should be in range of 689-1896 kPa (100-175 psi). The flow meter should read above 5.7 LPM (1.5 GPM).
CAUTION:
The following test procedure step involves testing maximum pump pressure output and flow control valve operation. Do not leave valve closed for more than five seconds as the pump could be damaged.
11. Close flow meter valve fully three times and record highest pressure indicated each time. All three readings must be above specifications and within 690 kPa (100 psi) of each other.
- If power steering pump pressures are above specifications, but not within 690 kPa (100 psi) of each other, replace power steering pump.
- If pressures are within 690 kPa (100 psi) of each other, but are below specifications, replace power steering pump.
If the power steering pump requires replacement, Power Steering Pump - Removal.
CAUTION:
During the next step, do not force the pump to operate against the stops for more than 5 seconds at a time as pump damage may result.
12. Completely open the valve on the Power Steering Analyzer flow meter. Turn the steering wheel to the extreme left until the stop in the steering gear is met, then turn the steering wheel to the right until the right stop is met. Record the highest indicated pressure at each position. Compare the recorded readings to the specifications. If the highest output pressure reading against one stop is not within 690 kPa (100 psi) of the highest reading at the other stop, the steering gear is leaking internally and must be replaced.
If the power steering gear requires replacement Steering Gear - Removal.
PUMP SPECIFICATIONS
