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Power Steering Pressure Test






CHECKING FOR NORMAL FUNCTION
Test of fluid pressure in the power steering system is performed to determine whether or not the oil pump and power steering unit are functioning normally.

The power steering system test is a method used to identify and isolate hydraulic circuit difficulties. Prior to performing this test, the following inspections and corrections, if necessary, must be made.
- The pump reservoir for the proper fluid level.
- The pump belt for proper tension.
- The pump driver pulley condition.

PROCEDURE
1. Place a container under the steering gear or pump to catch the fluid when disconnecting or connecting the hoses.





2. With the engine off, disconnect the pressure hose at the steering gear or power steering pump and install power steering tester to both hoses.

NOTE: The gage must be between the shutoff valve and pump. Open the shutoff valve. Attach the J-29877-A tester and a J-39213 adapter.

3. Remove the filler cap from the pump reservoir and check the fluid level. Fill the pump reservoir with power steering fluid, to the "Full" mark on the dipstick. Start the engine and, momentarily holding steering wheel against stop, check the connections at tester for leakage.
4. Bleed the system.
5. Start the engine and check the pump's fluid level. Add power steering fluid if required. When the engine is at normal operating temperature, increase engine speed to 1500 rpm.

CAUTION: Do not leave shutoff valve fully closed for more than 5 seconds, as the pump could become damaged internally.

6. Fully close the shutoff valve. Record the highest pressures and:
- If the pressure recorded is within 9,316 - 9,807 kPa (1,351 - 1,420 psi), the pump is functioning within its specifications.

- If the pressure recorded is higher than 9,807 kPa (1,420 psi) the valve in the pump is defective.

- If the pressure recorded is lower than 9,316 kPa (1,351 psi), the valve or the rotating group in the pump is defective.

7. If the pump pressure is within specifications, leave the valve open and turn (or have someone else turn) the steering wheel fully in both directions. Record the highest pressures and compare with the maximum pump pressure recorded in step 6. If this pressure cannot be built in either (or one) side of the gear, the gear is leaking internally and must be disassembled and repaired.
8. Shut the engine off, remove the testing gage, reconnect the pressure hose, check the fluid level and make the needed repairs.
9. If the problem still exists, the steering and front suspension must be thoroughly examined.