Tools Required

The J 26487-C tool set includes the following components:

Important: The steering gear has end limiter valves (end limiters) which provide an increase in steering effort at a point within 1/3 turn of the axle stop contact. This is normal operation.

1. Place a container under the steering gear or pump in order to catch the fluid when disconnecting or connecting the hoses.
2. Clean the surface of the steering gear at the control valve.
3. Disconnect the pressure quick connect fitting at the power steering bulkhead.
4. Connect the analyzer hoses to the adapters.
5. Bleed the power steering system. If the analyzer has never before been used, ensure that the analyzer valve gate remains open during the bleeding procedure. Refer to Power Steering System Bleeding .

Important: Throughout the following testing procedure, the letters in parentheses indicate specific pressures and flows.

Document the values of the pressures and the flows. Use the letters in parentheses as references for comparing the values.
6. Run the engine at idle speed with the gate valve open.

Record the flow (A) and the pressure (B).

•	If the flow is less than 2 gpm, the pump may need repair. Continue the test.

•	If the pressure is above 1 379 kPa (200 psi), inspect the hoses for any restriction.

7. Partially close the gate valve in order for pressure to build to 4 827 kPa (700 psi) of pressure. Record the flow (C).
8. Compare the values of flow (A) and flow (C).

If flow (C) drops more than 1  gpm under flow (A) then:

9. Replace or rebuild the pump. Refer to Power Steering Pump Replacement .
10. Replace the following components:

•

The ring

•

The rotor

•

The vanes

•	The O-ring seals

11. Complete the following steps in order to obtain the pressure value (D):

11.1.

Do not close the gate valve for more than five seconds.

Partially open the gate valve.

11.2.

Close and partially open the valve two more times.

11.3.

Observe and record the pressure (D) each time that the gate is closed.

•	If the recorded pressures (D) are 690 kPa (100 psi) lower than the specified pressures, than replace the pump flow control valve.

•	If the pressures (D) are greater than the low specifications and vary from each other by more than 690 kPa (100 psi) then remove and clean the pump flow control valve.

•	Inspect the pump flow control valve bore for dirt or foreign materials. Clean the pump flow control valve bore.

•	Inspect the system fluid for contamination. If the fluid is contaminated, disassemble and clean the steering gear and the pump before assembly.

12. Increase the engine speed from idle to approximately 1500 RPM.
13. Compare the values of flow (A) and flow (E).

Record the flow (E).

Complete the following steps if flow (E) varies by more than 1 gpm from flow (A).

•	Remove and clean the pump flow control valve.

•	Inspect the pump flow control valve bore for dirt or foreign materials. Clean the pump flow control valve bore.

•	Inspect the system fluid for contamination. If the fluid is contaminated, disassemble and clean the steering gear and the pump before assembly.

Notice: Do not hold the steering wheel in the full turn position longer than five seconds. To do so may damage the power steering pump.

Important: It is necessary to use a non-hardened 1.3 cm (0.5 inch) steel spacer on the TRW Ross® power steering gear.

14. Have an assistant lightly turn the steering wheel into the left steering stop and then the right steering stop.

Use a long handle to hold the spacer in place in front of the steering stops. This action will prevent pressure relief poppets from tripping.

15. Record the pressure and the flow (F).

Verify that the following conditions exist:

•	The pressures measured at the steering stops are close in value to the maximum pump output (D)

•	The flow drops below 1 gpm.

•	If the above conditions do not exist, the steering gear is leaking internally. Repair the steering gear.

16. Perform the following actions simultaneously:

•	Have an assistant turn the steering wheel slightly in both directions and then quickly release the wheel.

•	Observe the pressure gage.

•	Under normal conditions, the needle will move from the normal back pressure reading and snap back when the wheel is released. A slow or sticking needle indicates a sticking rotary valve in the steering gear.

17. Complete the following steps if the pressure gage needle moves slowly or sticks:

•	Remove the rotary valve.

•	Disassemble and clean the rotary valve.

•	Inspect the system oil for contamination. If the system oil is contaminated, disassemble and clean the following components:

-

The gear

-

The pump

•	Refer to the appropriate procedure:

•	Power Steering Pump Replacement .

•	Power Steering Pump Disassemble .