Bleeding air from auxiliary steering circuit

AR46.80-W-0004B

Bleeding air from auxiliary steering circuit

3.2.14

MODEL

950.203/204 with REAR AXLE 749.109

with CODE AN9 (Hydraulically steered trailing axle)

Modification notes

27.1.14

Work procedure completely revised.

1

Return flow pipe

2

T-piece

3

Vent line

4

Valve unit

4.1

Test connection

4.2

Flow control valve

5

Control block

5.1

Test connection (centering circuit)

Pfeil

Bleed screw

 Danger !

Risk of death caused by vehicle slipping or toppling off during lifting

Only lift vehicle at the lift support points specified by the vehicle manufacturer.

AS00.00-Z-0032-01A

 Danger !

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating area of the mechanism when the components are moving.

AS00.00-Z-0009-01A

 Danger !

Risk of injury to skin or eyes from hydraulic fluid spraying out under pressure.Risk of poisoning from swallowing hydraulic fluid.

Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses.

AS00.00-Z-0013-01A

 Danger !

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A



Special instructions for lifting and supporting vehicle

AH00.60-N-0100-01B

Bleeding

1

Secure vehicle against rolling

2

Check whether the auxiliary steering has been activated

 To do this, switch on ignition, the indicator lamp in the EHZ [electronic-hydraulic auxiliary steering switch] (centering) must not light up.
If necessary, use the EHZ (centering) switch to activate the system and make the indicator lamp go out.
Switch off the ignition again.

3

Detach return line (1) from valve unit (4) on T-piece (2), add oil and fit return line (1) back onto T-piece (2)

Only when the power steering pump and/or the hydraulic lines are dry.

 To do so, release the T-piece (2), twist it upwards and add oil until the power steering pump and the hydraulic lines are full.

 Steering gear oil (ATF)

*BF46.80-N-1002-01A

4

Place front-axle wheels onto turntable or raise and jack up front axle

AR00.60-W-2000-01H

5

Bleed steering circuit (primary) of front axle at valve unit (4)

AR46.25-W-3300-01A

6

Place wheels for auxiliary steering axle onto turntable, lift or raise auxiliary steering axle then jack up

AR00.60-W-2000-01H

 According to vehicle load.

7

Bleed steering circuit (secondary) of auxiliary steering on control block (5)

AR46.80-W-0004-01A

8

Initialize steering angle sensors

AR46.80-W-1110A

 At the end of the teach-in process the ventilation status of the steering circuit for the auxiliary steering is checked. If ventilation is not OK, then the steering circuit (operation step 7) is bled again.

9

Raise front axle, remove turntable or jack stands and lower front axle

10

Raise auxiliary steering axle, remove turntable or jack stands and lower auxiliary steering axle

11

Check oil level in oil reservoir, correct if necessary

 Steering gear oil (ATF)

*BF46.80-N-1002-01A

12

Conduct a road test

 During the road test check the overall steering behavior of the vehicle.

 Rear axle auxiliary steering (HZL)

Number

Designation

MODEL 950 with Code AN8/AN9

BF46.80-N-1002-01A

Steering gear oil (ATF)

Filling capacity

Liter

10

Sheet

BB00.40-P-0236-02A

Sheet

BB00.40-P-0236-03A

Sheet

BB00.40-P-0236-06A

Sheet

BB00.40-P-0236-07A