DAF CF65, CF75, CF85 Series . Manual - part 952

 

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DAF CF65, CF75, CF85 Series . Manual - part 952

 

 

©

 200423

3-1

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

3. INSPECTION AND ADJUSTMENT

3.1 INSPECTION OF THE STEERING GEAR USING A PRESSURE GAUGE

Note:

A quick check of the steering gear can be carried 

out using a pressure gauge. To this end, the 

same pressure gauge can be used as for the 

adjustment of the wheel deflection limiting valves.

A pressure gauge allows you to carry out only a 

limited number of measurements. To test the 

steering pump (output in l/min. at a certain 

pressure) and the steering box condition (internal 

sealing, plays) you will need a test equipment 

case.

If the cause of the problem cannot be found using 

the pressure gauge, the steering gear should be 

diagnosed using the test case.

After having turned the steering 

wheel with a torque wrench with a 

dial, always check the tightening 

torque of the steering wheel nut.

Items requiring special attention when 
connecting the pressure gauge
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.

}

}

STEERING GEAR, GENERAL

3-2

©

 200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

Connecting the pressure gauge

Only use couplings and lines which 

are suited to the maximum system 

pressure.

1.

Connect the pressure gauge, using special 

tool (DAF no. 0535653) to the T-piece in the 

delivery line. Make sure that as little steering 

oil as possible runs off and clear away spilt 

oil.

2.

Check the steering oil level in the reservoir 

and top up if necessary.

3.

Bleed the steering gear, see chapter 

'Draining, filling and bleeding'.

Bringing the steering oil up to the test 
temperature
1.

Set the engine speed to 1200 - 1400 rpm.

2.

Activate the steering gear for 5 seconds at its 

maximum, making sure that the pressure 

does not exceed 50 bar. Do not touch the 

steering wheel for 5 seconds.

3.

Repeat this action until the lines are at least 

hand warm.

Measuring the circulation pressure
1.

Run the engine at idling speed.

2.

Check the circulation pressure. Compare the 

reading with the specified value, see 

'Technical data'.

Inspection of front axle bearings
1.

Run the engine at idling speed.

2.

Turn the steering gear carefully from the 

central position to both maximum wheel 

deflections.

3.

Check whether the control pressure rises 

evenly.

}

S7 00 585

©

 200423

3-3

Inspection and adjustment

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

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 or the axle stop on 

the swivel axle and the axle housing 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.

3.

Fit a torque wrench with a dial to the steering 

wheel attachment bolt. Tighten the nut to a 

tightening torque of 45 Nm on the torque 

wrench.

4.

Take the maximum pressure reading on the 

pressure gauge (the maximum pressure 

should not be continued for more than 5 

seconds). Compare the reading with the 

specified value, see 'Technical data'.

Note:

If the measured value deviates more than 10% 

from the specified value, the cause should be 

identified using the test case.

5.

Repeat the measurement using the 15-mm 

filler piece at the other side of the front axle.

6.

Retighten the steering wheel attachment bolt 

to the specified tightening torque. See 

'Technical data'.

7.

Remove the pressure gauge and 

the T-piece.

8.

Check the steering oil level in the reservoir 

and top up if necessary.

9.

Bleed the steering gear, see chapter 

'Draining, filling and bleeding'.

S7 00 598

45Nm

45Nm

S7 00 565

}

STEERING GEAR, GENERAL

3-4

©

 200423

Inspection and adjustment

2

ΧΦ65/75/85 series

7

3.2 INSPECTION OF STEERING GEAR USING THE TEST CASE

Note:

The test case makes it possible to:

-

inspect the condition of the entire steering 

gear on a regular basis.

-

make a reliable diagnosis if the steering gear 

does not function properly.

An inspection using a pressure gauge will only 

provide information on system pressures, which 

in some cases might be insufficient to find a 

defect. However, it provides no information on the 

condition of the steering pump (output) and the 

steering box (internal leakage). As a result, in 

practice steering pumps and steering boxes are 

often replaced unnecessarily.

Electronic test case 'Servotest 550'
The inspection referred to below is carried out 

using the 'Servotest 550' test case. It is also 

possible to inspect the steering gear using similar 

equipment able to perform the same 

measurements as the 'Servotest 550'.

The test case is connected to the delivery line, 

which runs from the steering pump to the steering 

box.

The line connection "Eingang" is fitted with a filter 

which, depending on the degree of impurity of the 

oil, should be regularly cleaned.

The 'Servotest 550' test case consists of the 

following parts:

50

100

150

200

250

5

10

15

20

25

  9

7
8

2

4

6

5

10
11

  1
  3

S7 00 020

1.

Connection "Eingang" (input)

2.

Connection "Ausgang" (output)

3.

Connection "Tank"

4.

Cock

5.

Non-return valve (throttle)

6.

Pressure-limiting valve 120/150 bar 

(switch over)

7.

Output meter 0.01 - 100 l/min

8.

Switch for output meter

9.

Low-pressure gauge 0-25 bar

10.

High-pressure gauge 0-250 bar

11.

Temperature gauge 0-120

C

 

 

 

 

 

 

 

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