DAF CF65, CF75, CF85 Series . Manual — part 953

©

200423

3-5

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

Items requiring special attention when
connecting the test case
1.

Clean the delivery line connection that is

going to be disconnected.

2.

Check the steering box attachment.

3.

Check the hydraulic central position.

4.

Place proper turning plates under the

vehicle's steerable wheels.

Block the vehicle so that it cannot

slide off the jack or the turning

plates.

5.

With an EMAS-controlled trailing axle

remove the fuses from the EMAS system.

Connecting the test case
1.

Check whether the non-return valve (5) of

the 'Servotest 550' is completely closed, the

cock (4) has been fully opened and the

pressure adjusting device (6) of the

pressure-limiting valve is set in accordance

with the maximum system pressure.

Only use couplings and lines which

are suited to the maximum system

pressure.

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STEERING GEAR, GENERAL

3-6

©

200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

2.

Connect the test case to the delivery line.

Make sure that as little steering oil as

possible runs off. Collect the steering oil

leaking out of the system.

Connect the hose from the "Eingang"

connection of the test case to the part of the

line coming from the main steering pump.

Connect the hose from the "Ausgang"

connection of the test case to the part of the

line going to the steering box.

Note:

If internal leakage needs to be measured in the

steering box on an EMAS-controlled trailing axle,

the test case should be connected between the

EMAS fluid flow control valve and the steering

box.

3.

Place the hose coming from the "Tank"

connection into the reservoir. Attach this line

to the reservoir and make sure that the end

of the line stays below the oil surface (to

prevent the forming of foam).

4.

Check the steering oil level and top up as

necessary.

5.

Start the engine and keep an eye on the

steering oil level.

Bringing the steering oil up to the test
temperature
1.

Bleed the system by running the engine at

idling speed for 2 minutes. Check the

steering oil level at regular intervals, and top

up as necessary. Do not touch the steering

wheel during these 2 minutes.

2.

Run the engine at idling speed.

3.

Slowly close the cock (4), until the pressure

gauge (10) reads a pressure of 50 bar.

4.

Wait until the thermometer (11) reads a

value of 50

C.

5.

Now open the cock (4) completely.

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©

200423

3-7

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

Inspection of steering gear using the

test case

Note:

-

During the measurements, the steering oil

temperature should be checked regularly

and, if required, the oil should be warmed as

specified.

-

If during the measurements a deviating value

is found, the cause of this deviation should

be traced and rectified first, before

continuing with the next measurement.

Measuring the circulation pressure
1.

Run the engine at idling speed.

2.

Open the cock (4) completely.

3.

The circulation pressure is indicated by the

pressure gauge (9). Compare the reading

with the maximum value allowed. See

'Technical data'.

Inspection of front axle bearings
1.

Run the engine at idling speed.

2.

Check whether the cock (4) is fully opened.

3.

Turn the steering gear carefully from the

central position to both maximum wheel

deflections.

4.

Check whether the necessary pressure rises

evenly.

Testing the maximum system pressure
1.

Run the engine at idling speed.

2.

Activate the steering gear and fit a 15-mm

filler piece, special tool (DAF no. 0535996),

between the adjusting bolt and the axle stop.

Be careful when fitting the 15-mm

filler piece between the adjusting

bolt and the axle stop, because there

is a danger of limbs getting trapped.

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STEERING GEAR, GENERAL

3-8

©

200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

3.

Fit a torque wrench with a dial to the steering

wheel nut and tighten the nut to a tightening

torque of 45 Nm on the torque wrench.

4.

Read the pressure given by the gauge (10)

(hold maximum pressure for no longer than

5 seconds) and compare the measured

value with the value specified, see 'Technical

data'.

5.

Repeat the measurement using the 15-mm

filler piece at the other side of the front axle.

Testing the final limiting pressure
1.

Turn the steering gear to maximum lock.

2.

Set the engine speed to 1200 - 1400 rpm.

3.

Fit a torque wrench with a dial to the steering

wheel nut and tighten the nut to a tightening

torque of 45 Nm on the torque wrench.

4.

The pressure gauge (10) will indicate the

final limiting pressure.

5.

Compare the reading with the specified

value, see 'Technical data'.

6.

Carry out the measurement at the other side

of the axle as well.

Testing the maximum pump pressure
1.

Check whether the pressure-limiting valve

(6) is set at the correct pressure.

2.

While the engine is at idling speed, slowly

close the cock (4) until the maximum

pressure is achieved at gauge (10). This

maximum pressure should be maintained for

5 seconds at the most. Otherwise the

internal pump components will become too

hot. This would result in premature wearing

of the pump.

If the pressure-limiting valve (6) is set lower

than the system pressure, the maximum

system pressure will not be reached.

45Nm

45Nm

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45Nm

45Nm

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