Check and adjust hydraulic limiter

AR46.25-G-3090C

Check and adjust hydraulic limiter

15.2.12



Checking

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

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

AS00.00-Z-0005-01A

1

Raise front axle and lower onto jack stands

 The wheels must turn freely.

2

Remove screw plug with retaining chain from test connection (arrow)

 Detach retaining chain from test connection (arrow) completely so that the test hose can open the check valve.

3

Attach pressure gauge and test hose



*437589002100



*437589009000

4

Start engine and run at high idle speed

 Oil temperature in steering system
approx. 50 °C.

5

Turn steering to left and right lock

 When correctly adjusted, there is a pressure drop at each lock position (cut-off pressure). If the values are not attained:

*BE46.20-N-1001-01A

Adjust hydraulic limiter

6

Turn off engine

Adjust

7

Remove locking plate of limiter adjusting screws (1, 2)

8

Screw left limiter adjusting screw (2) all the way in and then unscrew by 2 to 3 turns

 The limiter adjustment screws (1, 2) are under pressure.

For safety reasons the limiter adjusting screws (1, 2) must not be unscrewed from the steering housing more than 2 to 3 turns when the engine is running.

 Screw in the left limiter adjusting screw (2) until the head of the left limiter adjusting screw (2) abuts the steering gear housing.

9

Start engine and run at high idle speed

 Oil temperature in the steering system

approx. 50 °C.

10

Turn steering to left lock

11

Screw the left limiter adjusting screw (2) in slowly until the adjusting pressure is reached

 Screw in the left limiter adjusting screw (2) until the pressure drops due to the servo effect setting in

*BE46.20-N-1001-01A

12

Read off test pressure on pressure gauge

*BE46.20-N-1001-01A



*437589002100

 If the values are not attained:



Remove / install hydraulic limiter

AR46.25-G-3100C

13

Adjust right limiter adjusting screw (1) for right wheel lock in the same way as for left wheel lock

 Perform steps 8 to 12.

14

Turn off engine

15

Detach pressure gauge and test hose



*437589002100



*437589009000

16

Install locking plate of limiter adjusting screws (1, 2)



*BA46.20-N-1005-01G

17

Attach screw plug with retaining chain to the test connection (arrow)



*BA46.20-N-1004-01G

18

Conduct a road test

 Check the overall steering behavior of the vehicle.

Number

Designation

Steering
765.863 in model 427, 436, 437

BA46.20-N-1004-01G

Test connection screw plug to steering gear

Nm

18

BA46.20-N-1005-01G

Retainer for pressure reduction valves to steering gear

Nm

10

Number

Designation

Steering 765.863

BE46.20-N-1001-01A

Adjustment pressure of pressure reduction valves

-

bar

50 (-10)

Engine speed

rpm

1400 to 1500