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.

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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