3
GEARBOX - PNEUMATIC SECTION
General CF65/75/85 series
1-22
When the gearbox is in neutral, the air supply is
connected via connection point 21 of the neutral
position valve (1) to connections 1 and 21 of the
downshift protection valve (3). If the GP switch
(5) is moved to the high (H) position, the
range-change gear engaging cylinder (2) is
ventilated via connection 25, causing the
range-change gear engaging cylinder to be
moved to the high (H) position. The
range-change gear engaging cylinder (2) is bled
through connection point 26 and connection
point 22 of the downshift protection valve (3).
If the GP switch (5) is moved to the low (L)
position, the range-change gear engaging
cylinder (2) is ventilated via connection 26,
causing the range-change gear engaging
cylinder to be moved to the low (L) position.
If the vehicle speed is lower than a certain value,
the electronic unit (4) will supply voltage to the
electropneumatic valve (6) of the downshift
protection. This causes the electropneumatic
valve to move to a different position. The air
supply of the GP switch (5) is now connected to
the pneumatic valve (3).
It is now possible to switch the pneumatic
command from the gear lever range-change
switch (5) by means of connection point 26 of
the engaging cylinder (2) and hence to shift to
the low range.
4
ᓻ 200337
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