CLUTCH
3-2
©
200508
Description of components
9
ΛΦ45/55 series
3
Air pressure now flows into the cylinder.
The pressure pin (4) is pushed forward by the air
pressure building up on air piston (5) and the
hydraulic pressure on fluid piston (6).
The pressure pin (4) pushes against the clutch
lever, which results in declutching.
State of equilibrium
When the hydraulic pressure and pneumatic
support push the pressure pin (4) forwards, a
state of equilibrium is achieved between the air
pressure and the hydraulic pressure (status when
the clutch pedal is not depressed any further).
The servo piston (1) again seals off against the
valve seat, closing the air supply and stopping the
build-up of pneumatic pressure.
Clutching
When the clutch pedal is released, there is no
longer any hydraulic pressure and the servo
piston (1) will be pushed back into its original
position by pressure spring (7) and any remaining
pneumatic support.
As a result, the bleed bore (8) in the servo piston
(1) is no longer closed, and venting takes place
via bleed vent (9).
Vent opening
The function of the vent opening (10) is to prevent
a build up of pressure between both piston seals.
DAF LF Gearboxes and Clutch Service Manual
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