Component Tests and General Diagnostics
Pressure Measurement Procedure
The measurement of the maximum system pressure, (which is governed by the pressure relief valve) is achieved by inserting Service Tool JD 10 (pressure gauge and adapters) into the fluid circuit of the power steering system. Run the engine at idle speed, turn the steering from lock to lock and read the maximum pressure recorded on the gauge.
Installing the Test Equipment
Assemble the test equipment as shown.
To connect into steering system:
^ Disconnect the power steering high pressure hose from the power steering pump to the steering gear.
^ Connect adapter 211-011-03/1 to the steering pump high pressure outlet.
^ Connect adapter 211-011-03/2 to the high pressure hose to the steering gear.
Pressure Test
Run the engine at idle speed and turn the steering until full lock is reached.
NOTE: Make sure the tap on the hydraulic test adapter, 211-01-01, is in the OPEN position to allow fluid flow in the system.
Continue to hold the steering at full lock against the lock stop, to ensure maximum working pressure, and read the pressure measurement on the gauge. System pressure should be between 102 - 110 bar, (1478 - 1594 psi).
If the system pressure is below the limit then either the steering gear or the steering pump is faulty. To determine whether the gear or the pump is faulty, carry out the following test:
^ Run the engine at idle speed.
^ Close the tap on the hydraulic test adapter, 211-01-01, to cut off fluid through the system.
^ Note the maximum pressure as the tap is closed.
^ Open the tap.
CAUTION: Make sure the tap is not closed for longer than 5 seconds, exceeding the limit may cause pump damage.
If the maximum pressure recorded is within limits, (102 - 110 bar (1478 - 1594 psi)), install a new steering gear.If the maximum pressure recorded is below the limit (102 bar (1478 psi), install a new power steering pump.
Removing the Test Equipment
To remove the test equipment reverse the installation procedure.
Install a new O-ring seal.