B3ED0CK1 - 206

CHECK POWER STEERING PRESSURES

1 - SPECIAL TOOLS

Kit (-).0710-ZZ comprising :

• [1] pressure gauge
• [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
• [6] union SAGINAW M16 X 150 (-).0710-G
• [7] union SAGINAW M16 X 150 (-).0710-EZ
• [8] valve sealing checking plugs ((-).0710-H)

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

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

Drain the power steering fluid reservoir using a clean syringe .

Unscrew the pipe (1) using the tool [9] .

Remove the bolt (2) .

Move aside the pipe (1) .

Fit the unions [6] and [7] .

Tighten the union(s) [6] to 2 daN.m .

Connect the pressure gauge [1] .

The tap [5] makes it possible to close the supply to the valve .

FILL AND BLEED THE HYDRAULIC CIRCUIT USING FRESH FLUID .

Check there are no leaks .

3 - POWER STEERING PUMP PRESSURE

Close the tap [5] for 15 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

Disconnect from the valve the two ram supply pipes .

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

Top up the oil .

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

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 torque(s) :

• high pressure union on the pump : 2 da.Nm
• fastener which secures the ram supply pipe to the valve or to the ram : 0.8 da.Nm

BLEED THE HYDRAULIC CIRCUIT .

IMPERATIVE : check that the seals are present at the end of the valve-ram supply pipes .