DAF CF65, CF75, CF85 Series . Manual - part 1194

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EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ85 series

5

3.20 CHECKING THE STEERING OIL LEVEL

1.

Check the steering oil level when the engine 
is not running.

2.

Clean the dipstick and its immediate 
surroundings to prevent any oil from entering 
the reservoir.

3.

Check the fluid level in the reservoir using 
the dipstick.

4.

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.

3.21 CHECKING THE STEERING GEAR LINES AND CONNECTIONS

1.

Condition of the pipes
-

Check all pipes for tightness and wear. 
Where supply pipes are subject to 
negative pressure, it is particularly likely 
that porous pipes will give rise to 
problems (air in the system).

-

If in doubt, always replace the line. 

2.

Pipe connections
-

Check every pipe connection for leaks.

3.

Line route
-

Pipes must not be twisted during 
assembly. To facilitate checking this, a 
mark may have been provided on the 
hose (sometimes in the form of text).

-

Pipes should not touch other parts (to 
prevent chafing).

-

The course pipes follow should not 
include any sharp bends; this applies 
especially to the flexible suction and 
return pipes.

-

Pipes should not be pinched off by other 
components.

S7 00 676

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

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Inspection and adjustment

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ΧΦ85 series

3.22 INSPECTING THE COMPRESSOR LINE

Remain at a safe distance from 
rotating and/or moving components.

Note:
If excessive values are measured, the inside of 
the air-dryer housing and the silencer on the vent 
should first be cleaned. Then repeat the 
inspection.

1.

Bring the engine up to operating 
temperature. 

2.

Bleed the system to a pressure below the 
cut-in pressure of the pressure regulator.

3.

Remove compressor control line (1) which is 
hooked up to connection point 23 of the air 
dryer. Then seal the opening at connection 
point 23.

4.

Build up pressure in the brake system 
(pressure regulator must cut out).

5.

When the engine is not running, remove the 
safety valve from the compressor line and 
replace it with a test nipple.

6.

Connect a pressure gauge (measuring range 
0-16 bar) to the test nipple.

7.

Start the engine and run it at maximum 
speed.

}

R600521

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EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

ΧΦ85 series

5

8.

The pressure gauge should indicate a 
pressure below 2 bar with the pressure 
regulator switched off. If the measured 
pressure exceeds the value indicated, the 
compressor line should be cleaned or 
replaced.

Note:
If the pressure measured is too high, there is 
excessive carbon deposit in the compressor 
line. This may be due to the poor condition of 
the compressor (oil consumption).

9.

Run the engine at idling speed.

10. Bleed the brake system until the cut-in 

pressure of the pressure regulator has been 
reached and switch off the engine. The 
needle of the pressure gauge may not drop 
too quickly now. If necessary, check the 
system for air leakage. Pay particular 
attention to the compressor line and 
compressor.

11. Fit the safety valve.

12. Connect the compressor control line to 

connection point 23 of the air dryer.

R600249

EXPLANATORY NOTES ON THE MAINTENANCE ACTIVITIES

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Inspection and adjustment

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ΧΦ85 series

3.23 CHECKING THE BRAKE COMPONENTS AND BRAKE SYSTEM FOR LEAKS

1.

While operating the service brake, check 
whether any leaks occur in the brake system.
If the brake system of a vehicle has been 
charged to the maximum pressure, it should 
generally be possible to drive the vehicle 
after a period of 16 hours of uninterrupted 
standstill, without having to first charge the 
brake system to adequate operating 
pressure. This implies a maximum pressure 
drop of approx. 0.4 bar per hour at normal 
system pressure. 

Note:
Always connect auxiliary consumers and 
accessories to circuit 4.