Bleed hydraulic system for auxiliary steering axle

AR46.80-W-1200A

Bleed hydraulic system for auxiliary steering axle

03.02.2014

MODEL

957.65

with CODE AN8 (Hydraulically steered leading axle)

MODEL

957.66

with CODE AN9 (Hydraulically steered trailing axle)

Modification notes

27.01.2014

Work procedure completely revised.

1

Steering cylinder

2

Vent hose (shop-made (tool))

3

Vent valves

Y67

Auxiliary steering axle hydraulic control block

4

Pressure relief valve (basic body)

5

Jam nut

6

Pressure screw

7

Oil dipstick

Y67

Auxiliary steering axle hydraulic control block

 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

 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 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

Bleeding

1

Make bleed hose (2) using a suitable piece of transparent hose and T-piece, then connect, as shown to the bleed valves (3) and the auxiliary steering axle hydraulic control block (Y67)

2

Connect diagnostic system and start XENTRY

3

Select auxiliary steering axle (ZL) system and perform venting process

 The procedure is menu-assisted.

If pressure relief is required:



Release jam nut (5) and unscrew pressure screw (6) by one or two turns.

To close the pressure unloading valve (4):



Screw in pressure screw (6) to specified tightening torque, then counterhold and tighten jam nut (5).

 Pressure screw and jam nut at pressure relief valve

*BA46.80-N-1011-01B

Turn auxiliary steering axle using XENTRY to left and right often enough (min. 3 times), until the oil escapes free of bubbles at the bleed valves (3). If the oil exits at the bleed valves (3) free of bubbles:



Close bleed valves (3) and detach bleed hose (2).

 Bleed valves to steering cylinder

*BA46.80-N-1016-01B

4

End XENTRY and disconnect diagnostic system

5

Check oil level and correct if necessary

 Switch drive switch for min. 15 s to "OFF" position.
The oil in a stopped engine must reach the "max." marking on the oil dipstick.

 Steering gear oil (ATF)

*BF46.80-N-1002-01A

 Auxiliary steering axle (ZL)

Number

Designation

MODEL 957 with CODE AN8, with CODE AN9

BA46.80-N-1011-01B

Pressure screw and jam nut at pressure relief valve

Nm

7

 Auxiliary steering axle (ZL)

Number

Designation

MODEL 957 with CODE AN8, with CODE AN9

BA46.80-N-1016-01B

Bleed valves to steering cylinder

Nm

59

 Rear axle auxiliary steering (HZL)

Number

Designation

MODEL 957 with CODEAN8/AN9

BF46.80-N-1002-01A

Steering gear oil (ATF)

Filling capacity

Liter

7

Sheet

-

Sheet

BB00.40-P-0236-03A

Sheet

BB00.40-P-0236-06A

Sheet

BB00.40-P-0236-07A