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

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Inspection and adjustment

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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Inspection and adjustment

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.