Connecting and disconnecting testing unit

AR46.20-W-3055H

Connecting and disconnecting testing unit

15.12.2016

Model

963, 964

Modification notes

02.11.2016

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths, added.

AH00.00-P-0015-01CW

Connection scheme

1

Test line (oil pressure from power steering pump (3))

2

Test line (oil pressure to steering gear (5))

3

Power steering pump

4

Tester

5

Steering gear

6

Oil reservoir

a

Oil pressure line

b

Oil return line

c

Oil suction line

 Danger !

Risk of injury to skin or eyes from hot hydraulic fluid spraying out under high pressure. Risk of burn injuries from contact with components heated by hot hydraulic fluid. Risk of poisoning from swallowing hydraulic fluid

Do not make any technical modifications to the pressure gauge or the test equipment. Check the pressure gauge and test equipment for mechanical damage each time prior to use. Observe the flow diagram when connecting the test equipment. Wear protective gloves, protective clothing and safety glasses.

AS46.00-Z-0003-01A

 Danger !

Risk of injury caused by body parts being pinched or crushed as cab is tilted

Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure with the safety strut.

AS60.80-Z-0001-01A



Notes on maintenance and repair work

AH46.20-N-0001-01H



Notes on handling test equipment for testing delivery rate and oil pressure of power steering pump

AH46.30-N-0001-01A



Notes on tilting the cab

AH60.80-N-0003-01A



Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Install

1

Open maintenance flap

2

Tilt cab

3

Attach test lines (1, 2) to test equipment (4)

If necessary.

 Steering test equipment

*765589012100

4

Disconnect oil pressure line between power steering pump (3) and steering gear (5) at a suitable connection

 Model 963 to 28.02.15, 964 to 28.02.15 with code A4B (Leading axle, 7.5 t, steered, load-relievable), code A4Q (Trailing axle, 9 t, steered, load-relievable, liftable), code A4R (Trailing axle, 9 t, steered, load-relievable), code A4T (Trailing axle, 8 t, steered, load-relievable, liftable), code A4U (Trailing axle, 8 t, steered, load-relievable), code A4X (Trailing axle, 7.5 t, steered, load-relievable) or code A4Y (Trailing axle, 7.5 t, steered, load-relievable, liftable)
Disconnect oil pressure line between power steering pump (3) and flow dividing valve. If the test equipment is connected between the flow dividing valve and steering gear (5), this will lead to false measurement results, because only the volumetric flow rate metered for the steering gear (5) will be measured, and not the full delivery rate of the power steering pump (3).

 Collect escaping oil in a suitable container.

5

Connect test line (1) to power steering pump (3) and test line (2) to steering gear (5)

 Union nut, steering gear oil line/hose

*BA46.25-N-1001-04B

6

Turn control wheel on test equipment (4) counterclockwise as far as it will go

 This ensures that the valve in the test equipment (4) is fully open.

7

Connect test equipment (4) to battery

 The test equipment (4) is designed for 12-V and 24-V operation.

8

Switch on test equipment (4) and wait until self-test has been completed

 During the self-test, all segments in the display of the test equipment (4) are actuated briefly. After the self-test, all three green LEDs in the display must be lit. If this is not the case, there is a fault in test equipment (4). See the operating instructions of the test equipment (4).

9

Fill up steering gear oil and bleed

AR46.25-W-3001H

 Bleed the steering until the values in the display of test equipment (4) fluctuate by max. 1 bar or 1 l/min.
Leave vehicle jacked up after bleeding. When tilting back the cab, make sure that the test lines (1, 2) are not pinched.

Detach

10

Tilt cab

11

Check oil temperature of steering

 Switch on the test equipment (4) briefly if necessary.

If the oil temperature is higher than 40 °C.



Wait until oil temperature drops below 40 °C.

12

Detach test lines (1, 2) from vehicle and seal them off

 Collect escaping oil in a suitable container.

13

Connect oil pressure line between power steering pump (3) and steering gear (5) at connection

 Union nut, steering gear oil line/hose

*BA46.25-N-1001-04B

14

Disconnect test equipment (4) from battery

15

Detach test lines (1, 2) from test equipment (4)

If necessary.

16

Fill up steering gear oil and bleed

AR46.25-W-3001H

 Do not yet tilt back the cab.

17

Check steering for leaks

 Visual inspection.

18

Lower cab

19

Close maintenance flap

 Hydraulic lines

Number

Designation

Model 963, 964

BA46.25-N-1001-04B

Union nut, steering gear oil line/hose

Line Ø 12 mm

Nm

50

Line Ø 15 mm

Nm

60