Kalmar DRD450-80S4X, Maintenance Manual

Page: 90 / 600

UDRF01.04GB
Maintenance manual DRF 400–450
6 2 Transmission – 2.3 Mechanical transmission
2.3 Mechanical transmission
page –
Mechanical transmission, description
The transmission is built with all gears in constant mesh. It is shifted
through hydraulic pressurizing of clutch discs for each one of the
gears. The clutch discs connect the input shaft with the main shaft
or tubular shaft, depending on which gear has been selected. Shift-
ing takes place without disengaging the transmission from the en-
gine.
The clutches for FORWARD and REVERSE are modulated electro-hy-
draulically, which means that the clutch pressure builds up gradual-
ly. This allows shifting between FORWARD and REVERSE, and vice
versa, while operating at a speed lower than set limit value, see sec-
tion
8 Control system , group 8.5.1.5 DRIVETRAIN . Modulation also
gives smooth shifting between FORWARD and REVERSE.
High modulation (that is, soft operation/intensive slipping between
gear positions) results in high transmission wear and high oil tem-
perature. The sensor for oil temperature generates a warning when
the oil gets warmer than 120
°
C. If the oil temperature sensor indi-
cates 125
°
C, the transmission’s function ceases.
There are four gears in each direction for the transmission. A clutch
(disengagement) function is operated with a separate clutch pedal
that starts to function at a certain brake pressure.
The electric shifting system is either manual or automatic.
For position of components see Transmission, component position
page 4 .
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