DAF CF65, CF75, CF85 Series . Manual - part 956

©

 200423

4-3

Draining and filling

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

7.

Jack up the steerable axle(s) until the wheels 

are clear of the floor.

Note:

If the wheel deflection limiting valves are 

incorrectly set, e.g. because the maximum 

wheel deflection is increased, these valves 

should be set correct first.

8.

Start the engine and, with the engine 

running, slowly turn the steering wheel 

(approx. a 

∂ turn of the steering wheel per 

second) to the left and to the right, until the 

maximum wheel deflection is reached. 

Continue this until the oil level no longer 

decreases.

Watch the steering oil level, especially if the 

vehicle is equipped with a slave cylinder.

9.

Run the engine at idling speed for another 2 

minutes. Do not touch the steering wheel 

during these 2 minutes.

10. Check the steering oil level when the engine 

is not running.

11. Clean the dipstick and its immediate 

surroundings so that no dirt can get into the 

reservoir.

12. Check the fluid level in the reservoir using 

the dipstick.

13. The fluid level should be between the marks 

when the steering oil is "cold".

Note:

When the steering oil is at operating temperature, 

the level may be above the top mark on the 

dipstick.

Note:

If the vehicle is equipped with a slave cylinder, it 

may be necessary in some cases to bleed the 

slave cylinder separately.

To do so, slightly loosen the union nuts of both 

connections while the engine is running, and no 

steering action is taking place. Any air can now 

escape.

14. Put the filler cap on the reservoir again and 

lower the axle(s).

15. Inspect the line connections for leaks.

16. Make a test drive. Now check the steering oil 

level and check the line connections for 

leaks.

S7 00 676

STEERING GEAR, GENERAL

4-4

©

 200423

Draining and filling

2

ΧΦ65/75/85 series

7

4.2 DRAINING AND FILLING/BLEEDING THE DUAL-CIRCUIT SYSTEM

The steering oil should be drained in case of:

-

damage to the main steering pump or 

emergency steering pump

-

contamination of the steering oil

-

water in the steering oil

-

serious foaming of the steering oil due to 

drawing in of air.

Draining a dual-circuit steering system
1.

Clean the line connections of the steering 

box, the reservoirs, the emergency steering 

pump and, if present, the slave cylinder.

2.

Jack up the steerable axle(s).

3.

Place receptacles under the reservoirs, the 

steering box, the emergency steering pump 

and, if present, the slave cylinder. Remove 

the lines (for the reservoirs only the 

connection line).

4.

Remove the filters from the reservoirs.

5.

With the engine at a standstill turn the 

steering wheel slowly from one end stop to 

the other until the oil stops coming out of the 

line connections of the steering box and the 

slave cylinder.

6.

Reinstall the lines which were disconnected.

7.

Fit new filters into the reservoirs.

©

 200423

4-5

Draining and filling

STEERING GEAR, GENERAL

ΧΦ65/75/85 series

7

2

Drained steering oil must not be re-

used. Store this hydraulic oil 

separately from the other drained 

oils and have the oil collected by a 

waste removal company authorised 

to do so.

Make sure that during filling and 

bleeding the reservoir always 

remains filled with oil so as to 

prevent the pump from drawing in air 

which would cause foaming in the 

oil.

Air in the hydraulic system may 

cause serious damage to the 

steering pump. Air in the hydraulic 

system could cause occasional 

"jamming" of the steering gear.

If the hydraulic system contains air, 

a squealing sound will be heard 

when the steering wheel is turned.

In the case of serious foaming, the 

steering oil should be completely 

drained. Trace and repair the leak, 

after which the system can be filled 

again and bled.

Filling/bleeding the dual-circuit steering 
system
1.

The steering boxes are equipped with an 

automatic bleeding system. This bleeding 

system will only function if there is circulation 

pressure in the system.

2.

Disconnect the propeller shaft from the 

gearbox.

Hang the propeller shaft properly to 

one side so that it cannot come into 

contact with the gearbox flange.

If the bolts cannot be removed from 

the gearbox flange, these should be 

provided with spacer sleeves and 

nuts. Tighten the nuts carefully, so 

that the bolts can no longer come 

into contact with the gearbox 

housing.

3.

Fill both reservoirs to the rim with clean oil 

which complies with the specifications. Wait 

a little while and then fill the reservoirs to the 

brim again.

}

}

STEERING GEAR, GENERAL

4-6

©

 200423

Draining and filling

2

ΧΦ65/75/85 series

7

4.

Loosen the line connection of the supply line 

on the emergency steering pump. Bleed the 

supply pipe.

Tighten the line connection.

5.

Top up the reservoirs again.

6.

Crank the engine for approx. 2 seconds 

using the starter motor. Make sure that the 

reservoir remains filled. Stop cranking 

immediately if the oil level threatens to 

become too low. Top up the steering oil.

7.

Crank the engine for approx. 10 seconds 

using the starter motor. Make sure that the 

reservoir remains filled. Stop cranking 

immediately if the oil level threatens to 

become too low.

8.

Top up the steering oil to the upper mark on 

the dipstick.

9.

Repeat the actions described in points 6 and 

7 until the steering oil level no longer 

decreases.

10. Jack up the steerable axle(s) until the wheels 

are clear of the floor.

Note:

If the wheel deflection limiting valves are 

incorrectly set, e.g. because the maximum 

wheel deflection is increased, these valves 

should be set correct first.

11. Start the engine and, with the engine 

running, slowly turn the steering wheel 

(approx. a 

∂ turn of the steering wheel per 

second) to the left and to the right, until the 

maximum wheel deflection is reached. 

Continue this until the oil level no longer 

decreases.

Watch the steering oil level, especially if the 

vehicle is equipped with a slave cylinder.

12. Check the steering oil level when the engine 

is running and, if necessary, top up to the 

upper mark on the dipstick.

13. Change into a low gear and slowly release 

the clutch pedal while the engine is at idling 

speed. Watch the steering oil level in the 

reservoir of circuit 2. Top up if the level 

becomes too low.

14. Change into a higher gear and increase the 

engine speed if the steering oil level no 

longer decreases.

The warning indicator of circuit 2 should now 

go off.

S7 00 722