B3ED0CK1 - 607

CHECK POWER STEERING PRESSURES

1 - SPECIAL TOOLS

Kit (-).0710-ZY comprising :

• [1] pressure gauge (-).0710-A
• [2] checking hose(s) from pressure gauge to tap (-).0710-B1
• [3] high pressure checking hoses to tap (-).0710-B2
• [4] high pressure pump checking hoses to tap (-).0710-B3
• [5] three way tap (-).0710-C
• [6] union SAGINAW M16 X 150 (-).0710-G
• [7] union SAGINAW M16 X 150 (-).0710-E2Z
• [8] valve sealing checking plugs ((-).0710-H)

[9] High pressure union socket (-).0720-F .

2 - PRELIMINARY OPERATIONS

WARNING : carry out the operation with care in order to prevent the entry of contaminating particles .

NOTE : correct operation of the equipment requires absolute cleanness of the fluid and the hydraulic components .

Check :

• the belt tension
• the condition of the pipes and unions

Prepare the checking assembly [1], [2], [3], [4], [5], [6], [7] .

Finger-tighten the connectors (without tightening) .

Hook on the tool [1] .

Remove the bolt (1) .

Unscrew the high pressure pipe (2) using the tool [9] .

Move aside the high pressure pipes (2) .

Screw the union [6] onto the pump .

Screw the union [7] onto the pipe (2) .

Tighten all the unions .

Union [6] : Tightening torques, 2 da.Nm .

Fill the power steering reservoir 10 to mm above the maximum mark .

Open the tap [5] .

Start the engine (5 second(s)) .

Stop the engine .

Check :

• the level
• that there are no leaks

Start the engine .

FILL AND BLEED THE HYDRAULIC CIRCUIT USING FRESH FLUID .

3 - POWER STEERING PUMP PRESSURE

Start the engine .

Close the tap [5] for 7 seconds .

At fast idle (1200 to 1500 revs/min), the pressure must be : 100 ± 5 bar(s) .

Power steering pump pressure low :

• replace the hydraulic pump

Power steering pump pressure correct :

• check the sealing of the valve

4 - CHECKING THE SEALING OF THE VALVE

Remove the shield under the power train .

Remove the two bolts (3) securing the steering heat shield .

Move aside the steering heat shield .

Unscrew the unions (4) on the steering ram .

Disconnect from the valve the two supply pipes (5) for the ram, and move them aside .

Fit the 2 caps on the valve [8], Tightening torque 0,8 da.Nm .

Turn the steering slowly from lock to lock to drain the ram .

Top up the oil .

Open the tap [5] .

Start the engine .

Maintain the engine speed at fast idle .

Maintain the wheels at full lock to one side then the other .

The pressure should adjust to : 100 ± 5 bar(s) .

The pressure is correct :

• replace the steering mechanism

The pressure is below the values above :

• replace the distribution valve

Rectify the circuit .

Tightening torques :

• high pressure union on the pump : 2 da.Nm
• fastener (5) which secures the ram supply pipe to the valve or to the ram : 0,8 da.Nm

BLEED THE HYDRAULIC CIRCUIT .