DAF CF65, CF75, CF85 Series . Manual — part 1066

©

200424

3-3

Inspection and adjustment

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

9

5.

Turn the adjusting bolt (1) using an Allen key.

During the adjusting process the trailing axle

should not be activated.

-

Screwing the bolt in will increase the

pressure.

-

Unscrewing the bolt will decrease the

pressure.

Turn the adjusting bolt (1) using small steps

of not more than 20

. Measure the pressure

after each step.

Note:

As the pressure increases very rapidly, a

large turn of the adjusting bolt can result in

excessive system pressure causing

damage.

6.

Lift the trailing axle and take the pressure

reading. Release the control switch on the

dashboard immediately once the maximum

pressure is achieved.

If the pressure exceeds 200 bar, the control

switch on the dashboard should be released

immediately.

7.

If the measured value is still incorrect:

connect the pressure-switch connector

and lower the trailing axle.

8.

Turn the adjusting bolt (1) once again.

9.

Remove the pressure switch connector.

10. Wait for approx. 2.5 minutes and take a new

reading. If necessary, repeat points 7 to 10

until the pressure setting is correct.

11. Tighten lock nut (2). Make sure that the

adjusting bolt (1) does not turn too.

12. Connect the connector of the pressure

switch, lower the trailing axle and check the

pressure again.

13. Remove the T-piece and pressure gauge.

14. Check the oil level in the reservoir and top up

if necessary.

1

2

3

A8 00 279

1

2

3

A8 00 279

HYDRAULIC LIFTING GEAR

3-4

©

200424

Inspection and adjustment

9

ΧΦ65/75/85 series

8

3.3 CHECKING INTERNAL LEAKAGE IN THE PUMP UNIT

1.

Check the setting of the pressure relief valve

before conducting this test.

2.

Lower the trailing axle. The wheels of the

trailing axle must rest on the ground.

3.

Clean pipe connection B of the pump unit.

4.

Remove the pipe from pipe connection B and

plug the pipe.

5.

Connect the pressure gauge, special tool

(DAF no. 0535653), to pipe connection B so

that the pipe connection is also plugged.

6.

Put the control switch into the "lifting"

position. The pressure will quickly increase

and the pressure switch will deactivate the

pump motor. Release the control switch.

7.

Take the pressure reading and check the

outward leakage. Leave the pump unit in

pressurised condition, also depending on the

complaint (how quickly the trailing axle will

be lowered by itself). If the pressure

decreases, the non-return valve in the 2/2

solenoid valve or the gasket of the 2/2

solenoid valve is leaking.

8.

Activate the 2/2 solenoid valve manually

after the test using a 24V power supply. The

2/2 solenoid valve will be activated,

rendering pipe connection B of the pump unit

pressureless.

9.

Remove the pressure gauge and reconnect

the piping.

10. Activate the lifting gear and check the oil

level in the reservoir. Inspect the pipe

connections for leaks.

B

A

A8 00 281

©

200424

3-5

Inspection and adjustment

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

9

3.4 BLEEDING OF THE HYDRAULIC LIFTING GEAR

The lifting gear is bled automatically. If

necessary, lift and lower the trailing axle several

times in a row.

The oil level in the reservoir should not fall below

the minimum level.

Note: after lowering the trailing axle, wait approx.

2.5 minutes before lifting the trailing axle.

If the switch is activated before this time span of

approx. 2.5 minutes elapses, the time will be

reset and you will have to wait about another

2.5 minutes before you can lift the trailing axle.

3.5 CHECKING THE FLUID LEVEL IN THE HYDRAULIC LIFTING GEAR

1.

Make sure that the trailing axle wheels are

fully lowered and on the ground.

2.

Check the fluid level. The liquid level must be

between the "min." and "max." level mark. If

necessary, top up.

HYDRAULIC LIFTING GEAR

3-6

©

200424

Inspection and adjustment

9

ΧΦ65/75/85 series

8

3.6 CHECKING THE CYLINDER

1.

After cylinder disassembly and assembly the

cylinder should be checked for internal and

external damage. See "Disassembly and

assembly".

2.

Pull the entire length of the piston rod out of

the cylinder.

3.

Connect a test pump with pressure gauge to

pipe connection B. Both pump and pressure

gauge should be able to handle a minimum

pressure of 220 bar.

4.

Increase the pressure to the prescribed test

pressure, see "Technical data" and leave the

cylinder pressurised for some time.

Never stand in front of the piston rod when

increasing the pressure. If the spring clip (6)

is not installed correctly, the piston rod could

come out of the cylinder.

5.

Check the cylinder for internal and external

leakage.

6.

Push the piston rod completely into the

cylinder and plug the pipe connections after

completion of the test.

1 2

1

2

11 12

13 14 15 16 17 18

3 4 5 6

8 9

A

B

10

7

A8 00 248

B

A

A8 00 281